基于ANSYS平台的铁路桥梁最不利活载确定的二次开发

DETERMINING THE WORST-CASE OF LIVING LOAD OF RAILWAY BRIDGE BASED ON ANSYS SECONDARY DEVELOPMENT

在铁路桥梁的设计中,对活载作用效应进行分析时往往需要进行影响线(面)的计算及最不利活载的确定。随着铁路桥梁朝跨度大、构件多和结构复杂的方向发展,这部分工作变得越来越繁琐,手工计算已经难以解决了,普遍需要借助有限元软件来完成。大型通用有限元软件(例如ANSYS)往往没有内嵌这一专用的计算模块。本文针对这个问题,利ANSYS的APDL语言进行了二次开发,编制了相应的程序及宏,能高效快捷地完成铁路桥梁的影响线计算和最不利活载位置及大小的确定,有助于大型复杂铁路桥梁结构的设计。最后通过算例验证了本文计算方法和二次开发的正确性和实用性。

In the design of railway bridges, we need to calculate the influence line and make certain of the worst-case of living load to obtain living load effects. As the railway bridge is developing in large span, more components and complicated structures, so this part of work became more and more bothersome and hard to finish by manual computation, generally, we will only to finish it with the help of finite element software. The commercial finite element software ANSYS do not have this calculating model. This article will solve this problem by using the second development of APDL language. the calculating program and macro were programmed, which can efficiently and quickly finish calculating the influence line of the railway bridge and make certain of the worst-case of living load. This program and macro will be helpful to the design of large and complicated railway bridge. At last, an example is presented, which shows that the method and the second development put forward in the paper are feasible and effective.