鲍家洲汉江特大桥施工控制分析
发布时间：2019-04-02 20:52
【摘要】：连续刚构桥施工具有节段较多和干扰因素复杂的特点,而且成桥之后很难进行调整,因此需要在施工过程中进行合理的施工控制,使得成桥运营后的结构状态满足设计要求。连续刚构桥的施工控制主要包括结构线形和应力控制,通过施工过程中对结构线形和应力的调整来达到对整体结构的有效控制。本文以鲍家洲汉江特大桥主桥为研究背景,结合桥梁设计资料与研究现状进行了连续刚构桥施工控制分析。建立主桥有限元分析模型,对各类设计参数进行敏感性分析得到:对主梁挠度影响较大的参数分别是混凝土容重、混凝土收缩徐变、预应力、温度梯度以及年温差,在参数变化范围内引起的挠度变化大于2mm;对主梁应力影响较大的参数分别是混凝土容重、混凝土收缩徐变、预应力以及温度梯度,在参数变化范围内引起的应力变化大于1 MPa。在此基础之上,提出了施工过程中针对各类敏感设计参数的控制措施,为主桥线形和应力监控提供理论依据。建立三角挂篮有限元分析模型,对主桥中使用的三角挂篮分别进行了结构强度验算、结构刚度验算、结构抗倾覆验算以及局部构件验算,验算结果表明该三角挂篮符合规范要求和施工需求。除此之外还进行了挂篮变形分析,在有限元建模计算、主桁架预压试验以及挂篮变形实测的基础上进行了挂篮理论变形值、试验变形值与实测变形值的比较分析,结果表明三者差值满足施工要求,证明了挂篮变形预测的合理性。依据主桥有限元分析模型,进行了主桥施工阶段分析计算和移动荷载分析计算,从应力和变形的角度验证了原桥梁设计的合理性,明确了主桥在移动荷载作用下的应力和变形状态。结合本桥特点提出预拱度的表达式,依据主桥计算模型分析得到各施工节段的预拱度值,以供立模标高之用。进行了主桥高程与应力监控数据分析,表明施工过程中结构线形和应力状态均能满足规范要求,进而证明该桥施工控制的合理性。
[Abstract]:The continuous rigid frame bridge construction has the characteristics of more segments and complex interference factors, and it is difficult to adjust after the bridge is completed. Therefore, it is necessary to carry out reasonable construction control in the construction process to make the structure state after the completion of the bridge meet the design requirements. The construction control of continuous rigid frame bridge mainly includes structural alignment and stress control. Through the adjustment of structural alignment and stress in the construction process, the overall structure can be effectively controlled. Taking the main bridge of Baojiazhou Hanjiang River Bridge as the research background, the construction control analysis of continuous rigid frame bridge is carried out in combination with the bridge design data and the present research situation. The finite element analysis model of the main bridge is established and the sensitivity analysis of various design parameters is carried out. The results show that the parameters which have great influence on the deflection of the main beam are concrete bulk density, concrete shrinkage and creep, prestress, temperature gradient and annual temperature difference, respectively. The deflection change caused by the variation of parameters is more than 2 mm; The parameters which have great influence on the stress of the main beam are concrete bulk density, concrete shrinkage and creep, prestress and temperature gradient. The variation of stress in the range of parameters is greater than 1 MPa.. On the basis of this, the control measures for all kinds of sensitive design parameters in the construction process are put forward, which provide the theoretical basis for the line shape and stress monitoring of the main bridge. The finite element analysis model of trigonometric hanging basket is established. The structural strength checking calculation, structural stiffness checking calculation, structural anti-overturning checking calculation and local component checking calculation are carried out respectively for the triangular hanging basket used in the main bridge. The checking result shows that the triangle hanging basket accords with the requirement of specification and construction. In addition, the deformation analysis of the hanging basket is carried out. On the basis of the finite element modeling calculation, the pre-loading test of the main truss and the measurement of the deformation of the hanging basket, the theoretical deformation value of the hanging basket, the comparison between the experimental deformation value and the measured deformation value are compared and analyzed. The results show that the difference among them meets the requirements of construction and proves the rationality of deformation prediction of hanging basket. According to the finite element analysis model of the main bridge, the analysis and calculation of the construction stage and the moving load of the main bridge are carried out. The rationality of the original bridge design is verified from the point of view of stress and deformation. The stress and deformation state of the main bridge under moving load is defined. According to the characteristics of the bridge, the expression of the pre-arch degree is put forward, and the pre-arch value of each construction segment is obtained according to the calculation model of the main bridge, which can be used for the elevation of the vertical formwork. Through the analysis of the height and stress monitoring data of the main bridge, it is shown that the structural alignment and stress state can meet the requirements of the code during the construction process, and the rationality of the construction control of the bridge is further proved.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4
[Abstract]:The continuous rigid frame bridge construction has the characteristics of more segments and complex interference factors, and it is difficult to adjust after the bridge is completed. Therefore, it is necessary to carry out reasonable construction control in the construction process to make the structure state after the completion of the bridge meet the design requirements. The construction control of continuous rigid frame bridge mainly includes structural alignment and stress control. Through the adjustment of structural alignment and stress in the construction process, the overall structure can be effectively controlled. Taking the main bridge of Baojiazhou Hanjiang River Bridge as the research background, the construction control analysis of continuous rigid frame bridge is carried out in combination with the bridge design data and the present research situation. The finite element analysis model of the main bridge is established and the sensitivity analysis of various design parameters is carried out. The results show that the parameters which have great influence on the deflection of the main beam are concrete bulk density, concrete shrinkage and creep, prestress, temperature gradient and annual temperature difference, respectively. The deflection change caused by the variation of parameters is more than 2 mm; The parameters which have great influence on the stress of the main beam are concrete bulk density, concrete shrinkage and creep, prestress and temperature gradient. The variation of stress in the range of parameters is greater than 1 MPa.. On the basis of this, the control measures for all kinds of sensitive design parameters in the construction process are put forward, which provide the theoretical basis for the line shape and stress monitoring of the main bridge. The finite element analysis model of trigonometric hanging basket is established. The structural strength checking calculation, structural stiffness checking calculation, structural anti-overturning checking calculation and local component checking calculation are carried out respectively for the triangular hanging basket used in the main bridge. The checking result shows that the triangle hanging basket accords with the requirement of specification and construction. In addition, the deformation analysis of the hanging basket is carried out. On the basis of the finite element modeling calculation, the pre-loading test of the main truss and the measurement of the deformation of the hanging basket, the theoretical deformation value of the hanging basket, the comparison between the experimental deformation value and the measured deformation value are compared and analyzed. The results show that the difference among them meets the requirements of construction and proves the rationality of deformation prediction of hanging basket. According to the finite element analysis model of the main bridge, the analysis and calculation of the construction stage and the moving load of the main bridge are carried out. The rationality of the original bridge design is verified from the point of view of stress and deformation. The stress and deformation state of the main bridge under moving load is defined. According to the characteristics of the bridge, the expression of the pre-arch degree is put forward, and the pre-arch value of each construction segment is obtained according to the calculation model of the main bridge, which can be used for the elevation of the vertical formwork. Through the analysis of the height and stress monitoring data of the main bridge, it is shown that the structural alignment and stress state can meet the requirements of the code during the construction process, and the rationality of the construction control of the bridge is further proved.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4
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