Progressive collapse mechanism of PC beam-slab substructure with bolted connections

被引：0
|
作者：
Qian K. [1 ]
Li Z. [1 ]
He P. [1 ]
Wu G. [2 ]
机构：
[1] School of Civil Engineering and Architecture, Guangxi University, Nanning
[2] National Research Center for Prestressed Engineering Technology, Southeast University, Nanjing
来源：
Jianzhu Jiegou Xuebao/Journal of Building Structures | 2020年 / 41卷 / 01期
关键词：
Beam-slab substructure; Bolted connection; Finite element analysis; Load resisting mechanism; Precast concrete; Progressive collapse;
D O I：
10.14006/j.jzjgxb.2018.0497
中图分类号：
学科分类号：
摘要：
To study the performance of PC structures with bolted connections to resist progressive collapse, a one-third scaled two-bay PC beam-slab substructure with bolted connections was constructed. The crack pattern and load resisting function of the PC substructure were investigated by using the combined method of equivalent uniform distributed weights and Pushdown approach. The test results indicate that the PC substructure with bolted connections presents sufficient ductility during the test. In the beginning of the test, the load resistance of the substructure is mainly attributed into the flexural capacity from the beams and slabs. Different with conventional RC substructures, no effective compressive arch action is developed in the PC beams to resist collapse. The PC beams may quit their work due to the concrete tearing failure around the bolted connection. However, the activation of membrane action in wire mesh of the topping layer allows the substructure to further resist load and prevent its premature collapse. Relied on the finite element models, which are generated by commercial software LSDYNA, the load resistance from the beams and slabs of the PC substructure is decomposited. It is found that in the beginning of the test, the PC slab with cast-in-situ topping layer contributes the load resistance by up to 87%. Due to tensile membrane action developed in the topping layer, PC slab and the topping layer can contribute the resistance by 72% in large deformation stage. © 2020, Editorial Office of Journal of Building Structures. All right reserved.
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页码：173 / 180
页数：7
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