鄭萬鐵路尼爾森體系鋼管混凝土拱橋施工監(jiān)控及吊桿張拉控制優(yōu)化研究
發(fā)布時(shí)間：2018-07-21 11:36
【摘要】：隨著拱橋在我國高速鐵路修建中的迅猛發(fā)展,尼爾森體系鋼管混凝土拱橋由于其整體剛度大、外形美觀、經(jīng)濟(jì)效益好、安全可靠、跨越能力強(qiáng)等優(yōu)越性受到鐵路建設(shè)者的熱捧。為了避免在橋梁建造過程中出現(xiàn)結(jié)構(gòu)垮塌等重大責(zé)任事故,保證結(jié)構(gòu)施工質(zhì)量,盡可能完美地實(shí)現(xiàn)設(shè)計(jì)意圖,國家相關(guān)部門對技術(shù)含量高的橋梁建設(shè)引入了第三方進(jìn)行施工過程監(jiān)控。國內(nèi)、外橋梁施工監(jiān)控大多是針對大跨度斜拉橋、連續(xù)剛構(gòu)橋等橋型,而針對尼爾森體系鋼管混凝土拱橋的施工監(jiān)控方面,缺乏比較系統(tǒng)性、有針對性的施工監(jiān)控技術(shù)措施和建設(shè)實(shí)踐。本文結(jié)合尼爾森體系鋼管混凝土拱橋的起源和國內(nèi)外發(fā)展?fàn)顩r,介紹了該種橋梁結(jié)構(gòu)的特點(diǎn),以正在建設(shè)中的鄭萬鐵路128m尼爾森體系鋼管混凝土拱橋?yàn)檠芯繉ο?主要做了如下幾方面的工作:1.利用有限元軟件Midas/civil建立起三維桿系結(jié)構(gòu)仿真模型,模擬了全橋各個(gè)施工階段,并對拱橋關(guān)鍵結(jié)構(gòu)的建模方法做出詳細(xì)總結(jié);2.編制了全面的施工控制方案,介紹了各個(gè)階段測量和監(jiān)控的技術(shù)關(guān)鍵點(diǎn),特別介紹了對支架監(jiān)控的新的技術(shù)手段,從而保證了主梁澆筑支架體系的結(jié)構(gòu)安全;3.利用最小二乘原理結(jié)合倒裝分析法進(jìn)行控制參數(shù)的誤差識別。通過舉例分析,對比參數(shù)真實(shí)值與參數(shù)修正值的符合度,驗(yàn)證了對參數(shù)進(jìn)行修正后,能夠得到高精度的參數(shù)估計(jì)值。因而在施工過程中通過參數(shù)識別修正,建立起更加符合實(shí)際工程的有限元計(jì)算模型,能夠更好的指導(dǎo)施工有序進(jìn)行;4.在有限元模型更加符合現(xiàn)場實(shí)際的基礎(chǔ)上,分別運(yùn)用影響矩陣法和倒裝法確定吊桿初張拉力,介紹了兩種方法的計(jì)算原理和過程,提出了兩種方法均以吊桿索力設(shè)計(jì)值為控制目標(biāo),兼顧結(jié)構(gòu)的變形和內(nèi)力。通過兩種方法在不同張拉方案中的應(yīng)用發(fā)現(xiàn):將影響矩陣法和正裝迭代分析相結(jié)合,在確定吊桿初拉力方面具有更大的優(yōu)勢。5.針對不同的吊桿張拉順序,利用影響矩陣法結(jié)合迭代分析,計(jì)算合理的吊桿初始張拉力,再進(jìn)行正裝分析,選擇符合現(xiàn)場實(shí)際、易于實(shí)施的吊桿張拉方案。本文通過對尼爾森體系鋼管混凝土拱橋施工控制的研究,為該橋成橋狀態(tài)盡可能接近設(shè)計(jì)狀態(tài)奠定理論基礎(chǔ),可為同類型拱橋的施工監(jiān)控提供借鑒。
[Abstract]:With the rapid development of arch bridge in the construction of high-speed railway in our country, Nielsen system concrete filled steel tube arch bridge is popular with railway builders because of its advantages such as large stiffness, beautiful appearance, good economic benefit, safety and reliability, strong span ability and so on. In order to avoid major accidents such as structural collapse in the process of bridge construction, to ensure the construction quality of the structure, and to realize the design intention as perfectly as possible, The relevant departments of the state have introduced a third party to monitor the construction process of the high-tech bridge construction. In China, the construction monitoring of external bridges is mostly aimed at long-span cable-stayed bridges, continuous rigid frame bridges and other bridge types, but for Nielsen system concrete filled steel tube arch bridge construction monitoring, there is a lack of systematic, Targeted construction monitoring technical measures and construction practice. Combined with the origin of Nielsen system concrete-filled steel tube arch bridge and the development situation at home and abroad, this paper introduces the characteristics of the bridge structure, taking the 128m concrete filled steel tube arch bridge of Zhengwan-Wan railway as the research object. I mainly did the following work: 1. By using the finite element software Midas / civil, the simulation model of 3D bar structure is established, the construction stages of the whole bridge are simulated, and the modeling method of the key structure of the arch bridge is summarized in detail. The overall construction control scheme is worked out and the key points of measurement and monitoring in each stage are introduced, especially the new technical means of support monitoring and control, so as to ensure the structural safety of the main beam pouring support system. The error identification of control parameters is carried out by using least square principle and inversion analysis method. Through the analysis of examples, the coincidence between the real parameter value and the parameter correction value is contrasted, and it is verified that the parameter estimation value with high accuracy can be obtained after the parameters are corrected. Therefore, through the parameter identification and correction in the construction process, the finite element calculation model which is more in line with the actual engineering can be established, which can better guide the construction in an orderly manner. On the basis that the finite element model is more in line with the field reality, the influence matrix method and the inverted method are used to determine the initial tension of the suspender respectively. The calculation principle and process of the two methods are introduced. Both methods take the design value of cable force of suspension rod as the control target and give consideration to the deformation and internal force of the structure. Through the application of two methods in different tensioning schemes, it is found that the combination of the influence matrix method and the formal iterative analysis has a greater advantage in determining the initial tension of the suspender. According to the different tension sequence of the suspenders, the influence matrix method is used to calculate the reasonable initial tension of the suspenders, and then the formal fitting analysis is carried out to select the tension schemes which are in line with the actual situation in the field and are easy to carry out. Through the study of the construction control of Nielsen system concrete filled steel tube arch bridge, this paper lays a theoretical foundation for the bridge to be as close as possible to the design state, and can provide reference for the construction monitoring of the same type of arch bridge.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U445.4
