节段预制拼装混凝土桥梁剪力键接缝的抗剪强度

Shear Strength of Keyed Joints in Segmental Precast Concrete Bridges

基于节段预制拼装混凝土桥梁腹板处多齿剪力键接缝脱离体的应力解析,分析并推导了多齿剪力键根部剪应力分布规律.依据弹性理论分析结果,提出了多齿剪力键根部剪应力分布的不均匀系数,并在考虑该不均匀系数后对AASHTO接缝抗剪强度计算公式进行了修正.与数值分析结果的比较表明,该修正公式能够准确地反映多齿剪力键中剪应力的变化趋势和峰值效应,而且修正公式计算结果与相关试验结果误差在5%以内.

Based on the stress analysis of a free body with a multi-keyed joint at the web of segmental precast concrete bridge, the shear stress distribution on the root of multi-keys at the joint was analyzed and derived. According to the elastic theoretical analysis, a non-uniform factor of shear stress at the root of multi-keys was proposed and used to modify the AASHTO formula of shear strength of the joint with multi-keys. The comparison with the numerical analysis results shows that the modified formula can accurately reflect the change trend and peak effect of shear stress in multi-keys. Moreover, the differences between the calculation results of the proposed modified formula and the relevant test results are within 5%.