拱腳不等高鋼管混凝土拱橋受力性能研究及施工控制
發(fā)布時間：2018-12-30 17:26
【摘要】：近年來我國的交通基礎(chǔ)設(shè)施有了巨大改善，鋼管混凝土拱橋因其造型優(yōu)美、自重輕、受力合理等優(yōu)點從而在我國得到大力發(fā)展。長河壩水電站省道S211復(fù)建工程響水溝大橋是一座典型的拱腳不等高鋼管混凝土拱橋，拱肋、橫梁及空心板等采用無索塔纜索吊裝施工完成。本文以響水溝大橋為背景，對拱腳不等高鋼管混凝土拱橋進(jìn)行受力及無索塔纜索吊裝拱肋線形控制的相關(guān)問題的研究與分析： ①依據(jù)響水溝大橋的設(shè)計圖紙，利用有限元軟件MIDAS建立拱肋不同斜置角度的空間模型，分析了不同斜置角度下對鋼管混凝土拱橋軸力、彎矩、位移及穩(wěn)定性的影響，發(fā)現(xiàn)在恒載或活載作用下斜置角度對鋼管混凝土拱橋的軸力影響較小，且在從拱腳至拱頂影響比例逐漸減小，拱頂處軸力基本不變；對彎矩影響較大，尤其拱腳截面彎矩改變量最大，拱頂截面彎矩基本不變；對拱頂撓度基本沒有影響，而L/4和3L/4截面的撓度改變較大。 ②針對正拱斜置拱橋在恒載和活載等荷載作用下拱肋的變形特點，即拱肋位移呈現(xiàn)不對稱性，比較分析了不同預(yù)拱度設(shè)置方法的差異，提出以拱肋典型截面位置（L/8、L/4等）為撓度控制點進(jìn)行曲線擬合方法設(shè)置正拱斜置拱橋的預(yù)拱度，為拱肋預(yù)制提供參考。 ③本橋纜吊系統(tǒng)受橋位空間及地形條件影響，采用在兩岸修建后錨洞、錨梁代替龐大的索塔結(jié)構(gòu)，且采用單拱肋合攏技術(shù)。在拱肋安裝節(jié)段，拱肋標(biāo)高通過普通卷揚機(jī)對鋼絲繩扣索的收放來調(diào)整，在分析比較常用的索力計算和線形調(diào)整方法的優(yōu)缺點的基礎(chǔ)上，最終選取以裸拱變形為控制目標(biāo)，并以基于影響矩陣的定長扣索法進(jìn)行索力計算和優(yōu)化作為拱肋吊裝扣索的參考值，，拱肋線形以定長扣索法標(biāo)高控制原理為基礎(chǔ)，結(jié)合實際工程的特點，提出1#拱肋安裝時標(biāo)高在原有基礎(chǔ)上人為抬高5cm～10cm，后續(xù)拱肋節(jié)段按照定長扣索法原理計算，保證拱肋的相對坐標(biāo)不變，即保證相鄰拱肋節(jié)段拼裝無轉(zhuǎn)角。在合攏前進(jìn)行調(diào)整扣索長度，使各控制點位于拱肋控制線形上。 ④吊桿索力的控制將直接影響主梁的幾何線型、內(nèi)力分布等，針對常用的振動頻率法測試索力法，對影響索力測試的影響因素進(jìn)行了分析。根據(jù)本橋吊桿的實測頻率，對不同振動模型的實用計算公式索力計算結(jié)果進(jìn)行了對比分析，在此基礎(chǔ)上推導(dǎo)出考慮邊界條件、抗彎剛度等因素的實用計算公式，并以該橋成橋吊桿和鄭州黃河二橋吊桿的實測頻率進(jìn)行實用公式驗算。
[Abstract]:In recent years, the transportation infrastructure of our country has been greatly improved, and the concrete-filled steel tubular arch bridge has been greatly developed in our country because of its beautiful shape, light weight, reasonable force and so on. Xiangshuigou Bridge, a typical concrete filled steel tube arch bridge with different arches, is constructed by cable hoisting without cable tower, such as arch rib, beam and hollow slab. Taking Xiangshuigou Bridge as the background, this paper studies and analyzes the problems related to the stress of the arch bridge with unequal height of concrete filled steel tube and the control of the shape of the arch rib of cable hoisting without cable tower: 1 according to the design drawings of Xiangshuigou Bridge, The spatial model of different oblique angles of arch rib is established by using finite element software MIDAS, and the influence of different oblique angles on axial force, bending moment, displacement and stability of CFST arch bridge is analyzed. It is found that the influence of oblique angle on the axial force of concrete-filled steel tubular arch bridge is small under dead or live load, and the influence ratio decreases gradually from arch foot to arch top, and the axial force at arch top is basically unchanged. It has great influence on bending moment, especially the moment change of arch foot section is the largest, the moment of arch top section is basically unchanged, and the deflection of arch top is not affected basically, but the deflection of L / 4 and 3L/4 section is changed greatly. 2 according to the deformation characteristics of arch rib under dead load and live load, that is, the displacement of arch rib presents asymmetry, the difference of different pre-arch degree setting methods is compared and analyzed, and the typical section position of arch rib (L / 8) is put forward. The method of curve fitting for deflection control points is used to set the precamber of the skew arch bridge, which provides a reference for the precast of arch rib. (3) the cable suspension system is affected by the space of the bridge and the topographic conditions. The anchor beam is used to replace the huge cable tower structure and the single arch rib closure technique is used to build the anchor hole on both sides of the bridge. In the section of arch rib installation, the elevation of arch rib is adjusted by the common hoist to adjust the wire rope buckle cable. On the basis of analyzing and comparing the advantages and disadvantages of the commonly used methods of cable force calculation and linear adjustment, the ultimate control target is the deformation of bare arch. The calculation and optimization of cable force of fixed length buckle method based on influence matrix are taken as the reference value of hoisting buckle cable of arch rib. The arch rib line shape is based on the principle of elevation control of fixed length buckle cable method and combined with the characteristics of practical engineering. It is proposed that the elevation of the arch rib is artificially elevated by 5 cm ~ 10 cm on the original basis, and the subsequent arch rib section is calculated according to the principle of fixed length buckling cable method to ensure that the relative coordinates of the arch rib remain unchanged, that is to say, to ensure that the adjacent arch rib section is assembled without turning angle. Adjust the length of the buckle cable before closing so that the control points are located on the arch rib control line. (4) the control of the cable force of the suspender will directly affect the geometry of the main beam and the distribution of the internal force. According to the commonly used vibration frequency method to test the cable force, the influence factors of the cable force test are analyzed. According to the measured frequency of the suspension rod of the bridge, the practical calculation formula of cable force for different vibration models is compared and analyzed. On this basis, the practical calculation formula considering the boundary condition and bending stiffness is deduced. The practical formulas are checked with the measured frequency of the suspension rod of the bridge and Zhengzhou Yellow River Bridge.
