钢-高配筋现浇混凝土结合梁裂缝宽度试验研究  

On Crack Width of Steel Cast-In-Place Concrete Composite Beams with High Reinforcement Ratio

作　　者：侯文崎[1] 罗如登[1] 叶梅新[1] 

机构地区：[1]中南大学铁道校区土建学院,湖南长沙410075

出　　处：《中国铁道科学》2001年第5期54-60,共7页China Railway Science

基　　金：铁道部科技研究开发重点项目 (96G3 5 N)

摘　　要：随着结合梁的设计由拉应力限值向裂缝宽度限值的转变 ,如何计算结合梁混凝土板的裂缝宽度已成为一个日益重要的问题。对此 ,国内外目前尚无较成熟的公式 ,大多借用普通钢筋混凝土结构裂缝宽度的计算公式。本文结合芜湖公铁两用长江大桥受拉区裂缝宽度控制的工程实际问题 ,对两根大型钢 高配筋现浇混凝土结合梁T1、T2分别进行了疲劳试验和极限承载力试验 ,研究了结合梁混凝土板裂缝宽度及其发展。研究结果表明 :现有混凝土结构裂缝宽度计算公式对影响结合梁裂缝宽度因素的考虑并不全面 ,所得计算结果与实测结果不能很好地吻合 ;对于钢 高配筋现浇混凝土结合梁 ,除普通钢筋混凝土结构已考虑到的因素外 ,还有许多其他更为复杂的因素应加以考虑 ,其中栓钉数量及布置方式是影响结合梁混凝土板裂缝宽度的重要因素。With the shift of design criteria of composite beams from ″limitation of tensile stress″ to ″limitation of crack width″, it is increasingly important to calculate the crack width of the concrete slabs of composite beams. As far as this problem is concerned, there is no authoritative formula at present. Usually, the formulas of reinforcement concrete structure (RC) are used in the calculation of crack width of composite beams. In order to control the crack width in the tensile area, a practical problem of Wuhu Yangtze River Bridge, fatigue and ultimate bearing capacity experiments are carried on T1 and T2, which are two giant steel cast in place concrete composite beams. The width and the development of the cracks of the concrete slabs of the two composite beams are also studied. The research results show that the current crack width formula of RC do not have an overall consideration of the influential factors of composite beams. Therefore, the theoretical crack width can not coincide well with the actually measured crack width obtained from the experiments. Besides all the factors that we have considered in RC, the results also show that, for the steel cast in place concrete composite beams with high reinforcement ratio, more influential factors should be taken into account. And the number and the arrangement of the studs are both important factors.

关 键 词：芜湖桥 结合梁 混凝土板 裂缝宽度 影响因素 试验研究 钢-高配筋现浇混凝土 

分 类 号：U448.216[建筑科学—桥梁与隧道工程] U448.121[交通运输工程—道路与铁道工程]