有粘结预应力混凝土梁裂后抗弯刚度评估  

Estimation of Flexural Stiffness of Cracked Bonded Pre-stressed Concrete Beam

作　　者：黄义涛 王永光 张建 吴卫国[1] 孔祥韶[1] 

机构地区：[1]武汉理工大学交通学院,武汉430063

出　　处：《武汉理工大学学报（交通科学与工程版）》2017年第5期890-894,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家自然科学基金青年基金项目资助(11502180)

摘　　要：为了有效评估有粘结预应力混凝土梁开裂后的抗弯刚度,开展了模型梁短期刚度试验研究,根据试验结果分析和总结了有粘结预应力混凝土梁开裂后刚度退化规律.基于梁体裂缝纵向分布特性,采用变刚度梁模型简化方法计算了梁体抗弯刚度,并通过与现行规范的计算结果进行对比,确定了变刚度梁模型计算方法的适用范围.结果表明,采用变刚度梁模型计算开裂后梁体的抗弯刚度,可为正确评估正常使用状况下在役预应力混凝土梁桥的剩余承载能力提供参考依据.In order to evaluate flexural stiffness of the cracked bonded pre-stressed concrete beam effectively,experimental study on short-term stiffness of model beam is carried out.According to test results,the stiffness degradation law of cracked bonded pre-stressed concrete beams is analyzed and summarized.Based on longitudinal distribution characteristics of cracks,a simplified stiffness calculation model of variable stiffness is adopted to calculate flexural stiffness of beams.Comparing the calculation results with the current specification,the application scope of the variable stiffness beam model is determined.The results show that the simplified variable stiffness calculation method provides a reference for correctly evaluating the residual bearing capacity of the pre-stressed concrete beam bridge under normal service condition.

关 键 词：有粘结预应力混凝土梁 抗弯刚度 变刚度梁模型 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]