本文選題：活動支座摩擦力　切入點：運動相互作用　出處：《煙臺大學》2017年碩士論文　論文類型：學位論文

【摘要】：地震的發(fā)生對橋梁結構的安全性具有極大的威脅,若橋梁在地震中受損而喪失使用功能,除了會造成人員傷亡與財產(chǎn)損失外,也會影響救災搶險工作。因此研究橋梁結構的震害,研究支座摩擦作用的不利影響,研究造價低、易于更換的減隔震裝置對減少地震損失、確保震后交通暢通具有重大的理論與實際意義。本文對支座對橋梁結構的地震反應進行研究,重點分析橋墩間運動相互作用對連續(xù)梁橋彈塑性地震反應的不利影響,并提出防止落梁、控制梁體位移且又不顯著增大橋梁結構的地震反應的新型減隔震裝置。地震中,活動支座的摩擦力可以通過主梁傳遞給固定支座墩,引起橋墩間運動相互作用,為研究這種相互作用對連續(xù)梁橋彈塑性地震反應的影響,本文考慮地震時主梁和活動支座墩間的摩擦作用及橋墩可能進入的塑性狀態(tài),建立不同墩高的連續(xù)梁橋有限元分析模型,利用非線性動態(tài)時程分析法進行分析,對不同方案下的固定墩墩底最大曲率進行底部分析,找出活動支座摩擦作用使固定支座墩抗震性能產(chǎn)生不利的情況,并進一步分析各墩墩頂速度時程曲線,發(fā)現(xiàn)如果通過主梁傳遞的摩擦力的方向與固定支座墩本身的振動方向相同,則活動支座摩擦作用對固定支座墩的地震反應起到不利的增大作用。研究橋墩間運動相互作用對連續(xù)梁橋彈塑性地震反應的影響,對確保橋梁整體結構具有足夠的抗震性能具有非常重要的意義。設置減隔震裝置是目前提高橋梁結構抗震性能的一種有效措施。但是結構的抗震設計思維多以單道防線為主,無法滿足橋梁結構對抗震構造措施耗能與強度的雙重要求。因此本文在現(xiàn)有構造措施的基礎上,以“多道防線、功能分離、逐級生效”為原則,采用耗能構件與強度構件分離的設計方法,提出減震榫位移控制榫新型結構體系。本文從理論上分析了減震榫位移控制榫的工作過程,并分析了每個階段的單元恢復力圖形。在有限元模擬上,本文以某一連續(xù)梁橋為工程背景,對比分析了五種情況下的有限元模型,發(fā)現(xiàn)減震榫位移控制榫比單道防線更有利于從耗能和強度上提高橋梁結構的抗震性能。結合減震榫位移控制榫裝置的設計原理,對影響減震效果的主要參數(shù)的大小進行調(diào)節(jié),研究參數(shù)的變化對橋梁結構抗震性能的影響。減震榫位移控制榫新型結構體系的提出對提高橋梁結構的抗震能力和抗震水平有一定的參考價值。
[Abstract]:The occurrence of earthquake is a great threat to the safety of bridge structure. If the bridge is damaged in the earthquake and loses its function, it will cause casualties and property losses. Therefore, the earthquake damage of bridge structure, the adverse effect of bearing friction, the low cost and easy-to-replace isolation device can reduce the earthquake loss. It is of great theoretical and practical significance to ensure the smooth traffic after the earthquake. In this paper, the seismic response of the support to the bridge structure is studied, and the adverse effect of the dynamic interaction between the piers on the elastoplastic seismic response of the continuous beam bridge is analyzed. A new type of isolation device for preventing beam falling, controlling beam body displacement and not significantly increasing the seismic response of bridge structure is proposed. In earthquake, the friction of movable support can be transferred to the fixed support pier through the main beam. In order to study the effect of the interaction on the elastoplastic seismic response of continuous beam bridge, the friction between the main beam and the movable support pier and the plastic state that the pier may enter during the earthquake are considered in this paper. The finite element analysis model of continuous beam bridge with different piers height is established. The nonlinear dynamic time history analysis method is used to analyze the bottom of fixed pier bottom with maximum curvature under different schemes. Find out the unfavorable seismic behavior of the fixed support pier caused by the friction action of the movable support, and further analyze the velocity time history curve of the pier top. It is found that if the direction of friction transmitted through the main beam is the same as the vibration direction of the fixed bearing pier itself, Therefore, the frictional action of the movable support has an adverse effect on the seismic response of the fixed support pier, and the effect of the dynamic interaction between the piers on the elastoplastic seismic response of the continuous beam bridge is studied. It is very important to ensure that the whole bridge structure has enough seismic performance. It is an effective measure to improve the seismic performance of bridge structure by setting up the isolation device. However, the seismic design thinking of the structure is dominated by the single line of defense. It can not meet the dual requirements of energy consumption and strength of seismic structural measures for bridge structure. Therefore, based on the existing structural measures, the principle of "multi-defense lines, separation of functions, step by step effectiveness" is taken as the principle. Using the design method of separating the energy dissipation member from the strength member, a new structure system of the displacement control tenon of the damping tenon is proposed. The working process of the displacement control tenon of the damping tenon is analyzed theoretically in this paper. In the finite element simulation, a continuous beam bridge is taken as the engineering background, and the finite element models under five conditions are compared and analyzed. It is found that the damped displacement control tenon is better than the single line of defense in improving the seismic performance of the bridge structure in terms of energy dissipation and strength. Combined with the design principle of the mortise control device, the magnitude of the main parameters affecting the damping effect is adjusted. The influence of the change of parameters on the seismic performance of bridge structure is studied. The proposed new structural system with mortise displacement control tenon has certain reference value for improving the aseismic capacity and seismic level of bridge structure.
【學位授予單位】：煙臺大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U442.55

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