新型钢结构节点抗震性能有限元分析比较

Comparative Analysis on the Finite Elements of the Shock Resistance of the New Steel Structure's Joining Points

在地震力的作用下 ,钢结构框架的梁柱节点发生脆性破坏的原因 ,一方面是由于节点设计不够合理 ,另一方面则是由于施工过程中遗留在节点内的一些缺陷所造成的。以弹塑性断裂力学为理论基础 ,用三维有限元的方法 ,对4种含有“人工裂纹”的节点进行了分析比较。计算了这些节点在不同荷载水平下的J积分 。

Under the force of earthquake,the brittle failure would occur in the beam-column of the steel structure framework,one cause of which is that there are some unreasonable designs in its joining points and another cause of which is that in the course of construction,there are some defects left in the joining points.On the theoretic basis of elastoplastic fracture mechanics and in three-dimensional finite elements' method,four kinds of joining points containing 'artificial cracks' are analyzed and compared in this paper.J Integral of these joining points under different loads is calculated and the effects of various improving methods on the improvement of the joining points' mechanical properties are compared.