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中文摘要：
为了分析混凝土箱梁的徐变效应与剪力滞效应的相互影响,基于箱梁剪力滞效应计算的能量变分方法,推导了混凝土箱梁徐变受剪力滞效应影响的次内力和应力计算公式.结合先简支后连续箱梁算例,计算了受剪力滞效应影响后的徐变弯矩和应力,分析了考虑徐变效应影响的剪力滞系数.结果表明,与不考虑剪力滞效应的结果相比,剪力滞效应增大了箱梁徐变效应.对算例箱梁,考虑剪力滞效应后,对中支点截面处徐变的影响最大,次内力增大42.56%,腹板处应力减小8.5%.
英文摘要：
To analyze how creep interacts with shear lag effect in concrete box girders, the cal- culation formulae for the creep secondary internal force and stress were derived with the energy variation method. With a simply supported-to-continuous box girder for example, the creep bending moment and stress were calculated under the shear lag effect, and the shear lag coeffi- cients were obtained under the influence of creep. The results show that the shear lag effect in- creases the creep stress significantly. Under the shear lag effect, the creep variation at the inter- mediate bearing section is the maximum, where the secondary bending moment increases by 42.56% and the flange normal stress above the web plate decreases by 8.5%.
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