著者

滝口 克己 長嶋 俊雄 伊礼 朋次

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.59, no.466, pp.155-163, 1994

被引用文献数

5 5

---

This paper discusses the strength of a new SRC column. The SRC column is a small size steel encased reinforced concrete column using high strength concrete and high strength hoops. This SRC column is developed in order to have high shear earring capacity and ductitle performance. Seven SRC column specimens were provided and tested. The concrete section of the specimens was 20×20 cm, the steel section 100×50×5×7 mm. Each specimen was subjected to cyclic and reversal bending moment and shear force under constant axial force. Experimental results indicate that the new SRC column has adequate properties as expected.

著者

中村 尚弘

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.68, no.567, pp.63-70, 2003

被引用文献数

9 3

---

In order to perform time history earthquake response analyses in consideration of both the dynamic soil-structure interaction and the nonlinear behavior of the structure, it is important to transform the soil impedance in the frequency domain to an impulse response in the time domain. The author have studied the time domain evaluation of soil impedance, and proposed a transform method. In this paper, deeply embedded structures in the layered soil were investigated based on embedded SR model. The strong frequency dependent soil impedance was transformed to the impulse response, and earthquake response analyses were carried out in the time domain. The efficacy of the proposed method was confirmed through these studies.

著者

桑村 仁 松本 由香 武谷 政國

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.62, no.494, pp.129-136, 1997

被引用文献数

5 4

---

It has been pointed out in this decade that the currently used thick cold-formed box-section columns in building frames may fail in the mode of brittle fracture instead of local buckling, and that their ductility preceding brittle fracture may not be enough to resist a severe earthquake. In order to solve this problem, hot-rolled box-columns have been recently developed, in that the forming is done at high temperature to avoid cold working. In this study, the ultimate behaviors of the box-columns having through diaphragms, which is the current practice in building steel construction, were experimentally investigated. It was found that the newly developed hot-rolled box-columns exhibit much higher ductility than the conventional cold-rolled box-columns when the ultimate state is governed by brittle fracture as well as by local buckling.

著者

横山 裕 伊藤 仁洋 高橋 宏樹 小野 英哲

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.64, no.516, pp.37-44, 1999

被引用文献数

2 1

---

The purpose of this study is to present the lower criterion of C.S.R not to slip at the landing when people step on the slippery surface without the knowledge of the slipperiness changing. In this paper, first, it was made clear that the most dangerous motion was fast walking at the speed of one-point-two-two times the height per second. So, fast walking and walking at natural speed were selected as motions to be investigated. Secondly, from the investigation of the load applied to the floor while these motions, the load to be simulated by "Landing Slip Meter" was established.

著者

称原 良一 南 宏一

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.65, no.537, pp.135-140, 2000-11-30 (Released:2017-02-03)

参考文献数

3

被引用文献数

4 3

---

We've examined steel encased reinforced concrete buildings whose column bases were severely damaged due to 1995 Hyogo-ken Nanbu earthquake. We've deduced the tension force due to overturning moment has caused these damages through statistical analysis of the data. We've also proposed the models to estimate the shear coefficient C_B equivalent to the overturning strength of the building Those buildings which suffered severe damage at their column bases had C_B values less than 0.5 and/or had C_B value lower the shear coefficient C_O values which are estimated summing the shear strength of the columns and walls. Those buildings whose tensile strength of the column base overwhelms that of the column itself could also avoid the damage of the column base.

著者

日置 興一郎

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.67, no.557, pp.101-106, 2002-07-30 (Released:2017-02-04)

参考文献数

9

被引用文献数

1 1

---

To clarify the problem on the existence of many shear coefficients for Timoshenko's beam theory, the simple beam of rectangular section subjected to surface loading is analyzed by the two-dimensional elastic theory. The main results are as follows. The deflection expressed in terms of square of span is composed of not only shear deformation but also the other two deflections, which are different modes than that of shear excepting simple beams, i.e., bending deformation caused by perpendicular stress and deflection by perpendicular strain based on bending stress. By including these effects an improved deflection theory is proposed. It is made clear that Timoshenko's theory has two problems : indistinct definition of deflection and wrong inclusion of the other deformations than that caused by bending moment into the shear ones.

