【摘要】：用于交通應(yīng)急用的高架浮橋以浮動(dòng)基礎(chǔ)代替固定基礎(chǔ),是戰(zhàn)時(shí)克服跨水體障礙進(jìn)行人員快速投送以及后勤物資運(yùn)輸?shù)闹匾Ｕ鲜侄巍６治龈虻耐ㄝd能力是重要一步,雖然試驗(yàn)是驗(yàn)算浮橋通車能力的最理想方法,但因試驗(yàn)成本大、耗時(shí)長(zhǎng)等特點(diǎn),故往往采用計(jì)算機(jī)有限元軟件模擬分析浮橋的動(dòng)力性能。本文以長(zhǎng)江上某一垮塌橋梁為研究背景,采用浮橋替代坍塌橋跨,結(jié)合長(zhǎng)江內(nèi)河特殊水文條件和《鐵路橋梁搶修規(guī)范》,分析了高架門橋的穩(wěn)性、水動(dòng)力特性和結(jié)構(gòu)強(qiáng)度,對(duì)鐵路浮橋的設(shè)計(jì)與驗(yàn)算提供一定的參考。首先進(jìn)行1 500 t方駁的設(shè)計(jì),基于SESAM軟件進(jìn)行數(shù)值模擬,對(duì)比分析梁與墩在三種支座約束下的穩(wěn)性,得出支座約束的最佳形式;根據(jù)門橋的實(shí)際長(zhǎng)度,驗(yàn)算不同浮墩間距下門橋自身的穩(wěn)性,得出最不利的墩距;研究梁上列車荷載的不同位置對(duì)門橋完整穩(wěn)性的影響,得出最不利的加載位置,作為后續(xù)計(jì)算分析的基礎(chǔ);對(duì)比分析不同的風(fēng)速對(duì)門橋傾覆力矩的影響及驗(yàn)算六級(jí)風(fēng)荷載作用下門橋系統(tǒng)能否達(dá)到穩(wěn)性標(biāo)準(zhǔn)要求。其次,概述門橋浮體結(jié)構(gòu)水動(dòng)力及運(yùn)動(dòng)響應(yīng)的計(jì)算理論,并進(jìn)行波浪搜索下高架門橋的水動(dòng)力及運(yùn)動(dòng)響應(yīng)研究;根據(jù)門橋在微幅波浪誘導(dǎo)下的水動(dòng)力計(jì)算結(jié)果,分析了頻幅響應(yīng)內(nèi)不同水深、不同波浪入射角條件下門橋附加質(zhì)量、輻射阻尼、一階波激力、平均二階漂移力的變化規(guī)律。最后,應(yīng)用基于譜分析的設(shè)計(jì)波法完成了浮式門橋波浪誘導(dǎo)載荷的長(zhǎng)期預(yù)報(bào),該方法關(guān)鍵之處在于確定具有代表性的剖面波浪載荷。以規(guī)則波下計(jì)算出的載荷傳遞函數(shù)為基礎(chǔ),創(chuàng)建波浪散布圖,定義超越概率水平和重現(xiàn)周期,進(jìn)一步闡述了波浪載荷控制參數(shù)長(zhǎng)期預(yù)報(bào)的計(jì)算過(guò)程,得到一定超越概率水平波浪載荷,從而得出設(shè)計(jì)波參數(shù),實(shí)現(xiàn)單位波幅下的結(jié)構(gòu)響應(yīng)。與此同時(shí),將實(shí)際波幅與相位角進(jìn)行結(jié)果組合得出實(shí)際浮橋結(jié)構(gòu)應(yīng)力,并根據(jù)《鐵路橋梁搶修規(guī)范》,對(duì)梁進(jìn)行了強(qiáng)度驗(yàn)算。最后進(jìn)行不同浮墩間距下梁的內(nèi)力計(jì)算,得出門橋合理的浮墩間距。
[Abstract]:The floating foundation is used to replace the fixed foundation of the elevated floating bridge which is used for traffic emergency. It is an important guarantee means to overcome the obstacle of crossing the water for the rapid delivery of personnel and the transportation of logistics and materials in wartime. It is an important step to analyze the loading capacity of floating bridge. Although the test is the most ideal method for checking the capacity of the floating bridge, because of the characteristics of high test cost and long time consuming, the finite element software of computer is often used to simulate and analyze the dynamic performance of the floating bridge. Taking a collapsing bridge on the Yangtze River as the research background, the floating bridge is used to replace the collapsed bridge span, combined with the special hydrological conditions of the Yangtze River and the Code for the urgent repair of Railway Bridges, the stability, hydrodynamic characteristics and structural strength of the elevated gate bridge are analyzed. It provides a certain reference for the design and checking calculation of railway floating bridge. Firstly, the design of 1 500t square barge is carried out, and the numerical simulation based on SESAM software is carried out, and the stability of beam and pier under three kinds of support constraints is compared and analyzed, and the optimum form of support constraint is obtained, according to the actual length of gate bridge, By checking the stability of the portal bridge under different floating pier spacing, the most unfavorable pier spacing is obtained, and the influence of the different position of train load on the beam on the integrity stability of the portal bridge is studied, and the most unfavorable loading position is obtained, which is the basis of subsequent calculation and analysis. The influence of different wind speed on the overturning moment of the portal bridge and the checking calculation of whether the gate-bridge system can meet the stability standard under the action of six-stage wind load are compared and analyzed. Secondly, the calculation theory of hydrodynamic and motion response of floating structure of portal bridge is summarized, and the hydrodynamic and kinematic response of elevated portal bridge under wave search is studied, according to the hydrodynamic calculation results of portal bridge induced by micro-wave, The variation of the additional mass, radiation damping, first-order wave-induced force and average second-order drift force of the gate bridge under different water depths and different wave incident angles in the frequency amplitude response are analyzed. Finally, the design wave method based on spectral analysis is used to complete the long-term prediction of wave induced loads of floating gate bridges. The key point of this method is to determine the representative wave loads in the profile. Based on the load transfer function calculated under the regular wave, the wave scatter diagram is created, the level of surpassing probability and the recurrence period are defined, and the calculation process of the long-term prediction of wave load control parameters is further expounded. The horizontal wave loads with a certain transcendence probability are obtained, and the design wave parameters are obtained to realize the structural response under the unit wave amplitude. At the same time, the actual structural stress of floating bridge is obtained by combining the results of actual wave amplitude and phase angle, and the strength of the beam is checked according to the Code of Railway Bridge repair. Finally, the internal force of the beam under different floating pier spacing is calculated, and the reasonable floating pier spacing of the exit bridge is obtained.
【學(xué)位授予單位】：石家莊鐵道大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：U441;U448.19

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本文編號(hào)：2229058