非线性有限元法分析预应力砌体墙结构

Non-linear Analysis of Prestressed Masonry By Finite Element Method

集中配筋砌体中加预应力的砖砌体结构是一种能减轻砌体自重、改善结构抗震性能、提高房屋层数的合理结构形式。采用非线性有限元法对预应力砖砌体结构进行模拟分析 ,确定了钢筋混凝土的本构关系 ,并根据前人的试验及经验公式 ,建立了新的砌体破坏准则及砌体在双轴作用下的本构关系 ,分析了预应力对砌体结构的贡献。算例结果表明 ,施加预应力能延缓砌体结构的开裂。

The prestressed masonry is a kind of rational structure form that can lighten the weigh of masonry, improve its aseismatic behavior and increase the height of building. This paper analyses the prestressed masonry by nonlinear finite element method. Here the constitutive model of reinforced concrete and masonry is established. A new failure envelop for plain brick masonry is also set. And the contribution of prestressed reinforcement to masonry is considered. The example shows that prestressed force can delay the crack of masonry and improve its ultimate bearing capacity.