本文關(guān)鍵詞： 懸臂澆筑 勁性骨架 外包混凝土澆筑 非線性穩(wěn)定　出處：《重慶交通大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：國內(nèi)建造大跨徑鋼筋混凝土拱橋通常采用纜索吊裝法,為滿足吊裝承載力要求,需要將拱圈人為分段以減輕吊重,這樣顯著降低了拱圈的整體性,容易在后期運(yùn)營期間產(chǎn)生裂縫。國外往往采用懸臂澆筑法,而對于更大跨徑的拱橋,為減小扣塔及扣錨索用鋼量和懸臂澆筑拱圈的施工風(fēng)險,又發(fā)展使用懸臂澆筑法和勁性骨架組合法,后文簡稱為組合法。為豐富我國混凝土拱橋施工方法,促進(jìn)混凝土拱橋事業(yè)的發(fā)展,有必要研究和借鑒國外組合施工法。研究的內(nèi)容包含廣泛,而穩(wěn)定性是整個施工過程安全性的基本保證,本文以此為出發(fā)點(diǎn),研究組合法施工階段的穩(wěn)定性,給出了考慮幾何材料雙重非線性的計算結(jié)果,并對比了不同施工方案的穩(wěn)定性計算結(jié)果,最后進(jìn)行施工階段穩(wěn)定性影響參數(shù)分析。具體開展了工作如下： ①針對采用懸臂澆筑與勁性骨架施工的鋼筋混凝土拱橋建立板梁聯(lián)合模型。 分析研究各施工方案的穩(wěn)定系數(shù)變化規(guī)律,以此對施工過程提出建議。 ②研究了考慮幾何和材料的雙重非線性對穩(wěn)定安全系數(shù)影響程度。 ③對比分段懸拼與整體提升兩種施工勁性骨架方案的穩(wěn)定性。 ④擬定了四種外包混凝土澆筑方案,分別計算了穩(wěn)定安全系數(shù),并進(jìn)行了對比評價。 ⑤進(jìn)一步對拱圈混凝土強(qiáng)度等級,主弦桿,平聯(lián)的剛度進(jìn)行穩(wěn)定參數(shù)分析,以確定各設(shè)計參數(shù)對施工階段穩(wěn)定的影響大小。
[Abstract]:In order to meet the requirements of hoisting capacity, the arch rings need to be divided artificially to reduce the lifting load, which can significantly reduce the integrity of the arch rings, in order to meet the requirements of hoisting capacity, the cable hoisting method is usually used in the construction of long span reinforced concrete arch bridges in China. It is easy to produce cracks during the later period of operation. In foreign countries, cantilever pouring method is often used, and for larger span arch bridges, in order to reduce the construction risk of steel and cantilever pouring arch ring for buckling tower and anchor cable, In order to enrich the construction methods of concrete arch bridges in China and promote the development of concrete arch bridges, the cantilever pouring method and the rigid skeleton combination method are also used. It is necessary to study and learn from foreign combined construction methods. The contents of the study are extensive, and the stability is the basic guarantee of the safety of the whole construction process. The calculation results considering the double nonlinearity of geometric materials are given, and the stability calculation results of different construction schemes are compared. Finally, the influence parameters of stability in construction stage are analyzed. The detailed work is as follows:. The main results are as follows: 1. The slab-beam joint model is established for reinforced concrete arch bridge with cantilever pouring and rigid skeleton construction. This paper analyzes and studies the variation law of the stability coefficient of each construction scheme, and puts forward some suggestions for the construction process. (2) the influence of the double nonlinearity of geometry and material on the stability safety factor is studied. 3 comparing the stability of two kinds of construction stiffness skeleton schemes: segmental suspension and integral lifting. 4. Four kinds of outsourced concrete pouring schemes were worked out, and the stability safety factors were calculated, and compared and evaluated. (5) the stability parameters of arch ring concrete strength grade, main chord and flat joint stiffness are analyzed to determine the influence of each design parameter on the stability of construction stage.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.22

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