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  本文關(guān)鍵詞：基于靜動載試驗吉安贛江公路大橋承載力評定　出處：《合肥工業(yè)大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 既有橋梁 承載力評估 靜載試驗 動載試驗 模態(tài)參數(shù)識別

【摘要】：橋梁工程是關(guān)乎國計民生的重要基礎(chǔ)設(shè)施,其承載能力和通行能力是保持交通線路暢通的關(guān)鍵。隨著時間的推移,越來越多既有橋梁因各種原因發(fā)生損傷,導致結(jié)構(gòu)功能不足,橋梁承載力下降,從而影響橋梁的正常使用,需要對既有橋梁的狀況進行評估。承載力評定是橋梁評估的關(guān)鍵內(nèi)容,本文以吉安贛江公路大橋主橋為工程背景,進行了基于靜動載試驗橋梁承載力評定。首先進行了外觀調(diào)查和無損檢測,并對橋梁承載力作出初步的定性分析。隨后進行了靜載試驗、環(huán)境振動試驗和車輛激勵試驗,識別出了動力特性和沖擊系數(shù),對橋梁承載力進行定性評估。根據(jù)原始設(shè)計資料,建立了吉安贛江公路大橋主橋的初始有限元模型,進行參數(shù)的頻率敏感性分析,選出對頻率影響敏感的結(jié)構(gòu)參數(shù),以環(huán)境振動試驗實測的動力特性結(jié)果為基礎(chǔ),合理調(diào)整初始有限元的參數(shù),使得有限元模型計算結(jié)果與實測結(jié)果盡可能地吻合,得到反映橋梁的實際工作狀態(tài)的有限元模型。最后基于調(diào)整后有限元模型對該橋的承載力進行了更詳細的評定和預測。本文建立的既有橋梁承載力評定方法和流程,可供其它既有橋梁承載力評定參考。論文的主要工作如下:1.對吉安贛江公路大橋主橋進行了外觀檢測,統(tǒng)計了該橋的主要病害情況,并進行了混凝土強度檢測、混凝土碳化深度檢測、鋼筋保護層厚度檢測、鋼筋銹蝕檢測等無損檢測。依據(jù)相關(guān)評定規(guī)程,對橋梁各構(gòu)件分別評分后進行加權(quán)求和綜合評定,獲得了該橋的技術(shù)狀況等級和總體評價結(jié)果,為進一步評估橋梁的承載力做準備。2.根據(jù)吉安贛江公路大橋主橋原始設(shè)計資料,建立了該橋的初始有限元模型,先后進行了靜力驗算和模態(tài)分析。靜力驗算主要進行了影響線計算和基于影響線的活載計算,靜力驗算的目的在于獲取靜載試驗測試控制截面的具體位置和保證靜載試驗加載效率。而模態(tài)分析是為動載試驗中環(huán)境振動試驗做理論計算和提供測點參考位置。3.對吉安贛江公路大橋主橋首先進行了靜載試驗,獲得了橋梁的應變、撓度等數(shù)據(jù),結(jié)合靜力數(shù)值加載結(jié)果,對該橋的承載力進行初步評定。然后進行了環(huán)境振動試驗和車輛激勵試驗,獲得橋梁的動應變、加速度等數(shù)據(jù),實測得到了橋梁的沖擊系數(shù)。利用實測的環(huán)境振動加速度響應,分別采用頻域峰值法和時域隨機子空間識別相互校驗的方式,識別出了該橋的模態(tài)參數(shù),并與初始有限元結(jié)果進行了比較。對初始有限元模型的材料、幾何參數(shù)進行頻率的敏感性分析,調(diào)整初始有限元模型參數(shù),使有限元模型計算與環(huán)境振動試驗實測結(jié)果吻合,修正后的有限元模型更能夠反映橋梁的實際工作狀態(tài)。4.采用修正后的有限元模型對吉安贛江公路大橋主橋承載力進行更詳細的評估和預測。針對目前交通量增大和公路橋梁設(shè)計規(guī)范中汽車荷載的變化,計算了新規(guī)范下該橋汽車荷載在靜載試驗控制截面的內(nèi)力,并與舊規(guī)范進行了比較。最后通過有限元模型結(jié)構(gòu)參數(shù)退化模擬結(jié)構(gòu)損傷,使用修正后的有限元模型計算靜載試驗加載工況,采用等效檢驗系數(shù)方法,對吉安贛江公路大橋主橋未來的承載力進行評估,這也是基于修正后有限元模型進行既有橋梁承載力評估的優(yōu)越性所在。
[Abstract]:Bridge engineering is an important infrastructure for its carrying capacity and beneficial to the people's livelihood, capacity is the key to keep the traffic line smooth. With the passage of time, more and more bridges damage due to various reasons, resulting in insufficient bearing capacity of structure and function, thus affecting the normal use of the bridge fell, the bridge, the need to assess the existing bridge situation. Carrying capacity evaluation is the key content of bridge evaluation, in this paper, the main bridge of Ji'an Ganjiang highway bridge as the engineering background, the dynamic and static load test of bridge bearing capacity evaluation based on the external view. First, investigation and nondestructive testing, and make a preliminary qualitative analysis of bridge bearing capacity. Then the static load test. Environmental vibration test and vehicle test to identify the excitation, dynamic characteristics and impact factor, qualitative evaluation on the bearing capacity of the bridge. According to the original design, the establishment of Kyrgyzstan The initial finite element model of the bridge safety Ganjiang highway bridge, the frequency analysis of sensitivity parameters of the selected structural parameters sensitive effect on the frequency, to the dynamic characteristics of the measured environmental vibration test results as the basis, reasonable adjustment of initial parameters of finite element, the finite element model calculation results and the test results as much as possible with finite element model of the actual working conditions reflect the bridge. Finally adjusted