【摘要】：雖然支座在橋梁建設(shè)的造價(jià)中所占比例很小,但是其重要性不言而喻。支座分為固定支座、單向活動支座及雙向活動,支座重慶涪陵烏江大橋支座由過渡墩支座、輔助墩支座及主墩支座組成。支座反力大小由恒載、活載以及溫度等其它附加因素決定。斜拉橋合理成橋狀態(tài)有一組最優(yōu)索力使主梁、主塔受力最佳,與之相對應(yīng)的成橋狀態(tài)支座反力共同平衡主梁重量,同時考慮支座反力影響線在最不利汽車活載作用下求出的反力最大值,加上溫度、墩身沉降等因素最不利條件下的支座反力變化值,按照效應(yīng)的標(biāo)準(zhǔn)值組合確定支座反力的設(shè)計(jì)值,并兼顧支座縱向位移值、橫向位移值,從而進(jìn)行支座的設(shè)計(jì)。本文對支座的受力以及輔助墩對斜拉橋受力性能的影響進(jìn)行分析,以重慶涪陵烏江大橋?yàn)檠芯勘尘?主要工作內(nèi)容如下：1)本文用分步算法確定重慶涪陵烏江大橋的合理成橋狀態(tài),研究合理成橋狀態(tài)下以及活載作用下的支座受力,綜合溫度、支座沉降等附加因素造成的支座反力變化,按照效應(yīng)的標(biāo)準(zhǔn)值組合確定支座反力的設(shè)計(jì)值,為以后支座的選用提供參考。2)闡述混凝土的溫度效應(yīng)理論,利用有限元分析軟件Midas\Civil計(jì)算了溫度效應(yīng)(體系溫差、索梁溫差、索塔溫差、溫度梯度、支座安裝溫度以及合龍溫度)對重慶涪豐石高速烏江大橋支座受力及縱橋向位移的影響,分析了影響烏江大橋拉壓支座受力的最不利溫度荷載組合,并對影響輔助墩、過渡墩支座受力大小的溫度荷載進(jìn)行排序,針對支座安裝以及合龍溫度提出了相關(guān)建議；3)分析混凝土容重、索力誤差、活載、二期恒載、墩身沉降等因素對烏江大橋拉壓支座的受力影響,并對過渡墩、輔助墩上壓重橫梁進(jìn)行優(yōu)化設(shè)計(jì),確保支座處于合理的受力狀態(tài),針對支座受力及支座處主梁縱向位移尋找出其中規(guī)律并提出相關(guān)建議；4)探討輔助墩對斜拉橋主梁應(yīng)力、主梁豎向變形、索塔彎矩和拉索應(yīng)力的影響,對輔助墩合理數(shù)量進(jìn)行研究,通過比較不同的方案分析輔助墩的最優(yōu)位置,得出相關(guān)結(jié)論,為今后斜拉橋輔助墩的設(shè)計(jì)、分析提供參考。
[Abstract]:Although the support in the cost of bridge construction accounts for a small proportion, but its importance is self-evident. The support is divided into fixed support, one-way active support and bidirectional support. The support of Fuling Wujiang Bridge in Chongqing consists of transitional pier support, auxiliary pier support and main pier support. The support reaction force is determined by other additional factors such as dead load, live load and temperature. There is a group of optimal cable forces to make the main girder and the main tower bear the best force in the reasonable state of the cable-stayed bridge. The corresponding state of the bridge supports counterforce balance the weight of the main beam together. At the same time, considering the maximum value of the reaction force under the most disadvantageous vehicle live load, the change value of the bearing reaction force under the most unfavorable conditions, such as temperature, pier settlement and so on, is taken into account. According to the standard value combination of the effect, the design value of the support reaction force is determined, and the support longitudinal displacement value and the transverse displacement value are taken into account in order to carry out the design of the support. This paper analyzes the bearing force and the influence of auxiliary piers on the mechanical performance of cable-stayed bridge, taking the Fuling Wujiang Bridge in Chongqing as the research background. The main work of this paper is as follows: (1) in this paper, we use the stepwise algorithm to determine the reasonable completion state of the Fuling Wujiang Bridge in Chongqing, and study the bearing force and the comprehensive temperature under the reasonable completion state and the live load. According to the standard value combination of the effect, the design value of the bearing reaction force is determined, which can provide reference for the later selection of the bearing. (2) the theory of temperature effect of concrete is expounded. The influence of temperature effect (system temperature difference, cable beam temperature difference, cable tower temperature difference, temperature gradient, support installation temperature and closure temperature) on the bearing force and longitudinal displacement of Wujiang Bridge at Fufeng High Speed in Chongqing is calculated by using the finite element analysis software Midas\ Civil. This paper analyzes the most unfavorable temperature load combination which affects the bearing force of the tension and compression bearing of Wujiang Bridge, and sorts the temperature load that affects the bearing size of the auxiliary pier and the transition pier, and puts forward some relevant suggestions for the installation of the bearing and the closing temperature. 3) analyzing the influence of concrete bulk density, cable force error, live load, second stage dead load, pier settlement and other factors on the tension and compression bearing of Wujiang Bridge, and optimizing the design of the transition pier and the compression beam on the auxiliary pier. To ensure that the bearing is in a reasonable state of stress, to find out the law of the bearing force and the longitudinal displacement of the main beam at the support, and to put forward some relevant suggestions (4) to probe into the stress and vertical deformation of the main beam of the auxiliary pier to the cable-stayed bridge, The influence of cable tower bending moment and cable stress on the reasonable number of auxiliary piers is studied. The optimum position of auxiliary piers is analyzed by comparing different schemes and relevant conclusions are drawn which can provide a reference for the design and analysis of auxiliary piers of cable-stayed bridges in the future.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U448.27
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本文編號：2215642