论文部分内容阅读
底框砖房是指底部一层全部或部分结构体系采用钢筋混凝土框架、上部多层采用砌体结构的混合结构体系.5.12汶川大地震灾区该类建筑应用非常广泛.基于灾区广泛的调查成果,分类总结了汶川地震中底框砖房的主要震害特征,即部分底框砖房表现出很差的抗震性能;过渡层普遍破坏严重甚至于完全坍塌;上部砌体整体相对于底部框架发生水平滑动.研究表明,过渡层的工作机理非常复杂,地震中的实际受力情况与设计所采用的受力状态有明显的区别,建议在现行规范要求的基础上提高过渡层的强度和延性要求;现行抗震规范对底框和上部砌体层刚度比的规定对于提高底框砖房的抗震性能具有重要意义,建议进一步考虑砌体和钢筋混凝土材料的不同力学性质来制定上下层刚度比范围;底框和上部砌体结构之间的可靠连接是保证底框砖房整体工作的前提;严格按现行抗震规范设计和施工的底框砖房能获得良好的抗震性能;部分底框砖房因其混杂的结构体系不利于抗震,建议在抗震设防地区禁止使用.
Bottom frame brick house refers to the bottom layer of all or part of the structure of the system using reinforced concrete frame, the upper multi-layer structure of the mixed structure of masonry .5.12 Wenchuan earthquake disaster area of this type of building is widely used.Based on a wide range of disaster areas survey results, The paper summarizes the main seismic damage characteristics of the middle brick houses in the Wenchuan earthquake, that is, some of the bottom brick houses exhibit poor seismic performance; the transitional floors are generally damaged seriously or even completely collapsed; the upper masonry as a whole is horizontal to the bottom frame The study shows that the working mechanism of the transitional layer is very complicated, the actual stress in the earthquake is obviously different from the stress state used in the design, and it is suggested to improve the strength and ductility requirements of the transitional layer on the basis of the current normative requirements. Stiffening ratio of bottom frame and upper masonry is of great significance to improve the seismic performance of bottom brick. It is suggested to further consider the different mechanical properties of masonry and reinforced concrete materials to develop the upper and lower stiffness ratio range; the bottom The reliable connection between the frame and the upper masonry structure is a prerequisite to ensure the overall work of the brick frame house; strictly according to the existing resistance Standard design and construction of the bottom frame brick can get a good seismic performance; portion of the bottom box brick structure because of its hybrid system is not conducive to the earthquake, the proposed ban on the use in seismic areas.