中文摘要：

目的研究三索面地锚式斜拉桥在成桥状态、均布车载及偏载、温度作用等情况下,对主梁应力、变形及拉索索力的影响.方法以沈阳市某三索面地锚式斜拉桥为工程背景,以有限元为基础,通过桥梁专用软件MIDAS/CIVIL建立有限元计算模型,对全桥整体进行静力计算分析.结果恒载状态下三索面地锚式斜拉桥的成桥索力变化比较均匀,距离桥塔由近至远呈现由小至大的分布规律;主梁上缘最大拉应力为17.05 MPa,最大压应力为30.04 MPa;下缘最大拉应力为13.29 MPa,最大压应力为20.71 MPa;主梁竖向最大位移为33.36 mm,塔顶水平位移为28.94 mm.结论三索面地锚式斜拉桥在恒载及活载等其他荷载作用下主梁应力变化平缓,且数值较小,最大应力发生在墩塔梁固结处;在非对称活载作用下地锚侧对称位置斜拉索索力差值很小,主塔横向设计时可不考虑此项差值的影响;温度作用时对三索面地锚式斜拉桥主梁应力及位移的影响较大.

英文摘要：

The objective of this paper is investigating the impact of the completion state,uniformly distributed vehicle load,eccentric load and the temperature on the stress,deformation and the cable force of the main girder of the three cable plane earth anchored cable-stayed bridge. Based on a practical bridge in Shenyang,the finite elements model is founded by the MIDAS / CIVIL package.Then the static calculation analysis of the whole bridge can be carried out. When the vehicle loadremains the same,the cable force of the bridge varies evenly and it increases as the distance with the bridge tower becomes longer. The maximum tensile stress of the upper edge of the main girder is 17. 05 MPa and the maximum compressive stress is 30. 04 MPa. The maximum tensile stress of the bottom edge is 13. 29 MPa and the maximum compressive stress is 20. 71 MPa. The maximum displacement of the main girder is 33. 36 mm,the horizontal displacement on the top of the bridge tower is 28. 94 mm. The stress variation of the main girder show s gentle in the conditions of the constant load,the mobile load and other kinds of loads,and the variation is small. The maximum stress area occurs at the joint of the pipe,the bridge tower and the girder. In the condition of the asymmetric mobile load,the cable force difference of the symmetric position at the anchor side is small,so the impact of the difference can be ignored in the transverse design of the main bridge tow-er. In contrast,the temperature has great influence on the stress and displacement of the main girder.