曹娥江袍江大桥初应力研究

摘要

对于主拱肋为桁式截面的钢管混凝土拱桥。其拱肋由多根弦管组成，浇筑时间和浇筑顺序的不同对初应力度有一定的影响，因此，以曹娥江袍江大桥为工程背景，建立有限元模型，模拟了钢管混凝土拱桥的不同浇筑顺序和浇筑时问对拱肋初应力的影响，并在此基础上进行了考虑初应力的曹娥江袍江大桥的极限承载力计算。%The steel tube of Concrete Filled Steel Tubular structure will produce initial stress in the processing of construction. For the section of concrete filled steel tubular （CFST） arch bredge with braced arch has several ribs, which will produce different pouring means and sequences. Taking the Caoejiang Bridge as the prototype and building the finite element model with the program of MIDAS, different pouring means and sequences of CFST arch bridge are simulated to study the value of initial stress and the definition of ratio of initial stress is discussed. In the end, influence effects of initial stress to Caoejiang Bridge arch rib＇ s load-carrying capacity are analyzed.