不同配筋短连梁地震作用下的力学性能研究

发布时间：2018-05-29 15:40

本文选题：不同配筋 + 短连梁　；参考：《西安工业大学》2017年硕士论文

【摘要】：高层建筑中剪力墙连梁是抗震设防的第一道防线,是保证建筑结构地震作用下整体安全性的重要部位,对结构安全至关重要。短连梁通常指跨高比小于2.5的连梁,按照"强墙弱梁"的结构设计原则,其强度、刚度和变形性能对联肢剪力墙的抗震性能有很大影响。《混凝土结构设计规范》(GB50010-2010)和《高层建筑混凝土结构技术规程》(JGJ3-2010)只粗略提出了三种设计概念,并未说明其抗震性能。为了详细研究短连梁在地震作用下的受力状态,本文共设计了3个不同配筋短连梁,分别为对角暗撑配筋、集中对角配筋、交叉斜向配筋,利用有限元软件模拟了短连梁在周期循环荷载作用下的加载试验,通过研究三种不同配筋短连梁的裂缝发展情况、荷载-位移滞回曲线以及钢筋的应变分布规律,具体分析了三种不同配筋情况下短连梁的相关抗震性能。研究表明:本文所设计的三种不同配筋形式短连梁根据裂缝开展趋势判断,都依次经历弯曲破坏、剪切破坏、弯曲剪切破坏3个阶段。三种短连梁在地震作用下以剪切变形为主,符合"强剪弱弯"的原则,且剪切区域主要集中在跨中位置,有良好的抗震性能。箍筋发挥的抗剪能力不起主导作用,斜向钢筋基本处于全长受拉,承担大部分抗剪作用。对角暗撑配筋短连梁和集中对角配筋短连梁在梁腹形成类似交叉暗柱的作用,有效提高了承载力:交叉斜筋配筋短连梁较其他两种短连梁滞回环饱满,延性和耗能能力都是最好,刚度退化较为均衡,结构依靠自身的塑性变形从而减轻震害的能力较好。
[Abstract]:The shear wall continuous beam in high-rise buildings is the first line of anti-seismic fortification. It is an important part of ensuring the overall safety of the building structure under the earthquake action. It is very important for the structural safety. The short beam usually refers to a continuous beam with a span height ratio less than 2.5. The seismic performance has great influence. < concrete structure design specification > (GB50010-2010) and < high building concrete structure technical specification > (JGJ3-2010) only roughly put forward three kinds of design concepts, which did not explain their seismic performance. In order to study the stress state of short beams under the earthquake action, 3 different reinforced short beams were designed in this paper. Not for diagonal dark bracing, concentrated diagonal reinforcement and cross oblique reinforcement, the loading test of short beams under cyclic cyclic loading is simulated by finite element software. Through studying the crack development of three different reinforced short beams, the load displacement hysteretic curve and the strain distribution law of steel bars are studied, and three different kinds of matching are analyzed. The relative seismic performance of short beams under the condition of reinforcement shows that the three different reinforcement form short beams designed in this paper are judged by the trend of crack development according to the trend of crack development, and all of them have 3 stages of bending failure, shear failure and bending shear failure in turn. The three kinds of short beams are mainly shear and shear deformation under the action of earthquake, which are in line with the principle of "strong shear and weak bending". The shear zone is mainly concentrated in the middle span, and has good anti-seismic performance. The shear ability of the stirrup can not play the leading role. The oblique reinforcement is basically stretched in length and bears most of the shear action. The effect of the short continuous beam on the angular brace reinforcement and the concentrated diagonal reinforcement short beam in the beam abdomen can effectively improve the bearing capacity. Compared with the other two kinds of short continuous beams, the short continuous beam with cross skew reinforcement is full, the ductility and energy dissipation are best, the stiffness degradation is more balanced, and the structure depends on its own plastic deformation to reduce the damage to the earthquake.
【学位授予单位】：西安工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU973.31

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