本文關(guān)鍵詞：公路橋梁運(yùn)營安全監(jiān)測技術(shù)研究　出處：《華南理工大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 既有橋梁 運(yùn)營安全監(jiān)測 病害模擬 有限元法

【摘要】：隨著使用年限增長、環(huán)境條件變化、材料性質(zhì)退化、車輛超載和交通量劇增等因素影響，公路橋梁結(jié)構(gòu)性能都會(huì)經(jīng)歷一個(gè)逐漸衰減的過程，當(dāng)橋梁發(fā)生各種病害、構(gòu)件損傷或構(gòu)件局部破壞等情況時(shí)，則需要對(duì)此類橋梁進(jìn)行必要的運(yùn)營階段監(jiān)測，其目的在于保障橋梁安全運(yùn)營的前提下，并為下一步的結(jié)構(gòu)維修或加固提供決策依據(jù)。與新建橋梁施工監(jiān)控技術(shù)相比，對(duì)于服役年限較長且發(fā)生各種病害的橋梁進(jìn)行運(yùn)營階段的使用性能監(jiān)測，需要考慮的監(jiān)測內(nèi)容和對(duì)象都存在很大的不同，因此針對(duì)目前我國公路橋梁的現(xiàn)狀開展既有公路橋梁運(yùn)營階段的安全監(jiān)測技術(shù)研究具有一定的實(shí)際意義。 本文以廣東省內(nèi)三種典型形式的既有橋梁結(jié)構(gòu)為工程背景，，在橋梁病害和結(jié)構(gòu)現(xiàn)狀調(diào)查工作的基礎(chǔ)上，利用空間結(jié)構(gòu)有限元方法對(duì)橋梁結(jié)構(gòu)整體受力性能進(jìn)行了研究，制定了符合實(shí)際情況的橋梁運(yùn)營階段安全監(jiān)測技術(shù)方案和預(yù)警指標(biāo)閾值，從而為評(píng)估橋梁結(jié)構(gòu)狀況提供了可靠依據(jù)。本文主要研究內(nèi)容如下： （1）針對(duì)既有橋梁安全監(jiān)測的主要工作內(nèi)容、監(jiān)測設(shè)計(jì)原則、主要監(jiān)測技術(shù)和監(jiān)測系統(tǒng)涉及的傳感器網(wǎng)絡(luò)、橋梁結(jié)構(gòu)狀況的可靠性評(píng)估的研究現(xiàn)狀進(jìn)行了簡述。 （2）針對(duì)既有橋梁結(jié)構(gòu)有限元分析方法進(jìn)行了研究。針對(duì)混凝土橋梁構(gòu)件病害類型、形成原因及其危害程度進(jìn)行了分級(jí)和歸類，總結(jié)和歸納了混凝土收縮徐變特性的計(jì)算模型并進(jìn)行了對(duì)比分析，闡述了帶裂縫工作的混凝土構(gòu)件有限元分析模型和計(jì)算方法。 （3）以廣東省境內(nèi)三種典型公路橋梁結(jié)構(gòu)為工程背景，針對(duì)公路橋梁運(yùn)營監(jiān)測技術(shù)、既有橋梁運(yùn)營安全性分析方法及其實(shí)施進(jìn)行了研究。在對(duì)橋梁實(shí)際病害和構(gòu)件力學(xué)性能進(jìn)行詳細(xì)檢測的基礎(chǔ)上，建立了考慮橋梁現(xiàn)狀的三維有限元分析模型并采用MIDAS/FEA有限元分析軟件進(jìn)行了仿真分析，根據(jù)計(jì)算得到的結(jié)構(gòu)最不利荷載效應(yīng)分布規(guī)律和數(shù)值范圍，確定了運(yùn)營階段橋梁安全監(jiān)測的變形、受力控制部位和監(jiān)測傳感器的選型依據(jù)，從而為制定既有橋梁運(yùn)營階段監(jiān)測技術(shù)方案、確定橋梁健康狀況監(jiān)測預(yù)警指標(biāo)提供了科學(xué)依據(jù)。本文開展有監(jiān)測工作實(shí)踐驗(yàn)證了相關(guān)研究成果的有效性和合理性。
[Abstract]:With the increase of service life, the change of environmental conditions, the degradation of material properties, the overloading of vehicles and the increase of traffic volume, the structural performance of highway and bridge will undergo a process of gradual decay. When there are various diseases, component damage or local damage of the bridge, it is necessary to monitor the necessary operation stage of the bridge, the purpose of which is to ensure the safe operation of the bridge. Compared with the new bridge construction monitoring technology, it monitors the service performance of the bridges with long service life and various diseases. The monitoring contents and objects that need to be considered are very different, so it is of certain practical significance to study the safety monitoring technology of existing highway bridges in view of the present situation of highway bridges in China. Based on the engineering background of three typical forms of existing bridge structures in Guangdong Province, this paper is based on the investigation of bridge diseases and structures. The finite element method of spatial structure is used to study the overall mechanical performance of bridge structure, and the technical scheme of safety monitoring and the threshold value of early warning index are established according to the actual situation of the bridge operation phase. Thus it provides a reliable basis for the evaluation of bridge structure. The main contents of this paper are as follows: 1) aiming at the main work content of the existing bridge safety monitoring, the monitoring design principle, the main monitoring technology and the sensor network involved in the monitoring system. The research status of reliability assessment of bridge structure is briefly described. (2) the finite element analysis method of existing bridge structure is studied, and the causes and damage degree of concrete bridge member are classified and classified according to the type of disease of concrete bridge member. The calculation model of shrinkage and creep characteristics of concrete is summarized and compared. The finite element analysis model and calculation method of concrete members with cracks are expounded. Based on the engineering background of three typical highway bridge structures in Guangdong Province, this paper aims at the monitoring technology of highway bridge operation. The existing bridge operation safety analysis method and its implementation are studied. Based on the detailed detection of the actual bridge diseases and the mechanical properties of the components. The 3D finite element analysis model considering the current situation of bridge is established and the simulation analysis is carried out by using MIDAS/FEA finite element analysis software. According to the distribution law and numerical range of the most unfavorable load effect of the structure, the deformation of bridge safety monitoring, the force control position and the selection basis of the monitoring sensor are determined. Thus, it can be used to establish the monitoring technology scheme of the existing bridge operation stage. It provides a scientific basis to determine the monitoring and early warning index of bridge health condition. The effectiveness and rationality of the related research results are verified by the practice of monitoring in this paper.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U446

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