宽断面单箱单室连续梁桥施工控制及横向内力分析

发布时间：2018-01-03 19:04

本文关键词：宽断面单箱单室连续梁桥施工控制及横向内力分析　出处：《东北林业大学》2014年硕士论文　论文类型：学位论文

【摘要】：为适应交通现代化的需求,公路桥梁开始向多车道发展,单幅桥梁的横向宽度不断增加。同时,随着对桥梁结构简化和施工方便等要求的提高,国内外建造的预应力混凝土连续梁桥中,采用能适应较宽桥梁的大悬臂单箱单室宽箱截面形式越来越多。对于悬臂施工的预应力混凝土连续梁桥,特别是宽断面单箱单室连续梁桥施工过程中的不确定性因素很多,这些因素必将造成结构施工和成桥状态与设计要求之间的差异,所以对宽断面单箱单室连续梁桥的施工控制是十分必要的。施工控制中对桥梁进行的施工阶段仿真分析是按有限元平面杆系进行的计算,为了全面了解宽断面单箱单室连续梁桥受力特性,对其进行横向内力分析也是必要的。本文以牡丹江市青梅大桥主桥为工程背景,对宽断面单箱单室连续梁桥施工控制中的几何变形控制、应力控制、合拢施工控制等问题进行了研究,并结合其他不同断面形式对宽断面单箱单室连续梁桥的横向内力特性进行了分析,具体研究内容如下： (1)在施工监控过程中,针对青梅大桥主桥的结构特点,采用正装分析法利用Midas/Civil有限元分析软件进行施工过程模拟分析；在标高误差预测时采用了在连续梁桥施工监控中不常用到的基于LS-SVM的预测方法,达到了良好的预测效果,并与灰色系统理论和BP神经网络预测结果进行对比,发现基于LS-SVM法的预测精度最高,说明此种方法在施工控制中应用是可行的；对应力监测结果做了详细的论述,从而掌握了宽断面单箱单室连续梁桥在施工过程中的应力变化特点；对合拢施工控制中关键问题进行了阐述。 (2)在横向内力分析时,对包括青梅大桥主桥中跨跨中断面、1/4断面在内的,以及在跨中断面基础上变化得到的3种连续箱梁断面利用加弹性支承框架法进行了横向弯矩计算,结合不同断面横向弯矩计算结果,综合分析宽断面单箱单室连续箱梁桥的横向内力状态。本文在施工监控的实施、横向内力分析中都采用了较好的方法,均取得了良好的效果,对宽断面单箱单室连续梁桥的施工控制及横向受力特点得到了进一步的掌握,可为同类桥梁的施工控制及横向内力分析提供参考和依据。
[Abstract]:In order to meet the needs of the traffic modernization , the highway bridge starts to develop to the multi - lane , and the transverse width of the single bridge is increasing . At the same time , as the bridge structure is simplified and the construction is convenient and so on , there are many uncertainties in the construction process of the prestressed concrete continuous beam bridge , especially the wide cross - section single - box single - chamber continuous beam bridge . Taking the main bridge of Qingmei Bridge in Mudanjiang city as the engineering background , the problems of geometric deformation control , stress control and closed construction control in the construction control of single - chamber continuous beam bridge with wide section are studied , and the transverse internal force characteristics of single - chamber continuous beam bridge with wide cross - section are analyzed in combination with other different section forms . The specific research contents are as follows : ( 1 ) In the process of construction supervision , aiming at the structural characteristics of the main bridge of Qingmei Bridge , the construction process simulation analysis is carried out by means of the method of positive load analysis using the Midas / Civil finite element analysis software , and the forecasting result based on LS - SVM is adopted in the prediction of the elevation error , which shows that the application of the LS - SVM method is the highest , and the stress change characteristics of the continuous beam bridge in the construction process of the single - chamber single - chamber continuous beam bridge are mastered , and the key problems in the closed construction control are expounded . ( 2 ) In the analysis of lateral internal force , the transverse bending moment calculation of three continuous box girder sections , including cross section , section 1 / 4 section and cross section of the main bridge of Qingmei Bridge , is carried out by means of the elastic support frame method , and the transverse internal force state of the single chamber continuous box girder bridge with wide section is comprehensively analyzed in combination with the calculation results of transverse bending moments of different sections . In this paper , a good method is adopted in the implementation of construction monitoring and lateral internal force analysis , and the construction control and transverse force characteristics of single - chamber continuous beam bridge with wide cross - section are further mastered , which can provide reference and basis for the construction control and lateral internal force analysis of similar bridges .

【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

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