【作者】 王长青；

【导师】 张光辉；

【作者基本信息】 武汉理工大学 ， 结构工程， 2006， 硕士

【摘要】 近年来随着桥梁跨度的不断增大，施工控制问题也日益成为设计和施工中的关键而深受关注。本文依托伊犁河特大桥工程的施工监测与控制，研究最新的施工控制理论与方法。 桥梁的施工控制包括结构线形和结构应力两方面的内容，具有同等的重要性，必须进行全面的控制才能使施工顺利进行，最后达到设计状态要求。本文系统的介绍了施工控制的内容、方法，并对施工控制中桥梁结构的计算方法作了分析，建立大桥结构分析模型，选择合适的影响因素，包括结构参数识别及调整、施工工艺、施工监测方法、温度效应、混凝土弹性模量及收缩、徐变效应等，并经监测、反馈、预测，实现大桥线形和应力的不断调整和控制，达到了预定的目标。由PC刚构—连续组合梁桥的特点，采用离散性系统和最小二乘法进行结构状态参数估计及反馈控制，对现有预测控制方法作更深入的研究。伊犁特大桥施工仿真计算使用的分析软件有ANSYS和GQJS，并结合MATLAB对施工过程中结构状态参数进行调整。 在工程应用中，重点分析了温差对结构施工的影响，以及对结构状态参数的识别和调整。 温度应力分为温度次应力和温度自应力。在混凝土结构中，由于混凝土导热系数小，外部环境急变时，内部温度变化存在明显的滞后现象。在伊犁河大桥施工中，用ANSYS软件对结构在合拢前及合拢后，由温度应力产生的挠度、应力变化进行了详细分析。 参数误差是引起大跨度桥梁施工误差的主要因素之一，结构参数的变化能导致结构内力的变化和形状的改变，因此，我们在大跨度桥梁的施工控制中，必须对结构参数进行识别和修正，找到对结构状态影响较大的主要设计参数，利用多元线性回归的最小二乘法，辅助数学计算软件MATLAB，求出参数误差估计值，最后用调整后的参数对系统进行前进和倒退分析，得到各阶段挠度的新的理想状态。更多还原

【Abstract】 Along with the augment of bridge span recently, construction control became more vital and attentional. Up to date theory and means of construction control is researched by construction monitor and control of Yi-li river long span bridge in Xin-jiang province.Construction control of bridge consists of the control of structural alignment and structural stress. They have the same importance in construction control. in order to get ideal goal we must enforce all-around control in procession of construction. in this paper we introduce the content and method of construction systematically, and analyze the computation method of bridge structure in construction control. firstly, we erected structural simulation model of the bridge, and selected rational influence factors, which include parametric recognition of structure, construction technology, method of construction monitor, temperature effect, modulus of elasticity of concrete and contract and creep effect etc, and the alignment and stress of the bridge were adjusted unceasingly by monitor, feedback, and forecast during construction, at last, we got the preplanned goal, according to the property of long span PC bridge with rigid frame-continuous girders, we go about the parametric estimation and feedback control by establishing discrete simulation model and utilizing least square method. We used the analytic software ANSYS,GQJS in simulation computation of the process of construction of Yi-li long span bridge, and combining software MATLAB we adjusted structural design parameter in process of construction.In the chapter of engineering application, we elaborate the influence of temperature difference in structure, as well as the recognition and adjustment of structural condition parameter.Temperature includes two aspect content, one is temperature stress of itself, the other is temperature secondary stress,. In concrete structure, due to coefficient of conduction for concrete is small, when external environment changes sharply, the change for internal temperature has distinct hysteresis. in construction of Yi-li river long span bridge, we thoroughly analyze structural deflection and stress before the folding posed by temperature difference, as well as that after the folding.Parametric deviation is one of the important factors that poses construction deviation of long span bridge, the change for structure parameter can result in the change of internal force and shape of structure, therefore, we must carry through recognition and adjustment of structure parameter in the construction control of long span bridge, firstly, we should find out the main design parameter, according to least square method and multiple linear regression, and resort to the computation software MAT LAB, then we can get the parametric error estimation value, finally, we use the adjusted parameter to analyze the structure through upright method and upside-down mounting method, then get the new deviation and stress of every construction state.更多还原