本文關(guān)鍵詞： 斜拉橋 極限狀態(tài) Pushover 能力譜 預警指標體系　出處：《山東大學》2017年碩士論文　論文類型：學位論文

【摘要】：本文以濟南黃河大橋為工程背景,通過有限元模擬研究該橋的三種極限狀態(tài),建立其安全預警指標體系,分析健康監(jiān)測系統(tǒng)采集到的監(jiān)測數(shù)據(jù),結(jié)合預警指標體系,評估其使用狀況。根據(jù)濟南黃河大橋?qū)嶋H參數(shù)建立其有限元模型,并對有限元模型進行修正優(yōu)化,使其更加符合橋梁實際的受力、變形狀態(tài);根據(jù)斜拉橋的結(jié)構(gòu)特點,選取結(jié)構(gòu)在各種極限狀態(tài)下的預警指標,利用Midas分析出各預警指標的結(jié)構(gòu)影響線,得出移動荷載最不利加載位置。結(jié)合橋梁設(shè)計規(guī)范中對正常使用和承載能力兩種極限狀態(tài)下荷載的定義,分別設(shè)計其相關(guān)的荷載組合,根據(jù)最不利加載位置進行車輛荷載加載。計算有限元模型在各種荷載組合作用下的預警指標響應值,得出有限元模型在兩種極限狀態(tài)下各指標的響應極值。簡要介紹幾種常見的結(jié)構(gòu)抗震理論,詳細介紹基于結(jié)構(gòu)性能抗震的Pushover和能力譜原理,給出地震荷載作用下結(jié)構(gòu)性能點的求解過程。根據(jù)Pushover的分析特點和濟南黃河大橋的結(jié)構(gòu)特點,分離出黃河大橋索塔和主梁模型,分別代表整橋模型在地震荷載和車輛荷載作用下的結(jié)構(gòu)響應。對索塔和主梁模型進行Pushover分析,結(jié)合能力譜方法,分別計算索塔在地震荷載和主梁在車輛荷載作用下的彈塑性變形最大值,并以此確定黃河大橋在地震和車輛荷載作用下的彈塑性變形能力極限狀態(tài)。通過有限元軟件Midas對濟南黃河大橋三種極限狀態(tài)的模擬分析,建立黃河大橋的安全預警指標體系。介紹斜拉橋預警指標體系建立的方法及過程,分析健康監(jiān)測數(shù)據(jù),結(jié)合預警指標體系,評估濟南黃河大橋的使用狀態(tài)。
[Abstract]:Taking the Jinan Yellow River Bridge as the engineering background, this paper studies the three limit states of the bridge by finite element simulation, establishes its safety early warning index system, analyzes the monitoring data collected by the health monitoring system, and combines the early warning index system. According to the actual parameters of the Jinan Yellow River Bridge, the finite element model is established, and the finite element model is modified and optimized to make it more in line with the actual stress and deformation of the bridge, and according to the structural characteristics of the cable-stayed bridge, Selecting the early warning index of structure under various limit states, using Midas to analyze the structure influence line of each early warning index, The most unfavorable loading position of moving load is obtained. Combined with the definition of load under two limit states of normal use and bearing capacity in the design code of bridge, the relevant load combinations are designed respectively. The vehicle load is loaded according to the most unfavorable loading position. The early warning index response value of the finite element model under various load combinations is calculated. The response extremum of each index of finite element model under two limit states is obtained. Several common aseismic theories of structures are briefly introduced, and the principle of Pushover and capacity spectrum based on the seismic behavior of structures is introduced in detail. According to the characteristics of Pushover and the structural characteristics of Jinan Yellow River Bridge, the cable tower and main beam model of Yellow River Bridge are separated. The structural response of the whole bridge model under earthquake load and vehicle load is represented respectively. The Pushover analysis of the cable tower and main beam model is carried out, and the capacity spectrum method is used. The maximum value of elastoplastic deformation of cable tower under earthquake load and main beam under vehicle load is calculated respectively. The limit state of the elastic-plastic deformation capacity of the Yellow River Bridge under earthquake and vehicle loads is determined. The simulation analysis of the three limit states of the Jinan Yellow River Bridge is carried out by the finite element software Midas. This paper introduces the method and process of the establishment of the early warning index system of the Yellow River Bridge, analyzes the health monitoring data, and evaluates the operational status of the Jinan Yellow River Bridge in combination with the early warning index system.
【學位授予單位】：山東大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U448.27

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