填充墙失效可控的结构整体抗震能力提升方法

A method of improving global seismic capacity based on failure-controlled of infill walls for infilled structures

结构失效模式对应结构整体抗震能力,结构失效时所对应的最小地震作用作为结构的整体抗震能力。通过推覆分析(Pushover)找到结构的失效模式,从而为布置失效填充墙提供信息,通过布置失效填充墙,可改变并消除原有结构的最弱失效模式,从而提高结构的整体抗震能力;通过增量动力时程分析,可最终确定失效填充墙的最佳布置方案及结构的整体抗震能力指标,但填充墙的大量破坏会影响到结构的使用功能。通过在梁下部和填充墙顶部之间布置铅阻尼器既可有效地保护失效填充墙,又能使结构的整体抗震能力得以提高。算例说明了本文提出的分析方法的先进性和可行性,研究结果表明,考虑失效填充墙的作用能够使结构的整体抗震能力得到提高,铅阻尼器能够使失效填充墙的破坏得到有效控制。

The seismic capacity of building is corresponding to the weakest failure mode of building.The minimum earthquake action,under which structure arises the weakest failure mode,is called the global seismic capacity（GSC） of structure.Pushover analysis was carried out to find the failure mechanism of structure,which offered the information for placing allowed failure of infills（AFIs）.Then,the weakest failure mode was eliminated for placing AFIs and GSC of structure was improved in the end.The optimum placing plan of AFIs and GSC index can be both obtained due to lots of incremental dynamic analysis（IDA）.However,damage of AFIs would cause function loss of building.Shearing lead damper was then adopted to protect AFIs from immediately damage.Also,the GSC of structure was improved at the same time.The example shows that this method is advanced and feasible.The results indicate that GSC of infilled frames was greatly improved by considering the function of AFIs,and the failure of AFIs was controlled by using shearing lead damper.