钢筋混凝土梁裂缝延伸高度发展规律试验研究  

Experimental Study on Regularity of Crack Elongation Height in Reinforced Concrete Beams

作　　者：管俊峰[1,2] 赵顺波[1,2] 黄承逵[2] 

机构地区：[1]华北水利水电学院土木与交通学院,河南郑州450011 [2]大连理工大学土木水利学院,辽宁大连116024

出　　处：《应用基础与工程科学学报》2011年第2期251-259,共9页Journal of Basic Science and Engineering

基　　金：河南省杰出青年科学基金(04120002300);河南省高校创新人才培养工程培养对象基金(豫教高[2004]294号)

摘　　要：通过28根保护层厚度、配筋和截面高度变化的钢筋混凝土梁的试验,系统研究了开裂后正常使用阶段各级荷载下裂缝延伸高度的发展规律.由试验数据的回归分析,建立了主裂缝间距稳定时的荷载水平与开裂荷载之间的经验公式.依据裂缝延伸机理,指出纵向受拉钢筋有效影响区的存在是裂缝延伸高度产生差异性的根本原因.给出了正常使用阶段裂缝延伸不同状态下高度的解析解,其与试验值吻合良好.研究成果为评估钢筋混凝土梁服役期内的工作性能提供了科研依据.Based on the test of twenty eight reinforced concrete beams with different concrete cover,reinforcement and depth of normal section,the regularity of crack elongation was studied under every loading.The empirical formula was established by using statistical analysis of experimental data,which was about the relationship between cracking moment and the load level when main crack spacing stabilized.The variability of crack height was caused by the existing of the effective influencing area of longitudinal tensile reinforcement,according to analyzing the mechanism of crack elongation.The analytical solutions of the various periods for calculating the elongation height were given out under the normal service stage,the results of the experiment agreed well with theoretical predictions.It can be used as reference to evaluate the working performance of reinforced concrete beam in service period.

关 键 词：钢筋混凝土 梁 裂缝 延伸高度 纵向受力钢筋有效影响区 

分 类 号：TU375.1[建筑科学—结构工程]