大跨徑鋼管混凝土拱橋易損性分析
發(fā)布時間：2018-10-23 11:46
【摘要】：吊桿斷裂導(dǎo)致的橋面塌落是目前鋼管混凝土拱橋面臨的主要病害。本文從吊桿斷裂作用和地震作用兩個角度對大跨徑鋼管混凝土拱橋易損性進行研究，基于拓撲易損性和地震易損性分析理論，采用靜力彈塑性和非線性增量動力分析方法，對不同吊桿斷裂狀況和不同地震強度下鋼管混凝土拱橋的易損性進行分析研究，并根據(jù)分析結(jié)果繪制了理論易損曲線，為大跨徑鋼管混凝土拱橋的設(shè)計施工提供指導(dǎo)。主要研究內(nèi)容如下： (1)基于鋼管混凝土拱橋主要病害的歸納分析，剖析了國內(nèi)外結(jié)構(gòu)易損性分析和吊桿斷裂方面的研究現(xiàn)狀，明確了大跨徑鋼管混凝土拱橋易損性分析亟需解決的問題、目的和意義。 (2)基于現(xiàn)有結(jié)構(gòu)易損性理論，探討鋼管混凝土拱橋易損性的分析方法。根據(jù)結(jié)構(gòu)拓撲易損性分析理論，分析了局部吊桿失效情況下，進行易損性評價的可行性；對比分析了采用可靠度理論與Pushover分析法建立結(jié)構(gòu)易損曲線和采用增量動力分析法建立結(jié)構(gòu)易損曲線的算法特征和適用場合，推薦了鋼管混凝土拱橋地震易損性分析的基本原則和方法。 (3)基于適合鋼管混凝土拱橋的易損性分析方法，提出了鋼管混凝土拱橋易損性分析流程，，對吊桿斷裂的沖擊作用和橋面板的延性性能進行了專門研究，確定以相鄰吊桿橫梁間的相對位移作為橋面板的易損指標(biāo)，提出了易損性判別準(zhǔn)則。 (4)根據(jù)拓撲易損性分析的方法，采用半動力的方法考慮吊桿的沖擊作用，在考慮恒載、二期荷載和斷裂沖擊力的作用下，通過對工程實例在不用吊桿斷裂組合下進行動力分析，探討了不同吊桿斷裂組合對橋面板的影響，并對基于吊桿斷裂的橋面板易損性進行了評價。 (5)針對工程實例，采用纖維模型考慮橋面板的材料非線性，選取合適的地震波，對計算模型進行非線性增量動力分析，通過對分析結(jié)果的進行線性擬合，建立理論易損性曲線，并對所得地震易損性曲線進行了對比分析。
[Abstract]:The collapse of deck caused by the rupture of suspenders is the main disease of CFST arch bridge at present. In this paper, the vulnerability of long-span concrete-filled steel tube arch bridge is studied from the angle of suspender fracture and seismic action. Based on the theory of topological vulnerability and seismic vulnerability, the static elastic-plastic and nonlinear incremental dynamic analysis methods are used. The vulnerability of concrete-filled steel tubular arch bridge under different suspenders and different earthquake intensity is analyzed and studied, and the theoretical vulnerable curve is drawn according to the analysis results, which provides guidance for the design and construction of long-span concrete-filled steel tube arch bridge. The main research contents are as follows: (1) based on the induction and analysis of the main diseases of concrete-filled steel tubular arch bridge, the research status of structural vulnerability analysis and suspender fracture at home and abroad is analyzed. The problems, purpose and significance of vulnerability analysis of long-span concrete-filled steel tubular arch bridge are defined. (2) based on the theory of structural vulnerability, the method of vulnerability analysis of concrete-filled steel tubular arch bridge is discussed. According to the theory of structural topology vulnerability analysis, the feasibility of vulnerability evaluation is analyzed under the failure of local suspenders. In this paper, the characteristics and application of reliability theory and Pushover method are compared to establish the structural vulnerability curve and incremental dynamic analysis method to establish the structural vulnerability curve. The basic principles and methods of seismic vulnerability analysis of CFST arch bridges are recommended. (3) based on the analysis methods suitable for CFST arch bridges, the flow chart of vulnerability analysis of CFST arch bridges is presented. The impact action of boom fracture and the ductility of bridge deck are studied specially, and the relative displacement between adjacent suspension beams is determined as the vulnerable index of bridge deck. The criterion of vulnerability is put forward. (4) according to the method of topological vulnerability analysis, the semi-dynamic method is adopted to consider the impact of the suspender, under the action of dead load, second stage load and fracture impact force. Based on the dynamic analysis of engineering examples without the combination of suspenders, this paper discusses the influence of different combination of suspenders on the bridge deck slab, and evaluates the vulnerability of the bridge deck slab based on the breakage of the suspenders. (5) aiming at the engineering examples, the paper makes an evaluation of the vulnerability of the bridge deck slab based on the breakage of the suspenders. The fiber model is used to consider the material nonlinearity of the deck slab and the appropriate seismic wave is selected. The nonlinear incremental dynamic analysis of the calculation model is carried out. The theoretical vulnerability curve is established by linear fitting of the analysis results. The seismic vulnerability curves obtained are compared and analyzed.
