摘要
无粘结预应力板柱结构形式简便、施工效率高,但其节点受力复杂、破坏机理仍有待深入研究。提出采用分层壳模型对该结构节点进行抗冲切性能分析,通过对5个试件进行分层壳模型建模计算和变形分布分析,得出计算结果与试验结果吻合较好,验证了分层壳模型及关键参数的合理性。同时,考虑了预应力筋布筋方式、有效预应力大小和混凝土强度等参数变化对节点抗冲切性能的影响,研究表明:预应力筋布置在靠近板柱节点位置应力增长最快,发挥作用最显著,增大有效预应力和混凝土强度可以提高抗冲切性能。
The unbonded prestressed slab column is simple in form and high in construction efficiency. However,the force of the joint is complicated and the mechanism of destruction still needs to be further studied.The layered shell model is used to analyze the punching shear performance of the joint.The modeling calculation based on layered shell model and deformation distribution analysis of five specimens are carried out.The calculated results are in good agreement with the experimental results to verify the rationality of the proposed layered shell model and its key parameters.Meanwhile,the influence of parameter variations,such as the distribution forms of the prestressed tendons,the effective prestress and the concrete strength,on the punching shear performance of the joint are also considered.The results show that the stress increases fastest and plays the most significant role when the tendons are placed close to the slab-column joints.Moreover,the punching shear performance will be improved with the increase of the effective prestress and the concrete strength.
作者
陈建伟
吴山
霍永刚
CHEN Jianwei;WU Shan;HUO Yonggang(College of Civil and Architectural Engineering,North China University of Science and Technology,Tangshan,Hebei 063210,China;Tangshan Institute of Green Building Industrial Technology,Tangshan,Hebei 063210,China)
出处
《施工技术》
CAS
2018年第22期131-135,共5页
Construction Technology
基金
国家自然科学基金项目(51678236)
关键词
混凝土分层壳模型
预应力
板
柱
模拟
concrete multi-layer shell model
prestressing
slabs
columns
simulation
