楼盖弱连接结构设计方法探讨
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摘要
现有规范对弱连接楼盖的计算及措施论述不多,但该类型平面有一定的市场需求,有必要进行专门研究。基于规范对梁、墙等构件的抗剪验算公式,反算弱连接部位楼板的最小厚度,使得该部位的楼板截面能满足罕遇地震抗剪弹性的性能目标。通过对比分析,弱连接部位梁的抗弯刚度和轴向刚度对协调各分肢的受力具有关键性作用,应采取加强措施保证梁的刚度防止结构发生连续倒塌。设定弱连接部位梁满足设防地震抗弯弹性的性能目标,手动复核设防地震作用下梁不会出现全截面开裂及加强梁的锚固条件等,可以保证弱连接结构的受力安全。
There is a certain market demand for the construction plan of weak connection floor, but the existing codes have no corresponding calculation and measures for this kind of structure, and special research is necessary. The minimum thickness of the floor slab with weak connection was determined by shear checking formula for beam and wall based on code, so that the floor section of the site can satisfy the performance target of shear elasticity of rare earthquake. Through comparative analysis, the flexural stiffness and axial stiffness of the beam with weak connections are critical to the coordination of the various branches. Measures should be taken to ensure the stiffness of the beam to prevent the progressive collapse of the structure. Set the beam of the weak joint to meet the performance goal of flexural elasticity under moderate earthquake. Manually check the beam without full-section cracking under moderate earthquake, and strengthening the anchoring conditions of the beam, etc. The safety of the weak connection structure can be ensured.
There is a certain market demand for the construction plan of weak connection floor, but the existing codes have no corresponding calculation and measures for this kind of structure, and special research is necessary. The minimum thickness of the floor slab with weak connection was determined by shear checking formula for beam and wall based on code, so that the floor section of the site can satisfy the performance target of shear elasticity of rare earthquake. Through comparative analysis, the flexural stiffness and axial stiffness of the beam with weak connections are critical to the coordination of the various branches. Measures should be taken to ensure the stiffness of the beam to prevent the progressive collapse of the structure. Set the beam of the weak joint to meet the performance goal of flexural elasticity under moderate earthquake. Manually check the beam without full-section cracking under moderate earthquake, and strengthening the anchoring conditions of the beam, etc. The safety of the weak connection structure can be ensured.
引文
[1] 高层建筑混凝土结构技术规程:JGJ 3—2010[S].北京:中国建筑工业出版社,2011.
[2] 混凝土结构设计规范:GB 50010—2010[S].北京:中国建筑工业出版社,2011.
[2] 混凝土结构设计规范:GB 50010—2010[S].北京:中国建筑工业出版社,2011.