具有预埋混凝土块形式抗剪键的叠合板的力学性能

发布时间：2018-03-01 20:51

本文关键词： 叠合板抗剪块有限元剪力荷载挠度曲线回归方程　出处：《沈阳建筑大学》2014年硕士论文　论文类型：学位论文

【摘要】：本文研究的对象是具有预埋混凝土块形式抗剪键的叠合板,简称带抗剪键的叠合板。这是一种新型的叠合板,它是由预制钢筋混凝土底板、预制混凝土抗剪键,和现浇钢筋混凝土叠合层组成,混凝土抗剪键预埋于预制底板中,与预制底板先构成一个整体构件,然后在浇筑现浇层时将混凝土浇至抗剪键的顶部或顶部以上,从而形成一个完整的叠合板。该叠合板通过抗剪键将预制混凝土底板与现浇混凝土层连接在一起,并且由抗剪键主要承担预制底板与现浇层两者之间的剪力与拉力,从而保证了板的整体性。本文主要对带抗剪键叠合板的力学性能进行了研究,在研究过程中根据边界条件的不同将带抗剪键的叠合板分为两类,一类是四边固端约束的叠合板,另一类是四边简支约束的叠合板。本文对这两种类型的叠合板采用相同的研究方法,其具体研究内容可以总结为以下几方面：(1)基于非线性有限元软件ABAQUS,建立了有限元模型对带抗剪键的叠合板进行数值分析。根据有限元软件计算得到的带抗剪键的叠合板的荷载挠度曲线,对带抗剪键叠合板的整个受力过程进行了分析,并结合抗剪块的剪力-荷载曲线分析得到了叠合板抗剪块的受力过程,总结得出了抗剪块所受剪力与其位置之间存在的规律；(2)从定性的角度分析了带抗剪键叠合板受力性能的三个主要影响因素：抗剪面积百分率、摩擦系数和长宽比,并针对每个影响因素设计了五块叠合板模型,通过对比荷载挠度曲线,分析得到了三个影响因素分别对叠合板的受力性能的影响特点；(3)从定量的角度分析了三个主要影响因素(抗剪块面积百分率、摩擦系数和长宽比)与受拉钢筋初屈服时所对应的跨中挠度之间的关系,通过数学回归的方法得到了它们之间的回归方程式,从而得到了它们之间的具体数量关系,最终得到了受拉钢筋初屈服时带抗剪键叠合板跨中挠度的计算公式；(4)通过改变三个影响因素的值,建立新的模型,对所得出的挠度计算公式进行验证,并根据验证结果,总结该回归方程的准确性,最终给出了受拉钢筋初屈服时带抗剪键叠合板跨中挠度计算公式的基本适用条件和影响因素的适用范围。
[Abstract]:The object of this paper is the laminated slab with shear bond in the form of embedded concrete block, which is referred to as the laminated slab with shear bond. This is a new type of composite slab, which is composed of precast reinforced concrete floor slab and prefabricated concrete shear bond. And the composite layer of cast-in-place reinforced concrete, in which the concrete shear key is embedded in the prefabricated floor, and the precast floor forms a whole member, and then the concrete is poured to the top or the top of the shear key when pouring the cast-in-place layer. Thus a complete composite plate is formed. The composite plate connects the precast concrete floor with the cast-in-place concrete layer through shear keys, and the shear key mainly bears the shear force and tensile force between the prefabricated floor and the cast-in-place layer. In this paper, the mechanical properties of laminated plates with shear bonds are mainly studied. According to the different boundary conditions, the laminated plates with shear bonds are divided into two categories, one of which is the laminated plate with four sides fixed end constraint. The other is the laminated plate with simply supported four edges. In this paper, the same research method is used for the two types of laminated plates. The specific research contents can be summarized as follows: 1) based on the nonlinear finite element software Abaqus, a finite element model is established for the numerical analysis of laminated plates with shear keys. Load deflection curve of composite plate, The whole stress process of the laminated plate with shear bond is analyzed, and the stress process of the laminated plate is obtained by combining the shear load-load curve of the shear block. The relationship between shear force and the position of shear block is summarized. (2) from the qualitative point of view, three main factors affecting the mechanical performance of laminated plate with shear bond are analyzed: the percentage of shear area, the friction coefficient and the ratio of length to width. Five composite plate models are designed for each factor, and the load deflection curves are compared. The influence characteristics of three factors on the mechanical properties of laminated plates are obtained. From the point of view of quantitative analysis, three main influencing factors (the percentage of shear block area) are analyzed. The relationship between the friction coefficient and the aspect ratio) and the deflection in the middle of the span corresponding to the initial yield of the tensile steel bar is obtained. The regression equation between them is obtained by mathematical regression method, and the specific quantitative relationship between them is obtained. Finally, the formula for calculating the mid-span deflection of laminated plate with shear bond at the initial yield of tensile steel bar is obtained. By changing the values of three factors, a new model is established, and the calculated formula of deflection is verified. The accuracy of the regression equation is summarized and the basic applicable conditions and the applicable range of influencing factors for calculating the mid-span deflection of laminated plates with shear bonds during the initial yield of tensile steel bars are given.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU375.2

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