著者

壁谷澤 寿海 田村 幸雄 寺本 隆幸 中島 正愛 翠川 三郎 福和 伸夫 大崎 純

出版者

一般社団法人日本建築学会

雑誌

建築雑誌 (ISSN:00038555)

巻号頁・発行日

vol.118, no.1511, pp.8-17, 2003-11-20

著者

木下 拓也 大崎 純

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.647, pp.113-119, 2010-01-30 (Released:2010-04-02)

参考文献数

17

被引用文献数

2 3

---

A new concept is presented for seismic isolation system using a compliant mechanism. Optimization approach is utilized for generating a truss structure that has specified equilibrium path, which can be achieved utilizing elastic deformation of a structure and geometrical nonlinearity. The truss structure can be used as a base-isolation system by assigning a path with gradually increasing load with respect to the displacement. Weighted sum of the error of the equilibrium path from the target path is minimized through optimization procedure. The compliant truss mechanism obtained from optimization is designed as the isolator model for the building frame. The effectiveness of our model of isolation system is validated by the result of time history analysis using recorded seismic motions.

著者

萩下 敬雄 大崎 純

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.633, pp.1959-1965, 2008-11-30 (Released:2009-10-28)

参考文献数

24

被引用文献数

1 1

---

A new approach integration heuristics and nonlinear programming is proposed for topology optimization of discrete structures under stress and local buckling constraints. In the approach, the optimal ground structures are searched by heuristics, and topology optimization is performed for each ground structure based on nonlinear programming. Two heuristics are applied; namely, tabu search, and a new heuristic method called topology mining, which is based on the apriori algorithm. Three numerical examples are solved to demonstrate the effectiveness of the proposed approach. Moreover, the efficiency in view of computational cost of the two heuristics is discussed by comparing the optimization results.

著者

崔 京 蘭 大崎 純 中村 奎吾

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.737, pp.1137-1143, 2017 (Released:2017-07-30)

参考文献数

21

被引用文献数

1 2

---

Recently, a number of designers have focused on free-form surface shell to realize a free architectural form that is different from the analytical curved surface such as cylindrical or spherical surfaces. However, in order to create rational architectural forms, constructability and cost are also essential factors to be considered. Developable surface is a special form of ruled surface generated by continuous movement of the straight line. It can be obtained by adding the condition that the normal vector of the surface does not change along the generating line (generatrix). Because the generatrix is a straight line without torsion, the formwork of continuum shell is easily created. Since the twisting process is not required, it has a high workability characteristics. In this study, several developable surfaces are combined to form a curved roof structure. The (n,1) Bézier surface is used for modeling the surface. Optimization problem is formulated for minimizing the maximum principal stress under several static loading conditions including vertical and horizontal loads. The coordinates of control points of the Bézier surface are chosen as design variables. The developability condition is numerically assigned so that the tangent vectors at the same parameter value of the two Bézier curves along the boundary exist in the same plane as the directing line. The G0 and G1 continuity conditions are assigned for connecting the Bézier surfaces. Optimal solutions are found using nonlinear programming approach, where the sensitivity coefficients are computed by the finite difference approximation. As the result of optimization, a variety of developable surfaces are obtained by connecting Bézier surfaces. Since the control points of the curves are chosen as design variables, the calculation efficiency is high. The stress distribution also greatly improved by using the maximum stress as the objective function.