基于冗余度与易损性的结构抗震能力提升方法研究

A method for the enhancement structural seismic capability based on redundancy and vulnerability

为提升结构整体性能和抗震性能,基于结构构件应变能对材料弹性模量的敏感性及其失效后结构的应变能变化量,建立了结构易损性与冗余度评价指标,以衡量在地震作用下构件发生破坏的容易程度及其失效后对结构整体性能的影响。考虑地震作用下结构构件冗余度及易损性差异,通过加强低冗余-高易损构件,同时削弱高冗余-低易损构件,合理调整各类构件截面面积。结果表明,构件的冗余度和易损性可以准确反映地震作用下结构构件的重要性及发生破坏的容易程度,考虑构件冗余度及易损性差异,调整结构构件面积,可有效提升结构的整体性能及抗震性能。

To improve the overall performance and seismic performance of a structure,and to assess the fragility of structural members and their failure effort on the structural overall performance under earthquake,two evaluation indexes were established to measure the vulnerability and redundancy of structural member based on the sensitivity of strain energy of members to modulus of elasticity of the materials,as well as the changes in the structural strain energy after damage.Then the differences in redundancy and vulnerability of structural members were considered,and the members with high vulnerability and low redundancy were strengthened,the ones with low vulnerability and high redundancy were weakened by adjusting the cross-section areas of the members.The results show that the redundancy and vulnerability of these structural members can reflect the fragility and the influence of their failure on the structure’s overall performance correctly.By adjusting the cross-section areas of members according to the differences in their redundancy and vulnerability,the overall performance and seismic performance of the structure can be enhanced effectively.