本文選題：下承式鋼管拱　切入點(diǎn)：合理成橋索力　出處：《長安大學(xué)》2015年碩士論文

【摘要】：本文針對鋼管混凝土拱橋索力調(diào)整的研究現(xiàn)狀,結(jié)合工程實(shí)例,運(yùn)用有限元分析軟件Civil對鋼管混凝土拱橋成橋索力優(yōu)化和施工狀態(tài)控制、成橋影響參數(shù)敏感性以及目前較多運(yùn)用在斜拉橋上的全程不張拉吊桿的情況在拱橋上的適用性等,作了一定的研究分析。首先建立鋼管混凝土吊桿張拉力優(yōu)化模型,采用最小彎曲能量法以及影響矩陣法提出了系桿拱橋成橋索力優(yōu)化的實(shí)用方法,引入了抗彎剛度折減系數(shù)以及軸向剛度擴(kuò)大系數(shù)的概念,并且對成橋狀態(tài)吊桿張拉力進(jìn)行了優(yōu)化,并分析吊桿張拉力優(yōu)化后橋梁結(jié)構(gòu)的受力性能。其次,本文按照設(shè)計(jì)順序建立施工階段正裝模型,采用基于影響矩陣的未知荷載系數(shù)法確定各個(gè)吊桿施工階段所需的張拉力,并且通過計(jì)算分析一次張拉與分步張拉的優(yōu)缺點(diǎn),按照計(jì)算得出的兩種施工方案,對結(jié)構(gòu)進(jìn)行正裝分析,最終與成橋階段目標(biāo)索力吻合;文中還研究了張拉順序?qū)Y(jié)構(gòu)的影響并作出了優(yōu)化。本文還指出了全程不張拉吊桿只依靠自重達(dá)到成橋時(shí),內(nèi)力狀態(tài)不滿足要求,所以不建議采用。最后,本文還對結(jié)構(gòu)成橋階段受力狀態(tài)進(jìn)行了參數(shù)敏感性分析,并且將其歸類,指出對于敏感性因素,在計(jì)算中應(yīng)當(dāng)準(zhǔn)確模擬,力求與實(shí)際施工狀態(tài)吻合良好,這樣就要求從施工角度嚴(yán)格控制施工質(zhì)量,盡量做到風(fēng)險(xiǎn)預(yù)判和合理的施工監(jiān)測,確保結(jié)構(gòu)在成橋之后內(nèi)力與線形等各方面結(jié)果滿足設(shè)計(jì)目標(biāo)。由此,通過對該實(shí)例橋的計(jì)算分析,筆者了解了鋼管拱的設(shè)計(jì)與施工流程及其重點(diǎn)環(huán)節(jié),也期望為后續(xù)讀者在鋼管拱的學(xué)習(xí)方面提供一點(diǎn)借鑒意義。
[Abstract]:In this paper, according to the current research situation of cable force adjustment of concrete-filled steel tubular arch bridge, combined with engineering examples, the cable force optimization and construction state control of concrete-filled steel tubular arch bridge are optimized by using finite element analysis software Civil. The influence of the bridge on the sensitivity of the parameters and the applicability of the non-tension suspenders used in cable-stayed bridges during the whole process are studied and analyzed in this paper. Firstly, an optimization model of tension force of concrete filled steel tubular suspenders is established. A practical method for cable force optimization of tied arch bridge is presented by using minimum bending energy method and influence matrix method. The concepts of bending stiffness reduction coefficient and axial stiffness expansion coefficient are introduced. And the tension of the suspension rod is optimized, and the mechanical performance of the bridge structure is analyzed. Secondly, according to the design sequence, this paper establishes the normal fitting model in the construction stage. The method of unknown load coefficient based on influence matrix is used to determine the tensile force required in each stage of construction of suspenders, and the advantages and disadvantages of single tension and step tension are analyzed through calculation, and two construction schemes are obtained according to the calculation. In this paper, the influence of tension sequence on the structure is studied and optimized. It is also pointed out that when the non-tensioning suspenders reach the bridge only by self-weight during the whole process, the effect of tension sequence on the structure is also studied and optimized. The internal force state is not satisfied with the requirement, so it is not recommended to adopt. Finally, the sensitivity analysis of the stress state of the structure in the stage of bridge construction is carried out, and it is classified. It is pointed out that the sensitivity factors should be accurately simulated in the calculation. It is necessary to strictly control the construction quality from the point of view of construction, to do the risk pre-evaluation and reasonable construction monitoring as far as possible. It is ensured that the results of internal force and line shape of the structure after completion of the bridge meet the design objectives. Therefore, through the calculation and analysis of the bridge, the author understands the design and construction flow and key links of the steel pipe arch. It is also expected to provide some reference for future readers in the study of steel pipe arch.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.4;U448.225

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 肖汝誠,項(xiàng)海帆;斜拉橋索力優(yōu)化的影響矩陣法[J];同濟(jì)大學(xué)學(xué)報(bào)(自然科學(xué)版);1998年03期

2 于琦;孟少平;;系桿拱橋吊桿張拉控制有限元模擬方法研究[J];特種結(jié)構(gòu);2008年01期

，

本文編號：1687693