發(fā)布時間：2018-04-13 18:25

  本文選題：靜載試驗 + 動載試驗　； 參考：《華南理工大學》2014年碩士論文

【摘要】：近年來，由于質量缺陷、車輛超載、洪水暴雨、年久失修、日常管護不到位等原因已經發(fā)生了不少橋梁安全事故。通過定期檢測對橋梁結構的技術狀況進行評價，并根據檢測結果對橋梁結構進行動靜載試驗，對檢測中發(fā)現(xiàn)的薄弱部分的承載能力進行檢驗評定，及早發(fā)現(xiàn)存在的危及結構安全的隱患，對確保橋梁結構的安全起到至關重要的作用。橋梁動靜載試驗是對橋梁結構進行直接加載測試的一項科學試驗工作，是評價橋梁質量最直接和有效的方法和手段，特別適應于對斜拉橋、懸索橋等復雜高階超靜定橋梁的工作性能鑒定。 本文根據斜拉橋的結構特點，通過有限元軟件建立李家沙特大橋的計算模型，制定其動靜載試驗方案，并對動靜載試驗測試數據進行分析，判斷橋梁結構的實際工作狀態(tài)情況。研究內容包括： ⑴總結大跨徑橋梁靜動載試驗的基本理論； ⑵闡述斜拉橋的結構特點及計算方法，并用有限元軟件MIDAS/Civil分別建立了李家沙特大橋的單主梁和雙主梁計算模型，對實橋進行了靜、動力分析，，得出各控制截面在設計荷載及試驗荷載作用下的效應和橋梁的模態(tài)，比較兩種模型計算結果的差別。 ⑶通過靜載試驗，測定橋梁在各工況試驗荷載作用下控制截面的應變和位移，并與理論計算值進行比較分析，評價橋梁結構的在靜力荷載作用下的力學性能是否滿足設計要求。 ⑷通過脈動試驗、有障礙和無障礙跑車試驗測試橋梁結構各階固有頻率、阻尼比、振型和動力系數等特征參數，進而分析評價橋梁的剛度和承受動力荷載的能力。 ⑸綜合評價橋梁的結構實際工作性能，為橋梁的交竣工驗收和將來的養(yǎng)護維修工作提供科學依據。
[Abstract]:In recent years, many bridge safety accidents have occurred due to quality defects, overloading of vehicles, flood and torrential rain, years of disrepair and inadequate management and maintenance.The technical condition of the bridge structure is evaluated by periodic inspection, and the dynamic and static load tests are carried out on the bridge structure according to the test results, and the load-carrying capacity of the weak part found in the detection is tested and evaluated.Early detection of hidden dangers to structural safety plays a vital role in ensuring the safety of bridge structures.The bridge dynamic and static load test is a scientific test work for the bridge structure, which is the most direct and effective method and means to evaluate the bridge quality, especially for the cable-stayed bridge.Performance evaluation of complex high order statically indeterminate bridges such as suspension bridges.According to the structural characteristics of cable-stayed bridge, this paper establishes the calculation model of Lijia-Saudi Bridge by finite element software, formulates its dynamic and static load test scheme, analyzes the test data of static and static load test, and judges the actual working state of the bridge structure.The research includes:1 summarize the basic theory of static and dynamic load test of long span bridge;(2) the structural characteristics and calculation method of cable-stayed bridge are expounded. The calculation models of single and double main beams of Lijiazat Bridge are established by using finite element software MIDAS/Civil, and the static and dynamic analysis of the real bridge is carried out.The effects of each control section under the action of design load and experimental load and the modes of the bridge are obtained, and the differences between the results of the two models are compared.(3) through static load test, the strain and displacement of the control section of the bridge under various working conditions are measured, and compared with the theoretical calculation value, the mechanical performance of the bridge structure under static load is evaluated whether or not it meets the design requirements.(4) through pulsating test, obstacle test and barrier-free sports car test, the natural frequency, damping ratio, mode shape and dynamic coefficient of the bridge structure are tested, and the stiffness of the bridge and the ability to bear dynamic load are analyzed and evaluated.(5) Comprehensive evaluation of the actual performance of the bridge structure provides scientific basis for the completion acceptance of the bridge and the maintenance and repair of the bridge in the future.
【學位授予單位】：華南理工大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U446;U448.27

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