大跨PC箱梁节段接缝对结构变形的影响
Journal of Basic Science and Engineering(2013)
Abstract
为分析大跨悬浇预应力混凝土连续刚构桥箱梁节段接缝对桥跨挠度的影响,建立了考虑施工全过程以及运营期长期变形的已建大跨预应力混凝土连续刚构桥的有限元模型,用抗剪刚度的降低模拟了箱梁节段接缝的弱化,重点分析了箱梁节段接缝弱化对成桥挠度和长期挠度的影响.分析结果表明,只有在接缝抗剪刚度大幅降低的前提下,箱梁节段接缝的剪切变形对桥跨结构的挠度才具有显著的影响,而接缝开裂后的抗剪刚度大小是决定影响程度的关键,节段接缝的剪切变形以及由此而引起的剪切徐变是否会造成大跨预应力混凝土箱梁持续下挠还有待于试验验证.
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Key words
Box girder,Deflection,Prestressed concrete,Segmental joints,Shearing deformation
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