钢筋混凝土梁短期裂缝宽度计算  

Calculation of Short-Term Crack Width of Reinforced Concrete Beams

作　　者：杜毛毛[1] 

机构地区：[1]华侨大学土木工程学院,福建厦门361021

出　　处：《沈阳建筑大学学报（自然科学版）》2012年第6期1004-1008,共5页Journal of Shenyang Jianzhu University：Natural Science

基　　金：国家自然科学基金项目(51208216);福建省自然科学基金计划项目(2012J01222);中央高校基本科研业务费专项资金资助(JB-ZR1230);华侨大学高层次人才科研启动费项目(11BS106)

摘　　要：目的评析我国《混凝土结构设计规范》的裂缝宽度计算公式,指出其不足之处,提出钢筋混凝土梁短期裂缝宽度计算的建议公式.方法基于规范的裂缝宽度计算模式,通过收集整理国内外钢筋混凝土梁的短期裂缝宽度试验数据,对规范公式计算值与实测值进行比较,并对规范公式进行修正.结果对配置高强钢筋的混凝土梁,新规范裂缝宽度公式计算值比实测值偏大10%左右,旧规范裂缝宽度公式计算值比实测值偏大近20%.新旧规范公式均过大地考虑了混凝土保护层厚度对裂缝宽度的影响.结论相比规范公式,建议公式计算值与实测值符合更好.建议公式不仅适用于配置普通钢筋的混凝土梁,对配置高强钢筋以及大保护层的混凝土梁均有着较好的适用性.According to the experimental data of short-term crack width of reinforced concrete beams at home and abroad,comment on the crack width formulas in Code for Design of Concrete Structures in our country is made.Through the comparison between calculating values of code formulas and test ones,the deficiency of code formulas is pointed out.Based on the calculating mode of crack width in the code,the suggested formulas for short-term crack width of reinforced concrete beams are proposed.Results show that,for the concrete beams with high-strength steel bars,the calculating values of crack width formulas of new code are greater than the test ones by about 10%;the calculating values of crack width formulas of old code are greater than the test ones by nearly 20%.The effect of concrete cover on crack width is excessively considered in the new and old code formulas.The calculating values of suggested formulas agree better with the test ones than the calculating values of code formulas.The formulas suggested in this paper can be suitable not only to the concrete beams with ordinary steel bars,but also to the concrete beams with high-strength steel bars and with thick concrete cover.

关 键 词：钢筋混凝土梁 裂缝宽度 高强钢筋 大保护层 

分 类 号：TU375.1[建筑科学—结构工程]