组合梁负弯矩区“抗拔不抗剪”滑移计算

为改善组合梁负弯矩区受力性能,聂建国提出一种新的"抗拔不抗剪"剪力连接件技术,能使混凝土不受拉力作用。但这样必然导致组合梁的滑移增大,且组合梁抗滑刚度分布的变化使原有滑移计算方法都不再适用。本文从滑移微分控制方程出发,得到了负弯矩区采用"抗拔不抗剪"连接件技术的组合梁滑移计算的解析表达式,经过算例分析与比较,结果表明采用"抗拔不抗剪"新技术将会使滑移增大,使用时应充分考虑其影响。该滑移计算方法可以为新技术的应用和推广提供参考。

ANALYTICAL METHOD OF SLIP ANALYSIS FOR COMPOSITE BEAMS WITH "UPLIFT-RESTRICTED AND SLIP PERMITTED" CONNECTORS IN NEGATIVE MOMENT REGIONS

In order to improve the mechanical behavior of the negative moment regions of the composite beams,Nie Jianguo proposed a new "uplift-restricted and slip permitted" shear connector technology,which can relieve the tension force to concretes.However,this method inevitably leads to the increase of the slip of composite beams,and the variation of the anti-sliding stiffness distribution of the composite beam makes the original slip calculation method no longer applicable.This paper starts from the slip differential control equation,then derives the analytical expression of the slip of the composite beam applying the "uplift-restricted and slip permitted" connection technique.Mter the numerical analysis and comparison,it is concluded that slip will increase if the new "uplift-restricted and slip permitted" shear connectors are utilized,this impact should be carefully considered.This slip calculation method can provide reference for the application and popularization of this new technology.