竖向荷载作用下短肢剪力墙结构及节点受力性能试验研究
发布时间：2018-08-08 10:50
【摘要】：短肢剪力墙是一种介于异形柱和剪力墙之间的抗侧力构件,它组成的短肢剪力墙结构结合了框架结构和剪力墙结构的优点,由于没有像框架结构那样室内存在凸出墙面的柱,非常适用办公楼和商业住宅建筑,是现今的高层建筑结构中广泛运用的结构体系之一。近年来,国内外学者对短肢剪力墙结构进行了大量研究,得到了一些有价值的研究成果,但研究内容大多侧重于短肢剪力墙结构在水平荷载作用下的抗剪和抗震性能,利用整体结构模型对短肢剪力墙结构在竖向荷载作用下受力性能的研究较少。本文结合模型试验与有限元数值分析两种方法对短肢剪力墙结构和由墙梁组成的“T”型节点模型施加竖向均布荷载,来研究结构和节点在竖向荷载作用下的受力性能和变形特性,主要完成了以下工作:1、以一个实际工程中的短肢剪力墙结构为背景,选取靠近顶层附近的三层结构进行简化,结合结构模型试验的相似性原理,按照1:4的缩尺比例制作了一个三层两跨短肢剪力墙结构试验模型。用堆载法模拟均布荷载对结构模型进行竖向荷载作用下的静力试验。分析短肢剪力墙结构及节点的变形和受力情况,初步了解这种抗侧能力较强的短肢剪力墙结构在竖向荷载作用下的受力性能,为后续研究提供依据。试验表明:现浇混凝土短肢剪力墙结构的变形特征与框架结构接近。在竖向均布荷载作用下,现浇混凝土短肢剪力墙结构呈现出较好的承载能力,连梁与短肢剪力墙连接处为短肢剪力墙结构的薄弱区域,墙肢节点区域呈现压弯复合受力状态。2、运用ANSYS有限元软件建立与结构试验模型完全相同的空间模型,将有限元计算结果与试验结果对比,验证了ANSYS有限元模型的合理性,并分析了短肢剪力墙结构体系从受力开始至最终破坏的整个过程结构的应力分布和裂缝发展。结合节点区域在竖向荷载作用下的应力云图以及相关资料,描述了短肢剪力墙节点在竖向荷载作用下的受力过程、破坏机理。3、通过ANSYS有限元软件建立“T”型节点模型,分析节点模型在竖向均布荷载作用下节点模型的变形情况、裂缝开展和钢筋应力应变情况。以混凝土强度等级、墙肢纵筋配筋率、墙肢箍筋配筋率为参数来定量的研究分析各参数对短肢剪力墙节点抗压承载能力和抗裂能力的影响。4、总结了短肢剪力墙节点核心区竖向荷载作用下危险截面的验算公式。结合相关资料以及前文对短肢剪力墙结构在竖向荷载作用下的受力性能的分析,总结了短肢剪力墙结构设计的常见几个问题,并提出了相应的改进建议。
[Abstract]:Short leg shear wall is a kind of lateral force resisting member between special-shaped column and shear wall. Its short leg shear wall structure combines the advantages of frame structure and shear wall structure. It is very suitable for office buildings and commercial residential buildings. It is one of the widely used structural systems in tall buildings today. In recent years, scholars at home and abroad have done a lot of research on short-leg shear wall structures, and some valuable research results have been obtained. However, most of the research contents focus on the shear resistance and seismic behavior of short-leg shear wall structures under horizontal loads. There are few studies on the mechanical behavior of short-leg shear wall structures under vertical load using the integral structural model. In this paper, two methods, model test and finite element numerical analysis, are used to apply vertical uniform load to the short-leg shear wall structure and the "T" joint model composed of wall beams. To study the behavior and deformation of structures and joints under vertical load, the following work has been accomplished: 1. Taking the short leg shear wall structure as the background in an actual project, the three-story structure near the top floor is selected for simplification. Based on the similarity principle of structural model test, a three-story two-span short-leg shear wall structural test model was developed according to the scale of 1:4 scale. The static test of the structural model under vertical load is carried out by using the surcharge method. In this paper, the deformation and stress of the short leg shear wall structure and the joint are analyzed, and the mechanical behavior of the short leg shear wall structure with strong lateral resistance under vertical load is preliminarily understood, which provides the basis for further research. The experimental results show that the deformation characteristics of cast-in-place concrete short-leg shear wall structure are close to that of frame structure. Under the action of vertical uniform load, the cast-in-place concrete short-leg shear wall structure has a better bearing capacity, and the connection between beam and short-leg shear wall is the weak area of the short-leg shear wall structure. The area of the joint of the wall limb is in the state of composite compression and bending force. The spatial model is exactly the same as the structural test model established by using ANSYS finite element software. The rationality of the ANSYS finite element model is verified by comparing the finite element calculation results with the experimental results. The stress distribution and crack development of the short leg shear wall structure system from the beginning of the stress to the final failure are analyzed. Combined with the stress cloud diagram of joint area under vertical load and related data, this paper describes the stress process of short leg shear wall joint under vertical load, and the failure mechanism. The "T" joint model is established by ANSYS finite element software. The deformation, crack development and stress and strain of the joint model under vertical uniform load are analyzed. According to the concrete strength grade, the reinforcement ratio of the longitudinal reinforcement of the wall limb, The reinforcement ratio of stirrups is used as a parameter to quantitatively study and analyze the influence of each parameter on the compression bearing capacity and crack resistance of short leg shear wall joints. Finally, the checking formulas of dangerous section of short leg shear wall joints under vertical load in the core area are summarized. Based on the related data and the analysis of the mechanical behavior of the short leg shear wall structure under vertical load, this paper summarizes some common problems in the design of the short leg shear wall structure, and puts forward corresponding suggestions for improvement.
