高填土作用下橋墩損傷機(jī)理與橋梁安全性能研究
發(fā)布時間：2018-08-25 07:48
【摘要】：在山區(qū)或重丘區(qū)修建橋梁時,溝谷地形十分常見,建設(shè)單位和施工單位為了節(jié)省成本,并考慮環(huán)保的原則,常常把橋下深溝作為路基的棄土場。這些回填土對橋墩一側(cè)產(chǎn)生不平衡土壓力,可能產(chǎn)生較大的側(cè)向變形。造成橋墩偏位、產(chǎn)生裂縫,情況嚴(yán)重的橋墩將會被推倒。在實際工程中橋墩周圍棄土現(xiàn)象十分常見,這些填土勢必會對橋墩產(chǎn)生影響,造成橋墩嚴(yán)重偏位,開裂等現(xiàn)象。一般情況下,土體的不穩(wěn)定狀態(tài)引起的土體的側(cè)移比土體的豎向沉降位移更為重要,尤其對于混凝土橋墩,因為在設(shè)計時,并未考慮橋墩承受水平荷載的能力,所以研究填土作用下橋墩的損傷機(jī)理,及其對全橋安全性能的影響是十分必要的。 本文首先對填土側(cè)移作用下橋墩樁的研究現(xiàn)狀進(jìn)行了總結(jié)和歸納,系統(tǒng)地介紹了土體側(cè)移引起橋墩樁的抗阻作用,闡述了國內(nèi)外一些有代表性的各種土壓力作用下樁基的理論、試驗及計算方法的成果。接著對有限元軟件ABAQUS處理接觸問題的理論進(jìn)行了介紹,結(jié)合工程實例對填土作用下橋墩建立模型,分析了橋墩的受力情況和位移情況,以及產(chǎn)生裂縫的位置分布。此外還進(jìn)一步研究了各種因素對橋墩受力的影響考慮了各種影響,如墩身幾何條件、土層性質(zhì)條件等等。 本文旨在建立和完善高填土作用下橋墩的損傷機(jī)理,以及對全橋安全性能的危害,研究的主要內(nèi)容包括以下幾個方面： ①研究不均勻、后期高填土作用下橋墩的三維有限元模型如何建立。 ②依托實際工程,建立橋墩與填土的有限元模型,分析橋墩在高填土作用下的受力和變形特點,研究橋墩裂縫出現(xiàn)的原因,分析橋墩、樁基和承臺的損傷機(jī)理,并結(jié)合實際觀測的橋墩偏位情況,對有限元分析的結(jié)果進(jìn)行驗證。 ③利用有限元模型,分析高填土作用下單墩變形和受力的影響因素,如土體的容重、彈性模量、泊松比、內(nèi)摩擦角和粘聚力；橋墩的彈性模量、直徑及原地形坡度等對橋墩受力和變形的影響,分析各個因素對實際工程的意義。 ④建立全橋有限元模型,結(jié)合橋梁的病害,分析填土作用下橋墩偏移對全橋安全性能的影響,并提出有針對性的病害處治方法。
[Abstract]:In order to save the cost and consider the principle of environmental protection, the deep ditch under the bridge is often regarded as the abandoned soil field of the roadbed when the bridge is built in the mountainous area or the heavy hill area, the valley topography is very common, in order to save the cost and consider the principle of environmental protection. The backfill can cause unbalanced earth pressure on one side of bridge pier, which may result in large lateral deformation. Causes the pier to deviate, produces the crack, the serious condition bridge pier will be pushed down. The phenomenon of abandoned soil around the bridge pier is very common in the practical engineering, which will inevitably affect the bridge pier, causing serious deviation of the pier, cracking and so on. In general, the lateral displacement of the soil caused by the unstable state of soil is more important than the vertical settlement displacement of the soil, especially for the concrete pier, because the capacity of the pier to withstand horizontal load is not considered in the design. Therefore, it is necessary to study the damage mechanism of bridge piers and its influence on the safety performance of the bridge. In this paper, firstly, the research status of pier pile under lateral displacement of fill soil is summarized and summarized. The resistance of pile caused by soil lateral displacement is systematically introduced, and some representative theories of pile foundation under various kinds of earth pressure at home and abroad are expounded. The results of test and calculation methods. Then the theory of the finite element software ABAQUS to deal with the contact problem is introduced, and the model of bridge pier under the action of filling soil is established, and the stress and displacement of the pier and the location distribution of cracks are analyzed. In addition, the influence of various factors on the bearing force of the pier is further studied, such as the geometrical conditions of the pier, the properties of the soil, and so on. The purpose of this paper is to establish and improve the damage mechanism of bridge piers under the action of high fill, as well as the harm to the safety performance of the whole bridge. The main contents of the research include the following aspects: 1. How to establish the three-dimensional finite element model of bridge pier under the action of high fill in the later stage. (2) based on the actual engineering, the finite element model of pier and fill is established, and the characteristics of force and deformation of pier under the action of high fill are analyzed. This paper studies the causes of pier cracks, analyzes the damage mechanism of pier, pile foundation and cap, and verifies the results of finite element analysis combined with the observed deflection of bridge pier. 3 using the finite element model, the damage mechanism of bridge pier, pile foundation and abutment is analyzed. This paper analyzes the factors affecting the deformation and force of the pier under the action of high fill, such as bulk density, elastic modulus, Poisson's ratio, angle of internal friction and cohesion, and the influence of the elastic modulus, diameter and original topographic slope of the pier on the force and deformation of the pier. This paper analyzes the significance of each factor to the actual project. 4. The finite element model of the whole bridge is established. Combined with the bridge disease, the influence of pier offset on the safety performance of the bridge under the action of fill is analyzed, and the corresponding treatment method is put forward.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U447;U443.22
