發(fā)布時(shí)間：2019-02-12 08:00

【摘要】：近年來(lái),為了滿足我國(guó)公路高速發(fā)展需求,橋梁建設(shè)領(lǐng)域采用梁場(chǎng)集中預(yù)制和運(yùn)架方式愈發(fā)普遍。雖然該施工工藝能較大程度縮短工期,但目前對(duì)其運(yùn)架梁安全性評(píng)估的理論研究較少,特別是在復(fù)雜地形條件下進(jìn)行梁板的運(yùn)輸與架設(shè)時(shí),安全事故頻有發(fā)生。本文以湖南省交通科技計(jì)劃項(xiàng)目“復(fù)雜地形條件下梁板運(yùn)輸與架設(shè)安全評(píng)估關(guān)鍵技術(shù)研究”(編號(hào)：201332)為依托,對(duì)復(fù)雜地形條件下梁板運(yùn)輸與架設(shè)進(jìn)行了安全評(píng)估,并提出了切實(shí)可行支護(hù)措施,并進(jìn)行了工程應(yīng)用。以湖南懷化繞城高速橋梁建設(shè)為背景,對(duì)預(yù)制梁板運(yùn)輸及架設(shè)施工過(guò)程安全性評(píng)估理論及應(yīng)用進(jìn)行了研究,主要研究?jī)?nèi)容如下：首先,通過(guò)大量的現(xiàn)場(chǎng)調(diào)研和資料查閱,初步分析了國(guó)內(nèi)外目前對(duì)該領(lǐng)域的研究現(xiàn)狀及水平,充分論證了該研究?jī)?nèi)容的必要性及重要性；其次,基于風(fēng)險(xiǎn)理論對(duì)運(yùn)架梁施工風(fēng)險(xiǎn)因素進(jìn)行識(shí)別,確定施工風(fēng)險(xiǎn)源,提取高危因素；再者,基于有限元理論,利用大型有限元軟件ANSYS對(duì)高危因素-裸梁上運(yùn)梁進(jìn)行仿真分析,獲得運(yùn)送過(guò)程中梁板的應(yīng)力應(yīng)變分布。進(jìn)行現(xiàn)場(chǎng)試驗(yàn),并與理論分析進(jìn)行對(duì)比,驗(yàn)證有限元理論在橋梁施工安全評(píng)估中的適用性,確保各種工況下梁板承載能力滿足規(guī)范要求；進(jìn)一步,基于可靠度理論對(duì)復(fù)雜地形條件下梁板運(yùn)輸與架設(shè)安全性進(jìn)行評(píng)估,通過(guò)對(duì)實(shí)際工程進(jìn)行現(xiàn)場(chǎng)調(diào)查和統(tǒng)計(jì),基于概率分析方法,得出結(jié)構(gòu)荷載和抗力概率模型,應(yīng)用失效概率方程求解運(yùn)、架梁過(guò)程的可靠度；最后,針對(duì)預(yù)制梁板運(yùn)輸與架設(shè)施工過(guò)程提出相應(yīng)防護(hù)措施。結(jié)果表明,風(fēng)險(xiǎn)因素分析理論可對(duì)運(yùn)架梁施工中風(fēng)險(xiǎn)源進(jìn)行有效識(shí)別�；诳煽啃岳碚�,結(jié)合有限元分析及試驗(yàn)研究,對(duì)高危因素進(jìn)行安全分析,確定失效概率,驗(yàn)證了該評(píng)估理論的可行性。結(jié)合工程實(shí)踐,對(duì)復(fù)雜地形條件下梁板運(yùn)輸與架設(shè)過(guò)程中的風(fēng)險(xiǎn)進(jìn)行分析,選取合適的施工荷載和結(jié)構(gòu)抗力,將確定性分析方法與概率分析方法相結(jié)合,對(duì)可能存在的安全隱患進(jìn)行安全性分析,根據(jù)理論計(jì)算和試驗(yàn)研究結(jié)果,改進(jìn)施工防護(hù)措施,取得了良好工程效益。
[Abstract]:In recent years, in order to meet the high speed development demand of highway in our country, it is more and more common in the field of bridge construction to use beam yard centralized prefabrication and transportation. Although the construction process can shorten the construction period to a large extent, there are few theoretical studies on the safety evaluation of the beam, especially when the beam and slab are transported and erected under the complex terrain, the safety accidents occur frequently. Based on Hunan Provincial Traffic Science and Technology Project "Research on key Technologies of Safety Evaluation of Beam and Plate Transportation and erection under complex terrain" (No. 201332), this paper evaluates the safety of beam-slab transportation and erection under complex terrain. The practical supporting measures are put forward, and the engineering application is carried out. Based on the construction of high speed bridge in Huaihua City, Hunan Province, the safety evaluation theory and application of prefabricated beam and slab transportation and erection construction process are studied. The main research contents are as follows: first, through a lot of field investigation and data reference, The present situation and level of research in this field at home and abroad are preliminarily analyzed, and the necessity and importance of the research content are fully demonstrated. Secondly, based on the risk theory, identify the construction risk factors, determine the construction risk source, extract the high-risk factors; Furthermore, based on the finite element theory, the large scale finite element software ANSYS is used to simulate and analyze the high risk factor, the upper transport beam of bare beam, and the stress and strain distribution of beam and slab during the transportation process is obtained. The field test is carried out and compared with the theoretical analysis to verify the applicability of the finite element theory in the safety assessment of bridge construction to ensure that the load-carrying capacity of beam and slab meets the requirements of the code under various working conditions. Furthermore, based on the reliability theory, the safety of beam and slab transportation and erection under complex terrain conditions is evaluated. The probabilistic model of structural load and resistance is obtained by on-the-spot investigation and statistics of actual engineering, based on probabilistic analysis method. Using the failure probability equation to solve the reliability of the operation and erection process; Finally, the corresponding protective measures are put forward for the transportation and erection of prefabricated beam and slab. The results show that the theory of risk factor analysis can identify the risk source effectively. Based on the reliability theory, combined with finite element analysis and experimental research, the safety analysis of high risk factors is carried out, and the failure probability is determined, which verifies the feasibility of the evaluation theory. Combined with engineering practice, this paper analyzes the risk of beam and slab transportation and erection under complex terrain conditions, selects appropriate construction load and structural resistance, and combines deterministic analysis method with probability analysis method. According to the theoretical calculation and experimental research results, the construction protection measures are improved and good engineering benefits are obtained.
【學(xué)位授予單位】：中南林業(yè)科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U445

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