钢-混凝土组合梁温度效应的解析解

发布时间：2018-04-24 20:25

  本文选题：桥梁工程 + 钢-混凝土组合梁　； 参考：《交通运输工程学报》2017年04期

【摘要】：针对考虑和不考虑界面滑移2种情况,在任意温度分布作用下,推导了钢-混凝土组合梁界面剪力、相对滑移和温度应力理论计算公式,采用有限元模拟对考虑界面滑移的公式进行了验证,并在钢-混凝土温差模式(模式1)、《公路桥涵设计通用规范》(JTG D60—2015)温差模式(模式2)和英国规范BS5400温差模式(模式3)下,对比了温度效应的计算结果。分析结果表明:采用考虑界面滑移的剪力理论公式计算出的组合梁界面剪力分布与有限元计算结果规律一致,3种模式下剪力最大偏差分别为1.15%、2.65%和3.41%;组合梁界面剪力服从双曲余弦函数分布,界面滑移服从双曲正弦函数分布;不考虑滑移与考虑滑移计算得到的界面最大剪力基本相等,最大偏差仅为1.22%;组合梁跨中温度应力计算值的最大偏差小于1%,但组合梁端部温度应力计算值偏差较大,模式3温差为20℃时,考虑滑移时的混凝土底部温度拉应力为不考虑滑移时的1.9倍;组合梁的界面温度效应与温差成线性关系,斜率与温度分布模式有关,模式1的界面剪力、界面剪应力和界面滑移的变化速率最大,分别为9.138kN·℃-1、0.067MPa·℃-1和5.263×10-3 mm·℃-1;温差为30℃时,模式1的界面剪力、界面剪应力和界面滑移变化速率均为模式3的3倍以上,因此,不考虑钢梁温度梯度会使组合梁界面剪力、相对滑移与温度应力计算结果产生偏差,且偏差会随温差的增大而增大。
[Abstract]:Considering and disregarding the interface slip, the theoretical formulas of shear force, relative slip and temperature stress of steel-concrete composite beams are derived under arbitrary temperature distribution. The formula considering interface slippage is verified by finite element simulation, and the temperature difference model (mode 2) and the BS5400 temperature difference mode (mode 3) of the British Code for the Design of Highway Bridges and culverts (Mode 1, < Highway Bridge and culvert Design General Code >) have been verified by finite element simulation. The calculated results of temperature effect are compared. The results show that the maximum deviation of shear force is 1.152.65% and 3.41 respectively under the three modes: the shear distribution of composite beam calculated by the shear theory formula considering interface slip is consistent with the result of finite element method. The interfacial shear of composite beam is equal to 1.15% and 3.41%, respectively, and the maximum deviation of shear force is 1.15% and 3.41%, respectively. The force suit is distributed from the hyperbolic cosine function, The interface slip clothing is distributed from the hyperbolic sinusoidal function, and the maximum shear force of the interface calculated without considering the slip is basically equal to that obtained by the calculation of the slip. The maximum deviation is only 1.22 and the maximum deviation of the calculation value of the temperature stress in the span of the composite beam is less than 1, but the deviation of the calculation value of the temperature stress at the end of the composite beam is large, when the temperature difference of mode 3 is 20 鈩，

本文编号：1798109