基于修正Park-Ang模型的RC剪力墙损伤指数研究

Damage index of RC shear walls based on modified Park-Ang model

建筑抗震性能评估是基于性能的抗震设计的关键流程之一,要求构件性能点与构件损伤相关联。然而现有文献中对于构件损伤性能点的定义各有不同,且由于试验数据量过少,缺少基于试验数据的验证。为了促进建筑抗震性能评估的有效开展,本文从国内现有文献中搜集了160个RC剪力墙构件拟静力试验数据,建立了RC剪力墙构件试验数据库,对构件试验数据进行分析,根据构件破坏现象划分了5个损伤状态。研究了高宽比、配箍特征值和水平分布钢筋配筋率等设计参数的影响。根据试验数据,修正了Park-Ang损伤指标,可以同时考虑构件循环加载中的变形和耗能,可用于判定RC剪力墙构件损伤状态。标定了对应于不同损伤状态的损伤指数区间,研究结果可用于基于构件的抗震性能评估及易损性分析。

Seismic performance assessment of buildings is one of the key processes of performance-based seismic design,which correlates component performance level with component damage.However,current definitions of performance level differ from each other in available literature and are usually not calibrated using experimental data as a result of lack of enough test data.In order to facilitate the seismic performance assessment of buildings,experimental database is established for RC shear walls based on quasi-static test data of 160 specimens from available literatures in China.The test data are analyzed and five damage states are defined based on specimen damage.The effects of primary design parameters including depth-width ratio,stirrup characteristic value and horizontal distribution reinforcement ratio are also studied.The Park-Ang damage index is modified to estimate damage states of RC shear walls.Both specimen deformation and energy dissipation in the cyclic loading can be considered.Damage index ranges of different damage states are calibrated.The results can be used for component level seismic performance assessment and fragility analysis.