著者

下村 祥一 大熊 武司

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.72, no.621, pp.119-126, 2007-11-30 (Released:2017-02-25)

参考文献数

13

被引用文献数

1 1

---

It has been important to evaluate building's structural performance to wind action as much as earthquake. The aims of this study are to understand elasto-plastic wind response characteristics and propose elasto-plastic wind response analysis methods of detached timber-frameworked buildings. In this paper, at first, an analytical model of the building is shown, then wind force characteristics acting on small-scale and low-rise buildings and their simulation method are discussed. Next, pseudo-dynamic tests are carried out to timber-frameworked shear walls, then wind response characteristics obtained from the tests are described. Finally, analyses using the restoring force characteristics models that has been proposed by the authors are conducted and validities are considered by comparison with results of the pseudo-dynamic test.

著者

下村 祥一 大熊 武司

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.71, no.607, pp.133-140, 2006-09-30 (Released:2017-02-17)

参考文献数

11

被引用文献数

1 1

---

In this paper, two kinds of statically cyclic loading experiments are carried out in order to obtain the restoring force characteristics of timber framed shear walls for evaluation of wind resistance performance. The cyclic loading programs are made in consideration of features of wind forces. One of loading programs is carried out under displace control state and the other is carried out under load control state. The restoring force characteristics obtained from those experiments are modeled for response analyses. Although the basic idea of modeling is based on the combination of a normal bilinear model and a slip model, the reduction of stiffness and energy absorption ability, or shift of displacement are also taken into consideration.

著者

峯村 廣紀 五十田 博 服部 学

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.79, no.698, pp.491-498, 2014-04-30 (Released:2014-07-15)

参考文献数

12

被引用文献数

4 5

---

One of key issues of recent seismic structural design for buildings is the safety performance against long duration earthquake, repeated earthquake and severe earthquake after main shock. It may be difficult for conventional shear walls of wood house such as bracing and plywood shear wall to survive during their earthquake.In this study, shear wall with high stiffness rubber was proposed to prevent the degradation of seismic performance during repeated earthquakes and shear wall test and shaking table test were conducted in comparison with plywood conventional shear wall. Following results were obtained:1 In shear wall test, it was found that no degradation occurred in proposed shear wall in the range of 1/30rad.2 In shaking table test, the specimen without proposed shear wall was damaged in three times severe earthquakes, while the specimen with it was survived in five times severe earthquakes.

著者

李 尚元 松本 雄馬 八百山 太郎 肥田 剛典 糸井 達哉

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.88, no.812, pp.1406-1416, 2023-10-01 (Released:2023-10-01)

参考文献数

28

---

This paper proposes a nonparametric Bayesian updating method for nonlinear seismic response analysis models considering uncertainties using Variational Auto-Encoder (VAE). The proposed method is used for calculating the likelihood of the parameters for the response analysis model using VAE without any assumptions about the probability distribution. The proposed method is confirmed to successfully update the probability distribution of the parameters of a bilinear single-degree-of-freedom system. To discuss the characteristics of the proposed method, the relationship between the uncertainty due to the lack of information on the nonlinear response and the width of the posterior distribution of the parameters is investigated.

著者

篠原 昌寿 五十田 博 清水 秀丸

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.81, no.729, pp.1859-1868, 2016 (Released:2016-11-30)

