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首页> 外文期刊>Journal of Performance of Constructed Facilities >Performance of Precast Concrete Substructures with Dry Connections to Resist Progressive Collapse
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Performance of Precast Concrete Substructures with Dry Connections to Resist Progressive Collapse

机译：具有干燥连接的预制混凝土亚结构的性能抵抗渐进式崩溃

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摘要

In the current study, three one-third scaled beam-slab substructures comprising a cast-in-place reinforced concrete specimen and two precast concrete (PC) specimens were tested under a pushdown loading regime to investigate the effects of connection types on the behavior of PC structures to mitigate progressive collapse. A special link was designed to enhance the connection between PC slabs and PC beams. The test results, including load-displacement curves, ultimate load capacity, ultimate deformation capacity, and local strains, are presented. The failure mode and mechanisms of load redistribution are further discussed. It is demonstrated that the PC specimen with welded connections achieved brittle failure with the lowest ultimate load capacity and deformation capacity. Although the lowest initial stiffness and first peak load capacity were achieved in the PC specimen with pinned connections, its large rotational ability ensured that the specimen failed in a ductile manner, which allowed the development of considerable tensile membrane actions. The main source of the membrane action was from the reinforcement mesh in the topping layer. Despite severe separations occurring between the PC slabs and beams, no PC slab collapsed even though the maximum displacement was larger than double the beam span. (c) 2018 American Society of Civil Engineers.
机译：在目前的研究中，三个三分之一缩放光束板子结构包括浇铸钢筋混凝土样本和两个预制混凝土（PC）样本在推动加载制度下进行测试，以研究连接类型对行为的影响PC结构减轻逐步崩溃。旨在提高PC板和PC波束之间的连接。提出了测试结果，包括负载位移曲线，最终负载能力，最终变形容量和局部菌株。进一步讨论了负载再分布的故障模式和机制。据证明，具有焊接连接的PC样本实现了脆性失效，最低的载荷能力和变形容量。尽管在具有固定连接的PC样本中实现了最低的初始刚度和第一峰值负载能力，但其大的旋转能力确保样品以延展性方式失效，这使得允许显着的拉伸膜作用。膜动作的主要来源来自浇头层中的增强网。尽管PC板和梁之间发生严重分离，但即使最大位移大于光束跨度的最大位移，也不会折叠PC板块。 （c）2018年美国土木工程师协会。

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