混凝土折线塔斜拉桥成桥索力确定的研究

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发布时间：2021-09-25

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混凝土折线塔斜拉桥成桥索力确定的研究
王福春，粱
(1．东北大学土木工程研究所，辽宁沈阳 110004；2．
力，李鑫
沈阳市市政工程设计研究院，辽宁沈阳 110015)
摘要：沈阳市富民桥主桥是一座 89 m+242 m+89 m 的混凝土折线塔斜拉桥，为确定合理
的成桥索力，采用最小弯曲能量法并结合假载法和内力平衡法进行计算分析。根据静力平衡条件
得到主梁初始断面尺寸；利用最小弯曲能量法得到主梁和桥塔弯矩较小、索力基本均匀的成桥恒载
合理状态；利用假载法进行验算，以保证各控制断面在最不利荷栽组合时的弯矩值在规范允许范围
内。研究表明，折线塔斜拉桥成桥索力确定可采用与直线塔相同的方法；索力距离桥塔由近至远呈
现由大到小、再由小至大的分布规律，中跨索力大于边跨索力；两塔相应位置索力大小不同。
关键词：斜拉桥；折线塔；成桥恒载索力；初张力
中图分类号：U448．27；U442．5 文献标志码：A
Study of Cable Force Determ ination for Completed Bridge
of a Concrete Cable—Stayed Bridge with Kinked Pylons
，AN G Fu—chun 一，LJAN G Li ，LJ Xin
(1．Research Institute of Civil Engineering，Northeastern University，Shenyang 110004，China；
2．Shenyang Municipal Engineering Design and Research Institute，Shenyang 110015，China)
Abstract：The m ain bridge of Fumin Bridge in Shenyang City is a concrete cable—stayed bridge
with kinked pylons and with span arrangem ent(89+ 242+ 89)m ． To determine the reasonable
cable forces of the com pleted bridge of the bridge，the cable forces are calculated and analyzed by
the least bending energy method in com bination with the assumed loading and internal force bal—
ance methods． The dimensions of the initial cross section of the main girder are obtained accord—
ing tO the static balance conditions，the reasonable state of the completed bridge dead load having
little bending mom ent in the main girder and pylons and alm ost uniform cable forces are obtained
by the least bending energy method and the checking calculation is made by the assumed loading
method in order to ensure that the bending moment values of alI controlled sections under the
most unfavorable load com bination can be within the allowable range as specified in the codes．
The results of the calculation and analysis indicate that the m ethod for determination of the cable
forces of the com pleted bridge of the kinked pylon cable—stayed bridge can be the sam e with that
of the completed bridge of the straight pylon cable——stayed bridge and the cable forces take on a re——
distribution law from the great to the little and then from the little to the great from the near tO
the distant from the pylons．The cable forces of the central span are greater than those of the side
spans and the forces in the corresponding locations of the two pylons are different．
Key words：cable—stayed bridge；kinked pylon；cable force of completed bridge dead load；in—