参考文献数

28

被引用文献数

2 2

---

1. Introduction In Japan, high performance damping buildings and houses are required to improve seismic safety and to minimize damage, because of many occurrences of severe earthquakes. On the other hand, Japanese wooden houses do not have enough shear walls to keep large and many openings and semi-rigid timber portal frame has been developed and has increased. However, semi-rigid timber frame structure is relatively soft. This paper presents seismic performance of semi-rigid timber frame structure with damper through full-size shaking table tests. We compared response deformations during moderate and severe ground motions among only frame, frame with oil damper and frame with shear wall to verify damping effect of oil damper. 2. Overview of damping wall with oil damper Damping wall system consist of a oil damper set horizontally through a ∧ shape steel member installed between two columns and below a beam of wood (hereinafter, referred to as "∧-type damping wall"). ∧-type damping wall is a system where damper deformation becomes almost the same as the story deformation. ∧-type damping wall has a high damping force compared to other damping walls that exist in the field of wooden houses nowadays in Japan. Relief force of the oil damper is 12 kN and the relief velocity is 70 mm/sec. 3. Overview of shaking table tests Planar shape of box-shaped one-story specimen is 5460mm (direction of vibration) × 3640mm (Orthogonal direction of vibration), and its height is 2835mm. Ground motion is input in one direction. There are three types of structures set in series in the direction of vibration, the outer two structures are semi-rigid timber frames and the structure at the center is ∧-type damping wall or seismic wall of plywood. The detail for each structure is described as follows. (1)Semi-rigid timber frame with oil damper. (2)Semi-rigid timber frame with seismic wall of plywood. (3)Semi-rigid timber frame only. The total weight of specimen is 87.0kN. Moment resisting joint of semi-rigid timber frame is using lagscrewbolt, metal connector and nut. Procedure of construction is embedding the lagscrewbolt into the column and beam, and setting up a metal connector, and binds with nut. Size of column is 120mm × 300mm and wood specimen is engineering wood of European red pine (E105-F300). Size of beam is 120mm × 360mm and wood specimen is engineering wood of European red pine (E105-F300). For column base anchor bolt (M14, SNR490B) with growth capacity was used. Semi-rigid timber frame is considered to have a Co=0.51 seismic performance for elastic frame analysis. Seismic walls are placed in the center of structure row and are bonded both sides of plywood (t=12, N50 nail, @150). Seismic performance of this wall is almost equivalent to ∧-type damping wall. ∧-type damping wall and Seismic wall are considered to have a Co=0.11 seismic performance. Input seismic wave are three observation waves and one artificial wave. Observation waves are "ELCENTRO 1940 NS", "TAFT 1952 EW" "JMA Kobe 1995 NS". Artificial wave is "BSL wave" whose acceleration response spectrum is provided in the Building Standard Law. Seismic waves were scaled to two levels that represents medium and extreme earthquakes. 4. Results and Conclusions of shaking table tests Maximum response deformation of " Semi-rigid timber frame only " for Taft wave(25kine) is 1 / 106rad, for BSL wave(80%) is 1 / 45rad. This is large response deformation by specific seismic wave. "Semi-rigid timber frame with oil damper" reduces the response deformation for all evaluated seismic waves and can avoid damage to the structure.

著者

坂田 弘安 山崎 義弘 笠井 和彦

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.79, no.695, pp.103-112, 2014-01-30 (Released:2014-07-10)

参考文献数

27

被引用文献数

3 3

---

In order to mitigate seismic damage of timber houses, application of passive control devises is demanded. The authors have developed high performance shear walls with various types of dampers, which are called “energy dissipation walls”. For the future, new design method has to be proposed to generalize passively controlled timber structures. In this paper, a method to evaluate allowable strength of shear wall is proposed. Advantage of passively controlled structure is to reduce maximum deformation, and energy dissipation walls are added to a structure so that maximum deformation angle of the structure subjected to level2 earthquake is less than target deformation. Accuracy of the method is demonstrated through a lot of non linear time history analyses.

著者

中尾 方人 村上 雅英 山口 修由 宮澤 健二

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.73, no.624, pp.291-298, 2008-02-28 (Released:2008-10-31)

参考文献数

24

被引用文献数

1

---

This paper proposes the evaluation method of seismic performance of shear resisting elements in timber construction with shear walls. Proposed new evaluation method uses two parameters of horizontal stiffness and potential energy of the shear walls. These two design values provide horizontal damage limit and safety limit strengths of stories that have equal quality to those by the summation of load-deformation curves of the shear walls. These strengths by this method have less variety than those by existing simple evaluation method. This method also provides Ds values of stories that consist of different type of shear walls. Ds values of the stories have not been provided by the existing simple evaluation method. Precise safety limit strengths and Ds-values of the stories realize to apply horizontal load-carrying capacity design method for the structures with different type of shear walls. This evaluation method would be possible to apply for other structures than the timber construction as a simplified method.

