【摘要】：連續(xù)剛構(gòu)橋施工具有節(jié)段較多和干擾因素復(fù)雜的特點(diǎn),而且成橋之后很難進(jìn)行調(diào)整,因此需要在施工過(guò)程中進(jìn)行合理的施工控制,使得成橋運(yùn)營(yíng)后的結(jié)構(gòu)狀態(tài)滿足設(shè)計(jì)要求。連續(xù)剛構(gòu)橋的施工控制主要包括結(jié)構(gòu)線形和應(yīng)力控制,通過(guò)施工過(guò)程中對(duì)結(jié)構(gòu)線形和應(yīng)力的調(diào)整來(lái)達(dá)到對(duì)整體結(jié)構(gòu)的有效控制。本文以鮑家洲漢江特大橋主橋?yàn)檠芯勘尘?結(jié)合橋梁設(shè)計(jì)資料與研究現(xiàn)狀進(jìn)行了連續(xù)剛構(gòu)橋施工控制分析。建立主橋有限元分析模型,對(duì)各類設(shè)計(jì)參數(shù)進(jìn)行敏感性分析得到:對(duì)主梁撓度影響較大的參數(shù)分別是混凝土容重、混凝土收縮徐變、預(yù)應(yīng)力、溫度梯度以及年溫差,在參數(shù)變化范圍內(nèi)引起的撓度變化大于2mm;對(duì)主梁應(yīng)力影響較大的參數(shù)分別是混凝土容重、混凝土收縮徐變、預(yù)應(yīng)力以及溫度梯度,在參數(shù)變化范圍內(nèi)引起的應(yīng)力變化大于1 MPa。在此基礎(chǔ)之上,提出了施工過(guò)程中針對(duì)各類敏感設(shè)計(jì)參數(shù)的控制措施,為主橋線形和應(yīng)力監(jiān)控提供理論依據(jù)。建立三角掛籃有限元分析模型,對(duì)主橋中使用的三角掛籃分別進(jìn)行了結(jié)構(gòu)強(qiáng)度驗(yàn)算、結(jié)構(gòu)剛度驗(yàn)算、結(jié)構(gòu)抗傾覆驗(yàn)算以及局部構(gòu)件驗(yàn)算,驗(yàn)算結(jié)果表明該三角掛籃符合規(guī)范要求和施工需求。除此之外還進(jìn)行了掛籃變形分析,在有限元建模計(jì)算、主桁架預(yù)壓試驗(yàn)以及掛籃變形實(shí)測(cè)的基礎(chǔ)上進(jìn)行了掛籃理論變形值、試驗(yàn)變形值與實(shí)測(cè)變形值的比較分析,結(jié)果表明三者差值滿足施工要求,證明了掛籃變形預(yù)測(cè)的合理性。依據(jù)主橋有限元分析模型,進(jìn)行了主橋施工階段分析計(jì)算和移動(dòng)荷載分析計(jì)算,從應(yīng)力和變形的角度驗(yàn)證了原橋梁設(shè)計(jì)的合理性,明確了主橋在移動(dòng)荷載作用下的應(yīng)力和變形狀態(tài)。結(jié)合本橋特點(diǎn)提出預(yù)拱度的表達(dá)式,依據(jù)主橋計(jì)算模型分析得到各施工節(jié)段的預(yù)拱度值,以供立模標(biāo)高之用。進(jìn)行了主橋高程與應(yīng)力監(jiān)控?cái)?shù)據(jù)分析,表明施工過(guò)程中結(jié)構(gòu)線形和應(yīng)力狀態(tài)均能滿足規(guī)范要求,進(jìn)而證明該橋施工控制的合理性。
[Abstract]:The continuous rigid frame bridge construction has the characteristics of more segments and complex interference factors, and it is difficult to adjust after the bridge is completed. Therefore, it is necessary to carry out reasonable construction control in the construction process to make the structure state after the completion of the bridge meet the design requirements. The construction control of continuous rigid frame bridge mainly includes structural alignment and stress control. Through the adjustment of structural alignment and stress in the construction process, the overall structure can be effectively controlled. Taking the main bridge of Baojiazhou Hanjiang River Bridge as the research background, the construction control analysis of continuous rigid frame bridge is carried out in combination with the bridge design data and the present research situation. The finite element analysis model of the main bridge is established and the sensitivity analysis of various design parameters is carried out. The results show that the parameters which have great influence on the deflection of the main beam are concrete bulk density, concrete shrinkage and creep, prestress, temperature gradient and annual temperature difference, respectively. The deflection change caused by the variation of parameters is more than 2 mm; The parameters which have great influence on the stress of the main beam are concrete bulk density, concrete shrinkage and creep, prestress and temperature gradient. The variation of stress in the range of parameters is greater than 1 MPa.. On the basis of this, the control measures for all kinds of sensitive design parameters in the construction process are put forward, which provide the theoretical basis for the line shape and stress monitoring of the main bridge. The finite element analysis model of trigonometric hanging basket is established. The structural strength checking calculation, structural stiffness checking calculation, structural anti-overturning checking calculation and local component checking calculation are carried out respectively for the triangular hanging basket used in the main bridge. The checking result shows that the triangle hanging basket accords with the requirement of specification and construction. In addition, the deformation analysis of the hanging basket is carried out. On the basis of the finite element modeling calculation, the pre-loading test of the main truss and the measurement of the deformation of the hanging basket, the theoretical deformation value of the hanging basket, the comparison between the experimental deformation value and the measured deformation value are compared and analyzed. The results show that the difference among them meets the requirements of construction and proves the rationality of deformation prediction of hanging basket. According to the finite element analysis model of the main bridge, the analysis and calculation of the construction stage and the moving load of the main bridge are carried out. The rationality of the original bridge design is verified from the point of view of stress and deformation. The stress and deformation state of the main bridge under moving load is defined. According to the characteristics of the bridge, the expression of the pre-arch degree is put forward, and the pre-arch value of each construction segment is obtained according to the calculation model of the main bridge, which can be used for the elevation of the vertical formwork. Through the analysis of the height and stress monitoring data of the main bridge, it is shown that the structural alignment and stress state can meet the requirements of the code during the construction process, and the rationality of the construction control of the bridge is further proved.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U445.4

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