纵梁(肋)高度对正交异性板钢桥面系受力影响分析  

Influence of longitudinal Beam(rib)Height on the Stress of the Orthotropic Plate of Steel Bridge

作　　者：方桂芬[1] FANG Gui-fen(Bridge ＆ Tunnel Design Department, China Railway First Survey and DesignInstitute Group Co.,Ltd.,Xi？an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司桥隧处,西安710043

出　　处：《铁道标准设计》2016年第12期71-74,共4页Railway Standard Design

摘　　要：正交异性板各个构件的选用关系着钢桥面系的安全性及经济性,通过有限元分析软件,建立桥面系板单元模型,对正交异性板多横梁体系纵梁、纵肋高度变化时桥面系各部分受力分析,总结纵梁（肋）高度变化对桥面板、横梁以及横梁与纵梁（肋）相交处挖孔部位受力的影响趋势,得出结论：增加纵梁高度,纵梁自身正应力逐渐增大,U 肋正应力逐渐减小;横梁U 肋挖孔处主拉应力增大,横肋相应处主拉应力减小,但减小或增大的幅度较小.改变T 形纵梁高度,对横梁整体受力及桥面板影响甚小,可忽略不计, T 形纵梁的合理取值范围为横梁高度的0.35-0 . 4倍; U 肋高度过大或者过小,桥面板应力的均匀性均不好,且主拉应力均较大.增大U 肋高度,纵梁正应力逐渐减小, U 肋自身应力并未成线性变化趋势,而是呈“锯齿”形变化趋势.改变U 肋高度对桥面板应力影响均较小,可忽略不计, U 肋的合理高度取值范围为240-280 mm.The selection of components is critical to the safety and economy of bridge floor system. Theplate element model of the deck is established with finite element analysis software to analyze every part ofthe orthotropic plate when the height of longitudinal beam or rib is changed, the influences of the changeof the height of longitudinal beam or rib on the plate, cross beam, intersect excavated area of longitudinalbeam（ rib） and the cross beam are summed up. The results show that increasing the height of thelongitudinal beam increases gradually the normal stress of longitudinal beam itself, and decreasesgradually the normal stress of U rib; the principal tensile stress of the rib beam increases near the holewhere the U rib cross, the principal tensile stress of corresponding local of Cross rib decreases, but theextent of decrease or increase is smaller; changing T girder height has little impact on the global stress ofthe cross beam, and can be ignored; the reasonable height of longitudinal beam is 0. 35-0. 4 time of thecross beam; too big or too small of the height of U ribs leads to undesirable stress uniformity of the bridgedeck, resulting in bigger principal tensile stress; increasing the height of the U rib results in gradualdecrease of the normal stress of the longitudinal beam, and the stress of U rib itself is not in a lineartrend, but in a “zigzag” changing trend; changing U rib height has little impact on the global stress ofthe bridge deck slab and the reasonable height range of U rib is 240-280 mm.

关 键 词：铁路钢桥 纵梁高度 纵肋高度 桥面系 正应力 主拉应力 横梁 横肋 挖孔方式 

分 类 号：U443.32[建筑科学—桥梁与隧道工程]