预制钢筋混凝土墙板加固砌体结构的抗震性能研究

发布时间：2018-01-02 14:09

本文关键词：预制钢筋混凝土墙板加固砌体结构的抗震性能研究　出处：《中国地震局工程力学研究所》2014年硕士论文　论文类型：学位论文

【摘要】：砌体作为一种历史悠久的建筑材料，被广泛应用于我国的基础建设中。而现存的砌体建筑存在着一些问题，一方面，老旧砌体结构建造年代久远，难以满足现行的抗震规范要求；另一方面，自建砌体结构大多没有经过正规的抗震设计，其结构布置随意，，构造形式多样，不能满足抗震需求。因而有必要对既有砌体建筑的破坏机理和加固维修对策进行研究。本文通过试验研究了既有砌体结构的破坏机理，并采用预制钢筋混凝土墙板加固法对既有墙片进行加固，研究加固后砌体结构的抗震性能，主要研究内容如下：首先，通过对芦山地震中砌体结构建筑震害的分析，系统总结了砌体结构这一量大面广建筑的破坏形式，从抗震构造措施的随意性、结构竖向不规则、墙体尺寸不合规和地基基础处理不完善四个方面总结了砌体结构破坏的原因。通过对加固后砌体结构的震害调查，发现加固后的砌体结构建筑震害较轻，仅有少数构件破坏。其次，通过试验材料的基本力学性能试验，研究了砌体材料的破坏特征和破坏机理，从而得到了各材料的力学性能。为研究加固构件各部分之间的粘结情况，设计了两种粘结试验，分别得到了灌浆措施和后浇带措施的粘结性能。第三，设计和制作了8个墙片试件并进行拟静力试验。4个为砌体墙片，用于研究砌体结构的破坏机理、分析构造措施对砌体破坏机制的影响。其余4个为预制钢筋混凝土墙板加固后的墙片，通过对其进行拟静力试验，研究加固墙片的破坏机理和抗震性能。试验证明：采用预制钢筋混凝土墙板加固方法可以有效实现预制钢筋混凝土墙板与砖墙的共同工作，并提高砌体墙的抗震能力和受剪承载力，其中承载力的提高可达2-5倍。第四，利用非线性有限元软件MSC.Marc分析了未加固砌体及加固砌体结构在循环往复加载下的力学行为，探讨混凝土墙板和砌体砖墙之间的传力机理，验证加固方法和三种连接措施的有效性。分析证明：采用预制钢筋混凝土的加固方案可以显著提高砌体结构的抗震性能，三种连接方式中，后浇带最有效，在弹性阶段传递了70%的荷载，在后期传递了80%的荷载。最后，在试验研究的基础上，通过已有的公式对未加固墙体进行计算。同时，提出了加固墙体的承载力计算公式，计算公式的预测值与实际值吻合较好，可用于预制钢筋混凝土墙板加固砌体结构的设计和计算。
[Abstract]:Masonry structure has a long history as a building material, infrastructure construction has been widely used in our country. And the existing masonry buildings exist some problems, on the one hand, the old masonry structure construction began, it is difficult to meet the current seismic code requirements; on the other hand, self built masonry structure mostly without normal aseismic design, the structure layout free structure forms, can not meet the seismic demand. So it is necessary to study the failure mechanism of existing masonry building and strengthening maintenance measures.
In this paper, the failure mechanism of existing masonry structures is studied through experiments, and the precast reinforced concrete wall reinforcement method is adopted to reinforce the existing walls, and the aseismatic performance of masonry structures after reinforcement is studied. The main contents are as follows:
First of all, through the analysis of masonry structures in Lushan earthquake, summarized the failure form of the amount of masonry structure large buildings, from the anti-seismic measures of randomness, irregular vertical structure, wall size and irregular foundation treatment is not perfect in four aspects summarizes the causes of masonry structural damage. Based on the investigation on the seismic damage of masonry structure reinforcement, found damage masonry structure after reinforcement is light, only a few component damage.
Secondly, the basic mechanical properties of test materials, the failure characteristics and failure mechanism of masonry materials, so as to obtain the mechanical properties of the material. For the study of reinforcement bond between each components, two kinds of adhesive were obtained by experimental design, bonding performance measures and measures of pouring slurry.
Third, the design and fabrication of 8 wall specimens and quasi static test for.4 masonry walls, used for the study on failure mechanism of masonry structure, analysis of the impact of structural measures on the failure mechanism of masonry. The remaining 4 reinforcement for prefabricated reinforced concrete wall after wall, through the pseudo static test of the. The failure mechanism and seismic performance of reinforced masonry wall research. Experiments proved that the prefabricated reinforced concrete wall reinforcement method can effectively realize the common work of precast reinforced concrete and brick wall, and improve the seismic capacity of the masonry walls and shear capacity, the improvement of bearing capacity of up to 2-5 times.
Fourth, analysis of the mechanical behavior of unreinforced masonry and reinforced masonry structure in cyclic loading by nonlinear finite element software MSC.Marc to investigate the transfer mechanism between the concrete wall and brick masonry walls, verify the reinforcement method and three kinds of effective connectivity measures. Analysis of evidence: the reinforcement scheme of precast reinforced concrete can significantly improve the seismic the performance of masonry structure, three kinds of connection modes, post pouring belt is most effective in elastic stage passed 70% load, 80% load transfer in the late stage.
Finally, on the basis of experimental research, the unreinforced wall was calculated by the formula. At the same time, put forward the calculation formula of the bearing capacity of the strengthened walls, the prediction formula of value is in good agreement with the actual value, can be used for the design and calculation of masonry structure of precast reinforced concrete wall reinforcement.

【学位授予单位】：中国地震局工程力学研究所
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU364;TU352.11

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