多塔空間索斜拉橋施工控制關(guān)鍵技術(shù)研究
發(fā)布時間：2018-09-08 14:54
【摘要】：多塔空間索斜拉橋以其結(jié)構(gòu)造型美觀、對通航、地形和地質(zhì)狀況適應(yīng)性強,抗扭和抗風(fēng)性能好等優(yōu)點越來越受到青睞。以往多塔空間索斜拉橋的研究主要集中在多塔斜拉橋的結(jié)構(gòu)體系、剛度提高措施和結(jié)構(gòu)設(shè)計等方面,而在其施工控制方面的研究相對較少,尚有不少問題值得深入研究和完善。本文主要以嘉紹大橋六塔空間索斜拉橋和馬鞍山長江公路大橋三塔空間索斜拉橋為背景,圍繞施工過程中無鋪裝層箱梁溫度場、合理施工狀態(tài)和合理成橋狀態(tài)確定、斜拉橋參數(shù)靈敏度分析與重要工序論證、空間四索面斜拉索索力橫向分配方案確定、箱梁剪力滯效應(yīng)、施工臨時荷載下鋼箱梁局部受力行為等施工控制方面的相關(guān)問題開展了-系列研究,主要工作與成果如下：(1)針對我國橋涵設(shè)計規(guī)范未給出無鋪裝層鋼箱梁、混凝土PK斷面梁日照溫度梯度和采用實測方法確定其溫度梯度工作量大的不足,通過杭州江東大橋鋼箱梁和馬鞍山大橋混凝土PK斷面梁豎向溫度場的數(shù)值計算和實橋測試,提出了無鋪裝層鋼箱梁和混凝土PK斷面梁的豎向溫度梯度。可推廣應(yīng)用于我國無鋪裝層鋼箱梁和混凝土PK斷面梁日照溫度場的確定。其中,無鋪裝層鋼箱梁豎向溫度梯度經(jīng)廣州東沙大橋鋼箱梁日照溫度場實測驗證。影響兩種主梁豎向日照溫度梯度因素的研究表明：太陽輻射吸收率對其影響較大,風(fēng)速對其影響相對較小。本文確定的豎向溫度梯度對無鋪裝層鋼箱梁應(yīng)力和線形的影響顯著。(2)針對目前斜拉橋合理狀態(tài)確定中先確定合理成橋狀態(tài)再確定合理施工狀態(tài)計算難以閉合或計算繁瑣且工作量大的問題,提出了確定斜拉橋合理施工狀態(tài)與成橋狀態(tài)的合二為—法。基本思路為：根據(jù)規(guī)范和設(shè)計確定的施工過程和成橋狀態(tài)下控制參數(shù)的容許范圍,綜合利用結(jié)構(gòu)自重恒載平衡法、結(jié)構(gòu)應(yīng)力和塔頂偏位控制法確定斜拉索初張力初值,利用正裝迭代法確定斜拉橋索初張力和調(diào)索索力,使橋梁各施工工況結(jié)構(gòu)內(nèi)力狀態(tài)均滿足規(guī)范和設(shè)計要求,使成橋后作用效應(yīng)組合應(yīng)力符合規(guī)范和設(shè)計要求且有一定的安全儲備。(3)針對用橫梁連成整體的雙幅主梁空間四索面斜拉橋索力橫向分配問題,根據(jù)力學(xué)基本原理,進行單幅主梁施工節(jié)段的橫橋向靜力分析,引入扭矩平衡條件,推導(dǎo)了四索面斜拉索初張拉和成橋狀態(tài)內(nèi)外側(cè)索力比值確定公式,提出了四索面斜拉橋索力橫向分配的零扭矩法�；诹闩ぞ胤ㄋ髁τ嬎愎酱_定的嘉紹大橋主梁施工過程和成橋狀態(tài)的內(nèi)外側(cè)索力比值差別不大,可按照所得的施工過程或成橋狀態(tài)內(nèi)外側(cè)斜拉索索力比值(任選其一)確定斜拉索初張力和調(diào)索索力內(nèi)外側(cè)索力比值。對內(nèi)外側(cè)索力比值的影響因素分析表明：在重量參數(shù)中鋼箱梁重量影響較大；在幾何參數(shù)中橋面吊機沿橫橋向至剪切中心水平距離影響較大。橋面吊機在縱橋向移動過程中應(yīng)盡量保持橫橋向位置不變和定位準確。(4)基于有限元的多塔空間索斜拉橋參數(shù)靈敏度分析表明：為滿足施工控制的需要,多塔鋼箱梁斜拉橋橋梁縱向主邊跨斜拉索的索力差、多塔混凝土箱梁斜拉橋箱梁板厚和橋面鋪裝厚度三項指標的施工精度和控制標準應(yīng)設(shè)置比橋涵規(guī)范更為嚴格�；谟邢拊墓ば蛘撟C計算表明：除了邊跨橋面吊機拆除時機可以在主梁施工過程中變動以外,其余工序均應(yīng)在主梁施工前確定,不宜臨時變化。(5)基于能量變分原理,綜合考慮箱梁橫截面正應(yīng)力軸向平衡條件和剪切變形的影響,構(gòu)建了包含參數(shù)m(即不同冪次)的新剪力滯翹曲位移函數(shù)。以所得應(yīng)力均方誤差與撓度均方誤差為精度標準,計算分析了不同m值拋物線下新構(gòu)建剪力滯翹曲位移函數(shù)的適應(yīng)性,得出了二次拋物線形式較為精確合理的結(jié)論。通過典型位置所得應(yīng)力值的比較,進一步分析了新構(gòu)建剪力滯翹曲位移函數(shù)(m=2)的適應(yīng)性和精確性。針對所得集中荷載作用下簡支箱梁翼緣懸臂板最外端應(yīng)力有較大偏差的情況,通過應(yīng)力曲線擬合,得到了集中荷載作用下簡支箱梁懸臂板的應(yīng)力改進公式。針對斜拉橋混凝土PK斷面梁,基于新構(gòu)建的剪力滯翹曲位移函數(shù)理論分析、實體單元有限元分析和實橋測試等的結(jié)果對比驗證了新構(gòu)建的剪力滯翹曲位移函數(shù)的適用性。(6)針對施工臨時荷載大于運營狀態(tài)下結(jié)構(gòu)設(shè)計荷載的實際情況,分析了橋面吊機等施工臨時荷載作用下的鋼箱梁力學(xué)響應(yīng),確定了鋼箱梁在臨時荷載作用下應(yīng)力較易超標和失穩(wěn)的工況,建議將大型臨時荷載納入橋涵設(shè)計通用規(guī)范所列“作用”,并重視進行其施工過程中的強度和穩(wěn)定性方面的驗算。
[Abstract]:Multi-pylon space cable-stayed bridges are more and more popular because of their beautiful structure, navigability, adaptability to topography and geological conditions, good torsion and wind resistance. Previous research on multi-pylon space cable-stayed bridges mainly focused on the structural system, stiffness improvement measures and structural design of multi-pylon cable-stayed bridges, but in its construction control. This paper mainly takes the six-pylon space cable-stayed bridge of Jiashao Bridge and the three-pylon space cable-stayed bridge of Maanshan Yangtze River Highway Bridge as the background, revolves around the temperature field of the box girder without pavement layer in the construction process, determines the reasonable construction state and the reasonable completion state, and determines the parameters of the cable-stayed bridge. Sensitivity analysis and demonstration of important procedures, determination of transverse cable force distribution scheme, shear lag effect of box girder, local stress behavior of steel box girder under temporary construction load and other construction control issues have been carried out - a series of studies, the main work and results are as follows: (1) China's bridge and culvert design code has not been given no laying. Through the numerical calculation of the vertical temperature field of the steel box girder of Hangzhou Jiangdong Bridge and the concrete PK section girder of Ma'anshan Bridge and the test of the actual bridge, the vertical temperature field of the steel box girder without pavement and the concrete PK