高速铁路中承式梁拱组合桥受力性能及徐变随机灵敏度分析
发布时间：2018-07-25 21:09
【摘要】：中承式梁拱组合桥通过主拱肋对梁体的加强作用,大幅提高了桥梁的整体刚度,并且主纵梁与主拱肋固结,使桥面系与主拱肋形成一个整体共同受力,可以适应高速铁路对桥梁结构横向刚度、竖向刚度、扭转刚度和桥面高平顺性的要求。中承式梁拱组合桥可以采用悬拼、转体施工等多种施工方式,对线下车辆的正常通行影响较小,并且三跨飞燕式造型美观,特别适合在城市及周边等景观要求较高的桥位处修建。当前有关中承式梁拱组合桥的研究文献尚不多见,本文以某高速铁路中承式钢箱混凝土梁拱组合桥为工程背景,对中承式梁拱组合桥的结构体系开展了较为系统的研究,同时对钢管混凝土结构徐变随机灵敏度分析方法及应用开展了研究,主要成果如下：1、基于吊杆膜张力假定,建立中承式梁拱组合桥的简化力学模型,并根据变形协调条件和力法推导了中承式梁拱组合桥的内力和主拱肋、主纵梁跨中截面的竖向变形计算公式,并采用Matlab软件编制了计算程序；通过算例对比分析证明,该方法虽然由于膜张力假定导致一定的误差,但是计算精度较高,具有无需建模、参数修改方便、计算速度快的优点,可以适用于方案设计阶段的估算。2、基于本文编制的计算程序,分析了中承式梁拱组合桥拱梁刚度比、矢跨比、边主跨比和桥面高度比的合理取值范围；并依托某高速铁路中承式梁拱组合桥工程实际,分析了三种不同结构体系对中承式梁拱组合桥力学性能的影响。3、结合课题依托工程实际,设计并完成了中承式梁拱组合桥的拱梁固结区域模型荷载试验；拱梁固结区模型试验结果表明：在设计荷载作用下该区域处于良好的弹性工作状态,应力分布均匀,拱梁固结区传力路径明确,结构应力水平较低,但主拱肋内填混凝土存在局部应力集中现象。4、以广义徐变系数为基础,基于钢管混凝土变形协调条件,推导证明可以将核心混凝土的自由徐变应变量作为钢管混凝土徐变计算的基本变量,提出等效温度荷载法计算钢管混凝土徐变；并基于有限元软件,采用等效温度荷载法,将修正后的3种典型的混凝土徐变系数模型用于长期轴压荷载作用下钢管混凝土构件的徐变性能分析。该方法只需对核心混凝土施加等效温度荷载,简化了钢管混凝土构件的徐变计算分析过程,通过与钢管混凝土徐变模型试验实测结果对比,验证了该方法的可行性。5、通过对普通粒子群算法的改进,提出了自适应混合粒子群算法,并对多个高维多峰函数进行寻优分析,证明该方法具有良好鲁棒性和搜索寻优精度。将自适应混合粒子群算法引入支持向量机参数的优化训练中,利用具有良好小样本学习能力的支持向量机回归拟合钢管混凝土徐变效应的显式函数,计算随机变量的灵敏度系数,并结合蒙特卡洛法进行随机性分析。通过对两个钢管混凝土轴压模型试验进行徐变随机灵敏度分析,验证了该方法在钢管混凝土徐变随机性分析中应用的可行性和准确性,同时分析了各随机变量对钢管混凝土结构徐变效应的敏感性。6、基于等效温度荷载法,推导了弯压荷载作用下矩形截面钢管混凝土结构徐变效应计算的温度梯度荷载计算公式,并应用于中承式钢箱混凝土梁拱组合桥徐变效应分析中。采用基于支持向量机和蒙特卡洛法,对某中承式钢箱混凝土梁拱组合桥拱顶、固结区、拱脚位置处钢箱和内填混凝土内力、应力,以及跨中截面位移增量的徐变效应进行随机性分析,并分析了各随机变量对中承式钢箱混凝土梁拱组合桥徐变效应的敏感性。
[Abstract]:Through the strengthening effect of the main arch rib to the beam body, the middle bearing type beam arch combination bridge greatly improves the overall stiffness of the bridge, and the main longitudinal beam is consolidated with the main arch rib, making the bridge deck and the main arch rib form a whole common stress, which can adapt to the requirements of the bridge structure lateral stiffness, vertical stiffness, torsional rigidity and the high smoothness of the bridge surface. The combination bridge of mid bearing girder and arch can be used in a variety of construction methods, such as hanging spelling and turning construction, which have little influence on the normal traffic under the line, and the three span swallow style is beautiful, especially suitable for the construction of the bridge position at the high requirement of the city and the surrounding landscape. In a high speed railway, the bearing type steel box concrete beam arch composite bridge is the engineering background, the structure system of the middle bearing type beam arch composite bridge is systematically studied. At the same time, the stochastic sensitivity analysis method and application of the concrete filled steel tube structure are studied. The main achievements are as follows: 1, based on the assumption of the tension of the hanger membrane, the establishment of the mid bearing type is established. The simplified mechanical model of the composite bridge of beam and arch is introduced. According to the deformation coordination condition and force method, the calculation formula of the vertical deformation of the middle span beam arch combined bridge is derived, and the calculation program of the vertical deformation of the middle section of the main longitudinal beam is obtained. The calculation program is compiled with Matlab software. The accuracy of the calculation is high, but it has the advantages of no modeling, convenient parameter modification and fast calculation. It can be applied to the estimated.2 in the design phase of the