混合单元法在大跨度异形拱桥有限元分析中的应用  

Application of Hybrid Element Method in Finite Element Analysis of Large-span Special-shaped Arch Bridges

作　　者：陈冠 CHEN Guan(Hunan Road and Bridge Construction Group Co.,Ltd.,Changsha,Hunan 410015,China)

机构地区：[1]湖南路桥建设集团有限责任公司,湖南长沙410015

出　　处：《黑龙江交通科技》2022年第4期95-98,共4页Communications Science and Technology Heilongjiang

摘　　要：针对传统的空间梁-杆单元建模无法考虑异形拱局部应力的问题,以宁波甬江异形拱为研究背景,建立了梁-杆-壳混合有限元模型,并分别对恒载、恒载+活载、恒载+活载+风荷载三种工况下结构整体及局部内力进行对比,整体结构在三种工况下轴力、面内弯矩误差在1.1%以内,拱顶局部段轴力、面内弯矩误差分别为1%和2%,验证了混合有限元模型的正确性。根据混合有限元模型计算结果,截面畸变应力为70~90 MPa,在实际工程中进行整体-局部稳定分析时不可忽视。Aiming at the problem that the traditional spatial beam-rod element modeling cannot consider the local stress of the special-shaped arch,a beam-rod-shell hybrid finite element model is established with a special-shaped arch as the research background.The overall and local internal forces of the structure under the three working conditions of dead load+live load+wind load are compared.The in-plane bending moment errors are 1%and 2%,respectively,which verifies the correctness of the hybrid finite element model.According to the calculation results of the hybrid finite element model,the section distortion stress is 70~90 MPa,which cannot be ignored in the global-local stability analysis in practical engineering.

关 键 词：空间梁-杆单元 异形拱 梁-杆-壳混合单元 轴力 面内弯矩 

分 类 号：U442[建筑科学—桥梁与隧道工程]