如何编制结合梁桥计算分析软件——几个关键问题的解决办法

Approach to the Development of the Composite Beam Bridge——Analysis Program-Solutions to Some Key Issues

结合梁的计算分析仍建立在平截面假定的基础上 ,表征结构受力状态的量值已具体到结合部位的混凝土板和钢主梁 .对于一些关键问题 ,如组合截面的内力分解、结合部位混凝土板收缩和徐变的计算、温度荷载的计算等提出解决的方法并且推导出适合利用有限元进行计算的公式 .按照本文思路编制成的计算软件 ,已在芜湖长江大桥、福州青洲闽江大桥和泰国八世皇大桥的分析中应用 。

The analysis of composite beam has been based on a plane cross section assumption. The forces of concrete slab and the main steel girder in the composite beam has been calculated respectively. In the analysis, solutions to some key issues, such as the inner force distribution of composite section, concrete slab shrinkage, creep calculation of the composite part and calculation of temperature load, should be found and a formula suitable for finite element calculation should be deduced. The software developed based on this scheme has been applied in the analysis of the Wuhu Yangtze River Bridge, Qingzhou Minjiang River Bridge in Fuzhou and Rama VIII Bridge in Thailand, and the results are proved to be correct and reliable.