本文編號：2202237
[Abstract]:In order to save the cost and consider the principle of environmental protection, the deep ditch under the bridge is often regarded as the abandoned soil field of the roadbed when the bridge is built in the mountainous area or the heavy hill area, the valley topography is very common, in order to save the cost and consider the principle of environmental protection. The backfill can cause unbalanced earth pressure on one side of bridge pier, which may result in large lateral deformation. Causes the pier to deviate, produces the crack, the serious condition bridge pier will be pushed down. The phenomenon of abandoned soil around the bridge pier is very common in the practical engineering, which will inevitably affect the bridge pier, causing serious deviation of the pier, cracking and so on. In general, the lateral displacement of the soil caused by the unstable state of soil is more important than the vertical settlement displacement of the soil, especially for the concrete pier, because the capacity of the pier to withstand horizontal load is not considered in the design. Therefore, it is necessary to study the damage mechanism of bridge piers and its influence on the safety performance of the bridge. In this paper, firstly, the research status of pier pile under lateral displacement of fill soil is summarized and summarized. The resistance of pile caused by soil lateral displacement is systematically introduced, and some representative theories of pile foundation under various kinds of earth pressure at home and abroad are expounded. The results of test and calculation methods. Then the theory of the finite element software ABAQUS to deal with the contact problem is introduced, and the model of bridge pier under the action of filling soil is established, and the stress and displacement of the pier and the location distribution of cracks are analyzed. In addition, the influence of various factors on the bearing force of the pier is further studied, such as the geometrical conditions of the pier, the properties of the soil, and so on. The purpose of this paper is to establish and improve the damage mechanism of bridge piers under the action of high fill, as well as the harm to the safety performance of the whole bridge. The main contents of the research include the following aspects: 1. How to establish the three-dimensional finite element model of bridge pier under the action of high fill in the later stage. (2) based on the actual engineering, the finite element model of pier and fill is established, and the characteristics of force and deformation of pier under the action of high fill are analyzed. This paper studies the causes of pier cracks, analyzes the damage mechanism of pier, pile foundation and cap, and verifies the results of finite element analysis combined with the observed deflection of bridge pier. 3 using the finite element model, the damage mechanism of bridge pier, pile foundation and abutment is analyzed. This paper analyzes the factors affecting the deformation and force of the pier under the action of high fill, such as bulk density, elastic modulus, Poisson's ratio, angle of internal friction and cohesion, and the influence of the elastic modulus, diameter and original topographic slope of the pier on the force and deformation of the pier. This paper analyzes the significance of each factor to the actual project. 4. The finite element model of the whole bridge is established. Combined with the bridge disease, the influence of pier offset on the safety performance of the bridge under the action of fill is analyzed, and the corresponding treatment method is put forward.
【學(xué)位授予單位】：重慶交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U447;U443.22
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