發(fā)布時(shí)間：2018-04-13 08:15

  本文選題：轉(zhuǎn)體施工 + 大體積混凝土承臺(tái)　； 參考：《武漢理工大學(xué)》2014年碩士論文

【摘要】：隨著我國(guó)橋梁建設(shè)事業(yè)的不斷發(fā)展，大跨徑大噸位的橋梁越來越多的采用轉(zhuǎn)體施工。橋梁轉(zhuǎn)體施工工藝，在建造過程中本著“轉(zhuǎn)得動(dòng)、轉(zhuǎn)得穩(wěn)、轉(zhuǎn)得準(zhǔn)”的原則，對(duì)轉(zhuǎn)動(dòng)體系的施工與監(jiān)控尤為重要。大噸位轉(zhuǎn)體橋梁不僅要求施工精良的轉(zhuǎn)動(dòng)體系，而且要求體積大、強(qiáng)度高、穩(wěn)定性好的混凝土承臺(tái)。本文以京包鐵路分離式立交橋轉(zhuǎn)體施工控制和穩(wěn)定性分析項(xiàng)目為工程背景，選用ANSYS分析軟件對(duì)大噸位T構(gòu)轉(zhuǎn)體橋承臺(tái)進(jìn)行了抗裂性能分析。主要內(nèi)容有： (1)分析了大體積混凝土結(jié)構(gòu)早期開裂的主要原因，是水泥水化放熱致使混凝土結(jié)構(gòu)內(nèi)部產(chǎn)生不均勻拉應(yīng)力引起的。從而通過對(duì)大體積混凝土承臺(tái)澆筑后前十天的養(yǎng)護(hù)環(huán)境模擬，對(duì)大體積混凝土承臺(tái)進(jìn)行了溫度場(chǎng)和溫度應(yīng)力場(chǎng)分析，并通過分析的結(jié)果與實(shí)測(cè)結(jié)果對(duì)比，驗(yàn)證了分析方法的可行性。 (2)對(duì)比了大體積承臺(tái)的兩種主要設(shè)計(jì)方法：控制截面法和空間桁架模型分析法，對(duì)轉(zhuǎn)體橋承臺(tái)施工過程中和轉(zhuǎn)體就位封裝后，承臺(tái)的有效高度發(fā)生變化，根據(jù)承臺(tái)矩厚比，分別對(duì)承臺(tái)進(jìn)行了承載能力分析，并對(duì)承臺(tái)內(nèi)關(guān)鍵受力部位進(jìn)行了精細(xì)化分析。 (3)通過對(duì)京包鐵路分離式立交橋轉(zhuǎn)體施工過程的分析，確定了針對(duì)承臺(tái)的三個(gè)典型工況：稱重試驗(yàn)前，配重后，封裝后，分別對(duì)承臺(tái)進(jìn)行分析計(jì)算，得出了承臺(tái)的傳力模式和破壞機(jī)理。 (4)按照現(xiàn)場(chǎng)隨機(jī)振動(dòng)實(shí)測(cè)數(shù)據(jù)，近似轉(zhuǎn)化成隨機(jī)荷載施加在承臺(tái)上，，分析了承臺(tái)關(guān)鍵受力部位在隨機(jī)荷載作用下的響應(yīng)。驗(yàn)證了轉(zhuǎn)體橋承臺(tái)內(nèi)鋼轉(zhuǎn)盤應(yīng)力并非圓心處最大，而是延半徑方向距圓心2/3R處最大。 (5)參照規(guī)范要求，結(jié)合現(xiàn)場(chǎng)實(shí)測(cè)數(shù)據(jù)，對(duì)大體積承臺(tái)的溫度抗裂措施提出了建議。并通過分析轉(zhuǎn)體橋承臺(tái)在巨大豎向荷載作用下的傳力模型和破壞機(jī)理，提出了轉(zhuǎn)體橋承臺(tái)在荷載作用下的抗裂建議。 研究表明：導(dǎo)致大噸位T型剛構(gòu)轉(zhuǎn)體橋承臺(tái)開裂的因素主要有溫度應(yīng)力引起的開裂，和不平衡荷載以及隨機(jī)荷載作用下的開裂。根據(jù)京包鐵路分離式立交橋轉(zhuǎn)體橋施工過程分析，證明了稱重試驗(yàn)前承臺(tái)內(nèi)的應(yīng)力狀態(tài)為最危險(xiǎn)狀態(tài)。對(duì)包含轉(zhuǎn)動(dòng)體系的大體積承臺(tái)的抗裂性能分析結(jié)果提出溫度裂縫以及荷載裂縫的預(yù)防措施，對(duì)大噸位轉(zhuǎn)體橋施工特別是承臺(tái)的施工提供保障。
[Abstract]:With the continuous development of bridge construction in our country, more and more bridges with long span and large tonnage are constructed with rotary construction.In the process of construction, it is very important for the construction and monitoring of the rotational system to follow the principle of "turning can move, turning steadily and turning accurately".The large tonnage rotary bridge requires not only a well-constructed rotating system, but also a concrete cap with large volume, high strength and good stability.In this paper, based on the construction control and stability analysis project of separated interchange bridge of Beijing-Baotong railway, the anti-crack performance of large-tonnage T-structure rotary bridge cap is analyzed by using ANSYS analysis software.The main contents are:1) the main causes of early cracking of mass concrete structures are analyzed, which are caused by uneven tensile stress in concrete structures caused by hydration and heat release of cement.The temperature field and temperature stress field of mass concrete cap are analyzed by simulating the maintenance environment ten days before pouring, and the results are compared with the measured results.The feasibility of the analytical method is verified.This paper compares two main design methods of mass cap: control section method and spatial truss model analysis method. The effective height of the cap changes during the construction process of the cap of the rotary bridge and after the turning-in package, according to the ratio of the cap moment to the thickness,The bearing capacity of the cap is analyzed, and the key parts of the cap are analyzed in detail.Through the analysis of the construction process of the separated interchange bridge of Jingbao railway, three typical working conditions are determined: before weighing test, after weighing, and after encapsulation, the pile cap is analyzed and calculated separately.The transmission mode and failure mechanism of cap are obtained.4) according to the measured data of random vibration in the field, the response of the key part of the cap subjected to random load is analyzed.It is verified that the stress of the steel turntable in the cap of the rotary bridge is not the largest at the center of the circle, but the maximum at the direction of the extension radius being 2 / 3R from the center of the circle.5) according to the requirements of the specification and the field measured data, some suggestions are put forward for the temperature crack resistance measures of the mass cap.Based on the analysis of the load transfer model and failure mechanism of the turning-bridge cap under the huge vertical load, the paper puts forward the anti-crack suggestion of the turning-bridge cap under the load.The results show that the main factors leading to the cap cracking of the large-tonnage T-type rigid frame rotary bridge are the cracking caused by temperature stress, the unbalance load and the cracking under random load.According to the analysis of the construction process of the rotary bridge of the separated interchange bridge of the Beijing-Bao-Baotong Railway, it is proved that the stress state in the cap before weighing test is the most dangerous state.Based on the analysis of crack resistance of large cap with rotating system, the preventive measures of temperature crack and load crack are put forward, which can provide guarantee for the construction of large tonnage rotary bridge, especially for the construction of pile cap.
【學(xué)位授予單位】：武漢理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U443.25

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