新型叠合板式剪力墙受弯性能研究

发布时间：2018-01-24 19:24

本文关键词： 叠合板式剪力墙新旧混凝土结合面受弯性能数值模拟参数分析　出处：《烟台大学》2017年硕士论文　论文类型：学位论文

【摘要】：推进我国建筑工业化发展的核心任务是开发契合我国建筑工业化发展的结构体系。预制混凝土叠合板式剪力墙为半预制装配式剪力墙结构,是钢筋混凝土剪力墙结构体系由现场浇筑到完全装配的过渡。预制混凝土叠合板式剪力墙结构具有装配程度高、建造质量好、环保节能、取代传统模板的优点,符合建筑工业化的发展要求。本文提出了一种无界面钢筋的新型叠合板式剪力墙结构,该结构的两侧为预制混凝土墙板,预制板中间空隙内浇筑混凝土形成整体结构。两侧预制板间无界面钢筋,内部存在的新旧混凝土结合面是墙体受力的薄弱环节,其连接性能决定了墙体的受力性能。本文对该新型墙体开展了试验研究和数值分析,对新旧混凝土结合面的受力性能和界面构造进行了详细分析,主要研究成果如下:(1)完成了3片新型叠合板式剪力墙试件在恒定轴力作用下的拟静力试验,得到了新型叠合板式剪力墙的破坏过程和破坏形态。试验结果表明:在正常使用状态下,新旧混凝土结合面粘结良好,能够保证墙体整体受力;墙体均发生弯曲破坏,即边缘纵筋屈服;根部混凝土压溃。(2)通过分析各试件的滞回性能、骨架曲线、承载力、刚度和变形等性能指标,研究了边缘纵筋配筋率、界面构造等参数对新型叠合板式剪力墙受弯性能的影响。结果表明:边缘纵筋配筋率是影响叠合板式剪力墙受弯性能的重要因素,随边缘纵筋配筋率的提高,墙体的受弯承载力和耗能能力显著提高,刚度退化速度减缓,新旧混凝土间的相对变形减小;粗糙面及键槽构造两种界面处理方式均可保证墙体正常使用条件下的整体性能,但键槽构造能够提高墙体耗能能力,延缓墙体的破坏进程;对墙体峰值荷载后的稳定性产生有利作用。(3)基于有限元软件ABAQUS,建立了新型叠合板式剪力墙的数值分析模型,采用库伦摩擦模型和内聚力模型相结合的方式对新旧混凝土结合面进行了数值模拟,分析了墙体的破坏形态、骨架曲线、新旧混凝土界面处的相对变形等关键指标,结果表明,采用库伦摩擦模型和内聚力模型相结合的方式可对新型叠合板式剪力墙进行数值模拟,模型合理,结果可靠。(4)本文还对新型叠合板式剪力墙进行有限元参数扩展分析,研究了插筋配筋率、边缘纵筋配筋率、轴压比等关键参数对墙体受力性能的影响,结果表明:插筋配筋率对墙体承载力和刚度影响较小,但提高插筋配筋率,可改善墙体的延性;边缘纵筋配筋率对墙体的承载力和刚度影响较大,随着边缘纵筋配筋率的提高,墙体的承载力和初始刚度增大,延性提高;轴压比对墙体承载力和刚度影响显著,随轴压比的提高,墙体承载力和初始刚度大幅度增大,而延性降低。
[Abstract]:The core task of promoting the development of building industrialization in China is to develop the structure system which is suitable for the development of building industrialization in our country. The prefabricated concrete laminated slab shear wall is semi-prefabricated prefabricated shear wall structure. Precast concrete laminated slab shear wall structure has the advantages of high assembly level, good construction quality, environmental protection and energy saving, replacing traditional formwork. In this paper, a new type of laminated slab shear wall structure without interface reinforcement is proposed. The two sides of the structure are precast concrete wall slabs. There is no interfacial reinforcement between the two prefabricated boards, and the existing new and old concrete joint surface is the weak link of the wall force. The connection performance of the wall determines the mechanical performance of the wall. In this paper, the experimental study and numerical analysis of the new wall are carried out, and the mechanical properties and interface structure of the new and old concrete joints are analyzed in detail. The main research results are as follows: (1) Quasi-static test of three new laminated plate shear wall specimens under constant axial force is completed. The failure process and failure pattern of the new type composite slab shear wall are obtained. The experimental results show that the new and old concrete joints are bonded well in normal service, which can ensure the integral force of the wall. Bending failure occurs in all the walls, that is, the longitudinal tendons yield at the edge; By analyzing the hysteretic performance, skeleton curve, bearing capacity, stiffness and deformation of each specimen, the reinforcement ratio of longitudinal reinforcement on the edge was studied. The effect of interface structure and other parameters on the flexural behavior of the new type laminated plate shear wall is studied. The results show that the reinforcement ratio of the edge longitudinal reinforcement is an important factor affecting the flexural performance of the laminated plate shear wall, and with the increase of the reinforcement ratio of the edge longitudinal reinforcement. The flexural bearing capacity and energy dissipation capacity of the wall are improved significantly, the stiffness degradation rate is slowed down, and the relative deformation between the new and old concrete is reduced. Rough surface and keyway construction can guarantee the whole performance of the wall under normal service condition, but the keyway construction can improve the energy dissipation capacity of the wall and delay the failure process of the wall. Based on the finite element software Abaqus, the numerical analysis model of a new type of laminated plate shear wall is established. The combination of Coulomb friction model and cohesive force model is used to simulate the new and old concrete joints, and the failure form and skeleton curve of the wall are analyzed. The results show that the combination of Coulomb friction model and cohesive force model can be used to simulate the new composite plate shear wall, and the model is reasonable. Results reliable. 4) in this paper, the finite element parameter expansion analysis of the new type laminated plate shear wall is carried out, and the influence of the key parameters, such as the reinforcement ratio of the inserted bar, the ratio of longitudinal reinforcement on the edge and the ratio of axial compression, on the mechanical properties of the wall are studied. The results show that the reinforcement ratio has little effect on the bearing capacity and stiffness of the wall, but the ductility of the wall can be improved by increasing the reinforcement ratio. The reinforcement ratio of longitudinal reinforcement on the edge has a great influence on the bearing capacity and stiffness of the wall. With the increase of the reinforcement ratio of the longitudinal reinforcement on the edge, the bearing capacity and initial stiffness of the wall increase, and the ductility of the wall increases. The axial compression ratio has a significant effect on the bearing capacity and stiffness of the wall. With the increase of axial compression ratio, the bearing capacity and initial stiffness of the wall increase greatly, while the ductility decreases.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.2

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