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为了研究现浇混凝土框架设置楼梯结构的抗震性能,采用1/2缩尺试件,进行框架楼梯间结构单元的拟静力试验。试验得到了试件整体及各部分的具体破坏过程和相互关系,实测了承载力、各部位变形,以及其他抗震性能指标,分析了结构的工作机理。试验结果表明:楼梯与框架采用通常构造方式整体连接时,楼梯部分作为不对称斜撑参与承受侧向荷载,受力后首先开裂,且破损发展迅速,使其难以可靠发挥救援、疏散等功能;楼梯的作用也造成楼梯间框架构件的不均匀受力,导致一侧框架柱发生脆性破坏,引起试件整体失效;试件实测的滞回曲线面积较小,破坏荷载大,峰值荷载后承载力快速下降;半层平台梁与框架柱采用刚接,使该处框架柱成为短柱,且受力状态复杂,致使其突然破坏,其他部位也很快破坏,采用这种整体连接方式的框架楼梯对结构抗震不利。
In order to study the seismic performance of cast-in-site concrete structures with stair structures, 1/2 scale test specimens were used to simulate the static behavior of the structural elements of the staircase. The specific damage process and the relationship between the whole specimen and each part of the specimen were obtained through experiments. The bearing capacity, the deformation of each part and other seismic performance indexes were measured. The working mechanism of the structure was analyzed. The test results show that when the staircase and the frame are integrally connected by the usual construction method, the staircase part participates in the lateral load as an asymmetrical bracing, which will crack first after being subjected to force and the damage is rapidly developed, making it difficult to give full play to rescue and evacuation functions. Staircase also caused by the role of non-uniform force of the staircase frame components, resulting in brittle failure of one side of the frame column, causing the overall failure of the specimen; specimen measured hysteresis curve is smaller, the damage load is large, the peak load bearing capacity The first half of the platform beams and the frame column using the first connection, so that the frame column as a short column, and the stress state is complex, resulting in its sudden destruction, other parts also quickly destroyed, using this overall connection framework of the stairs Seismic anti-seismic structure.