基于塑性变形的钢结构地震损伤量化

The Steel Structure Seismic Damage Quantitative Research Based on Plastic Deformation

目的进行钢结构建筑在地震作用下损伤评估的量化研究.方法采用弹塑性损伤模型模拟强震作用下钢结构建筑损伤状况,以EL-Centro地震波做为输入地震力,并借助ABAQUS进行强震作用下结构的弹塑性时程计算.通过对比地震前后的钢结构模态变化,且在多高层钢结构结构性能水准进行了指数化处理的前提下,确定结构层间及整体损伤系数.结果对某九层钢结构地震损伤数值模拟的量化研究,结构整体损伤指数为0.139,表明结构处于轻微破坏,在轻微破坏中且处于中等程度,基本符合预期结果.结论相对于定性化描述,损伤指数的给出更能准确描述结构的破坏程度.应进一步加强钢结构地震作用下损伤演化的研究,使得整体损伤指数的确定更加合理化.为钢结构震后的健康诊断及安全评估提供准确依据.

This paper conducted the steel structure building damage quantitative research under the earth- quake affects, studied steel structure building key parts damaged under the action of earthquake by using the elastic and plastic damage model. By comparing before and after the earthquake of steel structure modal changes, and also under the high-level steel structure performance standard index processing, determined sto- rey and the overall injury factors. With the EL-Centro as input of earthquake seismic wave power, whole damage index of a nine floors steel structure is 0. 139. The results show that the degree of damage better meets expectations. Finally, we should strengthen the research of structure key parts damage, and provide ac- curate basis for steel structure of health diagnosis and safety assessment after an earthquake.