【摘要】：寧波車站改建工程中臨時(shí)便橋設(shè)計(jì)采用的連續(xù)剛構(gòu)雙線鐵路便橋?yàn)閲鴥?nèi)首創(chuàng)。必須滿足上跨軟土深基坑干線鐵路便橋動(dòng)力性能評(píng)估的需要,以確�？拓浟熊嚢踩椒�(wěn)通過便橋結(jié)構(gòu)。本文在總結(jié)分析國內(nèi)外臨時(shí)便橋工作性能及車橋耦合振動(dòng)分析已有研究成果的基礎(chǔ)上,對(duì)車橋系統(tǒng)的空間耦合振動(dòng)進(jìn)行了分析。針對(duì)工程跨越軟土深基坑,且必須保證既有鐵路線路的正常安全運(yùn)行的工程特點(diǎn),計(jì)算分析了深基坑不同施工狀態(tài)、不同便橋結(jié)構(gòu)方案的結(jié)構(gòu)動(dòng)力特性,系統(tǒng)闡述了鋼格構(gòu)柱便橋結(jié)構(gòu)自身的動(dòng)力性能。而后,采用隨機(jī)振動(dòng)理論,動(dòng)力仿真了客貨列車以限定時(shí)速通過有連續(xù)墻支撐便橋結(jié)構(gòu)(狀態(tài)II)的全過程,全面分析了列車運(yùn)營性能和便橋結(jié)構(gòu)的動(dòng)力響應(yīng),并在95%保證率基礎(chǔ)上與現(xiàn)場(chǎng)實(shí)測(cè)值進(jìn)行了對(duì)照。最后,模擬計(jì)算了不同速度運(yùn)行的客貨列車與考慮樁基彈性的鋼筋混凝土板梁—鋼格構(gòu)柱系統(tǒng)的空間耦合振動(dòng)響應(yīng)。結(jié)合我國現(xiàn)有規(guī)范及研究成果,在統(tǒng)計(jì)意義上綜合評(píng)估了對(duì)應(yīng)最大挖土深度的連續(xù)墻支撐便橋結(jié)構(gòu)(狀態(tài)V)的豎、橫向剛度;揭示了列車與鋼格構(gòu)柱便橋結(jié)構(gòu)的耦合振動(dòng)機(jī)理,提出了優(yōu)化便橋結(jié)構(gòu)設(shè)計(jì)的建議。
[Abstract]:The continuous rigid frame double-line railway bridge is the first one in Ningbo station reconstruction project. It is necessary to meet the needs of evaluating the dynamic performance of the trunk railway bridge of deep foundation pit over the soft soil in order to ensure the passenger and cargo trains to pass through the bridge structure safely and smoothly. On the basis of summarizing and analyzing the performance of temporary bridge at home and abroad and the analysis of vehicle-bridge coupling vibration, the spatial coupling vibration of vehicle-bridge system is analyzed in this paper. In view of the engineering characteristics that the project spans the soft soil deep foundation pit and must ensure the normal and safe operation of the existing railway lines, the structural dynamic characteristics of the deep foundation pit under different construction conditions and different bridge structure schemes are calculated and analyzed. The dynamic performance of steel latticed column bridge is systematically expounded. Then, by using random vibration theory, the whole process of passenger and freight train passing through the bridge structure (state II) with continuous wall at a limited speed is simulated, and the train operation performance and the dynamic response of the bridge structure are analyzed. On the basis of 95% guarantee rate, it was compared with the field measured value. Finally, the spatial coupled vibration responses of passenger and freight trains with different speeds and reinforced concrete beam-steel lattice column systems with elastic pile foundation are simulated. Combined with the existing codes and research results in our country, the vertical and lateral stiffness of the continuous wall supporting bridge structure (state V) corresponding to the maximum excavation depth is comprehensively evaluated in the statistical sense. The mechanism of coupling vibration between train and steel latticed column bridge structure is revealed, and some suggestions for optimizing the structure design of the bridge are put forward.
【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】：2015
【分類號(hào)】：U441;U448.13

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本文編號(hào)：2339028