开口加劲肋正交异性钢桥面铺装力学行为特性研究

为了研究开口加劲肋正交异性钢桥面铺装的力学行为特性,通过建立钢箱梁和铺装整体三维有限元模型,分析了荷载作用下铺装层最大拉应力、铺装与钢板层间最大剪应力等技术指标的变化及分布规律。得到如下结论:拉应力是导致铺装出现开裂破坏的主要原因,疲劳裂缝应沿桥梁的纵向;当以拉应力作为控制指标时,钢桥面铺装在距离横隔板0.4 m范围内受力最为不利;开口加劲肋正交异性钢桥面铺装应变水平远大于一般沥青路面;铺装对车辆荷载的应力应变响应具有很强的局部效应;铺装与钢板层间剪应力较大,在铺装结构设计时应注意选择具有较强抗剪强度的粘结材料。

Research on Mechanical Behavior of Wearing Surfaces on Orthotropic Steel Decks with Open Ribs

In order to investigate the mechanical behavior of wearing surfaces subject to wheel loads on orthotropic steel decks with open ribs,a 3D finite element model which consists of steel box girder and surfacings was established.Distribution and variation of technical indictors such as maximum tensile stress in surfacing and maximum shear stress between surfacing and underlying steel plate were studied.Analysis results show that(1) tensile stress is the main reason of cracking of surfacing,fatigue cracking ought to be longitudinal;(2) areas at a distance 0.4 m from diaphragm are the worst positions for loading when tensile stress is the governing index;(3) strain level of the surfacing is much larger than that of ordinary bituminous pavement,local effect of deck pavement on orthotropic steel decks with open ribs is strong.