上下层插筋连接预制混凝土空心模剪力墙有限元分析

发布时间：2018-06-20 08:08

本文选题：插筋 + 预制混凝土　；参考：《工程力学》2017年01期

【摘要】：讨论了有限元软件ABAQUS中模拟新老混凝土界面的不同方法,建议了有限元界面模型的参数定义方法,并通过试验验证了其合理性。基于新老混凝土界面模拟方法,对上下层插筋连接的预制混凝土空心模剪力墙的有限元模拟方法进行了验证。通过恒定轴压力及单调水平力作用下的有限元推覆分析,针对空心模剪力墙的受力性能进行了关于插筋搭接长度、插筋端头位置、插筋总受拉承载力、后浇混凝土强度和轴压比的参数分析。结果表明,所采用的新老混凝土界面模拟方法及基于其进行的空心模剪力墙有限元模拟准确、合理;插筋搭接长度取1.2倍锚固长度能够满足要求;增大插筋总受拉承载力可提高墙体承载力,受拉开裂较严重的区域上移并向内延伸;为充分发挥墙体的承载能力,建议后浇混凝土强度不应低于预制混凝土强度;轴压比较大时,墙体受压损伤区域增多,影响墙体的承载力稳定性和变形能力,建议在墙体底部增设拉筋及水平分布筋,以改善墙体在较高轴压比下的抗震性能。
[Abstract]:Different methods of simulating the interface between new and old concrete in finite element software Abaqus are discussed. The parameter definition method of finite element interface model is suggested, and its rationality is verified by experiments. Based on the new and old concrete interface simulation method, the finite element simulation method of precast concrete hollow form shear wall connected by upper and lower layers is verified. Through the finite element analysis under constant axial pressure and monotone horizontal force, according to the mechanical behavior of hollow die shear wall, this paper deals with the length of lapping, the position of the end of the insertion, and the total tensile capacity of the insert. Parameter analysis of strength and axial compression ratio of post-cast concrete. The results show that the new and old concrete interface simulation method and the finite element simulation of hollow formwork shear wall based on it are accurate and reasonable, and 1.2 times of anchoring length can meet the requirements. It is suggested that the strength of post-cast concrete should not be lower than that of precast concrete in order to give full play to the bearing capacity of the wall and to increase the total tensile capacity of the wall and increase the bearing capacity of the wall. In order to improve the seismic performance of the wall under higher axial compression ratio, it is suggested that tensile bars and horizontally distributed tendons should be added to the bottom of the wall to improve the seismic performance of the wall under high axial compression ratio, which affects the stability of the bearing capacity and the deformation ability of the wall.
【作者单位】：清华大学土木工程安全与耐久教育部重点实验室;清华大学建筑设计研究院有限公司;
【基金】：国家自然科学基金项目(51478243) 国家863计划课题项目(2013AA041307)
【分类号】：TU398.2

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