scheme. Based on the program compiled in this paper, the reasonable range of the stiffness ratio, the span ratio, the side main span ratio and the height ratio of the bridge surface are analyzed. The effect of three different structural systems on the mechanical properties of the mid bearing beam arch combined bridge is analyzed by three different structural systems in a high speed railway. Based on the project, the load test of the consolidation zone model of the arch beam of the middle bearing beam arch combined bridge is designed and completed. The results of the arch beam consolidation zone model test show that: Under the design load, the region is in good elastic working state, the stress distribution is uniform, the force path of the arch beam consolidation area is clear and the stress level is low, but the local stress concentration in the main arch rib is.4, based on the generalized creep coefficient, based on the deformation coordination conditions of steel pipe concrete, it is proved that the core can be the core. The free creep strain of the concrete is the basic variable of the creep calculation of the concrete filled steel tube, and the equivalent temperature load method is proposed to calculate the creep of the concrete filled steel tube. Based on the finite element software, the equivalent temperature load method is adopted to apply the modified 3 typical concrete creep modulus model to the concrete filled steel tube under the long-term axial load. This method only needs to apply the equivalent temperature load to the core concrete, simplifies the calculation and analysis process of the creep of the concrete filled steel tube. By comparing with the test results of the concrete filled steel tube creep model test, the feasibility of the method.5 is verified. By improving the ordinary particle swarm optimization, the adaptive mixing is put forward. The hybrid particle swarm optimization (PSO) algorithm is used to optimize and analyze a number of high dimensional peak functions. It is proved that the method has good robustness and search optimization accuracy. The adaptive hybrid particle swarm optimization is introduced into the optimization training of support vector machine parameters, and the support vector machine with good small sample learning ability is used to regress the concrete filled steel tube Xu Bianxiao The sensitivity coefficients of the random variables are calculated and the random analysis is carried out with Monte Carlo method. The random sensitivity analysis of two concrete filled steel tubular model tests is carried out to verify the feasibility and accuracy of the method in the stochastic analysis of concrete filled steel tube creep. The sensitivity of variable to the creep effect of concrete filled steel tube structure is.6. Based on the equivalent temperature load method, the calculation formula of temperature gradient load for the calculation of the creep effect of rectangular section concrete filled steel tube structure under the action of bending load is derived, and applied to the analysis of the creep effect of the medium bearing steel box concrete beam arch combined bridge. The mechanical and Monte Carlo method is used to analyze the randomness of the internal force, stress, and creep effect of the cross section displacement increment, and the sensitivity of the random variables to the creep effect of the medium bearing steel box concrete beam arch combined bridge is analyzed.
