基于ANSYS二次开发的大体积混凝土温度徐变应力分析

Temperature creep stress analysis of mass concrete based on secondary development of ANSYS

基于大型商业软件ANSYS提供的参数化设计语言(APDL)和用户可编程特性(UPFs),通过修改ANSYS提供的USERMAT.F源程序,将混凝土徐变模型和本构方程引入ANSYS.在USERMAT.F中通过高斯积分直接生成温度徐变荷载,实现混凝土温度徐变应力分析,克服了传统通过调用温度徐变荷载文件而计算效率较低的缺陷.研究表明:自定义编写开发的混凝土温度徐变应力计算模块,可高效求解大体积混凝土在水化热作用及天然冷却下产生的温度场及温度徐变应力场,并得到温度及应力的分布和变化规律.研究成果对ANSYS的二次开发具有重要的理论意义,对揭示混凝土早期应力变化规律具有工程指导价值.

Based on parametric design language（APDL）and user programmable features（UPFs）of ANSYS,the model of concrete creep and the constitutive equation are introduced into the large commercial software ANSYS by modifying the USERMAT.F source program in the software.Temperature creep load is generated directly by using the Gauss integral in USERMAT.F;and the concrete temperature creep stress is analyzed,by which the limitation of low computational efficiency in the traditional way through calling the file of temperature creep load is overcome.The research results show that the temperature field and temperature creep stress field of mass concrete are efficiently solved under the condition of the heat of hydration and natural cooling.The distribution and variation law of temperature and stress are obtained through the temperature creep stress calculation module of concrete compiled and developed by user.The research results have important theoretical significance for the secondary development of ANSYS and engineering guidance value for revealing the stress variation of early age concrete.