多塔空间索斜拉桥施工控制关键技术研究
发布时间：2018-09-08 14:54
【摘要】：多塔空间索斜拉桥以其结构造型美观、对通航、地形和地质状况适应性强,抗扭和抗风性能好等优点越来越受到青睐。以往多塔空间索斜拉桥的研究主要集中在多塔斜拉桥的结构体系、刚度提高措施和结构设计等方面,而在其施工控制方面的研究相对较少,尚有不少问题值得深入研究和完善。本文主要以嘉绍大桥六塔空间索斜拉桥和马鞍山长江公路大桥三塔空间索斜拉桥为背景,围绕施工过程中无铺装层箱梁温度场、合理施工状态和合理成桥状态确定、斜拉桥参数灵敏度分析与重要工序论证、空间四索面斜拉索索力横向分配方案确定、箱梁剪力滞效应、施工临时荷载下钢箱梁局部受力行为等施工控制方面的相关问题开展了-系列研究,主要工作与成果如下：(1)针对我国桥涵设计规范未给出无铺装层钢箱梁、混凝土PK断面梁日照温度梯度和采用实测方法确定其温度梯度工作量大的不足,通过杭州江东大桥钢箱梁和马鞍山大桥混凝土PK断面梁竖向温度场的数值计算和实桥测试,提出了无铺装层钢箱梁和混凝土PK断面梁的竖向温度梯度。可推广应用于我国无铺装层钢箱梁和混凝土PK断面梁日照温度场的确定。其中,无铺装层钢箱梁竖向温度梯度经广州东沙大桥钢箱梁日照温度场实测验证。影响两种主梁竖向日照温度梯度因素的研究表明：太阳辐射吸收率对其影响较大,风速对其影响相对较小。本文确定的竖向温度梯度对无铺装层钢箱梁应力和线形的影响显著。(2)针对目前斜拉桥合理状态确定中先确定合理成桥状态再确定合理施工状态计算难以闭合或计算繁琐且工作量大的问题,提出了确定斜拉桥合理施工状态与成桥状态的合二为—法。基本思路为：根据规范和设计确定的施工过程和成桥状态下控制参数的容许范围,综合利用结构自重恒载平衡法、结构应力和塔顶偏位控制法确定斜拉索初张力初值,利用正装迭代法确定斜拉桥索初张力和调索索力,使桥梁各施工工况结构内力状态均满足规范和设计要求,使成桥后作用效应组合应力符合规范和设计要求且有一定的安全储备。(3)针对用横梁连成整体的双幅主梁空间四索面斜拉桥索力横向分配问题,根据力学基本原理,进行单幅主梁施工节段的横桥向静力分析,引入扭矩平衡条件,推导了四索面斜拉索初张拉和成桥状态内外侧索力比值确定公式,提出了四索面斜拉桥索力横向分配的零扭矩法。基于零扭矩法索力计算公式确定的嘉绍大桥主梁施工过程和成桥状态的内外侧索力比值差别不大,可按照所得的施工过程或成桥状态内外侧斜拉索索力比值(任选其一)确定斜拉索初张力和调索索力内外侧索力比值。对内外侧索力比值的影响因素分析表明：在重量参数中钢箱梁重量影响较大；在几何参数中桥面吊机沿横桥向至剪切中心水平距离影响较大。桥面吊机在纵桥向移动过程中应尽量保持横桥向位置不变和定位准确。(4)基于有限元的多塔空间索斜拉桥参数灵敏度分析表明：为满足施工控制的需要,多塔钢箱梁斜拉桥桥梁纵向主边跨斜拉索的索力差、多塔混凝土箱梁斜拉桥箱梁板厚和桥面铺装厚度三项指标的施工精度和控制标准应设置比桥涵规范更为严格。基于有限元的工序论证计算表明：除了边跨桥面吊机拆除时机可以在主梁施工过程中变动以外,其余工序均应在主梁施工前确定,不宜临时变化。(5)基于能量变分原理,综合考虑箱梁横截面正应力轴向平衡条件和剪切变形的影响,构建了包含参数m(即不同幂次)的新剪力滞翘曲位移函数。以所得应力均方误差与挠度均方误差为精度标准,计算分析了不同m值抛物线下新构建剪力滞翘曲位移函数的适应性,得出了二次抛物线形式较为精确合理的结论。通过典型位置所得应力值的比较,进一步分析了新构建剪力滞翘曲位移函数(m=2)的适应性和精确性。针对所得集中荷载作用下简支箱梁翼缘悬臂板最外端应力有较大偏差的情况,通过应力曲线拟合,得到了集中荷载作用下简支箱梁悬臂板的应力改进公式。针对斜拉桥混凝土PK断面梁,基于新构建的剪力滞翘曲位移函数理论分析、实体单元有限元分析和实桥测试等的结果对比验证了新构建的剪力滞翘曲位移函数的适用性。(6)针对施工临时荷载大于运营状态下结构设计荷载的实际情况,分析了桥面吊机等施工临时荷载作用下的钢箱梁力学响应,确定了钢箱梁在临时荷载作用下应力较易超标和失稳的工况,建议将大型临时荷载纳入桥涵设计通用规范所列“作用”,并重视进行其施工过程中的强度和稳定性方面的验算。
[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.
【学位授予单位】：长沙理工大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U445.4;U448.27
本文编号：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.
【学位授予单位】：长沙理工大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U445.4;U448.27
【引证文献】
相关会议论文 前1条
1 陈家齐;颜全胜;;湛江海湾大桥施工中钢箱梁温度分布观测与分析[A];第十三届全国工程建设计算机应用学术会议论文集[C];2006年
，本文编号：2230852
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