【摘要】：矮塔斜拉橋是介于連續(xù)梁橋與斜拉橋之間的橋型,由索、塔、梁三種基本構(gòu)件組成的纜索承重組合體系,形式多樣、外形美觀、跨越能力大,具有塔矮、梁剛、索集中等優(yōu)點。矮塔斜拉橋也是施工工藝復雜、難度較大的一種橋型,確定合理施工狀態(tài)對矮塔斜拉橋的施工過程中結(jié)構(gòu)安全、主梁線形影響顯著,斜拉索具有可調(diào)性,合理選擇索力是矮塔斜拉橋施工過程中的關鍵問題。以常山矮塔斜拉橋工程為背景,建立Midas/Civil有限元模型對斜拉索進行索力分析計算。首先計算主梁的彎矩可行域,以主梁彎矩可行域驗證設計成橋索力的合理性,并以設計成橋索力作為合理成橋狀態(tài)索力,該組索力確定的成橋狀態(tài)即是常山矮塔斜拉橋的合理成橋狀態(tài)；然后以合理成橋狀態(tài)為目標,結(jié)合實際施工狀態(tài)在保證施工過程安全、合理的情況下,使用未知荷載系數(shù)正裝分析求解合理施工過程中斜拉索的張拉力,進行施工階段分析；最后使用壓力法和頻率法進行施工索力和成橋索力測試,檢驗施工索力和成橋索力是否滿足設計要求。對常山矮塔斜拉橋的合理施工狀態(tài)的索力進行研究,以未知荷載系數(shù)法確定合理施工狀態(tài)的索力,為相關斜拉橋的施工索力求解提供參考,具有現(xiàn)實研究意義。
[Abstract]:The cable-stayed bridge with low tower is a bridge type between continuous girder bridge and cable-stayed bridge. It is composed of cable, tower and beam. It has many forms, beautiful appearance, large span ability, and has the advantages of low tower, rigid beam, concentrated cable and so on. The low tower cable-stayed bridge is also a kind of bridge with complex construction technology and great difficulty. Determining the reasonable construction state has significant influence on the structural safety of the cable-stayed bridge in the construction process, the main beam line shape is significant, and the cable-stayed cable is adjustable. The rational selection of cable force is the key problem in the construction process of the cable-stayed bridge with low tower. Based on the engineering of Changshan low tower cable-stayed bridge, the Midas/Civil finite element model is established to analyze and calculate the cable force. At first, the feasible region of bending moment of the main beam is calculated. The rationality of the designed cable force is verified by the feasible region of the bending moment of the main beam, and the cable force of the designed bridge is taken as the reasonable cable force in the state of the bridge. The bridge state determined by this group of cable forces is the reasonable bridge state of Changshan low tower cable-stayed bridge. Then, aiming at the reasonable state of the bridge, combining with the actual construction state to ensure the safety of the construction process, under reasonable conditions, the tension of the cable in the reasonable construction process is solved by using the normal load coefficient of unknown load analysis, and the construction stage analysis is carried out. Finally, the construction cable force and the bridge cable force are tested by using the pressure method and the frequency method to verify whether the construction cable force and the bridge cable force meet the design requirements. This paper studies the cable force of the reasonable construction state of Changshan low tower cable-stayed bridge. The method of unknown load coefficient is used to determine the rational construction state cable force, which provides a reference for the solution of the construction cable of the relevant cable-stayed bridge, and has practical significance.
【學位授予單位】：東北林業(yè)大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：U445.4;U448.27

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