桥梁有限元软件中实现荷载效应分项的方法

为完成新公路桥规的各项检算,需在计算软件中把荷载效应进行分项,把恒载分为自重、预应力的一次力(主效应)和二次力(次效应)、收缩徐变效应。完成此项工作需要解决2个关键问题,其一是拆除临时单元或约束要按照内力分项分批完成;其二是为了能准确计算预应力的主效应,需计算出预应力的永存有效应力。通过算例说明上述问题的解决方法。

Method for Realization of Itemizing Load Effect in Bridge Finite Element Software

To complete all checking calculations for the new highway bridge specifications,the load effect is required to be itemized in the calculation software and the dead load should beitemized as effect of self weight,the first force(primary effect) and second force(secondary effect) of prestressing,and shrinkage and creep effect.Two critical problems have to be resolved before the itemizing of the load effect can be completed, that is,firstly the removal of temporary elements or restraints should be carried out by steps in accordance with the itemizing of internal force,and secondly the permanent effective stress of the prestressing should be calculated in order to correctly calculate the primary effect of the prestressing.In this paper, the ways to find out the solutions to the above-mentioned problems are illustrated through given calculation examples.