【摘要】：懸索橋?qū)偃嵝越Y(jié)構(gòu),一直以來困擾公鐵兩用懸索橋發(fā)展的是撓度問題而不是荷載問題,所以對公鐵兩用懸索橋剛度的討論分析很有必要。但是目前在鐵路懸索橋剛度方面仍缺乏足夠的實(shí)踐和研究,沒有相應(yīng)成熟的理論指導(dǎo)依據(jù)。本文針對公鐵兩用懸索橋剛度問題展開研究,主要完成了以下研究工作：(1)研究討論了懸索橋靜力計(jì)算和動力計(jì)算理論,為懸索橋的靜動力分析提供理論基礎(chǔ)。(2)本文以某大跨度公鐵兩用懸索橋?yàn)楣こ瘫尘?采用有限元軟件Midas Civil建立懸索橋的空間有限元計(jì)算模型。并對主纜吊索內(nèi)力分布、主梁內(nèi)力應(yīng)力、活載作用下的豎向撓度、豎向轉(zhuǎn)角及橫向風(fēng)荷載作用下的橫向撓度、轉(zhuǎn)角等靜力計(jì)算結(jié)果進(jìn)行了分析,并計(jì)算了全橋自振特性、在三個方向一致激勵下地震時程響應(yīng)等動力響應(yīng)結(jié)果。(3)文章選定了支撐體系、邊跨輔助橋墩布置方式、邊中跨比、垂跨比、纜梁連接方式、主梁截面形式、高跨比、寬跨比和節(jié)間長度等結(jié)構(gòu)參數(shù)進(jìn)行分析。將結(jié)構(gòu)參數(shù)分為整體結(jié)構(gòu)參數(shù)和主梁形式兩部分,通過改變結(jié)構(gòu)參數(shù),對比分析它們對懸索橋豎向剛度、橫向剛度的敏感性,總結(jié)歸納出提高大跨度公鐵兩用懸索橋剛度的有效措施。(4)對比分析結(jié)構(gòu)參數(shù)(支撐體系、邊跨輔助橋墩布置方式、邊中跨比、垂跨比、纜梁連接方式、主梁截面形式、高跨比、寬跨比和節(jié)間長度)對懸索橋自振特性和地震時程響應(yīng)的影響規(guī)律,從而歸納總結(jié)出具有良好動力性能的結(jié)構(gòu)參數(shù)選取原則。通過對大跨度公鐵兩用懸索橋關(guān)鍵設(shè)計(jì)參數(shù)的分析,橋梁剛度及動力響應(yīng)的結(jié)論可供同類型橋梁設(shè)計(jì)參考。
[Abstract]:Suspension bridge is a flexible structure, which has been bothering the development of highway and rail suspension bridge is deflection problem rather than load problem, so it is necessary to discuss and analyze the stiffness of highway and rail suspension bridge. But at present, the stiffness of railway suspension bridge is still lack of enough practice and research, and there is no relevant theoretical guidance. In this paper, the stiffness of the suspension bridge is studied. The main works are as follows: (1) the static and dynamic calculation theory of the suspension bridge is discussed. It provides a theoretical basis for static and dynamic analysis of suspension bridge. (2) in this paper, the finite element software Midas Civil is used to establish the spatial finite element model of suspension bridge. The internal force distribution of the main cable sling, the internal force stress of the main girder, the vertical deflection under the action of live load, the lateral deflection under the action of vertical rotation angle and the lateral wind load are analyzed, and the natural vibration characteristics of the whole bridge are calculated. The results of seismic time-history response are consistent in three directions. (3) the supporting system, the arrangement of side span auxiliary pier, the ratio of side to middle span, the ratio of vertical span to span, the connection mode of cable beam, the form of main beam section, the ratio of height to span are selected in this paper. The structural parameters such as width-span ratio and Internode length were analyzed. The structural parameters are divided into two parts: the integral structural parameters and the main beam form. By changing the structural parameters, the sensitivity of the structural parameters to the vertical and lateral stiffness of the suspension bridge is compared and analyzed. The effective measures to improve the stiffness of the long-span suspension bridge are summarized and summarized. (4) the structural parameters (support system, side span auxiliary pier arrangement, side to middle span ratio, vertical span ratio, cable beam connection mode, main beam section form, height span ratio) are compared and analyzed. The influence of width to span ratio and Internode length on the natural vibration characteristics and seismic time history response of suspension bridge is discussed, and the selection principle of structural parameters with good dynamic performance is summarized. Through the analysis of the key design parameters of the large-span suspension bridge, the conclusion of the stiffness and dynamic response of the bridge can be used as reference for the design of the same type of bridge.
【學(xué)位授予單位】：北京交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：U448.25

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