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钢筋混凝土框架结构依靠梁板组成的楼盖系统来抵抗连续倒塌,其在小变形下的连续倒塌抗力由梁板内的压拱机制提供。现有压拱机制的宏观理论分析模型参数过多且不能考虑楼板的影响,因此难以在工程设计中进行应用。该文基于楼盖系统微观受力机理的分析,建立了压拱机制下梁板子结构系统的连续倒塌抗力分析模型。和现有模型相比,该文计算模型的参数大幅减少、公式显著简化,且能够考虑楼板和梁抵抗连续倒塌的共同作用。通过与国内外47个梁试件和6个梁板子结构试件的试验结果进行对比,发现该文计算模型在计算梁试件时计算精度和现有模型精度相同,而在计算梁板共同作用下的连续倒塌抗力时精度提高显著,能够为混凝土框架结构的抗连续倒塌工程设计提供参考。
Reinforced concrete frame structure relies on the floor system consisting of beams to resist continuous collapse. Its continuous collapse resistance under small deformation is provided by the compression mechanism in the slab. The macroscopic theoretical analysis model of the existing camber mechanism has too many parameters and can not consider the influence of the floor, so it is difficult to apply in the engineering design. Based on the analysis of microscopic mechanical mechanism of the floor system, a continuous collapse analysis model of beam-slab substructure system under the compression arch was established. Compared with the existing model, the parameters of this computational model are greatly reduced, the formula is simplified, and the joint action of floor and beam resisting continuous collapse can be considered. By comparing with the test results of 47 beam specimens and 6 beam specimen structures at home and abroad, it is found that the calculation accuracy of this calculation model is the same as that of the existing models when calculating the beam specimen. However, Under the continuous collapse resistance significantly improve the accuracy, and can provide a reference for anti-continuous collapse of the concrete frame structure design.