【摘要】：地震發(fā)生時(shí)，會(huì)使道路橋梁中斷，給交通帶來嚴(yán)重破壞。這也使得震后的救援工作困難重重，導(dǎo)致更加嚴(yán)重的生命和經(jīng)濟(jì)損失。大跨度混合梁斜拉橋是一種性能優(yōu)良、運(yùn)用廣泛的橋型，對(duì)該種類型的斜拉橋進(jìn)行抗震研究對(duì)橋梁設(shè)計(jì)和建設(shè)具有重要的指導(dǎo)意義。洋浦大橋是一座主跨為460m的混合梁斜拉橋，其地質(zhì)條件不理想，位于近海海域。本文以此為工程背景開展了如下的研究內(nèi)容： （1）研究了混合梁斜拉橋的發(fā)展歷程和國內(nèi)外混合梁斜拉橋減震設(shè)計(jì)現(xiàn)狀。以大跨度混合梁斜拉橋－洋浦大橋?yàn)楣こ瘫尘埃�，采用大型有限元分析軟件MIDAS/CIVIL2010分別建立了有樁土和無樁土兩種全橋空間模型，并對(duì)其分別進(jìn)自振特性分析，研究兩種模型自振特性的差異。 （2）討論現(xiàn)有地震動(dòng)力分析方法的優(yōu)缺點(diǎn)，分別對(duì)有樁土和無樁土采用反應(yīng)譜分析和時(shí)程分析。比較兩種模型在地震荷載作用下的動(dòng)力響應(yīng)，并將反應(yīng)譜分析結(jié)果和時(shí)程分析結(jié)構(gòu)做了對(duì)比。 （3）采用粘滯阻尼器進(jìn)行減震設(shè)計(jì)，研究粘滯阻尼器對(duì)混合梁斜拉橋地震動(dòng)力響應(yīng)的影響。并對(duì)阻尼器的參數(shù)進(jìn)行優(yōu)化，選擇一組最佳參數(shù)組合。采用兩種阻尼器布置方案：主塔處布置阻尼器、輔助墩和主塔均布置阻尼器，對(duì)比減震效果。 上述研究表明，選取合適的阻尼器參數(shù)，在主塔和輔助墩處對(duì)稱布置阻尼器能很好的控制主橋在地震作用下的縱向位移，并且主橋的內(nèi)力響應(yīng)同時(shí)減小。此方案提高了斜拉橋的抗震能力和耐久性，符合減震設(shè)計(jì)的思想。可供其他類型橋梁的抗震分析及減震設(shè)計(jì)參考。
[Abstract]:When an earthquake occurs, the road and bridge will be interrupted and the traffic will be seriously damaged. This also makes relief efforts after the earthquake difficult, resulting in more serious loss of life and economic losses. The long-span hybrid beam cable-stayed bridge is a kind of bridge with excellent performance and widely used. The seismic research on this type of cable-stayed bridge is of great significance for the design and construction of the bridge. Yangpu Bridge is a mixed-beam cable-stayed bridge with main span of 460 m. Its geological conditions are not ideal and it is located in offshore waters. The main contents of this paper are as follows: (1) the development history of hybrid beam cable-stayed bridge and the present situation of seismic damping design of hybrid beam cable-stayed bridge at home and abroad are studied. Taking the long-span mixed-beam cable-stayed bridge-Yangpu Bridge as the engineering background, the spatial models of pile-soil bridge and non-pile-soil bridge are established by using the large-scale finite element analysis software MIDAS/CIVIL2010, and the natural vibration characteristics of each bridge are analyzed. The difference of natural vibration characteristics between the two models is studied. (2) the advantages and disadvantages of the existing seismic dynamic analysis methods are discussed, and the response spectrum analysis and time history analysis are applied to the pile-soil and the non-pile-soil respectively. The dynamic responses of the two models under earthquake loads are compared, and the results of response spectrum analysis are compared with those of time history analysis structures. (3) the influence of viscous damper on seismic response of hybrid beam cable-stayed bridge is studied by using viscous damper. The parameters of the damper are optimized and a set of optimal parameters are selected. Two kinds of damper arrangement schemes are adopted: the main tower is equipped with dampers, the auxiliary piers and the main towers are arranged with dampers, and the damping effects are compared. The results show that the longitudinal displacement of the main bridge under earthquake can be well controlled and the internal force response of the main bridge can be reduced at the same time by selecting the appropriate damper parameters and arranging the dampers symmetrically at the main tower and the auxiliary pier. This scheme improves the seismic capacity and durability of cable-stayed bridges, and accords with the idea of damping design. It can be used as a reference for seismic analysis and damping design of other types of bridges.
【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)】：U442.55;U448.27

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本文編號(hào)：2444102