大跨径混凝土连续箱梁桥体外预应力索张拉时的施工监控

发布时间：2018-03-26 03:54

本文选题：预应力变截面连续箱梁　切入点：施工监控　出处：《中南大学》2014年硕士论文

【摘要】：变截面混凝土连续箱梁桥由于其优美的外形,良好的结构受力性能,近年来得到了越来越广泛的应用。但随着桥梁跨径的增大,施工工艺要求不断提升,施工过程变得越来越复杂,同时桥梁本身还要受温度、湿度、时间等因素的影响,因此,桥梁内力和位移的变化情况也变得越来越复杂,如何使桥梁施工过程可控,确保桥梁内力和位移符合设计要求是目前大跨径混凝土变截面连续箱梁桥施工的难点。本文以佛开高速—吉利河大桥加固为研究背景,围绕混凝土变截面箱梁桥的施工监控展开课题研究。通过有针对性的监控加固桥梁施工过程中桥梁的应力、应变、位移、温度等因素变化,并进行相应的理论分析,来确保施工桥梁宏观质量和桥梁结构安全。 1.本文提供了一整套的监测内容流程,并介绍了测点的布置,以监测其桥梁的变形、应力应变、箱梁温度场、张拉力和裂缝。 2.本文进行了总体监控和实时监控,得到其温度、张拉力、挠度和应变的数据,以保证桥梁结构的正常运营。 3.对各施工阶段下结构实时监测结果和理论计算结果进行对比分析,及时分析结构实测值与理论计算值之间的差异,准确把握每道施工工序下结构的状态,保证施工过程中结构的安全,同时合理评价结构的加固效果提供基础数据,为结构在后期运营过程中进行的长期监测积累初始数据。本工程案例为加固桥梁,采用加固方法为对结构施加体外预应力索,结果表明,施加体外预应力索能够提高结构压应力储备,加固效果达到了设计目的和要求。
[Abstract]:Continuous box girder bridge with variable cross-section has been used more and more widely in recent years because of its beautiful shape and good structural mechanical performance. However, with the increase of bridge span, the construction technology requirements are constantly raised. The construction process becomes more and more complex, and the bridge itself is also affected by temperature, humidity, time and other factors. Therefore, the change of internal force and displacement of the bridge becomes more and more complex, how to make the bridge construction process controllable, To ensure that the internal force and displacement of the bridge meet the design requirements is the difficult point in the construction of the long-span concrete continuous box girder bridge with variable cross-section at present. In this paper, the reinforcement of the Fokai High-speed Geely River Bridge is taken as the research background. The research is carried out around the construction monitoring of concrete variable-section box girder bridge. The stress, strain, displacement, temperature and other factors of the bridge during the construction process are monitored and strengthened, and the corresponding theoretical analysis is carried out. To ensure the macro quality of construction bridge and bridge structure safety. 1. This paper provides a complete set of monitoring flow, and introduces the layout of measuring points to monitor the bridge deformation, stress and strain, box girder temperature field, tensile force and cracks. 2. The data of temperature, tension, deflection and strain are obtained in order to ensure the normal operation of bridge structure. 3. Comparing and analyzing the results of real-time monitoring and theoretical calculation of structure in each construction stage, analyzing the difference between the measured value of structure and the calculated value of theory in time, and accurately grasping the state of structure under each construction procedure. To ensure the safety of the structure during the construction process and to provide basic data for the reasonable evaluation of the reinforcement effect of the structure, the initial data can be accumulated for the long-term monitoring of the structure in the later period of operation. The case of this project is to strengthen the bridge, and the external prestressed cable is applied to the structure by strengthening method. The results show that the external prestressed cable can increase the compressive stress reserve of the structure, and the reinforcement effect achieves the design purpose and requirement.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.4

【共引文献】