高强钢筋混凝土梁短期裂缝计算方法评析  

Calculational method for short-term crack of reinforced concrete beams with high-strength steel bars

作　　者：赵勇[1] 王晓锋[2] 程志军[2] 周建民[1] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]中国建筑科学研究院,北京100013

出　　处：《建筑结构学报》2011年第1期50-57,共8页Journal of Building Structures

基　　金：国家"十一五"863计划课题(2007AA03Z550);国家科技支撑计划课题(2007BAE30B05)

摘　　要：收集和整理近年来国内完成的114根配置400MPa或500MPa级热轧带肋钢筋混凝土梁受弯试验短期裂缝结果,对GB 50010—2002《混凝土结构设计规范》的裂缝计算公式进行评估分析。分析结果表明:规范的短期裂缝计算方法仍可适用于配置高强带肋钢筋的混凝土受弯试件,但平均裂缝间距、平均裂缝宽度和最大裂缝宽度试验值与按规范公式计算的结果相比总体上偏低,二者之比的均值分别为0.930、0.711和0.739,因此建议对部分参数进行修正。利用试验数据进行参数回归分析,得到裂缝间距和裂缝宽度计算模式的修正公式,修正后的计算值和试验值符合较好,但对配置多层钢筋的情况有待进一步研究。The paper evaluates the formulae for the crack spacing and crack width specified in the code for design of concrete（GB 50010—2002） using experimental data of 114 concrete beams reinforced with 400MPa or 500MPa longitudinal hot ribbed steel bars and tested under short-term bending loads in recent years in China.The analysis shows that the original method in GB 50010—2002 is adaptable to flexural members with high-strength reinforcement,but the test values of average crack spacing,average crack width and maximum crack width are in general less than those calculated according to GB 50010—2002 with the average ratios of 0.930,0.711 and 0.739 respectively.So it is necessary to revise some parameters of the formulae.Based on the test results,the revised formulae of the crack spacing and crack width are suggested through regression analysis for beams with high-strength steel bars.The predicting values from the revised formulae agree well with the test results,but the applicability of the formulae to the cases of multi-row reinforcement beams needs further study.

关 键 词：钢筋混凝土梁 高强钢筋 热轧带肋钢筋 短期裂缝 裂缝间距 裂缝宽度 

分 类 号：TU375.11[建筑科学—结构工程]