体外预应力钢-混组合梁长期滑移计算

发布时间：2018-06-17 11:10

本文选题：钢-混组合梁 + 收缩徐变　；参考：《浙江大学学报(工学版)》2017年04期

【摘要】：针对现行规范中钢-混组合梁桥设计时界面滑移未计入混凝土收缩徐变效应的影响,在线性滑移和混凝土钢梁之间无掀起的假定下,推导综合考虑桥面板混凝土长期性能和施加预应力影响的体外预应力钢-混组合梁桥的滑移计算公式.通过对某一典型简支钢-混组合小箱梁黏结滑移的计算及结果比较,证明提出的方法及推导公式的正确性.参数研究结果表明,当考虑混凝土收缩徐变长期性能的影响时,钢-混组合梁的界面滑移会随着时间和预应力的增加而不断增加;简支组合梁的滑移量一般由中间向梁两端逐渐增大,在梁两端滑移量达到最大值.在预应力钢-混组合梁的设计中,除考虑预应力对组合梁变形有利的方面外,还应注意和控制预应力对组合梁界面滑移不利的影响.
[Abstract]:In view of the fact that the interface slippage of steel-concrete composite beam bridges in the current code does not take into account the effect of concrete shrinkage and creep, under the assumption that there is no lift between linear slippage and concrete steel beams, The slip calculation formula of externally prestressed steel-concrete composite beam bridge considering the long-term performance of deck slab and the influence of prestressing force is derived. Through the calculation and comparison of the bond slip of a typical simply supported steel-concrete composite small box girder, the correctness of the proposed method and the derivation formula is proved. The results of parameter study show that the interface slip of steel-concrete composite beams increases with the increase of time and prestress when the long-term behavior of concrete shrinkage and creep is taken into account. The slip of simply supported composite beam increases gradually from the middle to the end of the beam and reaches the maximum value at the two ends of the beam. In the design of prestressed steel-concrete composite beams, in addition to considering the advantages of prestress on the deformation of composite beams, the adverse effects of prestress on the interface slip of composite beams should also be paid attention to and controlled.
【作者单位】：浙江大学建筑工程学院;浙江大学唐仲英传感材料及应用研究中心;
【分类号】：TU398.9

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