【摘要】 为研究刚性区域对斜拉式桁架桥受力的影响,运用有限元程序分别建立了考虑节点刚域效应与不考虑刚域效应的模型,分析了斜拉式桁架桥节点刚域对桥梁在施工过程中以及成桥后的标高、内力的影响。结果表明:节点刚性区域对斜拉式桁架桥施工过程中以及成桥后的标高影响较小;对成桥后各杆件的轴力影响较小,普遍小于3%;但对下弦杆的弯矩影响较大,最大可达20%。更多还原

【Abstract】 In order to analyze the influence of nodal rigid zone on the mechanics characteristic of oblique-pulling truss bridge,two finite element models are presented, one model takes the nodal rigid zones into consideration and the other one does not.By the comparison between the two calculation results,the effect rules of elevation and internal force during both the construction stage and the service stage that caused by the nodal rigid zones are obtained.The results show that the effect of the nodal rigid zones on the elevation is small in both construction and service stages.The effects to the axial force of the structure in the service stage is so small that they are all less than 3%,but the effects on the moment of the lower chords is so pronounced that it can not be neglected,which can reach 20%.3 tabs,6 figs,10 refs.更多还原