混凝土折线塔斜拉桥成桥索力确定的研究  

Study of Cable Force Determination for Completed Bridge of a Concrete Cable-Stayed Bridge with Kinked Pylons

作　　者：王福春[1,2] 梁力[1] 李鑫[1] 

机构地区：[1]东北大学土木工程研究所,辽宁沈阳110004 [2]沈阳市市政工程设计研究院,辽宁沈阳110015

出　　处：《桥梁建设》2011年第1期52-54,63,共4页Bridge Construction

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载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。The main bridge of Fumin Bridge in Shenyang City is a concrete cable-stayed bridge with kinked pylons and with span arrangement（89＋242＋89） m.To determine the reasonable cable forces of the completed bridge of the bridge,the cable forces are calculated and analyzed by the least bending energy method in combination with the assumed loading and internal force balance methods.The dimensions of the initial cross section of the main girder are obtained according to the static balance conditions,the reasonable state of the completed bridge dead load having little bending moment in the main girder and pylons and almost 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 all controlled sections under the most unfavorable load combination can be within the allowable range as specified in the codes.The results of the calculation and analysis indicate that the method for determination of the cable forces of the completed bridge of the kinked pylon cable-stayed bridge can be the same with that of the completed bridge of the straight pylon cable-stayed bridge and the cable forces take on a redistribution 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.

关 键 词：斜拉桥 折线塔 成桥恒载索力 初张力 

分 类 号：U448.27[建筑科学—桥梁与隧道工程] U442.5[交通运输工程—道路与铁道工程]