不平衡弯矩下板柱节点受弯性能参数研究

摘要

为了研究板柱节点在不平衡弯矩下的弹塑性性能,采用有限元软件ABAQUS对弯曲破坏控制下板柱节点的受力性能进行了数值模拟,通过与试验结果的比对,验证了有限元模型的有效性,并进一步描述了混凝土顶板在水平荷载作用下的损伤演化过程.在此基础上,研究了板配筋率和竖向荷载对板柱节点抗弯性能的影响,分析了加载过程中总不平衡弯矩与板底正弯矩和板顶负弯矩的相对关系.结果表明:随着板配筋率的增大和竖向荷载的减小,板柱节点的抗弯承载力提高,节点区转动能力增强.%In order to study the elastic-plastic behavior of slab column joint under unbalanced bending moment,the mechanical behavior of flexural-dominated slab-column connection was simulated using the finite element software ABAQUS,and the validation of the proposed FE model was verified by comparison with the experimental results.The damage evolution process of concrete roof under horizontal load was further described.Through the proposed model,the effects of plate reinforcement ratio and vertical load on the bending resistance of the slab column connection was studied,and the relative relationship between the total unbalance moment and the positive moment of the bottom plate as well as the negative moment of the top plate was analyzed.The results indicate that the bearing capacity and the deformation capacity of the slab column joint are improved due to the greater plate reinforcement ratio and lower vertical load.