預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋裂縫分析及加固研究
發(fā)布時(shí)間：2019-06-25 20:01
【摘要】：預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋梁以其合理的受力和良好的行車性能在我國橋梁領(lǐng)域眾多橋型里占據(jù)數(shù)量上主導(dǎo)地位,對我國公路交通運(yùn)輸業(yè)發(fā)揮著極其重要的作用。大跨徑預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋具有較大的跨越能力和較強(qiáng)的適應(yīng)性的優(yōu)勢,廣泛應(yīng)用于我國高原山區(qū)。然而,由于其材料本身、環(huán)境因素以及載荷條件的變化,使得連續(xù)剛構(gòu)橋在運(yùn)營階段出現(xiàn)不同程度損傷。根據(jù)對現(xiàn)有預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋梁病害的調(diào)查分析,主要損傷病害為中跨撓度變形量過大和梁體不同部位裂縫,裂縫分布形式和分布位置對主梁截面的剛度也有一定的削弱作用,進(jìn)而促使橋梁下?lián)?故梁體裂縫和撓度之間息息相關(guān)的。本文以云南省大保高速公路一座預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋?yàn)橐劳泄こ�。首�?運(yùn)用有限元分析軟件Midas Civil對運(yùn)營階段引起裂縫產(chǎn)生的主要因素進(jìn)行分析,研究活荷載、預(yù)應(yīng)力收縮、溫度作用以及收縮徐變對橋梁結(jié)構(gòu)內(nèi)力和應(yīng)力的影響規(guī)律。其次,根據(jù)以上因素對內(nèi)力的影響規(guī)律,結(jié)合橋梁所在地的運(yùn)營環(huán)境和交通量,對橋梁實(shí)際運(yùn)營情況的受力狀態(tài)進(jìn)行近似模擬。再次,根據(jù)有限元理論分析結(jié)果并結(jié)合該橋梁外觀檢測報(bào)告,選取裂縫分布密集的梁段運(yùn)用有限元分析軟件ABAQUS建立有限元模型進(jìn)行細(xì)部分析,以梁塊最不利裂縫為基礎(chǔ)運(yùn)用混凝土斷裂力學(xué)知識計(jì)算梁段在外荷載作用下裂縫的斷裂力學(xué)參數(shù),定量分析裂縫的受力特性,定性的判斷裂縫的表現(xiàn)形式,進(jìn)而可以評估裂縫對橋梁結(jié)構(gòu)的影響,為橋梁加固提供依據(jù)。最后,結(jié)合依托工程分析以體外預(yù)應(yīng)力鋼束為例的主動(dòng)加固法,得出不同位置的體外預(yù)應(yīng)力鋼束對結(jié)構(gòu)承載力和裂縫控制的作用是不同的,進(jìn)而對加固效果性進(jìn)行評價(jià)。通過計(jì)算裂紋斷裂參數(shù)及其擴(kuò)展情況,計(jì)算橋梁結(jié)構(gòu)在使用荷載作用下結(jié)構(gòu)的損傷狀況,根據(jù)分析結(jié)果選擇適當(dāng)?shù)募庸谭椒?并對此橋提出加固方案建議,為橋梁結(jié)構(gòu)維修加固提供經(jīng)濟(jì)性與安全性的依據(jù)。
[Abstract]:Prestressed concrete continuous rigid frame bridge plays an important role in the highway transportation industry of our country because of its reasonable force and good driving performance, which occupies a dominant position in the number of bridges in the field of bridges in our country. Long-span prestressed concrete continuous rigid frame bridge has the advantages of great leapfrogging ability and strong adaptability, and is widely used in plateau mountainous areas of China. However, due to the change of material itself, environmental factors and load conditions, the continuous rigid frame bridge is damaged to varying degrees in the operation stage. According to the investigation and analysis of the existing prestressed concrete continuous rigid frame bridge diseases, the main damage diseases are excessive deflection deformation in the middle span and cracks in different parts of the beam body. The crack distribution form and distribution position also weaken the stiffness of the main beam section to a certain extent, and then promote the bridge deflection, so the crack and deflection of the beam body are closely related. This paper is based on a prestressed concrete continuous rigid frame bridge of Dabo Expressway in Yunnan Province. Firstly, the finite element analysis software Midas Civil is used to analyze the main factors causing cracks in the operation stage, and the effects of live load, prestressed shrinkage, temperature and shrinkage and creep on the internal force and stress of the bridge structure are studied. Secondly, according to the influence of the above factors on the internal force, combined with the operating environment and traffic volume of the bridge location, the stress state of the actual operation of the bridge is approximately simulated. Thirdly, according to the results of finite element theory analysis and combined with the appearance detection report of the bridge, the beam section with dense crack distribution is selected and the finite element analysis software ABAQUS is used to establish the finite element model for detailed analysis. Based on the most unfavorable cracks in the beam block, the fracture mechanical parameters of the beam section under external load are calculated by using the knowledge of concrete fracture mechanics, the stress characteristics of the cracks are quantitatively analyzed, and the manifestation of the cracks is judged qualitatively. Furthermore, the influence of cracks on bridge structure can be evaluated, which provides the basis for bridge reinforcement. Finally, based on the engineering analysis, taking the external prestressed steel bundles as an example, it is concluded that the external prestressed steel bundles in different positions have different effects on the bearing capacity and crack control of the structure, and then the reinforcement effect is evaluated. By calculating the crack fracture parameters and their propagation, the damage condition of the bridge structure under the action of service load is calculated, according to the analysis results, the appropriate reinforcement method is selected, and the reinforcement scheme of the bridge is put forward, which provides the economic and safety basis for the maintenance and reinforcement of the bridge structure.