木框架土坯组合墙体抗震试验研究与分析

发布时间：2018-11-06 10:17

【摘要】：土坯建筑因其简便性和经济性,而在世界广泛存在,许多专家学者对其展开了研究。本文主要针对木框架土坯组合墙体的抗震性能进行研究分析,为村镇地区土坯房屋抗震加固与设计建造提供一些参考。首先对素土坯墙体与木框架土坯组合墙体进行拟静力试验,观察其破坏过程,总结墙体破坏模式;并通过试验结果得到承载力、延性系数、滞回曲线、骨架线、耗能曲线及刚度退化曲线等数据,研究分析试件的抗震性能。随后对各试验墙体进行有限元模拟,并对影响土坯墙体拟静力试验结果的因素行数值模拟计算分析,最后总结出组合墙体初始刚度及抗侧承载力计算公式。通过上述方法研究表明:(1)土坯墙体主要是受剪切破坏为主,木框架土坯组合墙体破坏分为:整体弹性工作阶段、土坯墙体受力阶段、协同工作阶段、木框架破坏四个阶段。组合墙体在承载力、变形能力及耗能等方面均优于素土坯墙体。(2)轴压比对土坯墙体破坏模式和抗侧承载力影响很大,不同轴压比下墙体出现不同破坏模式,随着墙体高宽比增大,轴压比的影响逐渐减弱。加载方式对土坯墙体拟静力试验结果的影响也不容忽视,L型加载梁的土坯墙体拟静力试验结果比较符合实际工程土坯墙体破坏模式。(3)墙片高宽比与木框架截面尺寸都是影响其抗侧能力的重要因素。提出木框架土坯组合墙体初始刚度与抗侧承载力简化计算公式,计算结果与有限元模拟结果接近。(4)将木框架设置在工字型墙体纵横墙连接处内部,会破坏墙体原有整体性,导致刚度退化加剧,承载力提升不明显。应将木框架设置在纵横墙连接处外侧,并使用钢丝网水泥砂浆加强连接与提高整体性。
[Abstract]:Adobe architecture is widely existed in the world because of its simplicity and economy. Many experts and scholars have studied it. In this paper, the seismic behavior of the composite wall of wood frame adobe is studied and analyzed, which provides some references for seismic reinforcement and design and construction of adobe buildings in villages and towns. Firstly, quasi-static test was carried out on the composite wall of plain adobe and wood frame adobe, the failure process was observed, and the failure mode of wall was summarized. The data of bearing capacity, ductility coefficient, hysteretic curve, skeleton line, energy dissipation curve and stiffness degradation curve are obtained. Then the finite element simulation of each test wall is carried out, and the factors influencing the pseudostatic test results of the adobe wall are numerically simulated and analyzed. Finally, the formulas for calculating the initial stiffness and lateral bearing capacity of the composite wall are summarized. The results show that: (1) the failure of the adobe wall is mainly caused by shear failure, and the failure of the composite wall is divided into three stages: the whole elastic working stage, the bearing stage of the adobe wall, and the cooperative working stage. The wooden frame is destroyed in four stages. The combined wall is superior to the plain adobe wall in bearing capacity, deformation ability and energy dissipation. (2) the axial compression ratio has a great influence on the failure mode and lateral bearing capacity of the adobe wall, and different failure modes appear in the wall under different axial compression ratio. As the aspect ratio of wall increases, the influence of axial compression ratio weakens gradually. The effect of loading mode on quasi-static test results of adobe wall can not be ignored. The pseudo-static test results of the adobe wall of L type loaded beam are in good agreement with the failure mode of the actual engineering adobe wall. (3) both the aspect ratio of the wall and the section size of the wood frame are the important factors affecting the lateral resistance of the wall. A simplified formula for calculating the initial stiffness and lateral bearing capacity of wood frame adobe composite wall is presented. The calculated results are close to the finite element simulation results. (4) the wood frame is located inside the junction of the I-shaped wall longitudinal and transverse walls. The original integrity of the wall will be destroyed, resulting in the deterioration of stiffness, and the increase of bearing capacity is not obvious. The wooden frame should be arranged on the outside of the joint of vertical and horizontal wall, and the wire mesh cement mortar should be used to strengthen the connection and improve the integrity.
【学位授予单位】：新疆大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11;TU398.9

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