半刚性连接钢框架结构弹性时程分析

Elastic time-history analysis of steel frame structures with semi-rigid connections

用两端带转动弹簧的杆单元代替一般的杆单元,提出了一种新的平面杆系钢结构动力弹性时程分析计算模型。采用虚功原理,通过对单元转角-位移方程的修正,推导了这种计算模型的单元质量矩阵,并编制了相应的弹性时程分析计算程序,分析了连接的半刚性在不同地震动作用下对钢框架结构动力性能的影响,并与有限元结果进行了比较。算例结果表明:连接的半刚性对结构动力性能的影响非常大,结构的抗震性能优于刚性连接的情况。

A new calculation model for the elastic dynamic time-history analysis of plane steel structures is presented by replacing the general bar element with a new one, which has two rotational springs at its ends. By revising the rotation displacement equation, a mass matrix of this kind of structure is derived by virtual principle in this paper. An elastic time-history program for semi-rigid connected structures is worked out in this way. The effects of semi-rigid connection on the dynamic behavior of steel frames are analyzed under different seismic ground motions, and parts of results are compared with those from other finite element method. The results of calculations show that the semi-rigid connection behavior influences the dynamic behavior of steel structure greatly, and the seismic behavior of this type of structures is better than those with rigid connections.