【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】：U448.22;U441
本文編號：2395896
[Abstract]:In recent years, the transportation infrastructure of our country has been greatly improved, and the concrete-filled steel tubular arch bridge has been greatly developed in our country because of its beautiful shape, light weight, reasonable force and so on. Xiangshuigou Bridge, a typical concrete filled steel tube arch bridge with different arches, is constructed by cable hoisting without cable tower, such as arch rib, beam and hollow slab. Taking Xiangshuigou Bridge as the background, this paper studies and analyzes the problems related to the stress of the arch bridge with unequal height of concrete filled steel tube and the control of the shape of the arch rib of cable hoisting without cable tower: 1 according to the design drawings of Xiangshuigou Bridge, The spatial model of different oblique angles of arch rib is established by using finite element software MIDAS, and the influence of different oblique angles on axial force, bending moment, displacement and stability of CFST arch bridge is analyzed. It is found that the influence of oblique angle on the axial force of concrete-filled steel tubular arch bridge is small under dead or live load, and the influence ratio decreases gradually from arch foot to arch top, and the axial force at arch top is basically unchanged. It has great influence on bending moment, especially the moment change of arch foot section is the largest, the moment of arch top section is basically unchanged, and the deflection of arch top is not affected basically, but the deflection of L / 4 and 3L/4 section is changed greatly. 2 according to the deformation characteristics of arch rib under dead load and live load, that is, the displacement of arch rib presents asymmetry, the difference of different pre-arch degree setting methods is compared and analyzed, and the typical section position of arch rib (L / 8) is put forward. The method of curve fitting for deflection control points is used to set the precamber of the skew arch bridge, which provides a reference for the precast of arch rib. (3) the cable suspension system is affected by the space of the bridge and the topographic conditions. The anchor beam is used to replace the huge cable tower structure and the single arch rib closure technique is used to build the anchor hole on both sides of the bridge. In the section of arch rib installation, the elevation of arch rib is adjusted by the common hoist to adjust the wire rope buckle cable. On the basis of analyzing and comparing the advantages and disadvantages of the commonly used methods of cable force calculation and linear adjustment, the ultimate control target is the deformation of bare arch. The calculation and optimization of cable force of fixed length buckle method based on influence matrix are taken as the reference value of hoisting buckle cable of arch rib. The arch rib line shape is based on the principle of elevation control of fixed length buckle cable method and combined with the characteristics of practical engineering. It is proposed that the elevation of the arch rib is artificially elevated by 5 cm ~ 10 cm on the original basis, and the subsequent arch rib section is calculated according to the principle of fixed length buckling cable method to ensure that the relative coordinates of the arch rib remain unchanged, that is to say, to ensure that the adjacent arch rib section is assembled without turning angle. Adjust the length of the buckle cable before closing so that the control points are located on the arch rib control line. (4) the control of the cable force of the suspender will directly affect the geometry of the main beam and the distribution of the internal force. According to the commonly used vibration frequency method to test the cable force, the influence factors of the cable force test are analyzed. According to the measured frequency of the suspension rod of the bridge, the practical calculation formula of cable force for different vibration models is compared and analyzed. On this basis, the practical calculation formula considering the boundary condition and bending stiffness is deduced. The practical formulas are checked with the measured frequency of the suspension rod of the bridge and Zhengzhou Yellow River Bridge.
【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】：U448.22;U441
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