自锚式斜拉—悬索协作体系桥的合理成桥状态分析  

Analysis of Rational Finished State of Self-anchored Cable-Stayed-Suspension Bridge

作　　者：李中培[1] 袁明军 刘孝武 张治成[1] LI Zhong-pei;YUAN Ming-jun;LIU Xiao-wu;ZHANG Zhi-cheng(School of Civil Engineering and Architecture, Zhejiang University, Hangzhou 310058, China;Ningbo Bypass Access Roads Construction Co. , Ltd. , Ningbo 315010, China)

机构地区：[1]浙江大学建筑工程学院,杭州市310058 [2]宁波市绕城高速连接线建设有限公司,宁波市315010

出　　处：《公路》2018年第7期132-137,共6页Highway

摘　　要：合理成桥状态是自锚式斜拉—悬索协作体系设计中的关键问题。根据其结构特点,基于Midas Civil专业软件平台,以一座即将建设的斜拉-悬索协作体系——宁波常洪大桥为例,利用主梁和主塔弯矩最小、线形最佳的原则,探讨了一种三步骤迭代分析法：首先采用分段弹性悬链线法确定悬索大缆的初始线形及内力,然后耦合斜拉桥结构部分,采用弯曲能量最小法确定斜拉索的初始内力,最后采用优化迭代的方法微调斜拉索和主缆内力以获取协作体系的合理成桥状态。实际工程应用分析结果表明,常洪大桥成桥状态的斜拉索内力分布合理;主梁和桥塔的弯矩应力较小,塔梁基本处于轴压状态;斜—吊混合区主梁弯矩变化平缓;主梁线形平顺;协作体系中跨主梁的弯矩及变形受斜拉索和主缆内力的影响较为敏感。The determination of the rational as-built state is a pivotal problem in the design of self- anchored cable-stayed-suspension synergetic system. According to its structural characteristics, based on the Midas Civil software platform and the case study of the Changhong Bridge at Ningbo, a cable-stayed - suspension system to be constructed, on the principle of minimum moment of main girder and mare pylon and optimal alignment, a three-step iteration method is discussed, firstly, the initial elastic line and internal forces of main cables are determined by piecewise elastic catenary theory; and then. the initial internal forces of the stay cables is determined by the minimum bending energy on the basis of the structural part with coupling cable - stayed brldge; finally, the optimal iteration method is used to fine tune the internal forces of cables and main cables in order to obtain the rational finished state of the cooperative system. The analysis of practical engineering application shows that： the distribution of internal forces of stay cables is reasonable in Changhong Bridge; the moment stress of the main girder and towers is negligible, both the main girder and towers are in the axial compression state; the bending moment of the main girder in inclined mixed zone is gentle; the alignment of the main girder is smooth; and the bending moment and deformation of the main girder in the cooperative system are more sensitive to the influence of the internal forces of the stay cables and the main cables.

关 键 词：斜拉-悬索 协作体系 自锚式 合理成桥状态 分析 

分 类 号：U441.5[建筑科学—桥梁与隧道工程]