本文選題：雙肢格構(gòu)柱 + 模板支撐體系��； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：隨著我國大跨度連續(xù)梁橋的發(fā)展，模板支撐體系在橋梁施工中起著不可替代的作用，但是由于模板支撐體系的理論匱乏、管理不規(guī)范、計算失誤等原因，使模板體系在施工過程中出現(xiàn)了嚴(yán)重的倒塌現(xiàn)象。貝雷梁-鋼管柱支撐體系作為模板支撐體系的一種，在預(yù)應(yīng)力現(xiàn)澆箱梁的施工過程中，作為施工平臺得到了越來越廣泛的應(yīng)用。隨著現(xiàn)澆箱梁高度的增加，若要滿足結(jié)構(gòu)承載能力的要求，就必須增大該支撐體系中的主要豎向受力構(gòu)件（鋼管柱）的截面尺寸。但是這一措施的同時也帶來了一系列的問題，如：加大施工難度、浪費資源、加重經(jīng)濟負擔(dān)等。因此格構(gòu)式鋼管貝雷梁支撐體系作為貝雷梁柱式支架的一種強有力的補充應(yīng)運而生。這種體系是通過在鋼管柱之間增加連系件（綴條或綴板），來實現(xiàn)最大限度地節(jié)約工程成本、保證結(jié)構(gòu)受力性能的目的。 由于縱橫向連系件的加入，使模板支撐體系成為空間受力體系，因此我們有必要對格構(gòu)柱-貝雷梁模板支撐體系進行受力分析。本文依托重慶市渝北區(qū)同茂二期豬場溪大橋，運用有限元分析軟件Midas/Civil進行下列分析： ①綜合分析此模板支撐體系所運用到的相關(guān)穩(wěn)定性理論、此理論與有限單元法的結(jié)合以及剪力的存在對結(jié)構(gòu)受力的影響。 ②根據(jù)工程概況并綜合考慮技術(shù)、工期、經(jīng)濟等各方面因素，進行工程各種施工方案的比選，最終確定為貝雷梁柱式支架法，并詳細說明此支架法的施工流程與施工注意事項。 ③運用Midas/Civil對工程的第二聯(lián)第一跨5#~8#進行模型的建立，，得出此模板支撐體系在施工過程中各工況下的穩(wěn)定性系數(shù)及失穩(wěn)模態(tài)，并單獨驗算鋼管柱單肢與跨中處格構(gòu)柱的穩(wěn)定性。 ④從風(fēng)荷載的影響、鋼管柱的幾何尺寸、布置高度、有無連系件、縱橫向布置間距和綴條的面積幾個方面，來分析雙肢格構(gòu)式結(jié)構(gòu)的優(yōu)勢與體系穩(wěn)定性研究的相關(guān)影響因素。 ⑤研究結(jié)論不僅為此類雙肢格構(gòu)柱模板支撐體系的施工與設(shè)計提供科學(xué)依據(jù)，也為今后類似項目的研究工作者提供了可以借鑒的資料和經(jīng)驗。
[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.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U445.3

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