【作者】 赵晓龙；

【导师】 李运生； 王慧东；

【作者基本信息】 石家庄铁道学院 ， 桥梁与隧道工程， 2009， 硕士

【摘要】 大跨度预应力混凝土连续梁桥采用悬臂方法施工时要经历一个复杂的过程,在此过程中将受到许多确定和不确定因素的影响,而导致桥梁结构的实际状态偏离预期状态,从而出现受力不合理,桥梁难以顺利合龙,使成桥受力和线形形状与设计要求不符,所以对桥梁实施控制是非常重要的。因此,必须采用合理的结构分析理论和计算方法来确定桥梁结构施工过程中的每个阶段的受力和变形。而桥梁施工控制就是在结构分析基础上通过对施工过程中的应力及线形进行控制,对施工中出现的偏差进行分析识别,发现问题并及时进行纠正,同时对结构的后续阶段进行正确预测,最终目标使成桥状态达到设计要求。本文以松花江大桥为工程背景,详细的论述了本桥的线性控制理论及方法。利用MIDAS软件建立有限元模型,分析桥梁在各个施工阶段的受力和变形,根据分析结果计算出预抛高值。结合松花江大桥实际施工监控情况,提出合理的实施方案,制定施工控制流程,建立全面有效的控制系统,分层次分阶段制定解决方案。对挠度、温度、应力进行观测,检测材料力学参数,箱梁几何尺寸以及预应力张拉等内容。然后,对采集的原始数据和理论计算数据分别进行对比分析,分析理论计算与实际施工情况之间的差异,并逐渐调整模型使理论与实测值之间相吻合。运用现代预测控制理论,调整参数,进行结构前进分析和倒退分析,并预告控制信息,提出合理的方案以指导施工。针对松花江大桥施工监控的结果,本文详细比较了梁体阶段挠度、累计挠度、各阶段测点应力的计算值和实测值的关系；并结合松花江大桥所处的地理环境对寒冷地区的混凝土桥梁结构温度场及温度效应的影响进行了现场监测及试验。最终监控结果表明,本桥达到了线性平顺、受力合理的预期目的。更多还原

【Abstract】 Cantilever construction method used in long-span continuous prestressed concrete girder bridge to be going through a complicated process, this process will be determined by many certain and uncertain factors, and a bridge leading to the actual structure of the state is expected to depart from it, which appears by unreasonable structure stress and construction linear, so that the closure of bridge and the design does not to be required. Therefore, Construction Monitoring of the bridge is very important. It is necessary to adopt a reasonable analysis theory and calculation method to determine the stress and deformation at every stage of the bridge construction process. Construction Monitoring of the bridge is based on analysis the construction process of stress and linear control, the construction of the error analyzed to identify, the problem be corrected in a timely adjust and at the same time the structure of the followed stage be able to correctly predict. The ultimate goal of the finished bridge state is to meet the design requirements.Based on the construction of Songhuajiang Bridge, the finite element model of the bridge is established by the MIDAS software to analyze the bridge construction in various stages of deformation and force, according to the analysis of the results to calculate the flip-height. In accordance with the practical construction monitoring situation of Songhuajiang Bridge, the reasonable observation schemes are proposed, the flow of construction monitoring is designed, and the effective control system is built. Deflection, temperature and stress are observed, material mechanical property, physical dimension of box beam and prestressing are measured. Then analyze the difference between the theoretical calculation and original data collected. Gradually adjusted the theoretical model so that match the theoretical calculation to the original data collected. By using modern predictive control theory, through parameter adjustment, forward and backward analysis, to forecast the control information and propose reasonable plan, so as to instruct the construction. Finally, monitoring results of the project of Songhuajiang Bridge are introduced in this article, the real deflection; displacement and stress of segments are accordance with comparing. Then, the Songhuajiang Bridge on the geographical location of the cold areas Bridge structure temperature field and temperature effects are monitor and tested. The results showed that the ultimate control of this bridge have reached an anticipative goal in smooth linear and reasonable structure stress.更多还原