【作者】 徐杰年；

【导师】 李青宁；

【作者基本信息】 西安建筑科技大学 ， 结构工程， 2005， 硕士

【摘要】 短肢剪力墙是近年来在我国兴起的一种新型的抗侧力体系,已经在我国多、高层建筑中得到了广泛应用。但由于目前对它的研究不充分,还没有一套完整的设计理论和方法来指导工程设计。因此,系统地研究短肢剪力墙结构的力学性能、破坏形态已成为工程设计中迫切需要解决的课题。 论文根据计算机仿真原理的基本思路,运用有限元原理对T形单层和高层短肢剪力墙抗侧力体系进行了拟静力模拟试验。试验采用24个自由度的空间八结点块体单元,钢筋弥散于混凝土中的整体式模型,建立了短肢剪力墙空间分析有限元模型,运用空间非线性有限元方法进行计算机仿真分析和计算。 论文分析了单层短肢剪力墙的基本受力性能。在拟静力试验中分别考虑了影响短肢剪力墙受力的四种因素:墙肢截面高厚比、混凝土强度等级、连梁跨高比、轴压比等因素对短肢剪力墙承载力和变形的影响。试验结果表明:墙肢截面高厚比对承载力和变形的影响较为明显,随着墙肢高厚比增加,其开裂和极限荷载会增加,但其最大位移首先增加然后减小。综合考虑各种因素,截面高厚比在6.5左右时,承载能力和变形能力较高。 论文对短肢剪力墙截面正应力和剪应力分布规律进行了深入细致的探讨,结果表明:翼缘正应力分布曲线基本上符合三次抛物线形状分布,腹板上的剪力流呈反对称分布。由于短肢剪力墙结构存在剪力滞后效应,结构承载力有所降低。 论文进行了一榀高层双肢短肢剪力墙结构体系在单调加载情况下的仿真分析。对肢长与肢厚比、轴压比、连梁刚度、楼层层数等参数不同的短肢剪力墙进行了弹塑性分析。探讨这些参数对短肢剪力墙弹塑性性能的影响,并分析了其在单调加载情况下的荷载—侧移曲线,研究了短肢剪力墙结构的承载和变形能力。通过一个短肢剪力墙结构的分析,给出结构的荷载—位移曲线,描述结构从开始加载一直到结构破坏的全过程,并为短肢剪力墙结构的设计提出了建议。更多还原

【Abstract】 Short-leg shear wall is a new type system to resist lateral load acted on buildings, which springing up in China in the recent years. It is widely used in the middle or high-rise buildings, However, there are no complete theories available to guide the design of this type due to the lack of research on it. Therefore, the exigent problems to resolve in the design of it are complete research of the mechanichal behaviours, failure patterns.Based on computer simulation theory and finite element analysis method, the static experiment in simulation test was done on T-shaped one-story and high-rise system to resist lateral load of short-leg shear wall. In simulation analysis, a spatial block unit that has eight nodes and 24 degrees of freedom and the integerate model of steel bar smear the concrete, composes finite element model, and spatial non-linear finite element analysis method is adopted to calculate to reveal the basic mechanical property of short-leg shear wall.In static test, T-shaped specimens were respectively divided into four groups according to sectional deepth to thickness ratio, concrete strength grades, couple beams spain to deepth ratio, ratio of axial compressive force to axial compressive ultimate capacity of section . How these factors affect the load-carrying and deformation of short-leg shear wall is analysed. The anlysis shows that the crack moment and ultimate moment are heaved, and the deformation capacity curve firstly rises then goes down with the increasement of the sectional deepth to thickness ratio. The load-carrying and deformation capacity is relatively high when the sectional deepth to thickness ratio is 6.5 or so.The sectional stress distribution is deeply and detailedly researched. The result shows that the normal stress distribution is according to cubic curve and shear stress of the web plate is antisymmetric.The experiment of short-leg shear wall subject to lateral load is implemented. Using FEA program ANSYS, the elastic-plastic analysis is done on different short-lag shear wall by changingthe sectional deepth to thickness ratio, buildings stories, couple beams spain to deepth ratio, ratio of axial compressive force to axial compressive ultimate capacity of section. Load-displacement curve of structure is analysed subject to static load. The mechanical performance of the short-leg shear wall structure is researched and the failing process of it is described by the load-displacement curve of the top, moreover, some suggestions are prensented for the design of short-leg shear wall structure.更多还原