腹板开裂钢筋混凝土梁抗力性能仿真分析  

Simulation Analysis of Resistance Performance of Web Cracking Reinforced Concrete Beam

作　　者：邓庆[1,2] 王青[1,2] 赵鹏[1,2] 王谊敏[2] 

机构地区：[1]三峡大学三峡地区地质灾害与生态环境湖北省协同创新中心,湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002

出　　处：《三峡大学学报（自然科学版）》2014年第6期73-75,84,共4页Journal of China Three Gorges University：Natural Sciences

基　　金：国家自然科学基金资助项目(51109121;51379111);湖北省自然科学基金项目(2012FFB03803)

摘　　要：对钢筋混凝土梁由于施工养护不当导致腹板开裂后的抗力性能进行了研究.采用数值仿真的方法分析了混凝土收缩和温度变形裂缝对梁力学性能的影响,结果表明:损伤后梁的抗弯承载力不会有明显下降,仍可满足设计要求;但既有裂缝的存在将导致受力裂缝提前产生并对其产生的位置有一定影响,同时对剪切斜裂缝的开展也会产生影响;既有裂缝的存在将降低梁的抗弯刚度,严重情况下将影响结构的可靠性.以上结论可为既有桥梁的评估与诊断提供一定的理论参考依据.The resistance performance of a reinforced concrete beam which was cracked in the web due to improper construction maintenance, is studied. The effects of shrinking cracks and temperature cracks on the mechanic property of the beam are analyzed by numerical simulation. The results show that the flexural ca- pacity of the damage beam is not significantly decreased. It can still meet the design requirements. However, the presence of existing cracks will lead to stress cracks beforehand. In addition, it will have some influence on the stress cracks position and the development of the inclined shear cracks. The presence of existing cracks will reduce the flexural rigidity of the beam, and will affect the reliability of the structure in some cases. The conclusions can provide the theoretical basis for assessment of existing bridges.

关 键 词：钢筋混凝土梁 裂缝 仿真分析 DIANA 

分 类 号：TU375.1[建筑科学—结构工程]