边缘叠合板等强配筋拼缝试验研究
摘要:提出一种新型边缘叠合板,为了研究钢筋混凝土边缘叠合板拼缝的受力性能,设计并实施了不同构造形式边缘叠合板的静力加载试验,包含附加钢筋形式、马镫筋布置、拼缝尺寸和底筋伸出等变量,分析了不同构造措施下,等强配筋设计边缘叠合板裂缝开展情况、挠度、钢筋应力以及受弯承载力性能,并与现浇板进行了对比。试验结果表明:该拼缝形式的拼缝板均为典型的弯曲破坏特征;拼缝处附加钢筋只要保证足够的粘结长度,附加钢筋就能够进行有效传力,采取等强配筋的边缘叠合板承载能力等同于现浇板;U形钢筋达到屈服需满足粘结锚固长度要求;钢筋网片末端弯折可以有效地减少钢筋锚固长度;拼缝处连接钢筋面积可按现浇层混凝土厚度进行受弯承载力计算确定。
关键词:装配式,钢筋混凝土边缘叠合板,边缘拼缝,等强配筋,静载试验
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参考文献[1] 余泳涛,赵勇,高志强.单缝密拼钢筋混凝土叠合板受弯性能试验研究[J].建筑结构学报,2019,40(4):29-37.
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[2] 颜锋,高杰,田春雨,等.带接缝的混凝土叠合楼板足尺试验研究[J].建筑结构,2016,46(10):56-60.
[3] 丁克伟,陈东,刘运林,等.一种新型拼缝结构的叠合板受力机理及试验研究[J].土木工程学报,2015,48(10):64-69.
[4] 吴方伯,刘彪,李钧,等.新型叠合板拼缝构造措施的试验研究及有限元分析[J].工业建筑,2015,45(2):50-56,75.
[5] 刘运林,叶献国,种迅,等.端拼缝叠合楼板受力性能试验研究[J].建筑结构,2015,45(4):85-89.
[6] 叶献国,华和贵,徐天爽,等.叠合板拼接构造的试验研究[J].工业建筑,2010,40(1):59-63.
[7] 李娟,倪东阳,刘香,等.L形拼缝叠合双向板受力性能试验研究[J].建筑结构,2020,50(2):67-71,86.
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Experimental study on edge laminated slabs connected with equal strength reinforcement seam
Abstract: A new type of edge composite slab was proposed. In order to study the stress performance of reinforced concrete edge composite slab seams, static load tests of edge laminated slabs with different structural forms were designed and implemented, including variables such as the form of additional reinforcement, the layout of stirrup reinforcement, the size of the seam and the extension of the bottom reinforcement. The crack development, deflection, steel stress and flexural bearing capacity of the edge composite slabs with different structural measures and reinforced with the equal strength principle were analyzed and compared with the cast-in-situ slabs. The test results show that the seam plates of this seam form are all typical bending failure characteristics. As long as the additional steel bars at the seams ensure sufficient bonding length, the additional steel bars can effectively transmit force. The load-bearing capacity of this type of equal strength reinforcement edge laminated slab is equivalent to that of the cast-in-situ slab. The U-shaped steel bar at the seam need to meet the requirements of the bond anchorage length to reach yield. The bending of the end of the steel mesh can effectively reduce the anchorage length of the steel bar. The area of connecting steel bars at the seams can be calculated and determined according to the concrete thickness of the cast-in-situ layer.
Keywords: fabricate; reinforced concrete edge laminated slab; edge seam; equal strength reinforcement; static load test
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