既有钢筋混凝土桥梁纵向配筋面积估算公式研究  

Research on Derivation of Longitudinal Reinforcement Formula of No-data Reinforced Concrete Bridge

作　　者：林启辉 王龙辉 梁健衡 李星 Lin Qihui;Wang Longhui;Liang Jianheng;Li Xing(Guangdong Jianke Construction Engineering Technology Development Co.,Ltd.Guangzhou 510500,China;Guangdong Provincial Academy of Building Research Group Co.,Ltd.Guangzhou 510500,China)

机构地区：[1]广东建科建筑工程技术开发有限公司,广州510500 [2]广东省建筑科学研究院集团股份有限公司,广州510500

出　　处：《广东土木与建筑》2020年第4期25-29,共5页Guangdong Architecture Civil Engineering

摘　　要：依据现有可查的方法估算既有梁纵向配筋面积,所得结果往往与梁实际配筋相差甚远,这给缺乏原始资料的旧桥加固工作带来较大的困难。以正截面抗弯承载能力公式为基础,推导未知配筋梁纵向配筋面积的公式,根据桥梁静载检测数据推算原有受力钢筋面积,并进行多组试验梁静载试验以及实际工程数据验证了公式的可靠性。试验结果显示,当静载试验的荷载试验系数越接近1,公式计算结果与梁实际配筋越接近,当荷载试验系数为(0.97,1.07)时,推导梁配筋的误差范围可偏安全地控制在5%以内。The area of longitudinal reinforcing bar of beam with unknown reinforcing bar estimated by the current method usually differs from actual situation,which brings difficulty to the reinforcement of old bridges.Based on the formula for calculating the bending load of cross section of concrete beam,the formula for calculating the longitudinal reinforcing bar area of the beam with unknown reinforcing bar is derived,which can estimate reinforcing bar area of beam by static load test of bridge.The formulaam,the formula for calculating the longitudinal reinforcing bar area of the beam with unkidal beam specimens as well as actual engineering data.The test results show that the closer the load test coefficient of the static load test is to 1,the closer the formula calculation result is to the actual bar area of the beam.And when the load test coefficient range is(0.97,1.07),the error between the calculation results and the actual range could be range under 5%,which is safe for practical engineering.

关 键 词：旧桥加固 纵向钢筋估算 静载试验 配筋估算公式 荷载试验系数 安全储备 

分 类 号：TU997[建筑科学—市政工程]