【学位授予单位】：湖南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.2
本文编号：2171560
[Abstract]:Short leg shear wall is a kind of lateral force resisting member between special-shaped column and shear wall. Its short leg shear wall structure combines the advantages of frame structure and shear wall structure. It is very suitable for office buildings and commercial residential buildings. It is one of the widely used structural systems in tall buildings today. In recent years, scholars at home and abroad have done a lot of research on short-leg shear wall structures, and some valuable research results have been obtained. However, most of the research contents focus on the shear resistance and seismic behavior of short-leg shear wall structures under horizontal loads. There are few studies on the mechanical behavior of short-leg shear wall structures under vertical load using the integral structural model. In this paper, two methods, model test and finite element numerical analysis, are used to apply vertical uniform load to the short-leg shear wall structure and the "T" joint model composed of wall beams. To study the behavior and deformation of structures and joints under vertical load, the following work has been accomplished: 1. Taking the short leg shear wall structure as the background in an actual project, the three-story structure near the top floor is selected for simplification. Based on the similarity principle of structural model test, a three-story two-span short-leg shear wall structural test model was developed according to the scale of 1:4 scale. The static test of the structural model under vertical load is carried out by using the surcharge method. In this paper, the deformation and stress of the short leg shear wall structure and the joint are analyzed, and the mechanical behavior of the short leg shear wall structure with strong lateral resistance under vertical load is preliminarily understood, which provides the basis for further research. The experimental results show that the deformation characteristics of cast-in-place concrete short-leg shear wall structure are close to that of frame structure. Under the action of vertical uniform load, the cast-in-place concrete short-leg shear wall structure has a better bearing capacity, and the connection between beam and short-leg shear wall is the weak area of the short-leg shear wall structure. The area of the joint of the wall limb is in the state of composite compression and bending force. The spatial model is exactly the same as the structural test model established by using ANSYS finite element software. The rationality of the ANSYS finite element model is verified by comparing the finite element calculation results with the experimental results. The stress distribution and crack development of the short leg shear wall structure system from the beginning of the stress to the final failure are analyzed. Combined with the stress cloud diagram of joint area under vertical load and related data, this paper describes the stress process of short leg shear wall joint under vertical load, and the failure mechanism. The "T" joint model is established by ANSYS finite element software. The deformation, crack development and stress and strain of the joint model under vertical uniform load are analyzed. According to the concrete strength grade, the reinforcement ratio of the longitudinal reinforcement of the wall limb, The reinforcement ratio of stirrups is used as a parameter to quantitatively study and analyze the influence of each parameter on the compression bearing capacity and crack resistance of short leg shear wall joints. Finally, the checking formulas of dangerous section of short leg shear wall joints under vertical load in the core area are summarized. Based on the related data and the analysis of the mechanical behavior of the short leg shear wall structure under vertical load, this paper summarizes some common problems in the design of the short leg shear wall structure, and puts forward corresponding suggestions for improvement.
【学位授予单位】：湖南工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU398.2
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