發(fā)布時(shí)間：2018-03-24 21:16

  本文選題：中小跨徑橋梁　切入點(diǎn)：重載交通　出處：《長安大學(xué)》2015年碩士論文

【摘要】：重載卡車數(shù)量的增長及其運(yùn)載能力的提高為超載運(yùn)輸?shù)男纬�、發(fā)展提供了萌發(fā)與生長的溫床,公路橋梁結(jié)構(gòu)的運(yùn)營安全也由此不斷遭受考驗(yàn)。據(jù)統(tǒng)計(jì),由車輛超載運(yùn)輸所造成的橋梁垮塌事件約占總量的27%,已經(jīng)成為僅次于結(jié)構(gòu)施工的第二大橋梁垮塌事件誘導(dǎo)因素。截止2013年底,在我國已建成的公路橋梁中,中小跨徑橋梁約占據(jù)其中的90%。本文基于104國道浙江紹興段、河北省宣大高速、滬陜高速上海段長期的交通流監(jiān)測(cè)數(shù)據(jù),以隨機(jī)車流橋梁耦合振動(dòng)分析系統(tǒng)(Bridge Dynamic ANalysis System)為計(jì)算平臺(tái),分析重載下典型空心板橋、簡支T梁橋、連續(xù)箱梁橋的響應(yīng)特征,并對(duì)其運(yùn)營安全性進(jìn)行評(píng)價(jià),最后基于實(shí)際監(jiān)測(cè)的交通流數(shù)據(jù),選擇公路運(yùn)輸中的常見重載卡車車型,研究中小跨徑橋梁對(duì)各車型的限載重量。主要研究內(nèi)容如下:1、基于104國道、宣大高速、滬陜高速長期動(dòng)態(tài)稱重(Weigh-in-Motion)數(shù)據(jù),對(duì)特重車荷載的車型組成、車質(zhì)量及車輛行駛位置分布特征等荷載參數(shù)進(jìn)行分析;2、建立中小跨徑橋梁梁格法有限元模型,并對(duì)模型的準(zhǔn)確性進(jìn)行驗(yàn)證,將所建立的有限元模型作為BDANS的橋梁結(jié)構(gòu)輸入信息,基于三個(gè)地區(qū)的WIM數(shù)據(jù)提取特重車荷載工況,計(jì)算特重車荷載工況作用下中小跨徑橋梁荷載效應(yīng),分析結(jié)構(gòu)的響應(yīng)特征;3、基于特重車荷載效應(yīng)的計(jì)算結(jié)果,對(duì)重載交通下中小跨徑橋梁內(nèi)力、位移超限情況,結(jié)構(gòu)的抗裂性能及承載能力安全性進(jìn)行分析評(píng)價(jià);4、選擇公路運(yùn)輸中的典型重載卡車車型為研究對(duì)象,基于結(jié)構(gòu)可靠度理論確定車輛限載的正彎矩效應(yīng)閾值,并計(jì)算了中小跨徑橋梁在不同目標(biāo)可靠指標(biāo)下對(duì)各車型的限載重量。
[Abstract]:The increase in the number of heavy-haul trucks and the improvement of their carrying capacity provide a breeding ground for the formation and development of overloaded transportation, and the safety of highway and bridge structures is constantly being tested. Bridge collapses caused by overloaded vehicles account for about 27% of the total number, which has become the second leading factor of bridge collapse after structural construction. By the end of 2013, among the highway bridges built in China, The medium and small span bridges account for about 90% of them. Based on the long-term traffic flow monitoring data of Shaoxing section of Zhejiang Province, Xuanda Expressway of Hebei Province and Shanghai section of Shanghai-Shaanxi Expressway, this paper takes the coupled vibration analysis system of random vehicle-flow bridge (Dynamic ANalysis system) as the computing platform. This paper analyzes the response characteristics of typical hollow slab bridge, simply supported T-beam bridge and continuous box girder bridge under heavy load, and evaluates its operation safety. Finally, based on the traffic flow data monitored in practice, the common heavy-duty truck models in highway transportation are selected. The main contents of this study are as follows: 1. Based on the data of 104 National Highway, XuanDa Expressway and Shanghai-Shaanxi Expressway, the model composition of the load of the super heavy vehicle is studied, which is based on the long-term dynamic weighing of Weigh-in-Motion. Based on the analysis of load parameters such as vehicle mass and vehicle driving position distribution, the finite element model of beam lattice method for medium and small span bridges is established, and the veracity of the model is verified. The established finite element model is used as the input information of BDANS bridge structure. Based on the WIM data of three regions, the load conditions of super heavy vehicles are extracted, and the load effects of medium and small span bridges under the load conditions of super heavy vehicles are calculated. The response characteristics of the structures are analyzed, and the calculation results based on the load effects of extra heavy vehicles are analyzed. This paper analyzes and evaluates the internal force and displacement of medium and small span bridges under heavy traffic, the anti-crack performance of the structure and the safety of bearing capacity, and selects the typical heavy-duty truck type in highway transportation as the research object. Based on the theory of structural reliability, the positive moment effect threshold of vehicle load limit is determined, and the load-limiting weight of medium and small span bridges for each type of vehicle is calculated under different target reliability indexes.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U441;U447

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