一般化応答スペクトル解析法に基づくグリッドシェル構造の形態創生手法 を提案しました。本研究は私が推進している耐震最適化の研究シリーズの1つであり、空間構造の複雑な地震応答特性とダンパーの応答低減効果を直接考慮した屋根の形状探索を可能にしました。本研究はこれまで学術的・実用的に難しいとされてきた課題を解決したもので、既往研究を調べている限りではおそらく世界初です。博論で描いた青写真の１つに辿り着きました。本研究が採択率1割、計算力学の老舗CASに掲載されたことを光栄に思います。私の星付き論文です。オープンアクセスにしました。本研究は2022年の建築学会大会および第17回コロキウム構造形態の解析と創生にて日本語でも発表し，担当の学生は優秀発表賞に選ばれました！
I would like to share my paper entitled “Generalized response spectrum analysis based computational morphogenesis for metal gridshells with buckling-restrained braces subjected to seismic loading” published in Computers & Structures. Structural morphogenesis is widely used as a parametric tool to find an optimal structural shape of shell structures for a prescribed objective function and a given design load. However, the current optimization methods are limited to finding a geometry under only a specific static load like the dead load or an equivalent static seismic load for predefined geometrical shapes, and so can not be applied to free-form gridshells. This poses a challenge to achieving an efficient free-form shell structure in high seismic hazard areas. This paper aims to resolve this by presenting a computational morphogenesis method to obtain form-found shell structures by considering the dynamic seismic loads and the response reduction effects of seismic energy-dissipating devices using generalized response spectrum analysis. The method was applied to optimize the buckling-restrained brace layouts on target spherical metal gridshell structures with different diameter-to-height ratios. The resulting form-found structures had an efficient roof geometry, along with an efficient damper layout (to prevent member buckling and the dropout of finishing materials). Dampers were found to be more efficient if placed in the (relatively heavy) supporting structure instead of the roof, and a flattened but locally bulged roof shape proved to be the most efficient in mitigating the seismic response. The generalized response spectrum analysis significantly reduced the computation time while evaluating the displacement response with sufficient practical accuracy, although it slightly underestimates the acceleration response if compared to the conventional nonlinear response history analysis results.