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对叠梁滑移问题的计算,通常假定粘结层的滑移应变与剪应力成线性关系;但对于库仑摩擦型叠梁来说,只有当层间剪力超过层间最大抵抗摩擦力后,才发生层间滑移。为了更精确研究摩擦型叠梁的力学特性,该文首先推导了考虑层间摩擦力影响的截面剪应力计算公式,进而确定了摩擦型叠梁层间滑移展开的力学条件和路径;最后借助传递矩阵法求解了叠梁滑移展开的长度以及对叠梁构件力学特性的影响;与ANSYS的计算结果对比表明该文提出的算法准确高效;滑移效应会破坏截面的整体性,增大局部弯曲应力,结构计算时应根据实际滑移情况考虑滑移效应对结构受力的影响。
For the calculation of stack-sliding problem, it is usually assumed that the slip strain of the bonding layer is linear with the shear stress. However, for the Coulomb friction-type stack beam, only when the interlaminar shear force exceeds the maximum frictional resistance between layers, Layer slip occurs. In order to study the mechanical properties of the friction-type laminated beam more accurately, this paper first derives the formula for calculating the shear stress of the section considering the influence of the inter-layer friction, and then determines the mechanical conditions and paths for the sliding expansion of the friction- The transfer matrix method is used to solve the problem of the length of the cross-deck sliding expansion and its influence on the mechanical properties of the girder. Comparing with the ANSYS results, the proposed algorithm is accurate and efficient. The slippage effect can destroy the integrity of the cross-section and enlarge the local Bending stress, the structural calculation should be based on the actual slip to consider the slip effect on the force of the structure.