著者

中楚 洋介 立山 耕平 山田 浩之 川口 健一

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.84, no.766, pp.1525-1532, 2019 (Released:2019-12-30)

参考文献数

14

被引用文献数

1

---

Finishing materials installed at the building surface closest to the living space of people often fall down and harm the life, body or property. Ceiling collapse especially occurs by the various reasons, e.g. the rain leaking, dew condensation, wind, traffic vibration, on a daily basis. In addition, the ceiling collapse tends to occur in the region where the seismic intensity is over five lower during earthquakes. The authors propose the quantitative evaluation method to assess the degree of risk of the ceiling collapse by comparing the impact force and the proper human tolerance. So far, we dropped the various ceilings having commercial size of 910 mm square from one to twenty meters high using the guide wires to hit to the dummy head remaining horizontal and measured the impact force with the load cell installed underneath of the dummy head. However, the experimental conditions are constrained. Therefore, the examination regarding the efficiency of ceiling size and impact angle is insufficient. To do the parametric study by the numerical analysis, the material properties of the finishing material in a wide range of strain rates are needed. However, few reports are available on the material properties of the finishing materials. In this study, a series of compressive tests, i.e. quasi-static tests, dynamic tests and impact tests by split Hopkinson pressure bar method, at various strain rate from 10-5 to 103 s-1 were conducted to examine the strain rate effect on the compressive property of the representative finishing materials: gypsum boards, calcium silicate boards and rock wool sound absorbing boards. The results obtained from this study are following: 1) The X-ray CT images show the internal structure of the finishing materials. The porosity of the gypsum boards is about 25%, and it was also slightly observed in the rock wool sound absorbing boards. On the contrary, it was found that the calcium silicate boards were the solid material with no void. 2) It was revealed that all materials used in this study have the strain rate dependence of the compressive strength at the strain rate from 10-4 to 103 s-1. In addition, it was found that the strength drastically rose at the strain rate of about 102 s-1, although it is not confirmed that the strain rate dependence is attributed to the material itself or its foam, i.e. open cell structure. 3) The constants for Cowper-Symonds constitutive equation (dynamic constants) of the representative finishing materials were identified by least-squares method based on the compressive test results. Due to this, it can be expected to improve simulation accuracy in the future.

著者

藤田 慎之輔 寒野 善博

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.82, no.732, pp.193-201, 2017 (Released:2017-02-28)

参考文献数

15

被引用文献数

3 2

---

Recently, methods to obtain truss or frame with high stiffness by the topology optimization problem of minimizing compliance has been studied actively. In general, cross-sectional areas or shapes of each member are defined as design variables in such a topology optimization problem. Practically, since the member cross-sections are to be selected from predetermined candidates, the design variables are treated as discrete variables. Therefore, heuristics or mixed-integer programming (MIP) is selected as the algorithm for solving truss or frame topology optimization problems. In particular, MIP has an advantage that the global optimality of the solution is guaranteed mathematically. However, it is difficult for MIP to treat large scale problems because of the high computational cost. In previous studies, the topology optimization using MIP is limited to small-scale problems, such as trusses or 2D-frames. In recent years, second-order cone programming (SOCP) has attracted attention since it can be solved efficiently by using the interior-point method. It is reported in the latest study that mixed-integer second-order cone programming (MISOCP), i.e., the problem obtained by adding the integrity to some of the variables of SOCP, can deal with the large scale problem compared with MIP. In this paper, the topology optimization of 3D-frame, which is difficult to treat by using MIP, is solved by using MISOCP. First, the 3D-frame topology optimization problem of minimizing compliance is formulated as MISCOP by using the dual problem of total potential energy minimization problem. From this formula, various 3D-frame topology optimization problems of minimizing compliance in which various sets of cross-sectional shapes are defined as design variables are considered. In this paper, 3D-cantilever with tip load, latticed dome with central concentrated load, and simple building with vertical and horizontal loads are optimized by SOCP in various design value cases. In almost all of the optimization cases, the solver has terminated with finding the global optimal solution. In only a few optimization cases which could not find the global optimal solutions, the MISOCP solver was run with time limit and the best feasible solutions found by the solver are reported. These solutions are not necesarily global optimal solutions, but these are good solutions in the cases of this paper. As numerical experiments for comparison, topology optimization problems treated in this paper were tried to be solved by using MIP as well, but the optimal solutions could not be found at all within realistic computational time. The obtained main results are as follows: •The 3D-frame topology optimization problem of minimizing compliance can be formulated as MISOCP by using the dual problem of total potential energy minimization problem. •MISOCP can solve various large scale 3D-frame topology optimization problems which are difficult for MIP to treat because of the high computational cost. •For a larger problem which is beyond the capability of MISOCP, MISOCP cannot find the global optimal solution but can find solution good enough. The commercial solvers which treat MISOCP have been developed extensively, and calculation speed is improved year after year. Against this background, there exists a possibility that the MISOCP will become a powerful topology optimization tool for building structures.

