本文選題：鋼管混凝土勁性骨架 + 多工作面澆注��； 參考：《廣西大學(xué)》2016年碩士論文

【摘要】：隨著大跨度拱橋發(fā)展與需求,鋼管混凝土勁性骨架拱橋的應(yīng)用越來越廣泛,其勁性骨架拱圈施工控制關(guān)鍵在于外包混凝土的澆注。外包混凝土采用多工作面澆注方法施工,其勁性骨架受力對稱均勻,勁性骨架應(yīng)力分配均勻,變形較小,有較好的調(diào)載效果,而分環(huán)多工作面澆注調(diào)載效果主要由工作面劃分與縱向分段共同決定。為此本文對某鋼管混凝土勁性骨架拱橋主橋拱圈外包混凝土多工作面澆注過程其結(jié)構(gòu)受力與變形進(jìn)行計算分析。主要研究內(nèi)容與結(jié)論有：通過分析無調(diào)載分環(huán)連續(xù)澆注外包混凝土過程結(jié)構(gòu)受力情況,結(jié)合影響線理論分析其變形與應(yīng)力變化規(guī)律與最不利狀態(tài),為多工作面澆注方法設(shè)計提供依據(jù)。分析4工作面、6工作面澆注和8工作面澆注對主拱圈線形與應(yīng)力的調(diào)載效果,逐步對工作面劃分進(jìn)行優(yōu)化,得到結(jié)論：根據(jù)影響線合理分配影響線正、負(fù)應(yīng)力區(qū)域的工作面數(shù)量,使正負(fù)應(yīng)力能有效相互平衡,才能達(dá)到最佳的調(diào)載效果；本文研究對象外包混凝土澆注最優(yōu)工作面劃分為6工作面。以控制變量方法比較7個不同的多工作面澆注模型結(jié)構(gòu)受力情況,總結(jié)縱向分段與工作面劃分之間相互關(guān)系及其對施工控制效果影響,得到結(jié)論：在變形控制方面,4工作面澆注有一定的優(yōu)化效果,但不能滿足線形控制要求；6工作面、8工作面及10工作面澆注均對主拱圈線形起到很好的控制效果,在拱頂最終撓度控制上,細(xì)分縱向段即縱向總段數(shù)越多其最終撓度越小。在應(yīng)力控制方面,在相同的工作面劃分下,細(xì)分縱向分段可優(yōu)化調(diào)載效果。結(jié)合工作面劃分與縱向分段的分析研究得,在設(shè)計多工作面澆注方案時,應(yīng)先結(jié)合影響線理論合理地劃分工作面,再綜合考施工控制、施工工期和經(jīng)濟(jì)等方面要求合理劃分縱向段。結(jié)合計算結(jié)果與比較分析,本文推薦研究對象采用6工作面18段澆注外包混凝土。
[Abstract]:With the development and demand of long-span arch bridge, the application of concrete-filled steel tube rigid frame arch bridge is more and more extensive. The key of construction control of rigid frame arch ring is the pouring of concrete. In the construction of outsourced concrete with multi-face pouring method, the stiffness skeleton is symmetrical and uniform, the stress distribution of the stiffness skeleton is uniform, the deformation is small, and the load regulation effect is better. The effect of pouring load regulation is mainly determined by working face division and longitudinal section. In this paper, the stress and deformation of concrete filled steel tube structure are calculated and analyzed during the pouring process of the arch ring of a steel tube reinforced concrete arch bridge. The main research contents and conclusions are as follows: by analyzing the stress situation of the concrete structure during continuous pouring with unadjusted load and ring, combined with the theory of influence line, the deformation and stress variation law and the most disadvantageous state of the concrete are analyzed. It provides the basis for the design of multi-face pouring method. This paper analyzes the effect of pouring on main arch ring alignment and stress in No. 4 working face No. 6 and working face No. 8, and gradually optimizes the division of working face. The conclusion is: according to the reasonable distribution of influence line, the influence line is positive. The number of working faces in the negative stress area can balance the positive and negative stresses effectively to achieve the best load regulation effect. The best working face of outsourced concrete pouring is divided into 6 working faces in this paper. By using the method of control variable, the stress of 7 different multi-face pouring models is compared, and the relationship between longitudinal segment and working face partition and its influence on construction control effect are summarized. The conclusion is that the pouring of No. 4 working face has certain optimum effect in deformation control, but it can not meet the requirements of linear control, but the pouring in No.6 and 10 working faces has a good control effect on the main arch ring shape. In the final deflection control of the vault, the more the total longitudinal segment is, the smaller the final deflection is. In the aspect of stress control, the effect of load regulation can be optimized by subdividing longitudinal segment under the same working face division. Combined with the analysis of working face division and longitudinal section, it is concluded that in designing the pouring scheme of multi-face, the working face should be rationally divided with the theory of influence line, and then the construction control should be comprehensively tested. The construction period and economy require reasonable division of the longitudinal section. Combined with the results of calculation and comparative analysis, this paper recommends that the research object should be cast out concrete in 18 sections of 6 working face.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U445.57;U448.22

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 孫潮;劉明;陳寶春;吳慶雄;;下套拱加固石拱橋復(fù)合拱圈極限承載力研究[J];福州大學(xué)學(xué)報(自然科學(xué)版);2012年03期

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本文編號：1905786