新型预制装配式楼盖抗倒塌试验研究

Research on a Prefabricated Floor in Progressive Collapse

地震及爆炸荷载下的结构连续倒塌问题对人民的生命财产造成重大威胁,是土木工程领域研究的一个热门方向。为了提高新型预应力空心楼板结构的整体性,防止由于竖向支承构件的失效形成楼板的局部或者连续倒塌,对2块新型预应力空心板足尺模型进行四分点静力加载试验,研究新型预制装配式两跨连续楼板的抗连续倒塌能力。试件均由预应力空心短板通过板端伸出U形筋和胡子筋进行对接连接,板侧纵向拼缝通过胡子筋和植筋与边梁的纵筋进行连接,2个试件的计算跨度相同。本文采用在加载过程中突然拆除中间支座,得到楼板破坏形态、裂缝发展、承载能力、应变、最大变形等试验结果。对试件的受力过程、悬索作用机理进行分析,最后得到楼盖拼缝及板侧边梁连接构造的布置合理,新型预制装配式楼盖采用合适的周边连系和横向拼缝连接可以达到理想的抗倒塌能力。

With the numerous catastrophic incidences of progressive collapse in the past, there has been increasing interest from both engineering and academic communities toward evaluating the ability of reinforced concrete （RC） structures to resist progressive collapse. Progressive collapse of structures under earthquake and explosion problems induced a major threat to people＇s life and property. It is a hot direction in the research of civil engineering. The majority has focused on sce- narios in which a single vertical loading bearing member, such as a column, is removes. This pa- per adopted the same method. In order to improve the integrity of structures with prestressed concrete hollow core slabs and to prevent vertical support member failure or progressive collapse, the joint between slabs were studied in this paper, this study aims to assess the effects of vertical support removal on the overall performance and load resisting mechanisms of RC structures. Inthis paper, two prestressed hollow-core slabs are studies with the condition of concentrated load- ing by two points symmetrically, specimens is jointed by two short prestressed hollow-core slabs, then cast-in-place concrete grouted. Joints have two types, transverse direction by butte connection with U-shaped tendons and out of prestressed reinforcement, longitudinal direction by tie connection with planting bar and out of prestressed reinforcement. All specimens have the same span of calculation. This article used the quartile static loading method to research the new type of continuous slab prefabricated. In the process of loading suddenly dismantle intermediate support. The test results collected included failure modes, load resisting capacities, deformation capacities, strain gauge results, vertical movement of support. The suspension mechanism was analyzed during mechanical process of specimen. Finally the author comes to the conclusion that the arrangement of side beam and plate joints is reasonable, Appropriate peripheral and transverse joints in new type of prefabricated floor can achieve ideal collapse resistance.