[Abstract]:With the rapid development of arch bridge in the construction of high-speed railway in our country, Nielsen system concrete filled steel tube arch bridge is popular with railway builders because of its advantages such as large stiffness, beautiful appearance, good economic benefit, safety and reliability, strong span ability and so on. In order to avoid major accidents such as structural collapse in the process of bridge construction, to ensure the construction quality of the structure, and to realize the design intention as perfectly as possible, The relevant departments of the state have introduced a third party to monitor the construction process of the high-tech bridge construction. In China, the construction monitoring of external bridges is mostly aimed at long-span cable-stayed bridges, continuous rigid frame bridges and other bridge types, but for Nielsen system concrete filled steel tube arch bridge construction monitoring, there is a lack of systematic, Targeted construction monitoring technical measures and construction practice. Combined with the origin of Nielsen system concrete-filled steel tube arch bridge and the development situation at home and abroad, this paper introduces the characteristics of the bridge structure, taking the 128m concrete filled steel tube arch bridge of Zhengwan-Wan railway as the research object. I mainly did the following work: 1. By using the finite element software Midas / civil, the simulation model of 3D bar structure is established, the construction stages of the whole bridge are simulated, and the modeling method of the key structure of the arch bridge is summarized in detail. The overall construction control scheme is worked out and the key points of measurement and monitoring in each stage are introduced, especially the new technical means of support monitoring and control, so as to ensure the structural safety of the main beam pouring support system. The error identification of control parameters is carried out by using least square principle and inversion analysis method. Through the analysis of examples, the coincidence between the real parameter value and the parameter correction value is contrasted, and it is verified that the parameter estimation value with high accuracy can be obtained after the parameters are corrected. Therefore, through the parameter identification and correction in the construction process, the finite element calculation model which is more in line with the actual engineering can be established, which can better guide the construction in an orderly manner. On the basis that the finite element model is more in line with the field reality, the influence matrix method and the inverted method are used to determine the initial tension of the suspender respectively. The calculation principle and process of the two methods are introduced. Both methods take the design value of cable force of suspension rod as the control target and give consideration to the deformation and internal force of the structure. Through the application of two methods in different tensioning schemes, it is found that the combination of the influence matrix method and the formal iterative analysis has a greater advantage in determining the initial tension of the suspender. According to the different tension sequence of the suspenders, the influence matrix method is used to calculate the reasonable initial tension of the suspenders, and then the formal fitting analysis is carried out to select the tension schemes which are in line with the actual situation in the field and are easy to carry out. Through the study of the construction control of Nielsen system concrete filled steel tube arch bridge, this paper lays a theoretical foundation for the bridge to be as close as possible to the design state, and can provide reference for the construction monitoring of the same type of arch bridge.
【學(xué)位授予單位】：蘭州交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：U445.4
【參考文獻(xiàn)】
相關(guān)期刊論文 前10條
1 蔡如松;王燦;王瑩;;剛性吊桿系桿拱橋吊桿更換施工監(jiān)控[J];中國水運(yùn)(下半月);2017年01期
2 劉念琴;李勇;張承;曹邏津;周，
本文編號：2135397
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