【摘要】：論文以70+80+200+80+70m異形斜塔斜拉橋?yàn)檠芯勘尘?運(yùn)用有限元軟件MIDAS/CIVIL建立全橋有限元模型。模型充分考慮樁-土之間的相互作用,參照實(shí)際情況準(zhǔn)確模擬橋梁的下部結(jié)構(gòu)和支座。在全橋模型的基礎(chǔ)上,運(yùn)用影響矩陣法和倒拆分析法分別確定斜拉橋成橋階段合理索力和施工階段合理索力,并對(duì)合理成橋階段和施工后成橋階段進(jìn)行對(duì)比,驗(yàn)證倒拆分析法的可行性。之后,對(duì)結(jié)構(gòu)成橋狀態(tài)的自振特性進(jìn)行分析,再分別采用反應(yīng)譜法、線性時(shí)程法和非線性時(shí)程法分析結(jié)構(gòu)的地震響應(yīng),并對(duì)反應(yīng)譜法與線性時(shí)程法進(jìn)行對(duì)比分析,檢驗(yàn)兩種方法的一致性,對(duì)線性時(shí)程法與非線性時(shí)程法進(jìn)行對(duì)比分析,得出減隔震支座對(duì)地震動(dòng)作用下結(jié)構(gòu)受力的影響。最后,運(yùn)用有限元軟件ALGOR建立基于桿單元、板單元和實(shí)體單元的全塔組合單元有限元模型,并對(duì)鋼錨箱區(qū)域局部加密,在此基礎(chǔ)上對(duì)索塔錨固區(qū)的各板件進(jìn)行應(yīng)力分析,由此校驗(yàn)鋼錨箱設(shè)計(jì)的合理性,并提出相關(guān)建議。
[Abstract]:Based on the research background of 70802008070m special-shaped inclined tower cable-stayed bridge, the finite element model of the whole bridge is established by using the finite element software MIDAS/CIVIL. The model fully considers the pile-soil interaction and accurately simulates the lower structure and support of the bridge according to the actual situation. On the basis of the whole bridge model, the influence matrix method and the reverse disassembly analysis method are used to determine the reasonable cable force in the bridge completion stage and the reasonable cable force in the construction stage, respectively, and the reasonable bridge completion stage and the bridge completion stage after construction are compared to verify the feasibility of the reverse demolition analysis method. After that, the natural vibration characteristics of the bridge state are analyzed, and then the seismic response of the structure is analyzed by response spectrum method, linear time equation method and nonlinear time equation method respectively, and the response spectrum method and linear time equation method are compared and analyzed to test the consistency of the two methods. The linear time equation method and nonlinear time equation method are compared and analyzed, and the influence of isolation bearing on the force of the structure under ground motion is obtained. Finally, the finite element model of the whole tower combination element based on rod element, plate element and solid element is established by using the finite element software ALGOR, and the local encryption of the steel anchor box area is carried out. on this basis, the stress analysis of each plate in the cable tower anchoring area is carried out, and the rationality of the steel anchor box design is verified, and some relevant suggestions are put forward.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U442.55;U448.27

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