剪力墙抗震能力设计措施有效性的校验与改进

摘要

In order to investigate the effective seismic capacity design measures of shear wall and to realize expected failure modes under strong earthquake, the existing problems in current seismic capacity design measures are pointed out through theoretical analysis. The effectiveness of the measures of Chinese seismic design code is verified by fine finite element dynamic time-history analysis of examples. Improving measures are then put forward and are verified through example analysis. It is shown the bending ductile demand of bottom section of shear wall increases too much based on moment capacity design measures of Chinese seismic design code 2001 in the rigid foundation assumption under rare earthquake action, and its bearing capacity for vertical axis force loses; the shear capacity design measures of current seismic design code would lead to shear failure in the stores above the bottom ductility strengthening area. Some improved bending and shear seismic capacity design measures of shear wall are proposed and are verified to be effective.%为研究有效的剪力墙抗震能力设计措施,引导其在强震中实现可控的预期破坏模式,通过理论分析指出目前剪力墙能力设计措施存在的问题,通过精细有限元动力时程算例分析,校验了中国规范剪力墙能力调整措施的有效性；提出了改进措施,并进行了算例验证.结果表明,在刚性地基假定下中国2001版抗震规范抗弯能力调整措施使得剪力墙底截面在大震下弯曲延性需求过大、竖向承载力丧失,而底部延性加强区其他部位不易屈服,现行规范采用的抗剪能力措施不能有效避免底部加强区以上楼层剪力墙剪切失效；提出的抗弯和抗剪能力设计措施经算例验证是有效的.