（1 广州大学广东省地震工程与应用技术重点实验室， 广州 510405； 2 中国建筑科学研究院， 北京 100013）

［摘要］利用基于材料非线性的精细化有限元模型，根据混凝土损伤和钢材等效塑性变形得到了结构材料、构件、楼层、整体结构的损坏等级并研究了将其作为抗震性能指标的合理性。为进一步丰富结构抗震性能评价指标，给出了楼层非线性耗能、整体结构的非线附加阻尼比、刚度退化系数的计算方法。将上述计算和评价方法在完全自主研发的非线性显式动力有限元分析软件SAUSAGE中完成开发。利用SAUSAGE分析了某超高层框架-剪力墙结构在7组地震动不同强度作用下的非线性动力响应。讨论了材料应力、截面内力、损伤、等效塑性应变作为抗震性能评价的可行性。对比了不同强度地震作用下结构层间位移角、层间剪力退化系数、楼层非线性耗能、楼层损坏等级作为楼层抗震性能指标并判断结构薄弱楼层的差异。研究了最大层间位移角、基底剪力退化系数、非线性附加阻尼比、刚度退化系数、损坏等级作为结构整体评价指标的合理性及对地震动的离散性；从统计意义上分析了最大层间位移角和其他指标的相互关系。

［关键词］材料非线性； 抗震性能评价； 损坏等级； 非线性显式动力时程分析；  SAUSAGE软件

中图分类号：TU311-3, TU311-41文献标识码：A文章编号：1002-848X(2020)07-0017-11

Structural seismic performance evaluation method based on material nonlinearity

CAO Shengtao1,2, LI Zhishan1

(1 Guangdong Provincial Key Laboratory of Earthquake Engineering and Applied Technology, Guangzhou University, 

Guangzhou 510405, China; 2 China Academy of Building Research, Beijing 100013, China)

Abstract:Using the refined finite element model based on material nonlinearity, the damage grades of structural materials, members, stories and the overall structure were obtained based on concrete damage and equivalent plastic deformation of steel. The rationality of using them as indexes of seismic performance was studied. In order to further enrich the seismic performance evaluation index of the structure, the calculation methods of the nonlinear energy dissipation on the story, the non-linear additional damping ratio of the overall structure and the stiffness degradation coefficient were given. The above calculation and evaluation methods were developed in a completely independent self-developed nonlinear explicit dynamic finite element analysis software SAUSAGE. Using SAUSAGE, the nonlinear dynamic response of a super high-rise frame-shear structure under 7 groups of ground motions with different seismic intensities was analyzed. The feasibility of material stress, section internal force, damage, equivalent plastic strain as seismic performance evaluation was discussed. The story drift ratio of the structures, the degradation coefficient of the story shear forces, the nonlinear energy dissipation of the stories and the damage grades of the stories under different earthquakes with different seismic intensities were compared as the seismic performance indexes of the floors and the differences of weak floors were judged. The rationality of the maximum story drift ratio, the basement shear degradation coefficient, the nonlinear additional damping ratio, the stiffness degradation coefficient and the damage grade were analyzed as the overall evaluation index of the structure and the dispersion of the ground motion. The correlation between the maximum story drift ratio and other indexes was analyzed statistically.

Keywords:material nonlinearity; seismic performance evaluation; damage grade; nonlinear explicit dynamic time-history analysis; SAUSAGE software

作者简介：曹胜涛，博士，工程师，Email: caoshengtao@cabrtech.com