沂河矮塔现浇钢筋混凝土结构斜拉桥施工全过程监控研究

发布时间：2018-03-10 05:25

本文选题：矮塔斜拉桥　切入点：施工监控　出处：《青岛理工大学》2016年硕士论文　论文类型：学位论文

【摘要】：矮塔斜拉桥综合了斜拉桥与梁桥的优势性能,且有施工方便、经济性好、技术比较先进、跨径选择较多、桥型独特美观且与周围环境相协调的优势,在工程界倍受关注。此类型得到了业内的广泛认可,在国内外迅速发展起来。为了保证桥梁施工过程中的安全和成桥后达到理想状态,需要在矮塔斜拉桥施工过程中进行监控。本文以临沂市陶然路沂河大桥主桥为工程实例,对矮塔斜拉桥的施工监控进行研究,具体内容如下:(1)介绍了矮塔斜拉桥的发展概况、特点及优越性,并概述了矮塔斜拉桥施工监控的目的和意义。(2)介绍了施工控制的内容和影响因素,归纳了施工控制方法和施工控制计算方法;沂河大桥主桥的施工控制方法采用自适应控制法,施工控制计算方法采用正装计算法。(3)用MIDAS/Civil软件建立了沂河大桥主桥的有限元理论模型,得到了施工阶段和成桥阶段结构受力和变形的理论值,还有斜拉索的初拉力理论值。根据模型的理论计算也得到了主梁的立模标高。(4)对沂河大桥主桥各参数进行敏感性分析和识别,通过对结构参数的敏感性分析,得出结构的主要影响参数。施工过程中用最小二乘法对主要参数进行修正,同时忽略次要参数的影响,计算模型会更接近实际结构,施工控制过程中模型理论计算值会更准确。对温度这种无法修正的参数造成的误差,可直接根据温度敏感性分析结果直接进行修正。(5)介绍了沂河大桥主桥的监控目标、原则和方案,并对沂河大桥主桥进行了施工监控;在施工过程中根据实测值与理论值之间误差实时调整修正结构主要参数的理论值,进而参数的理论值更接近参数的实际值。沂河大桥主桥在施工过程中结构受力和变形的实测值与理论值接近而且变化趋势相同;斜拉索索力的实测值与理论值之间的误差较小,误差在允许的范围内;桥梁的施工监控取得了很好的效果。最终的成桥状态满足设计要求。通过本文对沂河大桥主桥施工控制的介绍,以期为类似桥梁施工监控提供相关参考和有益的借鉴。
[Abstract]:The advantages of cable-stayed bridge and the bridge low tower cable-stayed bridge, and convenient construction, good economy, advanced technology, span more choices, beautiful and unique style in harmony with the surrounding environment advantages, has attracted much attention in engineering circles. This type has been widely recognized in the industry, the rapid development of at home and abroad. In order to ensure the bridge construction process to achieve the ideal state safety and bridge, need to be monitored in the low tower cable-stayed bridge during construction. In this paper, the main bridge of Linyi Taoran road Yi River Bridge as an example, the extradosed cable-stayed bridge construction monitoring is studied, the specific contents are as follows: (1) introduced the general development of the extradosed cable-stayed bridge, characteristics and advantages, and summarizes the purpose and significance of the extradosed cable-stayed bridge construction control. (2) introduces the contents and influencing factors of construction control, summarizes construction control methods and construction control calculation Method; construction control method of Yi River Bridge by using the adaptive control method, construction control calculation method using the forward calculation method. (3) the theory of finite element model of Yi River Bridge was established by the MIDAS/Civil software, the construction stage and the bridge structure stress and deformation of the theoretical value, and the cable initial tension theory according to the theoretical calculation value. The model has also been established. The main beam elevation model (4) for sensitivity analysis and identification of the parameters of the Yihe River Bridge, through the sensitivity analysis of structural parameters, the main structure of the shadow ring parameters. By using the least square method in the construction process by modifying the main parameters, and ignore the secondary parameters the calculation model will be more close to the actual structure, model theory in the process of construction control calculation will be more accurate. The error caused by the parameters on the temperature that cannot be modified, can be directly root According to the analysis results of temperature sensitivity correction. (5) introduced the monitoring target Yi River Bridge, the principle and scheme, and the Yi River Bridge for construction monitoring; in the construction process according to the measured value and the theoretical value between the real-time adjustment of the error correction of main structure parameters of the theoretical value, practical value and theoretical value parameters close to the river bridge. The parameters in the construction process of structural stress and deformation of close to the actual value and the same trend with the theoretical value and the theoretical value; small error between the measured cable force value, the error is in the allowable range; monitoring of bridge construction has achieved good results in the final. The bridge can meet the design requirements. This paper on the construction control of Main Bridge River Bridge is introduced, in order to provide relevant and helpful reference for similar bridge construction monitoring.

【学位授予单位】：青岛理工大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U445.4

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