【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】：2014
【分類號】：U441.6;U448.22
本文編號：2289139
[Abstract]:The collapse of deck caused by the rupture of suspenders is the main disease of CFST arch bridge at present. In this paper, the vulnerability of long-span concrete-filled steel tube arch bridge is studied from the angle of suspender fracture and seismic action. Based on the theory of topological vulnerability and seismic vulnerability, the static elastic-plastic and nonlinear incremental dynamic analysis methods are used. The vulnerability of concrete-filled steel tubular arch bridge under different suspenders and different earthquake intensity is analyzed and studied, and the theoretical vulnerable curve is drawn according to the analysis results, which provides guidance for the design and construction of long-span concrete-filled steel tube arch bridge. The main research contents are as follows: (1) based on the induction and analysis of the main diseases of concrete-filled steel tubular arch bridge, the research status of structural vulnerability analysis and suspender fracture at home and abroad is analyzed. The problems, purpose and significance of vulnerability analysis of long-span concrete-filled steel tubular arch bridge are defined. (2) based on the theory of structural vulnerability, the method of vulnerability analysis of concrete-filled steel tubular arch bridge is discussed. According to the theory of structural topology vulnerability analysis, the feasibility of vulnerability evaluation is analyzed under the failure of local suspenders. In this paper, the characteristics and application of reliability theory and Pushover method are compared to establish the structural vulnerability curve and incremental dynamic analysis method to establish the structural vulnerability curve. The basic principles and methods of seismic vulnerability analysis of CFST arch bridges are recommended. (3) based on the analysis methods suitable for CFST arch bridges, the flow chart of vulnerability analysis of CFST arch bridges is presented. The impact action of boom fracture and the ductility of bridge deck are studied specially, and the relative displacement between adjacent suspension beams is determined as the vulnerable index of bridge deck. The criterion of vulnerability is put forward. (4) according to the method of topological vulnerability analysis, the semi-dynamic method is adopted to consider the impact of the suspender, under the action of dead load, second stage load and fracture impact force. Based on the dynamic analysis of engineering examples without the combination of suspenders, this paper discusses the influence of different combination of suspenders on the bridge deck slab, and evaluates the vulnerability of the bridge deck slab based on the breakage of the suspenders. (5) aiming at the engineering examples, the paper makes an evaluation of the vulnerability of the bridge deck slab based on the breakage of the suspenders. The fiber model is used to consider the material nonlinearity of the deck slab and the appropriate seismic wave is selected. The nonlinear incremental dynamic analysis of the calculation model is carried out. The theoretical vulnerability curve is established by linear fitting of the analysis results. The seismic vulnerability curves obtained are compared and analyzed.
【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】：2014
【分類號】：U441.6;U448.22
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