section girder of the concrete PK section girder are proposed. Temperature gradient can be extended to determine the sunshine temperature field of steel box girder without pavement and PK section beam of concrete in China. The vertical temperature gradient of steel box girder without pavement is verified by the measured sunshine temperature field of steel box girder of Dongsha Bridge in Guangzhou. The vertical temperature gradient determined in this paper has a significant effect on the stress and alignment of steel box girder without pavement. (2) In order to solve the problem that it is difficult to close or complicated to calculate the reasonable construction state after determining the reasonable completion state of cable-stayed bridge at present, it is necessary to calculate the reasonable construction state. The basic idea is: according to the allowable range of the construction process and the control parameters of the completed bridge state determined by the code and design, the initial tension of the cable is determined by the structural dead weight and dead load balance method, the structural stress and the tower top deviation control method, and the normal installation method. The initial tension and cable force of cable-stayed bridge can be determined by iteration method, so that the internal force state of the bridge can meet the requirements of the code and design, so that the combined stress of Post-bridge action effect can meet the requirements of the code and design and has a certain safety reserve. (3) The transverse cable force of the cable-stayed bridge with two main girders and four cable planes connected as a whole by crossbeams is calculated. According to the basic mechanics principle, the lateral static analysis of single girder construction section is carried out, and the torque balance condition is introduced to deduce the formulas for determining the ratio of internal and external cable forces of four-plane cable-stayed cables under initial tension and completion state, and a zero torque method for the lateral distribution of cable forces of four-plane cable-stayed bridges is proposed. There is little difference between the ratio of inner and outer cable forces in the construction process of the main girder and the completed state of the Jiashao Bridge. The weight of the steel box girder has a great influence on the weight parameters, and the horizontal distance between the deck crane and the shear center has a great influence on the geometric parameters. To meet the requirements of construction control, the construction precision and control standard of three indices of longitudinal main side span cable-stayed cable-stayed bridge with multi-tower steel box girder, box girder slab thickness and deck pavement thickness of multi-tower concrete box girder cable-stayed bridge should be set more strictly than that of bridge and culvert code. The dismantling time of the face crane can be changed during the construction of the main girder, and the other working procedures should be determined before the construction of the main girder, so it is not suitable for temporary change. (5) Based on the energy variational principle, considering the axial equilibrium condition of the normal stress in the cross section of the box girder and the influence of shear deformation, a new shear lag warping displacement with parameter m (i.e. different power) is constructed. Taking the stress mean square error and deflection mean square error as the accuracy criterion, the adaptability of the new shear lag warping displacement function under different m-value parabola is calculated and analyzed, and the conclusion that the quadratic parabola is more accurate and reasonable is obtained. The adaptability and accuracy of the curved displacement function (m=2). In view of the large deviation of the stress at the outermost end of the flange cantilever plate of the simply supported box girder under