【摘要】：近年來,跨海、跨江工程成為橋梁工程的熱點話題,多塔多跨懸索橋在跨海通道的建設中優(yōu)勢明顯。在多塔多跨懸索橋中,三塔懸索橋方案備受橋梁工程師的青睞。三塔懸索橋可減小主跨跨徑,降低主纜拉力,綜合性能好于同跨度的雙塔懸索橋。以施工控制和地震響應為研究方向,本文的前半部分分析了一座大跨度三塔懸索橋橋塔施工控制中的若干問題；后半部分對其自振特性,尤其是地震荷載下的時程響應和行波效應問題進行了研究。本文的主要工作包含以下幾個方面：(1)以正裝計算法為理論基礎,模擬了橋塔建造的全過程,跟蹤計算了整個過程中橋塔及臨時支撐結構的應力與變形,為施工工序和臨時結構的設計和施工提供了計算依據(jù),以保證施工中間狀態(tài)和成橋后的力學指標符合設計要求。(2)建立以“魚骨梁”模型為基礎的有限元模型,分析成橋狀態(tài)下三塔懸索橋的自振特性。將計算得到的該橋前十階自振頻率與振型與同類型的懸索橋相比較,得出三塔懸索橋自振特性的相同與不同之處。(3)采用一致激勵的方法,討論縱向波+豎向波、橫向波+豎向波與三向波這三種地震波組合形式對地震時程響應的影響,并計算分析了三向地震波輸入下三塔懸索橋地震時程響應的特點。結論表明三塔懸索橋加勁梁的橫向剛度較差,中塔內(nèi)力約為邊塔的2-3倍。(4)最后,本文研究了視波速取值范圍為360m/s-2160m/s的地震波的行波效應對三塔懸索橋地震響應的影響。結論認為行波效應對結構的影響依賴于視波速的選取,實際工程中應根據(jù)場地地質(zhì)條件選取合適的視波速。
[Abstract]:In recent years, cross-sea and cross-river projects have become a hot topic in bridge engineering, and the advantages of multi-tower and multi-span suspension bridges in the construction of cross-sea passage are obvious. In multi-tower multi-span suspension bridge, three-tower suspension bridge is favored by bridge engineers. The three-tower suspension bridge can reduce the span of the main span and reduce the tension of the main cable. The comprehensive performance of the three-tower suspension bridge is better than that of the double-tower suspension bridge with the same span. Taking construction control and seismic response as the research direction, some problems in the construction control of a long-span three-tower suspension bridge tower are analyzed in the first half of this paper. In the latter part, the natural vibration characteristics, especially the time-history response and traveling wave effect under earthquake load are studied. The main work of this paper includes the following aspects: (1) the whole construction process of the bridge tower is simulated, and the stress and deformation of the bridge tower and temporary supporting structure are calculated in the whole process based on the formal calculation method. It provides calculation basis for the design and construction of construction process and temporary structure, so as to ensure that the intermediate state of construction and the mechanical indexes after completion of the bridge meet the design requirements. (2) the finite element model based on the "fishbone beam" model is established. The natural vibration characteristics of three tower suspension bridges are analyzed. By comparing the first ten natural frequencies and modes of the bridge with the same type of suspension bridge, the similarities and differences of the natural vibration characteristics of the three-tower suspension bridge are obtained. (3) the vertical wave of longitudinal wave is discussed by using the method of consistent excitation. The influence of three seismic wave combinations of transverse wave vertical wave and three-direction wave on the seismic time-history response is analyzed and the characteristics of seismic time-history response of the three-tower suspension bridge under the three-direction seismic wave input are calculated and analyzed. The results show that the lateral stiffness of the stiffened beam of the three-tower suspension bridge is poor, and the internal force of the middle tower is about 2-3 times that of the side tower. (4) finally, In this paper, the influence of traveling wave effect of seismic wave on seismic response of three-tower suspension bridge with apparent wave velocity range of 360m/s-2160m/s is studied. The conclusion is that the influence of traveling wave effect on the structure depends on the selection of apparent wave velocity, and the appropriate apparent wave velocity should be selected according to the geological conditions of the site in practical engineering.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U448.25;U442.55

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本文編號：2302134