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针对大悬挑后张有粘结空间预应力混凝土结构体系展开研究。通过在某音乐厅底部和顶部的大悬挑梁及大悬挑端部的梁上立柱中施加后张有粘结预应力,构建了空间预应力体系,辅以音乐厅两侧的混凝土伸臂桁架,实现了22m的大悬挑,其自振特性分析表明大悬挑区域刚度较高。然后通过施工顺序分析,明确了大悬挑区域全部施工完毕后拆模的方法可以使构件受力更加合理、设计更加经济,且中震下设定的结构关键构件抗震性能目标均能得到满足。最后,通过整体模型振动台试验验证了结构的安全性。
Aiming at the prestressed concrete structure system with large cantilevered sheets, The space prestressed system was constructed by applying post-tensioned prestressing to beams on the cantilever beams at the bottom and top of a concert hall and the uprights of the cantilevered ends, Truss, to achieve a large cantilever 22m, its natural vibration analysis shows that the large cantilevered area higher stiffness. Then through the analysis of construction sequence, it is clear that the method of disassembly after the whole construction of the large cantilevered area is completed can make the components more reasonable and more economical in design, and the seismic performance targets of the key components of the structure set under moderate earthquake can be met. Finally, the structural safety is verified by shaking table test of the overall model.