3D non-linear behavior of masonry arch bridges
3D non-linear behavior of masonry arch bridges
复制标题
砌体拱桥的 3D 非线性行为
DOI：
10.1016/j.compstruc.2012.07.008
复制
发表时间：
2012
影响因子：
4.7
通讯作者：
P. Lourenço
中科院分区：
文献类型：
--
作者：
G. Milani;P. Lourenço
本文采用三维有限元数值程序对砌体桥梁的静力非线性行为进行了数值分析。特别是，三维行为的结构受到偏心荷载时，实际的三维几何形状的桥梁（特别重要的斜拱分析时）和回填引起的加固效果被认为是。该代码是非商业性的，并在这里首次适用于大量元素和不同材料的存在。它依赖于有限元离散化的结构，通过刚性无限阻力八节点平行六面体元素和非线性接口，表现出恶化的机械性能。桥梁的每种材料（拱、扶壁、桥墩和填充物）都使用具有不同本构行为和力学特性的界面进行适当建模。分析了两座真实的比例砌石桥梁，即在英国博尔顿研究所进行的斜交单跨结构试验破坏和由五个圆拱组成的直多跨桥梁，并加载偏心荷载。二维和三维极限分析也进行了充分了解的实际能力的三维方法再现峰值载荷和变形形状在故障，并在同一时间，调查的限制时，由几何形状和载荷偏心引起的横向效应时，二维假设不考虑。
In this paper, the static non-linear behavior of masonry bridges is numerically analyzed by means of a 3D FE numerical code. In particular, the three dimensional behavior of the structures when subjected to eccentric loads, the actual 3D geometry of the bridges (particularly important when skew arches are analyzed) and the strengthening effect induced by the backfill are considered. The code is non-commercial and is applied here for the first time in presence of a very large number of elements and different materials. It relies in a FE discretization of the structure by means of rigid infinitely resistant eight-noded parallelepiped elements and non-linear interfaces, exhibiting deterioration of the mechanical properties. Each material of the bridge (arch, buttresses, piers, and fill) is suitably modeled using interfaces having different constitutive behavior and mechanical properties. Two real scale masonry bridges are analyzed, namely a skew single span structure experimentally tested up to failure at the Bolton Institute, UK and a straight multi span bridge constituted by five circular arches and loaded with an eccentric load. Both 2D and 3D limit analyses are also performed to have full insight into the actual capabilities of the 3D approach to reproduce peak loads and deformed shapes at failure and, at the same time, to investigate limitations of 2D hypotheses when transversal effects induced by geometry and load eccentricity are not considered.