波纹钢板-混凝土界面能耗及其本构关系

Energy consumption and constitutive relationship of interface between corrugated steel plate and concrete

  • 摘要: 为了研究波纹钢板-混凝土的界面粘结滑移性能,考虑混凝土保护层厚度、混凝土强度、锚固长度及配箍率,完成了12个波纹钢板-混凝土试件的推出试验,对试件的破坏形态进行归纳分析,基于界面粘结滑移机制分析了不同阶段界面粘结力的组成,并从界面耗能角度对波纹钢板-混凝土的粘结性能进行了研究。结果表明:波谷处的混凝土裂缝由外向内发展,波脊处的混凝土在界面压应力和箍筋拉力作用下,裂缝与波脊延伸线呈45°;界面的极限粘结强度在0.99~1.86 MPa之间,残余粘结强度在0.25~0.63 MPa之间;增大锚固长度可提高界面的弹性变形能,使界面的极限粘结强度得到有效提高。最后考虑4个影响因素提出了波纹钢板-混凝土界面粘结应力-滑移本构关系表达式,并通过有限元分析对其进行验证,发现模拟所得曲线与试验曲线吻合度较高,表明所提出的本构关系表达式较为合理准确,可为波纹钢板-混凝土结构的有限元分析提供参考依据。

     

    Abstract: To study the interface bonding and sliding performance of corrugated steel plate concrete, considering the thickness of concrete cover, concrete strength, embedded length and stirrup ratio, the push out tests of 12 corrugated steel plate concrete specimens were completed, the failure modes of the specimens were analyzed and summarized, the composition of interfacial bonding force at different stages was analyzed based on the interfacial bonding slip mechanism, and the bonding performance of corrugated steel plate concrete was studied from the perspective of interface energy consumption. The results show that the concrete cracks at the trough develop from the outside to the inside. Under the action of interfacial compressive stress and stirrup tension, the crack of concrete at wave ridge is 45° with the extension line of wave ridge. The ultimate bond strength of the interface is between 0.99 and 1.86 MPa, and the residual bond strength is between 0.25 and 0.63 MPa. Increasing the embedded length can improve the elastic deformation energy of the interface and the ultimate bond strength of the interface. Finally, considering the four influencing factors, the bond stress-slip constitutive relation expression of the interface between corrugated steel plate concrete was proposed and verified by finite element analysis. It is found that the simulated curve is in good agreement with the experimental curve, which shows that the proposed constitutive relation expression is reasonable and accurate, and can provide a reference for the finite element analysis of corrugated steel plate concrete structure.

     

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