锈蚀钢筋混凝土梁的受弯分析模型  

Analytical model of flexural behavior of corroded reinforced concrete beams

作　　者：邢国华[1,2] 牛荻涛[1] 

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]长安大学建筑工程学院,陕西西安710061

出　　处：《中南大学学报（自然科学版）》2014年第1期193-201,共9页Journal of Central South University:Science and Technology

基　　金：国家杰出青年科学基金资助项目(50725824);中国博士后科学基金资助项目(20110491651);陕西省自然科学基金资助项目(2013JQ7023);中央高校基本科研业务费专项资金资助项目(CHD2010JC082)

摘　　要：以锈损率较低的钢筋混凝土简支梁为对象,在平截面假定基础上,提出考虑钢筋、混凝土材料性能劣化和几何尺寸变化的受弯承载力计算公式;采用换算截面法计算锈蚀钢筋混凝土梁的等效刚度,给出考虑锈蚀钢筋、混凝土二者间黏结性能退化的有效刚度计算公式,建议锈蚀钢筋混凝土简支梁在集中荷载作用下跨中挠度的计算方法,并通过39根锈蚀钢筋混凝土梁的试验数据对建议受弯分析模型验证。研究结果表明:锈蚀钢筋混凝土梁受弯承载力试验值与计算值之比的平均值为1.100,方差为0.041,二者吻合较好;多数锈蚀试件按受弯分析模型计算得到的荷载-跨中挠度曲线与试验曲线吻合较好,变化趋势相当,建议受弯分析模型可为锈蚀钢筋混凝土梁的全过程受力分析提供参考。By selecting reinforced concrete beams of lower corrosion rates as research object, a calculation formula of flexural baring capacity of corroded reinforced concrete beams was put forward based on the plane section assumption. Furthermore, a theoretical expression of equivalent stiffness of corroded reinforced concrete beam was suggested by using transformed section approach. The weakening of the bond between concrete and reinforcement was considered in this method. In addition, a theoretical formula of mid-span deflection of corroded reinforced concrete simply supported beams subjected to a four-point bending was proposed. The analytica.1 model was verified using 39 corroded reinforced concrete beams. Good agreement between test results and prediction results for flexural baring capacity is achieved with an average ratio of test results to predicted results being 1.100 and the variance being 0.041. The trends of the test load-mid span deflection curves and the predicted curves are much the same. Thus, the suggested model can be served as a reference for full-range analysis of corroded reinforced concrete beams.

关 键 词：黏结 锈蚀 受弯性能 梁 有效刚度 

分 类 号：TU375.1[建筑科学—结构工程]