钢-混凝土混合结构考虑温度荷载的有限元分析

分析了钢-混凝土混合结构在温度荷载作用下的实际工作状态,推导了混合节点中混凝土柱与钢梁中的自约束应力和外约束应力计算公式,采用三维有限元数值可视化模拟,研究了三种温度荷载工况下节点的应力分布状态。研究结果表明,由于节点构造的影响使得钢梁与混凝土柱中的温度应力无法释放,在节点区域出现了较大的应力集中现象。工程设计中应充分考虑温度应力对混合节点的不利影响,采取对混凝土柱端附加钢板箍进行加强或将钢梁底板上的锚固螺栓孔开成长圆孔的方法消除温度应力,防止混凝土柱开裂。

FINITE ELEMENT ANALYSIS OF STEEL-CONCRETE STRUCTURE UNDER TEMPERATURE LOAD

Based on analyzing steel-concrete structure′s working behavior under temperature load,it is deduced that the calculation formulae of selfrestricted stress and outside-restricted stress in a joint of concrete column and steel beam.And a 3D finite element numeric videotex analysis has been made to study the stress distribution of the joint under three load states.Results indicate that stress centralization in the jointzone as temperature stress caused by structure cannot be released.It should be considered the harmful effect caused by temperature stress to mixed joint,and measures such as appending steel hoop around concrete end or making an ellipse hole on the motherboard of the anchoring bolt are taken to prevent concrete cracking.