V形刚构桥施工中倒三角区域支架的拆除时机分析

采用桥梁博士软件模拟一座典型的V形墩连续刚构桥的施工过程,为找出支架拆除对传力途径的影响,分别单独计算结构自重、预应力以及收缩徐变内力,然后对单因素分析的结果进行组合。分析结果表明倒三角区域支架的拆除时机对桥梁在施工阶段及成桥后的内力均有显著影响,可达50%以上。建议优先采用早拆支架方案,以使结构受力明确,且对V形墩区域受力有利。

Study on the Demolishment Sequence of Scaffolds for the Inverted-triangle Area of the Rigid-frame Bridges with V-piers

The paper adopted the software of Bridge Doctor to simulate the construction process of a typical Rigidframe Bridges with Vpiers.The internal force caused by selfweight,prestress,shrink and creep was computed separately to identify the influence of the demolishment sequence of scaffolds on the load transfer.Then,a combination of the factors was discussed.The analysis results indicatehat the demolishment sequence of the invertedtriangle area region scaffolds has remarkable influence on the internal force in the construction and completion phase,the difference of which may be greater than 50%.Therefore early demolishment should be preferred so as to make the load transfer more clear and the invertedtriangle area in good condition.