Abstract：For the timber-steel hybrid structure, the stiffness ratio of lightweight timber shear walls over the steel frame is an important parameter which affects the seismic performance of a structure. In order to study the influence of stiffness ratios of different stories on structural response, a regression model based on Gaussian stochastic process was employed to conduct variance-based global sensitivity analysis. In the analysis, 180 different timber-steel hybrid structures were established, the stiffness ratios of various stories were treated as factors, four different structural responses were taken into account, and the main effect and the total effect were adopted as sensitivity indices. The results indicated that, the fundamental period could be predicted with excellent accuracy using the Gaussian process model, and the coefficient of determination could reach over 0.99. The stiffness ratio of a story may significantly impact the maximum inter-story drift when the stiffness of the steel frame of a story changes obviously. The difference between total effect and main effect was greater than 0.3, indicating that the relationship between the maximum inter-story drift and the stiffness ratios has the apparent nonlinear feature. The maximum acceleration was the most sensitive to the stiffness ratio of the second story. The sensitivity of the base shear to the stiffness ratios varied with the change of the seismic hazard levels. The fundamental period was more sensitive to the stiffness ratios of lower part of the structure, and the difference between total effect and main effect was less than 0.001, implying that the fundamental period was mainly governed by the main effect of stiffness ratios.
罗琪 何敏娟 李征. 基于高斯过程的钢-木混合结构刚度比全局敏感性分析[J]. 土木工程学报, 2021, 54(8): 56-66.
Luo Qi He Minjuan Li Zheng. Global sensitivity analysis of wall-to-frame stiffness ratio of timber-steel hybrid structure based on Gaussian-process. 土木工程学报, 2021, 54(8): 56-66.