based on the finite element model of bearing capacity of the bridge is evaluated and predicted more detailed. The existing bearing capacity evaluation method and process for other bridges, bridges carrying capacity assessment. The main contents are as follows: 1. the main bridge of Ji'an Ganjiang highway bridge of visual inspection, statistics of the main diseases of the bridge, and the strength test of concrete, concrete carbonation depth detection, reinforced protective layer The thickness of steel corrosion detection, detection of nondestructive testing. According to the relevant evaluation rules, respectively score for every member of the bridge after the weighted sum of the comprehensive evaluation, obtained the bridge the technical grade and overall evaluation results, to prepare.2. according to the original design of the main bridge of Ji'an Ganjiang Highway Bridge data for further evaluation of the bearing capacity of the bridge, set up the initial finite element model of the bridge, has analyzed the static checking and static checking mode. Mainly the influence of the line calculation and influence line based on live load calculation, static checking is to ensure access to the specific location and static load test control section of the static load test. The loading efficiency and modal analysis for dynamic load environmental vibration test tested the theoretical calculation and measurement for the reference point position.3. on the main bridge of Ji'an Ganjiang highway bridge was the first bridge static load test should be obtained Change, deflection data, combined with static loading numerical results, preliminary assessment of the carrying capacity of the bridge. Then the vibration environment test and vehicle excitation test, strain bridge, acceleration data, obtained the impact coefficient of the bridge. By the measured vibration acceleration response, respectively by frequency peak method the time domain and the stochastic subspace identification between parity means, to identify the modal parameters of the bridge, and compared with the initial finite element results. The finite element model of initial material, sensitivity analysis of geometric parameters of frequency, adjust the initial parameters of finite element model, the finite element model with the results of calculation and vibration test the measured and actual working condition of.4. modified finite element model can better reflect the bridge using the modified finite element model of the main bridge of Ji'an Ganjiang highway bridge bearing capacity Evaluate and forecast more detail. Aiming at the automobile load design specification for increased traffic and road bridge changes under the new standard of the bridge vehicle load in internal force static load test control section were calculated and compared with the old standard. Finally, the finite element model of structure parameter degradation simulation of structural damage calculation. The static load test of loading conditions using the modified finite element model, the test coefficient equivalent method to evaluate the bearing capacity of the future of Ganjiang highway bridge in Ji'an, this superiority is also based on the finite element model was modified after the evaluation of existing bridge bearing capacity.

【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U441

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本文編號：1392206