双肢格构柱—贝雷梁模板支撑体系空间力学行为分析

发布时间：2018-04-26 07:11

本文选题：双肢格构柱 + 模板支撑体系　；参考：《重庆大学》2014年硕士论文

【摘要】：随着我国大跨度连续梁桥的发展，模板支撑体系在桥梁施工中起着不可替代的作用，但是由于模板支撑体系的理论匮乏、管理不规范、计算失误等原因，使模板体系在施工过程中出现了严重的倒塌现象。贝雷梁-钢管柱支撑体系作为模板支撑体系的一种，在预应力现浇箱梁的施工过程中，作为施工平台得到了越来越广泛的应用。随着现浇箱梁高度的增加，若要满足结构承载能力的要求，就必须增大该支撑体系中的主要竖向受力构件（钢管柱）的截面尺寸。但是这一措施的同时也带来了一系列的问题，如：加大施工难度、浪费资源、加重经济负担等。因此格构式钢管贝雷梁支撑体系作为贝雷梁柱式支架的一种强有力的补充应运而生。这种体系是通过在钢管柱之间增加连系件（缀条或缀板），来实现最大限度地节约工程成本、保证结构受力性能的目的。由于纵横向连系件的加入，使模板支撑体系成为空间受力体系，因此我们有必要对格构柱-贝雷梁模板支撑体系进行受力分析。本文依托重庆市渝北区同茂二期猪场溪大桥，运用有限元分析软件Midas/Civil进行下列分析： ①综合分析此模板支撑体系所运用到的相关稳定性理论、此理论与有限单元法的结合以及剪力的存在对结构受力的影响。 ②根据工程概况并综合考虑技术、工期、经济等各方面因素，进行工程各种施工方案的比选，最终确定为贝雷梁柱式支架法，并详细说明此支架法的施工流程与施工注意事项。 ③运用Midas/Civil对工程的第二联第一跨5#~8#进行模型的建立，，得出此模板支撑体系在施工过程中各工况下的稳定性系数及失稳模态，并单独验算钢管柱单肢与跨中处格构柱的稳定性。 ④从风荷载的影响、钢管柱的几何尺寸、布置高度、有无连系件、纵横向布置间距和缀条的面积几个方面，来分析双肢格构式结构的优势与体系稳定性研究的相关影响因素。 ⑤研究结论不仅为此类双肢格构柱模板支撑体系的施工与设计提供科学依据，也为今后类似项目的研究工作者提供了可以借鉴的资料和经验。
[Abstract]:With the development of long-span continuous beam bridge in China, formwork support system plays an irreplaceable role in bridge construction, but due to the lack of theory of formwork support system, non-standard management, calculation errors and other reasons. So that the formwork system in the construction process has a serious collapse phenomenon. As a kind of formwork support system, the beam-steel column bracing system is more and more widely used as a construction platform in the construction process of prestressed cast-in-place box girder. With the increase of the height of cast-in-place box girder, the section size of the main vertical bearing member (column of steel pipe) in the bracing system must be increased to meet the requirements of the bearing capacity of the structure. But this measure also brings a series of problems, such as increasing construction difficulty, wasting resources, increasing economic burden and so on. Therefore, the lattice type steel pipe beam-beam support system as a powerful supplement of Beilai Liang Zhu support came into being. The purpose of this system is to save the engineering cost and ensure the mechanical performance of the structure by adding the connecting parts (bars or plates) between the steel pipe columns. Because of the addition of longitudinal and transverse connecting parts, the formwork bracing system becomes the spatial stress system, so it is necessary to analyze the force of the formwork bracing system of lattice column and Berelli beam. Based on Tongmao Phase II Pig Fangxi Bridge in Yubei District, Chongqing, the following analysis is carried out by using finite element analysis software Midas/Civil: The main results are as follows: 1. The related stability theory used in the formwork bracing system is analyzed synthetically. The combination of the theory and the finite element method and the influence of the shear force on the structure force are analyzed. 2According to the general situation of the project and synthetically considering various factors such as technology, time limit, economy and so on, the comparison and selection of various construction schemes are carried out, and the final method is determined as Belay Liang Zhu type bracket method, and the construction flow and construction precautions of this support method are explained in detail. (3) using Midas/Civil to build the model of the second first span of the project, the stability coefficient and instability mode of the formwork bracing system under each working condition are obtained, and the stability of the steel pipe column with single leg and the lattice column in the middle of the span is calculated separately. (4) from the influence of wind load, the geometric dimension of steel pipe column, the height of the steel pipe column, the connection or not, the distance between longitudinal and horizontal arrangement and the area of the strip, this paper analyzes the advantages of the double-legged lattice structure and the relative factors influencing the stability of the system. The conclusions of the study not only provide scientific basis for the construction and design of the formwork bracing system, but also provide reference materials and experiences for researchers of similar projects in the future.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.3

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