既有砌体结构装配式楼屋盖抗震整体性能加固研究

发布时间：2018-09-12 13:42

【摘要】：随着建筑行业的快速发展,对建筑物抗震的要求越来越高,尤其早年的建筑已不能满足现在的规范要求,并且结构在长期的使用环境和自然环境的作用下,其功能性必然逐渐衰弱,必须要能够科学地评估结构损伤的程度和客观规律,并采取有效的措施保持结构能够继续安全的使用。因此,对建筑结构进行的抗震加固是必不可少的,就目前的形势而言,建筑结构的加固方法有外包钢加固法、增大截面法、预应力加固法、增设支点加固法、FRP片材加固法及粘钢加固法等,以上这些加固方法均属于对结构承载力不足的加固方法。早年的砌体结构楼屋盖多采用预制混凝土空心板结构,事实证明,在地震作用下发生的楼板破坏,较多的破坏原因并不是由于楼板的承载力不足导致损坏的,而是由于楼板平面内整体性能不足造成的楼板开裂、相互错动,甚至坍塌。本文针对这种情况提出一种新的预制板加固方法,使其具有较好的整体性,以提高楼板平面内抵抗地震作用的能力。假定楼层的质量集中在各层楼板标高处,连同上下各半层的墙体质量,简化为一个质点。砌体结构只考虑基本振型。因此,按倒三角形分布来考虑地震作用,可以采用基底剪力法来计算顶层水平地震作用,根据不同的抗震设防烈度来计算所需的加固钢板带。采用有限元软件ABAQUS进行模拟分析模拟,用未加固模型与加固后模型对比分析,验证加固方法的抗震能力的有效性;同时,对同一模型的遇不同地震作用下,抗震能力模拟分析。通过模拟分析,验证说明了本文的加固方法的有效性,对工程实际提供了理论依据。经模拟分析,加固后的预制板在遭遇抗震设防烈度的地震作用后,没有发生较大的相互错位现象,保持着良好的整体性,模拟结果数据真实准确。此种加固方法操作简便,受力可靠,现场湿作业少,是一种行之有效的加固方法,应广泛的运用到以后预制板的加固改造中去。
[Abstract]:With the rapid development of the construction industry, the requirements for building earthquake resistance are becoming higher and higher, especially in the early years of the building can no longer meet the requirements of the current code, and the structure in the long-term use of the environment and the role of the natural environment, Its function is bound to degenerate gradually, it must be able to scientifically evaluate the degree and objective law of structural damage, and take effective measures to keep the structure safe to use. Therefore, seismic reinforcement of building structures is essential. In the current situation, the reinforcement methods of building structures include steel reinforcement method, section reinforcement method, prestressed reinforcement method. The fulcrum reinforcement method, FRP sheet reinforcement method and steel bonding reinforcement method are added. These methods are not enough to strengthen the bearing capacity of the structure. In the early years, precast concrete hollow slabs were often used in masonry structures. It has been proved that the failure of floors under earthquake is not caused by the insufficient bearing capacity of floors. However, the floor is cracked, staggered and even collapsed due to the lack of overall performance in the floor plane. In this paper, a new prefabricated plate reinforcement method is proposed to improve the seismic resistance in the floor plane. It is assumed that the quality of the floor is concentrated at the elevation of each floor, and that the mass of the upper and lower half floors is reduced to a single particle. Masonry structures only consider basic modes. Therefore, considering the seismic action according to the inverted triangle distribution, the horizontal seismic action of the top floor can be calculated by the basement shear force method, and the reinforcing steel strip can be calculated according to the different seismic fortification intensity. The finite element software ABAQUS is used to simulate and compare the unstrengthened model with the reinforced model to verify the effectiveness of the seismic capacity of the reinforcement method. At the same time the seismic capacity simulation analysis of the same model is carried out under different earthquakes. The effectiveness of the reinforcement method is verified by simulation analysis, which provides a theoretical basis for engineering practice. Through simulation analysis, after the earthquake action of seismic fortification intensity, the reinforced prefabricated board does not occur a large mutual dislocation phenomenon, and maintains a good integrity, and the simulation results are true and accurate. This reinforcement method is a kind of effective reinforcement method, which is easy to operate, reliable in force and less wet in the field. It should be widely used in the reinforcement and transformation of prefabricated panels in the future.
【学位授予单位】：沈阳建筑大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU364;TU352.11

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