火灾下轴向约束钢柱性能的Shanley理论模拟  

Oretical Simulation of Axial Restrained Steel Column in Fire with Shanley Model

作　　者：李国强[1] 陈琛[1] 

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《同济大学学报（自然科学版）》2013年第4期490-495,共6页Journal of Tongji University:Natural Science

摘　　要：运用改进的Shanley理论对轴力和弯矩共同作用下的约束钢柱进行分析.在已有的Shanley模型上考虑轴向约束的影响,以铰链的两肢的应变作为基本未知量,考虑升温过程中引起的钢材的塑性变形和轴向温度膨胀,从而较为准确地得到钢柱的轴力-温度变化曲线,最后通过与初始轴力的对比得到钢柱的临界温度.计算结果表明该分析方法与有限元计算结果吻合较好.A modified Shanley model is proposed to study the post-buckling behavior of axially restrained steel columns under combined axial load and bending moment in fire. With the strains of two limbs of the model as unknown quantities, the modified Shanley model considers the influence of the axial restraint, the axial temperature expansion and the plastic deformation of steel in high temperature, and the axial force- temperature relationship of the column is obtained. The critical temperature of the column can then the obtained by the criteria of the axial force in the column returning to its original value before its exposure to fire. The critical temperatures predicated by the simplified model and finite element method agree with each other very well.

关 键 词：临界温度 约束钢柱 钢结构抗火 理论模拟 Shanley理论 

分 类 号：TU311.4[建筑科学—结构工程]