钢-混凝土预制混合梁受弯性能有限元分析

Finite Element Analysis of Flexural Behavior of Precast Hybrid Steel-Concrete Beam

基于两端固定边界条件下钢-混凝土预制混合梁的受弯性能试验,采用ABAQUS软件对其受弯性能进行非线性有限元分析.通过与试验结果对比,验证了材料本构模型、单元类型、接触关系和边界条件等建模方法的可靠性.利用验证的有限元模型研究了钢梁长度以及钢梁与混凝土梁设计受弯承载力比对受弯性能的影响.结果表明:该有限元模型能有效地模拟钢-混凝土预制混合梁在静力集中荷载作用下的受弯性能;初始刚度随钢梁长度的增加呈线性降低;随着钢梁长度的增加,极限荷载先增后减,当钢梁长度超过400,mm后,极限荷载降低缓慢,钢梁所受最大弯矩基本保持不变.当钢梁长度为200~400,mm、钢梁与混凝土梁设计受弯承载力比为1.0~1.2时,钢梁强度可得到充分利用,且钢材用量相对较少.

Based on the flexural test,the flexural behavior of precast hybrid steel-concrete beam with fixed-ends was analyzed by ABAQUS software.The reliability of the modeling methods,including material constitutive model,element type,interaction relationship and boundary condition,were verified in comparison with experimental results.Then,the finite element model was adopted to investigate the influence of the steel beam length and the steel beam to concrete beam bending strength ratio on the flexural behavior.The results show that the finite element model can effectively simulate the flexural behavior of the precast hybrid steel-concrete beams subjected to static concentrated load.With the increase of steel beam length,the initial stiffness decreases linearly,while the ultimate load first increases and then decreases.When the steel beam length exceeds 400,mm,the ultimate load decreases slowly and the maximum bending moment of the steel beam remains unchanged.When the steel beam length is 200-400,mm and the steel beam to concrete beam bending strength ratio is 1.0-1.2,the strength of steel beam can be fully developed with less steel material used.