第一作者徐强男，博士生，1986年生

通信作者郑山锁男，博士，教授，博士生导师，1961年生

基于结构损伤的在役钢框架地震易损性研究

徐强1,2， 郑山锁2， 程洋2， 韩言昭2， 田进2

(1.长安大学地质工程与测绘工程学院，西安710054; 2. 西安建筑科技大学土木工程学院，西安710055)

摘要：针对钢材锈蚀会致结构过早失效、需对不同龄期结构进行抗震性能评估问题，提出基于首超变形及累积塑性转角的双参数构件损伤模型；考虑构件与层权重系数建立结构整体损伤模型，定义结构4种破坏状态。通过已有钢材锈蚀规律引入时间参数，建立钢材多龄期本构与钢框架全寿命地震易损性模型，以9层梁柱焊接钢框架为例，选20条满足场地条件的地震波，对不同龄期(0年、25年、50年、75年、100年)钢框架分别进行动力增量(IDA)分析，所得不同龄期结构整体损伤指数与地震动参数(峰值加速度)之间满足指数关系，给出5个龄期、4种性能水平下结构易损性曲线。通过二次曲线回归拟合不同性态水平下结构破坏时峰值加速度(PGA)平均值及对数标准差与龄期关系，建立结构随龄期变化的连续失效概率函数，获得结构失效概率随龄期变化规律。

关键词：钢框架；结构损伤模型；易损性分析；全寿命；锈蚀

收稿日期：2013-10-21修改稿收到日期：2014-01-09

中图分类号:TU528.01文献标志码：A

Seismic vulnerability of steel framework in service based on structural damage

XUQiang1,2，ZHENGShan-suo2，CHENGYang2，HANYan-zhao2，TIANJin2(1.Geological Engineering and Surveying Engineering College，Chang’an University，Xi’an 710054，China;2. School of Civil Engineering, Xi'an University of Architecture and Technology, Xi’an 710055, China)

Abstract:The seismic performance of structures at different ages is necessary to be evaluated because the corrosion of steel may lead structure to earlier failure. A double parameters model for component damage based on the first super deformation and cumulative plastic corner was put forward to establish the overall structure damage model considering the weight coefficients for the component and layer, 4 kinds of damage states of the structure were defined. By introducing the parameter of time, the conventional rule for steel corrosion was used to establish the age constitutive and whole-life seismic vulnerability model of the steel frame. Taking a 9 floors frame with beam-column welded steel structure as an example. 20 seismic waves meeting the site conditions were selected to get the relationship between the overall damage index of structure and the peak ground acceleration (PGA) by using IDA analysis of steel frame at different ages (0 years, 25 years, 50 years, 75 and 100) in order to obtain the structure fragility curves of 5 instars and 4 performance levels. The relationships between the PGA mean value and age, as well as the PGA logarithmic standard deviation and age getting by quadratic curve regression analysis were used to obtain the continuous probability function of structural failure with the change of age.

Key words:steel frame; structural damage model; vulnerability analysis; life-cycle; corrosion

虽各国规范对钢材防腐均有明确规定，但钢结构因钢材锈蚀所致事故依旧频发，造成重大人员伤亡及经济损失。如2004年莫斯科一水上乐园因钢材锈蚀导致屋顶突然坍塌，伤亡人数达150人；……