竖向拼缝对装配式空心井字楼盖受弯性能的影响  

Influences of vertical joints on flexural performance of fabricated hollow cross-grid floor slabs

作　　者：崔文潇 刘琛 陈忠范[1] 尹万云 刘守城 

机构地区：[1]东南大学混凝土及预应力混凝土结构教育部重点实验室,南京210096 [2]中国十七冶集团有限公司,马鞍山243000

出　　处：《东南大学学报（自然科学版）》2018年第1期106-112,共7页Journal of Southeast University：Natural Science Edition

基　　金：中国中冶"三五"科技重大专项资助项目(中冶科(2013)1号)

摘　　要：为改善竖向拼缝对新型装配式空心井字楼盖受力性能的不利影响,对具有不同拼缝构造形式的板带进行试验与分析.分别考虑拼缝数量、位置、宽度和粗糙度等因素来设计试验构件,对1个现浇板带和4个带有拼缝的板带进行竖向静载试验,得到构件的竖向位移、裂缝分布、受弯承载力及钢筋和混凝土的应力应变.试验结果表明,通过优化拼缝处构造可以适度提高板带的受力性能,在非主要受力处设置拼缝可使构件强度、刚度等受力性能更接近整浇构件.拼缝处钢筋的可靠连接可保证有效传力并限制混凝土接触面裂缝的发展.计算具有拼缝的空心井字楼板受弯承载力时可按设计规范取有效受压翼缘宽度.To weaken the negative influences of vertical joints on the flexural performance of fabricated hollow cross-grid floor slabs,the experiments and analyses on the fabricated floor strips with different vertical joints were carried out. Based on the influence factors including the number,the location,the width and the roughness of the joints,one cast-in-situ floor strip and four fabricated floor strips were designed. Through the static load tests,the deflection,the cracks development,the flexural bearing capacity,the stress,and the strain of steel and concrete were obtained. The experimental results demonstrate that the flexural performance of the fabricated floor strips can be improved to some extend by optimizing the design of the joint construction. The strength and the stiffness of the fabricated specimens approach those of the cast-in-situ members when the joints locate out of the main loaded areas. The reliable connections of the steel bars in the joints ensure the effective force transmission and restrict the development of the cracks on concrete surfaces. In the calculation of the flexural bearing capacity of the hollow cross-grid floor slabs with vertical joints,the effective compression flange width can be considered according to the code for design of concrete structures.

关 键 词：空心井字楼盖 装配式 拼缝 受弯性能 

分 类 号：TU375[建筑科学—结构工程]