【学位授予单位】：西南交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U441
本文编号：2145094
[Abstract]:Through the strengthening effect of the main arch rib to the beam body, the middle bearing type beam arch combination bridge greatly improves the overall stiffness of the bridge, and the main longitudinal beam is consolidated with the main arch rib, making the bridge deck and the main arch rib form a whole common stress, which can adapt to the requirements of the bridge structure lateral stiffness, vertical stiffness, torsional rigidity and the high smoothness of the bridge surface. The combination bridge of mid bearing girder and arch can be used in a variety of construction methods, such as hanging spelling and turning construction, which have little influence on the normal traffic under the line, and the three span swallow style is beautiful, especially suitable for the construction of the bridge position at the high requirement of the city and the surrounding landscape. In a high speed railway, the bearing type steel box concrete beam arch composite bridge is the engineering background, the structure system of the middle bearing type beam arch composite bridge is systematically studied. At the same time, the stochastic sensitivity analysis method and application of the concrete filled steel tube structure are studied. The main achievements are as follows: 1, based on the assumption of the tension of the hanger membrane, the establishment of the mid bearing type is established. The simplified mechanical model of the composite bridge of beam and arch is introduced. According to the deformation coordination condition and force method, the calculation formula of the vertical deformation of the middle span beam arch combined bridge is derived, and the calculation program of the vertical deformation of the middle section of the main longitudinal beam is obtained. The calculation program is compiled with Matlab software. The accuracy of the calculation is high, but it has the advantages of no modeling, convenient parameter modification and fast calculation. It can be applied to the estimated.2 in the design phase of the scheme. Based on the program compiled in this paper, the reasonable range of the stiffness ratio, the span ratio, the side main span ratio and the height ratio of the bridge surface are analyzed. The effect of three different structural systems on the mechanical properties of the mid bearing beam arch combined bridge is analyzed by three different structural systems in a high speed railway. Based on the project, the load test of the consolidation zone model of the arch beam of the middle bearing beam arch combined bridge is designed and completed. The results of the arch beam consolidation zone model test show that: Under the design load, the region is in good elastic working state, the stress distribution is uniform, the force path of the arch beam consolidation area is clear and the stress level is low, but the local stress concentration in the main arch rib is.4, based on the generalized creep coefficient, based on the deformation coordination conditions of steel pipe concrete, it is proved that the core can be the core. The free creep strain of the concrete is the basic variable of the creep calculation of the concrete filled steel tube, and the equivalent temperature load method is proposed to calculate the creep of the concrete filled steel tube. Based on the finite element software, the equivalent temperature load method is adopted to apply the modified 3 typical concrete creep modulus model to the concrete filled steel tube under the long-term axial load. This method only needs to apply the equivalent temperature load to the core concrete, simplifies the calculation and analysis process of the creep of the concrete filled steel tube. By comparing with the test results of the concrete filled steel tube creep model test, the feasibility of the method.5 is verified. By improving the ordinary particle swarm optimization, the adaptive mixing is put forward. The hybrid particle swarm optimization (PSO) algorithm is used to optimize and analyze a number of high dimensional peak functions. It is proved that the method has good robustness and search optimization accuracy. The adaptive hybrid particle swarm optimization is introduced into the optimization training of support vector machine parameters, and the support vector machine with good small sample learning ability is used to regress the concrete filled steel tube Xu Bianxiao The sensitivity coefficients of the random variables are calculated and the random analysis is carried out with Monte Carlo method. The random sensitivity analysis of two concrete filled steel tubular model tests is carried out to verify the feasibility and accuracy of the method in the stochastic analysis of concrete filled steel tube creep. The sensitivity of variable to the creep effect of concrete filled steel tube structure is.6. Based on the equivalent temperature load method, the calculation formula of temperature gradient load for the calculation of the creep effect of rectangular section concrete filled steel tube structure under the action of bending load is derived, and applied to the analysis of the creep effect of the medium bearing steel box concrete beam arch combined bridge. The mechanical and Monte Carlo method is used to analyze the randomness of the internal force, stress, and creep effect of the cross section displacement increment, and the sensitivity of the random variables to the creep effect of the medium bearing steel box concrete beam arch combined bridge is analyzed.
【学位授予单位】：西南交通大学
【学位级别】：博士
【学位授予年份】：2014
【分类号】：U441
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