剪切波沿钢筋纵向入射时钢筋与混凝土间黏结力拟静力解析解

为研究钢筋与混凝土之间黏结应力分布以及黏结应力和滑移量之间关系的理论,基于拟静力假定,从剪切波沿钢筋纵向入射时钢筋混凝土的弹性响应入手,运用线性本构滑移模型及弹性复势方法获得钢筋与混凝土界面滑移量与黏结力的封闭形式解答,并通过算例分析钢筋直径、混凝士动剪切模量、混凝土保护层厚度、箍筋直径及间距对滑移量及黏结力的影响规律.研究结果表明:当选用的钢筋直径越小时,钢筋与混凝土间黏结力越大而滑移越小；当钢筋直径越大时,则恰好相反；当动剪切模量越大时,钢筋与混凝土间黏结力及滑移量都越大,动剪切模量越小,则钢筋与混凝土间黏结力及滑移量越小;当混凝土保护层越厚时,钢筋与混凝土间黏结力越大；当混凝土保护层越薄时,则反之,而滑移量却没有明显变化；箍筋间距对黏结力及滑移量的影响很微弱；箍筋直径越大,黏结力越大,箍筋直径越小,则钢筋与混凝土间黏结力及滑移量越小,而滑移量没有明显变化.所得结果与试验结果相吻合,该封闭形式解答可为钢筋混凝土结构设计提供理论依据.

Quasi-static analysis solution of bond stress between rebar and concrete subjected to incidence of shear wave along rebar length direction

In order to enrich the theoretical investigation of bond stress distribution between rebar and concrete and relation between slip and bond stress,elastic response of reinforced concrete subjected to incidence of shear wave along the rebar length direction was analyzed based on quasi-static assumption,and closed form solution of the slip and the bond stress between rebar and concrete were obtained by using linear constitutive mode of slip and elasticity complex potential method.The influence of diameter of rebar,dynamic shear modulus of concrete,thickness of concrete cover and diameter and spacing of stirrup on slip and bond stress was investigated through numerical analysis.The results show that the smaller the diameter of rebar,the bigger the bond stress and the smaller the slip,and vice versa.The bigger the dynamic shear modulus of concrete,the bigger the bond stress and the slip,and vice versa.The bigger the thickness of concrete cover,the bigger the bond stress,and vice versa,but the slip has no significant change.Spacing of stirrup has no significant influence on the bond stress and slip.The bigger the diameter of stirrup,the bigger the bond stress,and vice versa,but the slip has no significant change.The obtained disciplines can match the results of experiments,and the closed form solution may supply theoretical foundation for design of reinforced concrete.