著者

曽田 五月也 宮津 裕次 松永 裕樹

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.75, no.649, pp.559-566, 2010-03-30 (Released:2010-06-09)

参考文献数

12

被引用文献数

2 1

---

This study proposes a structural system which aims at improving the seismic performance of new and existing wooden houses making use of oil dampers. Problems to install any special damping devices into wooden structures are known, for one thing to be the wood being brittle in bending and the other the strength of the joint between the device and wood being relatively low. Therefore, to get rid of these problems, we developed an oil damper which works only when subject to compression and is provided with relief valves to limit the maximum resistance. First part of the study deals with a series of harmonic loading tests to see if the damper exhibits the same properties as designed beforehand. Then, the dampers are mounted as knee braces at the corners of wood panels which is subject to dynamic loading tests in two ways. First one is a test to apply sinusoidal inertial force to an isolated panel. Second one is a shaking table test on full scale single-story wood frames. From these tests, we confirmed that the damper can absorb as much as nearly 60% of seismic input energy. It is also confirmed that the installment of the damper makes it possible for wooden frames that collapses at the first strike of strong ground motion to withstand the same ground motion several times with no significant damage accumulation to main structures. Lastly, these test results are compared to analytical results and it is concluded that the proposed structural system do work to improve seismic safety of wooden houses.

著者

横山 裕 佐藤 晋哉 横井 健

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.78, no.690, pp.1359-1365, 2013-08-31 (Released:2013-11-30)

参考文献数

9

---

Floor-slipperiness is a crucial factor in designing buildings for cohabitation with pets. This study proposes an indicator of floor slipperiness applicable to small-breed indoor dogs prone to skidding accidents. The incidence of skidding was recorded by applying load elicited by movements of 12 dogs on 6 flooring materials with different Coefficient of Slip Resistance (CSR). The relationship between recorded incidence and floor materials' CSR revealed that dogs slowed their movements to avoid skidding on low CSR floors. A range of CSR that does not slow dogs' movements was determined and its minimum value is proposed as the required lower limit.

著者

平澤 涼一郎 中野 達也 阿久津 英典 宮川 和明

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.88, no.806, pp.655-665, 2023-04-01 (Released:2023-04-01)

参考文献数

6

---

In this paper, out-of-plane bending stiffness of column-end connection between square hollow section column and thick panel with different width was investigated by loading test and finite element analysis. From the results, column-end connection of corner-type under 45-degree directional force has the smallest stiffness, and of which section dose not remain plane, and proportion of bending resistance caused by partial deformation of column in column-end bending resistance is very small. Therefore, method to estimate out-of-plane bending stiffness of column-end was proposed based on deformation of diaphragm of hollow section of panel and directly above panel.

著者

村尾 修 山崎 文雄

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.65, no.527, pp.189-196, 2000-01-30 (Released:2017-02-03)

参考文献数

24

被引用文献数

37 46

---

This paper presents fragility curves for buildings based on damage data due to the 1995 Hyogoken-Nanbu Earthquake. The fragility curves in terms of the structural type and construction period were constructed using the building damage data of Nada Ward surveyed by Kobe City for the purpose of property tax reduction. It was also demonstrated that the number of damaged buildings in Nada Ward estimated by the fragility curves fits the actual damage by the earthquake. The fragility curves thus obtained may be useful for damage assessments of buildings in Japan.

著者

小林 正人 佐藤 啓太 佐藤 和紀

出版者

日本建築学会

雑誌

日本建築学会構造系論文集 (ISSN:13404202)

巻号頁・発行日

vol.87, no.802, pp.1123-1132, 2022-12-01 (Released:2022-12-01)

参考文献数

10

被引用文献数

1

---

In 2016, a countermeasure against the Nankai trough long-period and long-duration ground motions (LPGMs) was announced. However, the response spectrum method (RSM), indicated by the Ministry of Construction notification Vol. 2009 (MCN), is out of the countermeasure. An RSM that considers characteristic changes due to repeated deformation has also been proposed, but since the damping correction formula of MCN is used, its applicability to LPMGs has not been sufficiently investigated. In this paper, we proposed a method for evaluating the influence of characteristic changes due to repeated deformation using RSM for LPGMs and seismically isolated buildings using LRB.