本文選題：斜拉—懸吊組合體系橋　切入點(diǎn)：動(dòng)力特性　出處：《浙江工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：斜拉—懸吊組合體系橋是一種具有較強(qiáng)跨越能力的新型橋梁結(jié)構(gòu)形式,它結(jié)合了斜拉橋和懸索橋的優(yōu)點(diǎn)并在一定程度上克服了兩者的缺點(diǎn),具有廣泛的應(yīng)用前景。目前,國內(nèi)外對這種橋型的動(dòng)力性能研究還比較少。本文針對1400米主跨斜拉—懸吊組合體系方案橋,在總結(jié)國內(nèi)外文獻(xiàn)的基礎(chǔ)上,從設(shè)計(jì)參數(shù)的角度出發(fā),對斜拉—懸吊組合體系橋的動(dòng)力特性和抗震性能進(jìn)行了分析研究,同時(shí)與相同主跨的斜拉橋和懸索橋進(jìn)行了分析和比較。研究成果對斜拉—懸吊組合體系橋抗震性設(shè)計(jì)具有較好的參考意義和應(yīng)用價(jià)值。 本文首先利用有限元分析軟件MIDAS/Civil建立了1400米主跨斜拉—懸吊組合體系方案橋的三維有限元模型,并進(jìn)行了結(jié)構(gòu)動(dòng)力特性分析,同時(shí)與相同主跨的斜拉橋和懸索橋結(jié)構(gòu)體系的動(dòng)力特性進(jìn)行了對比分析。在此基礎(chǔ)上,分析了不同結(jié)構(gòu)參數(shù)諸如主纜矢跨比、吊跨比、邊跨長度、輔助墩設(shè)置、主梁約束方式和主梁結(jié)構(gòu)形式對斜拉—懸吊組合體系橋動(dòng)力特性的影響。 其次,分別采用反應(yīng)譜法和時(shí)程分析法對斜拉—懸吊組合體系橋進(jìn)行了抗震性能分析,討論了兩種分析方法下結(jié)構(gòu)反應(yīng)結(jié)果的差異,并與相同主跨的斜拉橋和懸索橋結(jié)構(gòu)體系的抗震性能進(jìn)行了對比分析。在此基礎(chǔ)上,改變主纜矢跨比、吊跨比、邊跨長度、輔助墩設(shè)置、主梁約束方式和主梁結(jié)構(gòu)形式等結(jié)構(gòu)主要設(shè)計(jì)參數(shù),對其地震反應(yīng)進(jìn)行分析和比較,對設(shè)計(jì)參數(shù)的取值提出參考意見。 通過分析和研究表明：(1)斜拉—懸吊組合體系橋振型頻率較小,基本周期長,為柔性結(jié)構(gòu),振型分布密集,有振型耦合的情況;(2)組合體系橋動(dòng)力特性介于斜拉橋和懸索之間,更為接近懸索橋,總體表現(xiàn)要優(yōu)于同跨徑斜拉橋與懸索橋；(3)與反應(yīng)譜法相比,時(shí)程分析法可以考慮一些非線性因素的影響,能更準(zhǔn)確地預(yù)測結(jié)構(gòu)的抗震性能；(4)主纜矢跨比為1/10、吊跨比在0.4-0.5之間、采用短邊跨并設(shè)置輔助墩、半漂浮體系、主梁采用混合梁形式的斜拉—懸吊組合體系橋具有較好的動(dòng)力特性和抗震性能。
[Abstract]:The cable-stayed suspension composite system bridge is a new type of bridge structure with strong span ability. It combines the advantages of cable-stayed bridge and suspension bridge, and to some extent overcomes the shortcomings of both, and has a wide application prospect. There is little research on the dynamic performance of this type of bridge at home and abroad. In this paper, based on the summary of domestic and foreign literature, aiming at the 1400m main span cable-stayed suspension composite system bridge, from the point of view of design parameters, The dynamic characteristics and seismic behavior of cable-stayed suspension composite system bridge are analyzed and studied. At the same time, it is analyzed and compared with the cable-stayed bridge and suspension bridge with the same main span. The research results have good reference significance and application value for the seismic design of cable-stayed suspension composite system bridge. In this paper, the three-dimensional finite element model of 1400m main span cable-stayed suspension composite system bridge is established by using the finite element analysis software MIDAS/Civil, and the dynamic characteristics of the structure are analyzed. At the same time, the dynamic characteristics of cable-stayed bridge and suspension bridge with the same main span are compared and analyzed. On this basis, different structural parameters such as main cable rise-span ratio, hoisting span ratio, side span length, auxiliary pier setting are analyzed. The influence of the restraint mode and the structure form of the main beam on the dynamic characteristics of the cable-stayed suspension composite system bridge. Secondly, the seismic behavior of cable-stayed suspension composite system bridge is analyzed by using response spectrum method and time-history analysis method, and the difference of structural response results under the two analysis methods is discussed. The aseismic performance of cable-stayed bridge and suspension bridge with the same main span is compared and analyzed. On this basis, the main cable rise-span ratio, hoisting span ratio, side span length, auxiliary pier setting are changed. The main design parameters, such as the restraint mode of the main beam and the structural form of the main beam, are analyzed and compared, and the reference for the value of the design parameters is put forward. The analysis and research show that the vibration mode frequency of the cable-stayed suspension composite system bridge is small, the basic period is long, it is a flexible structure, the mode distribution is dense, and the dynamic characteristics of the composite system bridge are between the cable-stayed bridge and the suspension cable. Compared with the response spectrum method, the time history analysis method can take into account the influence of some nonlinear factors. The ratio of main cable to span is 1 / 10, the ratio of lifting to span is between 0.4-0.5, the short side span is adopted and auxiliary pier is set up, and the semi-floating system is used to predict the seismic performance of the structure more accurately. The cable-stayed suspension composite system bridge with hybrid beam has better dynamic and seismic performance.
【學(xué)位授予單位】：浙江工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441.3

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本文編號(hào)：1636935