【摘要】：連續(xù)剛構(gòu)橋自問(wèn)世以來(lái)，憑借其良好的受力性能、抗震能力、行車(chē)舒適度、施工方便、造型簡(jiǎn)潔美觀(guān)等優(yōu)點(diǎn)，被廣泛應(yīng)用于城市、高等級(jí)公路等橋梁。目前，隨著國(guó)家西部大開(kāi)發(fā)戰(zhàn)略的深入，西部地區(qū)的交通事業(yè)發(fā)展迅速。由于部分地區(qū)受到環(huán)境限制，連續(xù)剛構(gòu)橋在跨徑或墩高的設(shè)置上采取了不對(duì)稱(chēng)布置。但是大多數(shù)不對(duì)稱(chēng)連續(xù)剛構(gòu)橋的設(shè)計(jì)、施工仍然是參照對(duì)稱(chēng)連續(xù)剛構(gòu)橋，而事實(shí)上，，橋梁的不對(duì)稱(chēng)性對(duì)結(jié)構(gòu)還是有影響的，比如：主梁中、邊跨比不理想，對(duì)橋梁的施工方案的確定、結(jié)構(gòu)內(nèi)力和變形控制等造成一定的難度；由于結(jié)構(gòu)不對(duì)稱(chēng)，收縮徐變、溫度變化等因素所引起的主梁內(nèi)力、變形以及橋墩受力都會(huì)與對(duì)稱(chēng)結(jié)構(gòu)有一定差異，并且結(jié)構(gòu)不對(duì)稱(chēng)程度越大，這種差異就體現(xiàn)的越明顯。 本論文的依托工程——白布河大橋?yàn)榭鐝胶投崭呔粚?duì)稱(chēng)的連續(xù)剛構(gòu)橋，在文中使用有限元軟件Midas/Civil對(duì)橋梁進(jìn)行了以下研究： （1）建立白布河大橋施工階段模型，對(duì)大橋在施工階段的最大拉、壓應(yīng)力作出分析；分別建立成橋及成橋后3年、10年的有限元模型，并研究其在成橋階段結(jié)構(gòu)的位移、應(yīng)力，以及混凝土收縮徐變對(duì)結(jié)構(gòu)位移、應(yīng)力的影響。 （2）以白布河大橋的原始模型為基礎(chǔ)，分別建立1、2號(hào)墩高之比從0.17~1.00的16個(gè)有限元模型，分析各個(gè)模型中結(jié)構(gòu)在成橋恒載、系統(tǒng)升（降溫）、混凝土收縮徐變作用下的內(nèi)力、位移，研究墩高的不對(duì)稱(chēng)性對(duì)于白布河大橋結(jié)構(gòu)內(nèi)力、位移的影響。 （3）對(duì)白布河大橋做動(dòng)力有限元分析，使用反應(yīng)譜法對(duì)白布河大橋做地震響應(yīng)分析，研究白布河大橋結(jié)構(gòu)的不對(duì)稱(chēng)性對(duì)其動(dòng)力特性及地震響應(yīng)的影響。
[Abstract]:Continuous rigid frame bridge has been widely used in cities, high grade highways and other bridges because of its good mechanical performance, seismic resistance, driving comfort, convenient construction, simple and beautiful shape, etc. At present, with the development of the western region, the transportation industry in the western region is developing rapidly. Due to the environmental constraints in some areas, the continuous rigid frame bridges are arranged asymmetrically in the setting of span or pier height. However, the design and construction of most asymmetric continuous rigid frame bridges are still referred to the symmetrical continuous rigid frame bridges, but in fact, the asymmetry of the bridges still has an effect on the structure. For example, in the main girder, the ratio of side to span is not ideal. It is difficult to determine the construction scheme of the bridge, control the internal force and deformation of the structure. Due to the structural asymmetry, shrinkage and creep, temperature change and other factors caused by the main beam internal force, deformation and pier force will be different from the symmetrical structure, and the greater the degree of structural asymmetry, the more obvious this difference is. The supporting project of this thesis, Baibuhe Bridge, is a continuous rigid frame bridge with asymmetric span and pier height. In this paper, the bridge is studied by finite element software Midas/Civil: (1) the model of the construction stage of Baibuhe River Bridge is established. The maximum tensile and compressive stress of the bridge in the construction stage is analyzed. The finite element models of the bridge were established for 3 years and 10 years after the completion of the bridge, and the effects of the displacement, stress, shrinkage and creep of concrete on the displacement and stress of the structure were studied. (2) based on the original model of Baibuhe Bridge, 16 finite element models with the ratio of height of pier 1 and 2 from 0.17 to 1.00 are established respectively. The influence of the asymmetry of pier height on the internal force and displacement of Baibuhe Bridge is studied. (3) dynamic finite element analysis of Baibuhe River Bridge and seismic response analysis of Baibuhe Bridge using response spectrum method are carried out, and the influence of structural asymmetry of Baibuhe Bridge on its dynamic characteristics and seismic response is studied.
【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(lèi)號(hào)】：U441

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