钢管混凝土拱桥施工监控及吊杆张力控制
发布时间：2019-06-17 21:44
【摘要】：钢管混凝土拱桥是一类将梁和拱有机结合起来的桥梁结构,该结构体系近年来才在我国兴起。在施工过程中主梁与拱肋的线形及内力、混凝土浇筑时钢管的温度应力、吊杆的索力值均需要建立合适的施工监控体系来加以控制。本文以牟家村跨同三高速公路64m系杆拱桥为工程背景,结合现有施工监控的理论和方法,对各施工阶段桥梁的状态进行了数据采集及分析,保证了桥梁成桥后线形、应力及吊杆索力符合规范要求。主要完成的工作内容如下:(1)采用桥梁博士对全桥进行了有限元模拟,得到各阶段主梁与拱肋的理论累计位移,将计算结果与设计资料对比,验证了模型的可靠性,在施工过程中,根据现场材料试验及实测数据,对模型中各参数进行调整,以提高控制精度。(2)采用自适应度方法对桥梁进行线形监控,利用最小二乘法对桥梁主要参数进行识别,并对桥梁各阶段变形进行预测,结合有限元模型给出主梁与拱肋的预拱度,确定立模标高,得到了理想的成桥线形。(3)分析了施工控制中影响应力控制的因素,对温度及收缩徐变的影响进行了论述,采用收缩徐变相关理论,对实测应变中的非荷载应变进行分离,得到更接近实际应力的应力检测结果。(4)采用MIDAS/FEA有限元软件对钢管混凝土拱肋进行有限元模拟,分析在浇筑混凝土过程中,释放的水化热以及对钢管拱肋的影响。结果表明,钢管混凝土拱浇筑过程中会释放大量的水化热,具有大体积混凝土温度场的特征。(5)吊杆的索力直接影响着整个桥梁的受力状态,因而对吊杆索力的识别至关重要。选择合适的实用公式对本桥的吊杆索力进行识别,并利用影响矩阵法对本桥吊索进行精确调整,成桥后索力误差小于5%,证明了影响矩阵法调索的有效性。
[Abstract]:Concrete-filled steel tubular arch bridge is a kind of bridge structure which combines beam and arch organically, and the structure system has only emerged in our country in recent years. In the construction process, the alignment and internal force of the main beam and arch ribs, the temperature stress of the steel pipe and the cable force of the suspender should be controlled by establishing a suitable construction monitoring system to control the temperature stress of the steel pipe and the cable force of the suspender during concrete pouring. In this paper, taking the 64m tied arch bridge of Moujiacun Tongshan Expressway as the engineering background, combined with the existing construction monitoring theories and methods, the data acquisition and analysis of the state of the bridge in each construction stage are carried out to ensure that the bridge alignment, stress and suspender cable force meet the requirements of the code. The main contents are as follows: (1) the finite element simulation of the whole bridge is carried out by Dr. Bridge, and the theoretical cumulative displacement of the main beam and arch ribs is obtained. The calculated results are compared with the design data to verify the reliability of the model. In the construction process, according to the field material test and measured data, the parameters in the model are adjusted. In order to improve the control accuracy. (2) the adaptive method is used to monitor the bridge alignment, the least square method is used to identify the main parameters of the bridge, and the deformation of each stage of the bridge is predicted. Combined with the finite element model, the pre-arch degree of the main beam and arch ribs is given, the vertical mold standard height is determined, and the ideal bridge alignment is obtained. (3) the factors affecting stress control in construction control are analyzed. The influence of temperature and shrinkage creep is discussed. The non-load strain in the measured strain is separated by using the theory of shrinkage creep, and the stress detection results which are closer to the actual stress are obtained. (4) the finite element simulation of concrete-filled steel tubular arch ribs is carried out by using MIDAS/FEA finite element software, and the hydration heat released and the influence on steel tube arch ribs in the process of pouring concrete are analyzed. The results show that a large amount of hydration heat will be released during the pouring process of concrete-filled steel tubular arch, which has the characteristics of mass concrete temperature field. (5) the cable force of the suspender directly affects the stress state of the whole bridge, so it is very important to identify the cable force of the suspender. The suitable practical formula is selected to identify the cable force of the suspender of the bridge, and the influence matrix method is used to accurately adjust the cable of the bridge. The cable force error is less than 5% after the bridge is completed, which proves the effectiveness of the influence matrix method to adjust the cable.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4
本文编号：2501286
[Abstract]:Concrete-filled steel tubular arch bridge is a kind of bridge structure which combines beam and arch organically, and the structure system has only emerged in our country in recent years. In the construction process, the alignment and internal force of the main beam and arch ribs, the temperature stress of the steel pipe and the cable force of the suspender should be controlled by establishing a suitable construction monitoring system to control the temperature stress of the steel pipe and the cable force of the suspender during concrete pouring. In this paper, taking the 64m tied arch bridge of Moujiacun Tongshan Expressway as the engineering background, combined with the existing construction monitoring theories and methods, the data acquisition and analysis of the state of the bridge in each construction stage are carried out to ensure that the bridge alignment, stress and suspender cable force meet the requirements of the code. The main contents are as follows: (1) the finite element simulation of the whole bridge is carried out by Dr. Bridge, and the theoretical cumulative displacement of the main beam and arch ribs is obtained. The calculated results are compared with the design data to verify the reliability of the model. In the construction process, according to the field material test and measured data, the parameters in the model are adjusted. In order to improve the control accuracy. (2) the adaptive method is used to monitor the bridge alignment, the least square method is used to identify the main parameters of the bridge, and the deformation of each stage of the bridge is predicted. Combined with the finite element model, the pre-arch degree of the main beam and arch ribs is given, the vertical mold standard height is determined, and the ideal bridge alignment is obtained. (3) the factors affecting stress control in construction control are analyzed. The influence of temperature and shrinkage creep is discussed. The non-load strain in the measured strain is separated by using the theory of shrinkage creep, and the stress detection results which are closer to the actual stress are obtained. (4) the finite element simulation of concrete-filled steel tubular arch ribs is carried out by using MIDAS/FEA finite element software, and the hydration heat released and the influence on steel tube arch ribs in the process of pouring concrete are analyzed. The results show that a large amount of hydration heat will be released during the pouring process of concrete-filled steel tubular arch, which has the characteristics of mass concrete temperature field. (5) the cable force of the suspender directly affects the stress state of the whole bridge, so it is very important to identify the cable force of the suspender. The suitable practical formula is selected to identify the cable force of the suspender of the bridge, and the influence matrix method is used to accurately adjust the cable of the bridge. The cable force error is less than 5% after the bridge is completed, which proves the effectiveness of the influence matrix method to adjust the cable.
【学位授予单位】：烟台大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4
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