多层胶合木框剪结构地震响应及易损性分析

Seismic response and fragility analyses of multi-story glued laminated timber frame-shear wall structures

为研究地震作用下胶合木框剪结构的材料-结构与性能映射规律,考虑正交胶合木(cross-laminated timber,CLT)剪力墙连续性差异,设计了6个6层胶合木框剪结构,并采用OpenSees建立结构的有限元模型,对其开展模态分析和增量动力分析,研究CLT剪力墙构造对结构基本自振周期、基底剪力、最大层间位移角和楼层峰值加速度的影响,分析CLT剪力墙节点和胶合木框架节点的易损性。结果表明:相比采用竖向不连续CLT剪力墙的原型结构,采用竖向连续CLT剪力墙的原型结构层间位移角较小,但加速度敏感的非结构构件和CLT剪力墙节点更易损伤,其CLT剪力墙节点在8度罕遇地震作用下发生严重破坏和完全破坏的概率分别高于70%和40%;胶合木框架节点在地震作用下损伤较小,各原型结构胶合木框架节点在8度罕遇地震作用下发生轻微损伤的概率均小于25%。

This paper presents a study on the relationship between material-structure and seismic performance for glued laminated timber frame-shear wall structures.Six six-story prototype glued laminated timber frame-shear wall structures were designed with different construction types of CLT shear walls.The finite element models of the prototype structures were established in OpenSees.Modal analyses and incremental dynamic analyses were conducted.The fundamental periods,base shear,maximum inter-story drifts,and peak floor accelerations of these prototype structures were obtained and compared.The fragility of the connections within CLT shear walls and glulam frames was also evaluated.The results show that,compared to frame-shear wall structures with platform-type CLT shear walls,those with balloontype CLT shear walls have smaller inter-story drifts,while their acceleration-sensitive nonstructural components and CLT connections are more prone to damage.For the connections in balloon-type CLT shear walls,the probabilities of exceeding severe damage and collapse exceed 70%and 40%,respectively,during eight-degree strong earthquakes.The connection damage of glulam frames remained low during seismic events.Their probabilities of exceeding minor damage were lower than 25%during eight-degree strong earthquakes.