摘要
随着科学技术和交通事业的发展,预应力混凝土连续刚构桥以其施工简便、造价经济、受力合理、行车舒适等独特优势在近年来得到了迅速崛起,在主跨100-300m范围内几乎成为首选桥型。而在预应力混凝土连续刚构桥悬臂施工过程中,已建成梁段的线形在后期施工中是不可调节的,因此为了保证大桥的顺利合拢及成桥线形满足设计要求,同时成桥内力控制在设计容许范围内,必须在桥梁施工过程中进行施工控制工作。
本文结合新疆伊犁河特大桥工程,利用桥梁计算程序prbp对结构进行分析计算,同时对结构参数进行了敏感性分析及实验识别。在此基础上,根据实测值与理论值的对比分析,通过最小二乘法对主要结构参数进行调整,使调整后的实测值和理论值尽量相吻合。实践表明,本工程的监控是成功的,其所采用的理论与方法对预应力混凝土连续刚构桥施工控制具有较强的实用性。本文的研究工作,将为深入开展同类桥梁施工控制研究打下一定的基础。
With the development of science technology and traffic enterprise, the prestressed concrete continuous rigid frame bridge has been growing up rapidly in the recent years with it's unique predominance of handy construction, economical cost, reasonable internal force and comfortable traveling. It almost has become the first selective bridge style when the main span is in the range from 100m to 300m. During the cantilever construction of the prestressed concrete continuous rigid frame bridge, the beam axis shape of formed blocks can not be regulated during the next constructions. For the construction of the bridge is all right and the beam axis shape is exactitude for design, for internal force of the beam is appeased by design request, must to work about bridge construction control during the bridge construction.On the basis of the yi-li bridge of xing-jiang province, this paper used prbp to analyze the bridge structure, ascertained the sensitivity of the design parameters, and identified the design parameters through experiment. Based on this, according to the differences between the design value and the survey value, adjusted the primary design parameters by least square method to make the calculated accords with the actual value. It had been proved that this control was successful and the setheories and methods had highly practical effect on construction control of the prestressed concrete continuous rigid frame bridge. The researches of this paper will become the bases of the further research in the same aspect.
引文
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