配筋率对钢筋混凝土构件弹性模量影响的试验研究  

Experimental study on influence of ratio of reinforcement to modulus of elasticity of reinforced concrete component

作　　者：屈铁军[1] 徐荣桓 石云兴[2] 

机构地区：[1]北方工业大学建筑工程学院,北京100144 [2]中国建筑工程总公司技术中心,北京101300

出　　处：《混凝土》2014年第9期113-115,119,共4页Concrete

基　　金：北京市自然科学基金资助(8142015);北京市人才强教深化计划项目资助(PRH201107106)

摘　　要：弹性模量是结构分析的主要力学参数之一。目前,在结构分析中,钢筋混凝土构件的弹性模量取值多取素混凝土的弹性模量值,很少涉及配筋率对钢筋混凝土构件弹性模量的影响。推导了钢筋混凝土构件弹性模量与配筋率的关系,设计制作了11组共计33件不同配筋率的钢筋混凝土试件,分别测得各试件的弹性模量;用最小二乘法回归得到混凝土构件弹性模量和配筋率关系的曲线,回归结果与理论推导结果基本一致。列举了一个悬臂梁的算例,分析了弹性模量对结构分析的影响。研究结果表明,配筋率对钢筋混凝土构件的弹性模量有影响,进行结构动力计算且配筋率较高时,若忽略钢筋对构件弹性模量的影响,会引起较大的误差。Elastic modulus is an important mechanical parameter in analysis and design of reinforced concrete structures. The present value of elastic modulus,which has rare relation with ratio of reinforcement,is based on plain concrete.It deduced an equation between modulus of elasticity and ratio of reinforcement,and then an experimental study was conducted on 11 groups＇ specimen of reinforced concrete with different ratio of reinforcement. At last,an equation for elastic modulus of different reinforcement ratio determined by regression,using least squared method,was described. A cantilever,whose dynamic characteristics and dynamic response were calculated,was taken as an example to analyze the influence of ratio of reinforcement on the structural analysis.The result showed that the ratio had effect on the elastic modulus. Moreover,if the general elastic modulus was ignored when calculate the dynamic response,it would cause deviation.

关 键 词：弹性模量 配筋率 结构分析 钢筋混凝土 

分 类 号：TU528.01[建筑科学—建筑技术科学]