基于国内试验数据的钢筋混凝土构件性能指标研究

Research on performance index of RC components based on Chinese experimental data

钢筋混凝土构件的性能指标在性能化抗震设计中具有广泛应用。现有研究成果大多采用国外试验数据库,在国内实际工程结构的应用中面临挑战。因此,文中收集了国内公开发表的132组钢筋混凝土柱和24组钢筋混凝土梁的低周往复荷载试验数据,分析了《建筑抗震韧性评价标准》(GB/T 38591-2020)的转角性能指标与试验转角之间的相对误差。研究发现,《建筑抗震韧性评价标准》部分转角性能指标忽略了关键参数的影响,相对误差较高,各性能指标之间的安全冗余度相差较大。文中对此提出了修正的钢筋混凝土构件转角性能指标,更好地考虑了关键参数的影响,既降低了相对误差,又保证了安全冗余度的一致性,能够更合理地判断构件的损伤状态。

Performance indexes of reinforced concrete(RC)components are widely used in the performance-based seismic design of structures.Existing relevant research outcomes are mainly developed based on the foreign experimental database.Thus,challenges are encountered when the research outcomes are adopted in Chinese engineering structures.In this work,quasi-static cyclic test data of 132 sets of RC columns and 24 sets of RC beams in China are collected from published literature.Then,the performance indexes in the“Standard for Seismic Resilience Assessment of Buildings”(GB/T 38591-2020)are evaluated by analyzing the relative error between the performance index and the experimental results.It is found that the influence of a critical parameter is ignored,the relative errors of some performance indexes are large and the safety redundancies of different indexes vary considerably.Finally,modified performance indexes of RC components are proposed.The indexes can better consider the influence of the critical parameter,while simultaneously reducing the relative error and keeping the safety redundancy consistency.Hence,they are able to evaluate the damage status of the components more reasonably.