concentrated load, the improved stress formula of the Simply Supported Box Girder Cantilever Plate under concentrated load is obtained by fitting the stress curve. The results of theoretical analysis of shear lag warping displacement function, finite element analysis of solid element and real bridge test verify the applicability of the new built shear lag warping displacement function. (6) In view of the actual situation that the temporary construction load is greater than the structural design load under the operation condition, the bridge deck crane and other temporary construction loads are analyzed. The mechanical response of steel box girder determines that the stress of steel box girder is easy to exceed the standard and destabilize under temporary load. It is suggested that large temporary load should be included in the "action" listed in the general code for bridge and culvert design, and the checking calculation of strength and stability during construction should be emphasized.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：U445.4;U448.27
本文編號：2230852
[Abstract]:Multi-pylon space cable-stayed bridges are more and more popular because of their beautiful structure, navigability, adaptability to topography and geological conditions, good torsion and wind resistance. Previous research on multi-pylon space cable-stayed bridges mainly focused on the structural system, stiffness improvement measures and structural design of multi-pylon cable-stayed bridges, but in its construction control. This paper mainly takes the six-pylon space cable-stayed bridge of Jiashao Bridge and the three-pylon space cable-stayed bridge of Maanshan Yangtze River Highway Bridge as the background, revolves around the temperature field of the box girder without pavement layer in the construction process, determines the reasonable construction state and the reasonable completion state, and determines the parameters of the cable-stayed bridge. Sensitivity analysis and demonstration of important procedures, determination of transverse cable force distribution scheme, shear lag effect of box girder, local stress behavior of steel box girder under temporary construction load and other construction control issues have been carried out - a series of studies, the main work and results are as follows: (1) China's bridge and culvert design code has not been given no laying. Through the numerical calculation of the vertical temperature field of the steel box girder of Hangzhou Jiangdong Bridge and the concrete PK section girder of Ma'anshan Bridge and the test of the actual bridge, the vertical temperature field of the steel box girder without pavement and the concrete PK section girder of the concrete PK section girder are proposed. Temperature gradient can be extended to determine the sunshine temperature field of steel box girder without pavement and PK section beam of concrete in China. The vertical temperature gradient of steel box girder without pavement is verified by the measured sunshine temperature field of steel box girder of Dongsha Bridge in Guangzhou. The vertical temperature gradient determined in this paper has a significant effect on the stress and alignment of steel box girder without pavement. (2) In order to solve the problem that it is difficult to close or complicated to calculate the reasonable construction state after determining the reasonable completion state of cable-stayed bridge at present, it is necessary to calculate the reasonable construction state. The basic idea is: according to the allowable range of the construction process and the control parameters of the completed bridge state determined by the code and design, the initial tension of the cable is determined by the structural dead weight and dead load balance method, the structural stress and the tower top deviation control method, and the normal installation method. The initial tension and cable force of cable-stayed bridge can be