本文關(guān)鍵詞： 鋼筋混凝土拱橋 合理設(shè)計狀態(tài) 勁性骨架組合施工法 應(yīng)力控制　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】：近30多年來，我國建造了數(shù)量眾多的大跨徑混凝土拱橋，主拱圈施工方法主要是支架現(xiàn)澆法、纜索吊裝法、勁性骨架法和轉(zhuǎn)體施工法，這些施工方法在經(jīng)濟(jì)性和耐久性上尚存在不足�？v觀國外大跨度混凝土拱橋建設(shè)，采用懸臂澆筑與勁性骨架相組合的施工方法，具有整體性好、節(jié)約鋼材和對扣掛系統(tǒng)要求較低的優(yōu)勢。進(jìn)入本世紀(jì)，國內(nèi)采用懸臂澆筑法施工了3座鋼筋混凝土拱橋，但對懸臂澆筑與勁性骨架組合施工法尚未進(jìn)行過研究，因此缺乏對該工法施工的大跨徑混凝土拱橋力學(xué)行為、扣索力和外包混凝土澆筑過程的了解。本文依托貴州省交通運(yùn)輸廳科技項(xiàng)目（2011-122-034）“懸澆鋼筋混凝土箱型拱橋設(shè)計與施工技術(shù)研究”子課題“拱圈部分懸澆和部分勁性骨架混凝土拱圈構(gòu)造與受力研究”，開展如下研究工作： ①針對300m跨試設(shè)計拱橋懸臂澆筑施工過程，結(jié)合拱圈混凝土抗彎性能低的特點(diǎn)，開展了“帶有預(yù)測機(jī)制的應(yīng)力控制前進(jìn)分析”的算法研究，，以懸澆過程的拱圈混凝土上、下緣應(yīng)力為控制目標(biāo)，根據(jù)當(dāng)前已成型節(jié)段扣索力，得到即將張拉扣索的索力可行域，利用該可行域可自動判斷出扣索張拉方式（拆除已張拉扣索，整節(jié)段一次澆筑、一次張拉，分級澆筑、分次張拉）及張拉力。此外，提出了基于ANSYS的懸臂澆筑施工過程的模擬方法。 ②結(jié)合勁性骨架吊裝過程受力特點(diǎn)，提出吊裝過程扣索力計算方法，確保封鉸桿件及合龍段都能以預(yù)制線形安裝。同時根據(jù)無應(yīng)力狀態(tài)原理，提出了“大階段”模擬中扣索索力在加密計算中的換算方法。 ③外包混凝土澆筑與懸澆節(jié)段相互影響研究。通過提取拱圈截面應(yīng)力影響線，分析了外包混凝土澆筑對懸澆節(jié)段應(yīng)力的影響，提出通過拆除懸澆節(jié)段扣索調(diào)整勁性骨架段線形的控制方法。 本文針對懸澆與勁性骨架組合施工法提出的一整套施工階段合理設(shè)計狀態(tài)計算方法，對該工法的實(shí)踐與推廣具有指導(dǎo)意義。
[Abstract]:In the past 30 years, a large number of long-span concrete arch bridges have been built in China. The main arch ring construction methods are cast-in-situ support, cable hoisting, rigid skeleton and rotary construction. These construction methods are still insufficient in economy and durability. Overlooking the construction of long-span concrete arch bridge in foreign countries, the construction method of cantilever pouring combined with rigid skeleton has good integrity. In this century, three reinforced concrete arch bridges have been constructed by cantilever pouring method, but the combination construction method of cantilever pouring and rigid skeleton has not been studied. Therefore, the mechanical behavior of long-span concrete arch bridge constructed by this method is lacking. Understanding of the Construction process of Cable and Outsourcing concrete. This paper relies on the Science and Technology Project 2011-122-034 of Guizhou Provincial Traffic and Transportation Department). Study on Design and Construction Technology of cantilever reinforced concrete Box Arch Bridge "Subtopic" Research on the structure and Force of Arch Ring partially suspended cast and partially stiffened concrete Arch Ring ". The following studies have been carried out: 1. In view of the construction process of cantilever construction of 300m span trial design arch bridge, combined with the characteristics of low flexural performance of arch ring concrete, the algorithm of "stress control forward analysis with prediction mechanism" is studied. With the stress of the lower edge of the arch ring concrete in the process of suspended pouring as the control target, the feasible range of cable force is obtained according to the currently formed segment buckling force. By using this feasible region, we can automatically judge the tension mode of the buckle cable (removing the tensioned cable, pouring the whole segment once, one stretch, grading pouring, dividing the tension) and tensioning force. The simulation method of cantilever pouring process based on ANSYS is presented. 2 combined with the mechanical characteristics of the rigid skeleton hoisting process, the calculation method of buckle force in hoisting process is put forward to ensure that the hinged members and the closure section can be installed in the form of prefabricated lines, and at the same time, according to the principle of non-stress state. The conversion method of cable buckling force in encryption calculation in "large stage" simulation is put forward. 3Research on the interaction between the outlay concrete pouring and the cantilever section. By extracting the stress influence line of the arch ring section, the influence of the outsourced concrete pouring on the cantilever section stress is analyzed. This paper presents a control method for adjusting the linear shape of the rigid skeleton segment by removing the suspensions. In this paper, a set of reasonable design state calculation method for construction stage is put forward, which is of guiding significance to the practice and popularization of the construction method.
【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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