基于ANSYS平台的斜拉桥调索方法研究

在斜拉桥的极限承载力分析中,首先需要提供一组斜拉索初始索力,使计算所得的成桥状态恒载作用下的索力与设计成桥索力一致。这是一个需要反复调整、试算的过程,往往需要投入较多的人力和时间。本文利用ANSYS二次开发的功能,开发了斜拉桥调索程序,使繁琐的调索过程在ANSYS中自动完成,减少了人力,提高了工作效率。该程序已应用于我国正在修建的某一座三索面三主桁特大跨度公铁两用斜拉桥分析中,96根斜拉索的调索过程在ANSYS中自动完成,计算所得的成桥状态恒载作用下的索力与设计成桥索力误差在0.5%以内。该程序的开发为以后其他斜拉桥的分析计算提供了方便,为以后类似问题的ANSYS二次开发提供了思路。

Research on Adjusting Cable Forces of Cable-stayed Bridges Based on ANSYS

In the analysis of the ultimate brearing capacity of a cable-stayed bridge,a set of initial cable forces are needed.The required initial cable forces are used to work out the cable forces of the completed bridge under the dead load which equal to the cable forces specified by designers.It is a trial-and-error process which needs a great deal of manpower and time.By means of ANSYS secondary development,a-cable-force adjusting programme is developed so that initial cable forces are adjusted automatically in ANSYS.It reduces manpower and improves work efficiency.The programme was used in analysis of a long-span highway-railway cable-stayed bridge with the tri-cable plane. 96 cables were adjusted successfully and automatically in ANSYS.The cable forces of the completed bridge under the dead load had an error below 0.5% as Compared with cable forces specified by designers.So the cable-force-adjusting programme facitates convenient analysis of cable-stayed bridges and ANSYS secondary development of other similar issues.