determined by iteration method, so that the internal force state of the bridge can meet the requirements of the code and design, so that the combined stress of Post-bridge action effect can meet the requirements of the code and design and has a certain safety reserve. (3) The transverse cable force of the cable-stayed bridge with two main girders and four cable planes connected as a whole by crossbeams is calculated. According to the basic mechanics principle, the lateral static analysis of single girder construction section is carried out, and the torque balance condition is introduced to deduce the formulas for determining the ratio of internal and external cable forces of four-plane cable-stayed cables under initial tension and completion state, and a zero torque method for the lateral distribution of cable forces of four-plane cable-stayed bridges is proposed. There is little difference between the ratio of inner and outer cable forces in the construction process of the main girder and the completed state of the Jiashao Bridge. The weight of the steel box girder has a great influence on the weight parameters, and the horizontal distance between the deck crane and the shear center has a great influence on the geometric parameters. To meet the requirements of construction control, the construction precision and control standard of three indices of longitudinal main side span cable-stayed cable-stayed bridge with multi-tower steel box girder, box girder slab thickness and deck pavement thickness of multi-tower concrete box girder cable-stayed bridge should be set more strictly than that of bridge and culvert code. The dismantling time of the face crane can be changed during the construction of the main girder, and the other working procedures should be determined before the construction of the main girder, so it is not suitable for temporary change. (5) Based on the energy variational principle, considering the axial equilibrium condition of the normal stress in the cross section of the box girder and the influence of shear deformation, a new shear lag warping displacement with parameter m (i.e. different power) is constructed. Taking the stress mean square error and deflection mean square error as the accuracy criterion, the adaptability of the new shear lag warping displacement function under different m-value parabola is calculated and analyzed, and the conclusion that the quadratic parabola is more accurate and reasonable is obtained. The adaptability and accuracy of the curved displacement function (m=2). In view of the large deviation of the stress at the outermost end of the flange cantilever plate of the simply supported box girder under concentrated load, the improved stress formula of the Simply Supported Box Girder Cantilever Plate under concentrated load is obtained by fitting the stress curve. The results of theoretical analysis of shear lag warping displacement function, finite element analysis of solid element and real bridge test verify the applicability of the new built shear lag warping displacement function. (6) In view of the actual situation that the temporary construction load is greater than the structural design load under the operation condition, the bridge deck crane and other temporary construction loads are analyzed. The mechanical response of steel box girder determines that the stress of steel box girder is easy to exceed the standard and destabilize under temporary load. It is suggested that large temporary load should be included in the "action" listed in the general code for bridge and culvert design, and the checking calculation of strength and stability during construction should be emphasized.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：博士
【學(xué)位授予年份】：2014
【分類號】：U445.4;U448.27
【引證文獻】
相關(guān)會議論文 前1條
1 陳家齊;顏全勝;;湛江海灣大橋施工中鋼箱梁溫度分布觀測與分析[A];第十三屆全國工程建設(shè)計算機應(yīng)用學(xué)術(shù)會議論文集[C];2006年
，本文編號：2230852
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