外加预制圈梁构造柱提升砌体结构整体抗震性能研究

发布时间：2018-06-20 03:58

本文选题：砌体结构 + 预制圈梁构造柱　；参考：《东南大学》2015年硕士论文

【摘要】：砌体结构以其取材方便、施工工艺简单、造价低廉的特点,在我国特别是在村镇地区得到了广泛的应用。砌体结构虽然抗压强度高,但是抗拉抗剪强度低,整体性差,再加上很多砌体房屋在建造时没有考虑抗震设防或设防标准低,在历次地震中震害特别严重,造成大量财产和生命的损失。我国的砌体房屋面广量大,将其全部拆除重建不符合我国国情,只有对其进行抗震加固才能避免更多的财产损失和生命伤亡。研究表明,采用外加圈梁构造柱加固砌体结构能有效提高砌体结构的整体性和抗震性能,是非常有效的加固方法。然而,目前外加圈梁构造柱采用的是现浇形式,施工时需要现场支模浇筑混凝土,存在施工复杂、湿作业量大、工期长等缺点,不适合大规模用于砌体结构的抗震加固。鉴于此,响应建筑工业化的号召,提出采用预制圈梁构造柱加固的新技术。圈梁构造柱在工厂预制,运至现场拼装后采用粘结材料使之与墙体连为一体,从而达到施工方便快捷的目的。本文围绕外加预制圈梁构造柱加固砌体结构展开,主要研究内容和成果如下：(1)以施工方便快捷、绿色环保为原则,提出外加预制圈梁构造柱加固砌体结构技术,包括预制圈梁构造柱的做法,预制构件之间的连接做法及预制构件与墙体的连接做法,加固的施工流程等。(2)采用ABAQUS有限元软件进行加固效果的数值模拟研究。首先通过查阅文献,探索出一种适合本文砌体结构数值模拟的方法,并进行了验证。接着,建立了5个四层砌体模型,包括2个未加固模型和3个加固模型,进行了模态分析和动力弹塑性时程分析。模态分析表明采用预制圈梁构造柱加固后模型的振型基本一致,纵横墙方向的刚度提高。动力弹塑性时程分析表明采用预制圈梁构造柱加固后结构的变形变小,但墙体承担的剪力变化较小,圈梁构造柱的作用主要是约束墙体变形,尤其对底层的约束效果比较显著。(3)为验证本文提出的预制圈梁构造柱加固技术的可行性,选择了8栋房屋进行试点应用。通过试点应用,初步验证了这项新技术的可行性,基本达到了施工方便快捷、绿色环保的设计目的。最后针对现场施工情况,提出了一些问题和改进建议。
[Abstract]:Masonry structure is widely used in our country, especially in villages and towns, because of its advantages of convenient material collection, simple construction technology and low cost. Although masonry structures have high compressive strength, the tensile and shear strength is low and the integrity is poor. In addition, many masonry buildings do not consider seismic fortification or have low standards when they are built, so the earthquake damage is especially serious in previous earthquakes. The loss of a great deal of property and life. The masonry buildings in our country have a large area, so it is not suitable for our country to demolish them and rebuild them completely. Only by strengthening them against earthquake can we avoid more property loss and life casualties. The study shows that the reinforcement of masonry structure with ring beam structure column can effectively improve the integrity and seismic performance of masonry structure and is a very effective method of strengthening masonry structure. However, at present, the cast-in-place form is used in the construction of additional ring beam structure columns, and it is necessary to place concrete in the field by supporting formwork during construction, which has the disadvantages of complex construction, large wet work capacity, long construction period, and is not suitable for large-scale seismic reinforcement of masonry structures. In view of this, in response to the call of building industrialization, a new technique for reinforcement of precast ring beams and columns is put forward. The construction column of ring beam is prefabricated in the factory, and the bonded material is used to connect it with the wall after being assembled to the site, so that the construction is convenient and quick. The main research contents and results are as follows: (1) based on the principle of convenient construction and green environmental protection, this paper puts forward the reinforcement technology of masonry structure with precast ring beam structure column. The numerical simulation of reinforcement effect is carried out by using Abaqus finite element software, including the precast ring beam construction column, the connection between prefabricated members and wall, the construction process of reinforcement and so on. Firstly, a method suitable for numerical simulation of masonry structure in this paper is explored and verified by consulting literature. Then, five four-story masonry models are established, including two unstrengthened models and three reinforcement models. Modal analysis and dynamic elastic-plastic time-history analysis are carried out. The modal analysis shows that the mode of the model is basically the same and the stiffness of the vertical and transverse wall is improved. The dynamic elastic-plastic time history analysis shows that the deformation of the structure strengthened with precast ring beam column becomes smaller, but the shear force of the wall is small, and the effect of the ring beam structure column is mainly to restrain the deformation of the wall. In order to verify the feasibility of the precast ring beam structural column reinforcement technology proposed in this paper, 8 houses were selected for pilot application. The feasibility of the new technology has been preliminarily verified through the application of the pilot project, and the design purpose of construction convenience and environmental protection has been basically achieved. Finally, some problems and suggestions for improvement are put forward in view of the construction situation on the spot.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU364;TU352.11

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