本文選題：多尺度模型 + 車橋耦合振動　； 參考：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：以往的公路橋梁車橋耦合振動的相關(guān)研究，主要關(guān)注車輛荷載作用形式、橋面幾何特征等因素對橋梁動力響應(yīng)的影響、考慮地震或風(fēng)荷載作用下的車橋系統(tǒng)動力響應(yīng)等問題。而對于既有橋梁各種損傷狀況對車載下橋梁動力工作性能的影響規(guī)律，以及結(jié)構(gòu)損傷、損傷演化與車橋動力行為的相互作用機(jī)理等方面還未見系統(tǒng)深入的研究，相關(guān)的基礎(chǔ)研究工作亟待開展。在橋梁運營過程中，橋梁結(jié)構(gòu)損傷與車橋耦合作用已是影響橋梁安全運行的重要因素之一。本文針對既有損傷橋梁在車載下的動力響應(yīng)等相關(guān)問題進(jìn)行分析研究。 依據(jù)交通荷載調(diào)查分類，分別建立各類車型的空間車輛模型，并用Lagrange方程推導(dǎo)各類車輛運動方程，完善了公路橋梁典型車輛的動力分析模型�；诙嗉壗Y(jié)構(gòu)理論以及模態(tài)綜合法，建立了具有較高計算效率和精度，可反映混凝土簡支梁橋局部細(xì)節(jié)及整體動力行為的車橋耦合振動的多尺度分析方法和計算模型，結(jié)合ANSYS有限元軟件計算分析，采用Matlab編制混凝土簡支梁橋動力分析程序，并根據(jù)某實際裝配式空心板混凝土簡支梁橋的動載試驗進(jìn)行程序驗證。 以既有舊橋試驗檢測數(shù)據(jù)資料為基礎(chǔ)并結(jié)合國內(nèi)外相關(guān)資料和研究文獻(xiàn)的調(diào)研，系統(tǒng)分析混凝土梁橋各類典型損傷的產(chǎn)生機(jī)理和演化特點，對橋梁損傷進(jìn)行分類，同時對各種橋梁損傷模擬策略和方法進(jìn)行總結(jié)比較，提出并建立適于車橋動力分析的混凝土梁橋損傷的數(shù)值分析模型。 基于損傷模擬及車橋耦合振動多尺度分析方法的基礎(chǔ)上，針對損傷類型和損傷狀態(tài)，，將損傷模型引入到橋梁多尺度分析模型中，通過對結(jié)構(gòu)損傷參數(shù)的激活和修改，建立各類損傷的混凝土梁橋車橋耦合振動多尺度分析方法，編制相關(guān)的分析程序。最后以某裝配式空心板混凝土簡支梁橋為例，分析其在各類損傷下的動力響應(yīng)，同時基于動力分析的角度，對既有損傷混凝土簡支梁橋的限載限速研究提供理論依據(jù)。
[Abstract]:Previous studies on vehicle-bridge coupling vibration of highway bridges mainly focus on the effects of vehicle load forms, bridge deck geometry and other factors on the dynamic responses of bridges, and consider the dynamic responses of vehicle-bridge systems under earthquake or wind loads. However, the influence of various damage conditions of existing bridges on the dynamic performance of bridges under vehicle, as well as the structural damage, the mechanism of interaction between damage evolution and vehicle-bridge dynamic behavior, has not been systematically studied. Relevant basic research work needs to be carried out urgently. In the process of bridge operation, the coupling of bridge structure damage and vehicle-bridge is one of the important factors that affect the safe operation of bridge. In this paper, the dynamic response of existing damaged bridges under vehicle is analyzed and studied. According to the classification of traffic load investigation, the spatial vehicle models of various types of vehicles are established, and the motion equations of various types of vehicles are deduced by using Lagrange equation, which improves the dynamic analysis model of typical vehicles of highway and bridge. Based on multi-stage structure theory and modal synthesis method, a multi-scale analysis method and calculation model of vehicle-bridge coupling vibration with high calculation efficiency and precision, which can reflect the local details and global dynamic behavior of concrete simply supported beam bridge are established. Combined with the finite element analysis of ANSYS software, the dynamic analysis program of concrete simply supported beam bridge is compiled by Matlab, and the program is verified according to the dynamic load test of a practical hollow slab concrete simply supported beam bridge. Based on the existing old bridge test data, combined with the domestic and foreign related data and research literature, the mechanism and evolution characteristics of various typical damage of concrete girder bridge are analyzed systematically, and the damage classification of the bridge is carried out. At the same time, the damage simulation strategies and methods of various bridges are summarized and compared, and a numerical analysis model of concrete beam bridge damage suitable for vehicle-bridge dynamic analysis is proposed and established. Based on the damage simulation and the multi-scale analysis method of vehicle-bridge coupling vibration, the damage model is introduced into the bridge multi-scale analysis model according to the damage type and damage state, and the damage parameters are activated and modified. The multi-scale analysis method of vehicle-bridge coupling vibration of concrete girder bridge with various kinds of damage was established and the related analysis program was compiled. Finally, taking a prefabricated hollow slab concrete simply supported beam bridge as an example, the dynamic response of the bridge under various kinds of damage is analyzed. At the same time, based on the angle of dynamic analysis, it provides a theoretical basis for the research of limited load and speed limit of existing damaged concrete simply supported beam bridge.
【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.3

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