高烈度区局部大跨度单跨复杂结构罕遇地震下弹塑性分析

Elastic-plastic analysis of the complex structure with partial large-span and single-span under rare earthquake in high seismic intensity area

以某高烈度区既有局部大跨度单跨钢筋混凝土框架结构又同时存在大跨度单跨钢结构屋盖的混合结构为例,较为详细地讨论这类局部大跨度单跨复杂结构在罕遇地震下的抗震性能。在弹塑性分析过程中通过VBA编程对梁、柱的配筋结果进行自动归并,同时弹塑性分析模型材料参数与清华大学组织的钢筋混凝土框架柱和整体框架拟静力倒塌试验结果进行了对比验证。分析结果表明,基于《建筑抗震设计规范》(GB 50011—2010)合理设计的局部大跨度单跨(31m)框架结构可以满足"大震不倒"的性能化抗震目标;大跨度单跨钢结构屋盖的支座形式对所支承的框架结构在罕遇地震下的层间位移角有一定影响。

A hybrid structure with partial large-span reinforced concrete single-span frame structure and large-span steel structure roof in the high seismic intensity area was taken as an example to provide a detailed discussion on seismic performance of complex structure with partial large-span and single-span under the rare earthquake. In elastic-plastic analysis,VBA program was used to automatically merge reinforcements of beams and columns. Elastic-plastic analysis model and material parameters were compared with pseudo-static collapse experimental results of the frame column and overall frame given by Tsinghua University. Results show that single-span frame structure with the partial large-span of 31 m based on reasonable design under Code for seismic design of buildings（ GB 50011—2010） can meet the performance-based seismic goal of no collapsing under rare earthquake. The bearing type of large-span single frame steel structure roof has a certain influence on the inter-story displacement angle of supporting frame structure under rare earthquake.