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.72;U448.23
本文編號：2505963
[Abstract]:Prestressed concrete continuous rigid frame bridge plays an important role in the highway transportation industry of our country because of its reasonable force and good driving performance, which occupies a dominant position in the number of bridges in the field of bridges in our country. Long-span prestressed concrete continuous rigid frame bridge has the advantages of great leapfrogging ability and strong adaptability, and is widely used in plateau mountainous areas of China. However, due to the change of material itself, environmental factors and load conditions, the continuous rigid frame bridge is damaged to varying degrees in the operation stage. According to the investigation and analysis of the existing prestressed concrete continuous rigid frame bridge diseases, the main damage diseases are excessive deflection deformation in the middle span and cracks in different parts of the beam body. The crack distribution form and distribution position also weaken the stiffness of the main beam section to a certain extent, and then promote the bridge deflection, so the crack and deflection of the beam body are closely related. This paper is based on a prestressed concrete continuous rigid frame bridge of Dabo Expressway in Yunnan Province. Firstly, the finite element analysis software Midas Civil is used to analyze the main factors causing cracks in the operation stage, and the effects of live load, prestressed shrinkage, temperature and shrinkage and creep on the internal force and stress of the bridge structure are studied. Secondly, according to the influence of the above factors on the internal force, combined with the operating environment and traffic volume of the bridge location, the stress state of the actual operation of the bridge is approximately simulated. Thirdly, according to the results of finite element theory analysis and combined with the appearance detection report of the bridge, the beam section with dense crack distribution is selected and the finite element analysis software ABAQUS is used to establish the finite element model for detailed analysis. Based on the most unfavorable cracks in the beam block, the fracture mechanical parameters of the beam section under external load are calculated by using the knowledge of concrete fracture mechanics, the stress characteristics of the cracks are quantitatively analyzed, and the manifestation of the cracks is judged qualitatively. Furthermore, the influence of cracks on bridge structure can be evaluated, which provides the basis for bridge reinforcement. Finally, based on the engineering analysis, taking the external prestressed steel bundles as an example, it is concluded that the external prestressed steel bundles in different positions have different effects on the bearing capacity and crack control of the structure, and then the reinforcement effect is evaluated. By calculating the crack fracture parameters and their propagation, the damage condition of the bridge structure under the action of service load is calculated, according to the analysis results, the appropriate reinforcement method is selected, and the reinforcement scheme of the bridge is put forward, which provides the economic and safety basis for the maintenance and reinforcement of the bridge structure.
【學(xué)位授予單位】：長安大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U445.72;U448.23
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，本文編號：2505963
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