双联塔非对称PC斜拉桥施工控制与分析

发布时间：2018-05-20 21:29

本文选题：双联塔非对称PC斜拉桥 + 施工控制　；参考：《长安大学》2015年硕士论文

【摘要】：随着我国交通建设规模不断发展,斜拉桥的应用愈来愈广泛,其结构型式不断更新。双联塔斜拉桥是近年发展起来的一种新桥型,与普通斜拉桥相比,其桥塔在桥面处设置了刚性联接,有利于结构的整体稳定。本文依托某双联塔非对称桥跨布置的双幅斜拉桥,针对该桥两幅主梁不同步施工的特点,对其进行了施工控制方面的研究。主要研究成果如下:通过有限元方法对依托工程进行双主梁不同步施工全过程仿真模拟,得到了合理的拉索施工初拉力和主梁立模标高,由此计算得到的成桥索力与设计成桥索力吻合较好,误差小于5%,线形满足设计要求。对依托工程进行了参数敏感性分析,应用最小二乘法对敏感参数进行了误差识别,确定该双联塔斜拉桥的主要敏感参数为拉索弹性模量和主梁容重。运用识别后参数修正理论模型,计算得到的新理论高程与实测高程吻合较好。对依托工程双幅主梁不同步施工的相互影响进行分析,以此对不同施工进度主梁的预拱度进行了修正。研究表明:上下游主梁不同步施工对落后主梁合龙前五个节段的主梁标高及其索力有一定影响。与同步施工相比,落后主梁在合龙时悬臂端位移差值达到40mm,相关的成桥索力差值最大达到5.9%。对上游主梁不对称悬臂施工(单侧浇注节段及单侧张拉斜拉索)的影响进行了分析。结果表明:上游主梁不对称悬臂浇注条件下,本幅桥另一侧主梁悬臂端最大位移达到64mm,下游桥幅另一侧悬臂端最大位移达到27mm。同时,施工中单侧张拉斜拉索会导致另一侧主梁悬臂端最大位移114mm。因此在施工中尤其是在合龙前应避免不对称施工。本文研究成果可为双联塔非对称PC斜拉桥的施工控制提供参考。
[Abstract]:With the continuous development of traffic construction in China, cable-stayed bridges are more and more widely used and their structural types are constantly updated. The double-tower cable-stayed bridge is a new type of bridge developed in recent years. Compared with the ordinary cable-stayed bridge, the tower has a rigid connection at the bridge deck, which is conducive to the overall stability of the structure. In this paper, based on the double cable-stayed bridge with asymmetric span arrangement of a double tower, the construction control of the two main beams of the bridge is studied according to the characteristics of asynchronous construction of the two main beams of the bridge. The main research results are as follows: through the finite element method to simulate the whole process of non-synchronous construction of double main beam, the reasonable initial tensile force of cable construction and the elevation of main beam vertical formwork are obtained. The calculated cable force is in good agreement with the designed cable force, and the error is less than 5. The linear shape meets the design requirements. Based on the parameter sensitivity analysis of the supporting project and the error identification of the sensitive parameters by using the least square method, the main sensitive parameters of the double-tower cable-stayed bridge are determined to be the elastic modulus of cables and the bulk weight of the main beam. The new theoretical height is in good agreement with the measured height by using the modified theoretical model. Based on the analysis of the mutual influence of the double main beam construction, the pre-arch degree of the main beam with different construction progress is corrected. The results show that the asynchronous construction of upstream and downstream main beams has a certain influence on the elevation and cable force of the main beams in the first five segments of the backward main girder closure. Compared with the synchronous construction, the displacement difference of the cantilever end of the backward main beam is 40 mm when closed, and the maximum value of the cable force difference of the related bridge is 5.9 mm. The influence of asymmetric cantilever construction of upstream main girder (one side pouring section and one side tension cable) is analyzed. The results show that under the condition of asymmetric cantilever pouring, the maximum displacement of the cantilever end on the other side of the bridge is 64mm, and the maximum displacement of the cantilever end on the other side of the downstream bridge is 27mm. At the same time, the maximum displacement of the cantilever end of the other side of the main girder will be 114 mm. Therefore, asymmetric construction should be avoided in construction, especially before closing. The research results of this paper can provide reference for the construction control of double-tower asymmetrical PC cable-stayed bridge.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U445.4;U448.27

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