采用弹塑性损伤力学的砖石建筑遗产结构性能非线性有限元分析

Nonlinear Finite Element Analysis of Structural Performance of Bricks and Stones Building Heritage Using Elastoplastic Damage Mechanics

为了研究中华门城堡的结构安全性能及残损病害的成因,在Drucker-Prager屈服准则的基础上,引入受拉和受压损伤变量.基于ANSYS的usermat子程序,开发砖石建筑遗产的弹塑性损伤本构模型,并采用本构模型对中华门城堡进行有限元模拟分析.通过子程序中的受拉和受压损伤变量,反映结构整体的损伤状况.研究结果表明:中华门城堡最大拉应力出现在拱券与南部城砖砌体墙的交接处、东西及南侧条石砌体墙的上部,最大压应力出现在南侧条石砌体墙下部;损伤变量的分布与中华门城堡现状残损较为吻合.

In order to study the structural safety performance and the causes of damage disease of Zhonghuamen City Gate,the tensile and compressive damage variables are introduced into Drucker-Prager yield criterion.Based on the usermat subroutine of ANSYS,the elastoplastic damage constitutive model of bricks and stones heritage structure is developed,and the finite element analysis of Zhonghua City Gate is carried out by the constitutive model.The damage of the whole structure is reflected by the tension and compression damage variables in the subroutine.The research results show that the maximum tensile stress of the Zhonghua City Gate occurs at the junction of the arch and the southern city brick masonry wall,the upper part of the strip masonry wall on the east,west and south sides.The maximum compressive stress occurs at the lower part of the south side of the strip masonry wall.The distribution of damage variables is consistent with the current damage of Zhonghuamen City Gate.