【摘要】：短肢剪力墻是一種介于異形柱和剪力墻之間的抗側(cè)力構(gòu)件,它組成的短肢剪力墻結(jié)構(gòu)結(jié)合了框架結(jié)構(gòu)和剪力墻結(jié)構(gòu)的優(yōu)點(diǎn),由于沒有像框架結(jié)構(gòu)那樣室內(nèi)存在凸出墻面的柱,非常適用辦公樓和商業(yè)住宅建筑,是現(xiàn)今的高層建筑結(jié)構(gòu)中廣泛運(yùn)用的結(jié)構(gòu)體系之一。近年來,國內(nèi)外學(xué)者對短肢剪力墻結(jié)構(gòu)進(jìn)行了大量研究,得到了一些有價(jià)值的研究成果,但研究內(nèi)容大多側(cè)重于短肢剪力墻結(jié)構(gòu)在水平荷載作用下的抗剪和抗震性能,利用整體結(jié)構(gòu)模型對短肢剪力墻結(jié)構(gòu)在豎向荷載作用下受力性能的研究較少。本文結(jié)合模型試驗(yàn)與有限元數(shù)值分析兩種方法對短肢剪力墻結(jié)構(gòu)和由墻梁組成的“T”型節(jié)點(diǎn)模型施加豎向均布荷載,來研究結(jié)構(gòu)和節(jié)點(diǎn)在豎向荷載作用下的受力性能和變形特性,主要完成了以下工作:1、以一個(gè)實(shí)際工程中的短肢剪力墻結(jié)構(gòu)為背景,選取靠近頂層附近的三層結(jié)構(gòu)進(jìn)行簡化,結(jié)合結(jié)構(gòu)模型試驗(yàn)的相似性原理,按照1:4的縮尺比例制作了一個(gè)三層兩跨短肢剪力墻結(jié)構(gòu)試驗(yàn)?zāi)Ｐ�。用堆載法模擬均布荷載對結(jié)構(gòu)模型進(jìn)行豎向荷載作用下的靜力試驗(yàn)。分析短肢剪力墻結(jié)構(gòu)及節(jié)點(diǎn)的變形和受力情況,初步了解這種抗側(cè)能力較強(qiáng)的短肢剪力墻結(jié)構(gòu)在豎向荷載作用下的受力性能,為后續(xù)研究提供依據(jù)。試驗(yàn)表明:現(xiàn)澆混凝土短肢剪力墻結(jié)構(gòu)的變形特征與框架結(jié)構(gòu)接近。在豎向均布荷載作用下,現(xiàn)澆混凝土短肢剪力墻結(jié)構(gòu)呈現(xiàn)出較好的承載能力,連梁與短肢剪力墻連接處為短肢剪力墻結(jié)構(gòu)的薄弱區(qū)域,墻肢節(jié)點(diǎn)區(qū)域呈現(xiàn)壓彎復(fù)合受力狀態(tài)。2、運(yùn)用ANSYS有限元軟件建立與結(jié)構(gòu)試驗(yàn)?zāi)Ｐ屯耆嗤目臻g模型,將有限元計(jì)算結(jié)果與試驗(yàn)結(jié)果對比,驗(yàn)證了ANSYS有限元模型的合理性,并分析了短肢剪力墻結(jié)構(gòu)體系從受力開始至最終破壞的整個(gè)過程結(jié)構(gòu)的應(yīng)力分布和裂縫發(fā)展。結(jié)合節(jié)點(diǎn)區(qū)域在豎向荷載作用下的應(yīng)力云圖以及相關(guān)資料,描述了短肢剪力墻節(jié)點(diǎn)在豎向荷載作用下的受力過程、破壞機(jī)理。3、通過ANSYS有限元軟件建立“T”型節(jié)點(diǎn)模型,分析節(jié)點(diǎn)模型在豎向均布荷載作用下節(jié)點(diǎn)模型的變形情況、裂縫開展和鋼筋應(yīng)力應(yīng)變情況。以混凝土強(qiáng)度等級、墻肢縱筋配筋率、墻肢箍筋配筋率為參數(shù)來定量的研究分析各參數(shù)對短肢剪力墻節(jié)點(diǎn)抗壓承載能力和抗裂能力的影響。4、總結(jié)了短肢剪力墻節(jié)點(diǎn)核心區(qū)豎向荷載作用下危險(xiǎn)截面的驗(yàn)算公式。結(jié)合相關(guān)資料以及前文對短肢剪力墻結(jié)構(gòu)在豎向荷載作用下的受力性能的分析,總結(jié)了短肢剪力墻結(jié)構(gòu)設(shè)計(jì)的常見幾個(gè)問題,并提出了相應(yīng)的改進(jìn)建議。
[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.
【學(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU398.2

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