本文關(guān)鍵詞：基于WIM數(shù)據(jù)的上海長(zhǎng)江隧橋錨固結(jié)構(gòu)壽命評(píng)估　出處：《南京航空航天大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 動(dòng)態(tài)稱重系統(tǒng) 索梁鋼錨箱 索塔鋼錨箱 ANSYS應(yīng)力云圖 應(yīng)力歷程 應(yīng)力譜 疲勞壽命評(píng)估

【摘要】：本文結(jié)合上海長(zhǎng)江隧橋的動(dòng)態(tài)稱重系統(tǒng)（WIM）所采集的車輛信息數(shù)據(jù)，以索梁和索塔錨固區(qū)的鋼錨箱作為研究對(duì)象，采用名義應(yīng)力法評(píng)估其疲勞壽命，并對(duì)結(jié)構(gòu)所能承受最大疲勞載荷時(shí)的車流量做了預(yù)測(cè)。具體來(lái)講，在此過程中所做工作包括如下幾方面： （1）對(duì)斜拉橋以及錨固結(jié)構(gòu)做了系統(tǒng)的介紹，并對(duì)鋼橋疲勞問題所研究的內(nèi)容、未來(lái)的發(fā)展方向做了詳細(xì)闡述。另外，介紹了名義應(yīng)力法、斷裂力學(xué)方法和疲勞可靠性方法三種結(jié)構(gòu)疲勞壽命評(píng)估的方法，對(duì)兩種累積損傷理論進(jìn)行比較分析，結(jié)合鋼橋疲勞問題的分析方法確定了本文所研究鋼錨箱的疲勞壽命評(píng)估的方法和主要步驟。 （2）整理WIM采集的三個(gè)具有代表性月份的車輛軸重及軸距信息，根據(jù)汽車相關(guān)手冊(cè)和車輛分類標(biāo)準(zhǔn)對(duì)通過大橋的所有車輛進(jìn)行分類，，根據(jù)等效軸重和等效軸距公式對(duì)每一類車輛載荷等效處理得到整橋模型的載荷，對(duì)整橋模型分步加載之后提取本文所分析的鋼錨箱所對(duì)應(yīng)的拉索的索力變化歷程。 （3）分別建立索梁和索塔錨固區(qū)鋼錨箱的ANSYS模型，加載索力的設(shè)計(jì)值和多倍值對(duì)其進(jìn)行靜力計(jì)算分析。根據(jù)鋼錨箱的整體應(yīng)力云圖和單獨(dú)板件的應(yīng)力云圖確定應(yīng)力集中部位和易發(fā)生疲勞破壞的位置。 （4）分別計(jì)算不同軸型的汽車加載時(shí)鋼錨箱的應(yīng)力變化歷程，采用雨流計(jì)數(shù)法建立疲勞細(xì)節(jié)的應(yīng)力譜，參考BS5400確定疲勞細(xì)節(jié)的S-N曲線，結(jié)合線性累積損傷準(zhǔn)則公式計(jì)算鋼錨箱的疲勞壽命，并對(duì)該結(jié)果做出分析和說(shuō)明。根據(jù)計(jì)算所用車流量和疲勞壽命預(yù)測(cè)值估算鋼錨箱發(fā)生破壞前大橋可以通車的車流總量。
[Abstract]:Based on the vehicle information data collected by the dynamic weighing system of Shanghai Yangtze River Tunnel, this paper takes the steel anchor box in the cable beam and cable tower Anchorage area as the research object, and uses the nominal stress method to evaluate its fatigue life. The traffic flow is predicted when the structure can withstand the maximum fatigue load. Specifically, the work done in this process includes the following aspects: 1) the cable-stayed bridge and anchoring structure are introduced systematically, and the research contents and future development direction of steel bridge fatigue are described in detail. In addition, nominal stress method is introduced. Fracture mechanics method and fatigue reliability method are used to evaluate the fatigue life of structures. The two cumulative damage theories are compared and analyzed. Combined with the analysis method of steel bridge fatigue problem, the method and main steps of fatigue life evaluation of steel anchor box studied in this paper are determined. (2) sorting out the information of vehicle axle load and wheelbase collected by WIM in three representative months, and classifying all vehicles passing through the bridge according to the vehicle related manual and vehicle classification standard. According to the equivalent axle load and the equivalent wheelbase formula, the load of the whole bridge model is obtained by the equivalent treatment of each kind of vehicle load. After the whole bridge model is loaded step by step, the cable force change history of the steel anchor box is extracted. (3) the ANSYS model of steel anchor box in cable beam and cable tower Anchorage zone is established respectively. The static calculation and analysis of the design value and multi-fold value of the loading cable force are carried out. According to the integral stress cloud diagram of the steel anchor box and the stress cloud diagram of the individual plate, the stress concentration position and the position where fatigue failure is easy to occur are determined. (4) the stress variation history of steel anchor box under different axle loading is calculated, the stress spectrum of fatigue details is established by rain flow counting method, and the S-N curve of fatigue detail is determined by referring to BS5400. The fatigue life of steel anchor box is calculated with linear cumulative damage criterion formula. According to the calculated vehicle flow and fatigue life prediction value, the total traffic volume of the bridge can be opened to traffic before the failure of the steel anchor box.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U448.27;U441.4

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