五象大桥合理状态研究及其成桥状态参数敏感性分析

发布时间：2018-05-22 17:41

  本文选题：斜拉桥 + 钢箱梁　； 参考：《长沙理工大学》2014年硕士论文

【摘要】：本文研究的五象大桥,属于结构对称而施工工艺不对称的混凝土主塔钢主梁斜拉桥,该桥的施工特点导致结构在施工过程的受力分析十分复杂,确定的本桥合理状态具有重要意义。主要工作内容如下：1)对比研究了在五象大桥成桥索力初拟时采用刚性支承连续梁法、最小弯曲能量法的计算结果,总结出两种算法确定的拉索索力、土梁弯矩、索塔弯矩支反力等特点,为后文确定五象大桥的合理状态打基础。2)提出了“确定混凝土主塔钢箱梁斜拉桥合理成桥状态的综合法”。该方法首先运用“最小弯曲能量法”进行恒载索力初拟,然后进行索力调匀,即可得到一组较均匀的恒载索力,斜拉桥索塔的弯矩较小；然后采用应力平衡法考虑活载的影响,计算最小弯矩可行域,基于五象大桥主塔与主梁的材料特性,控制目标物理量可行域时,以主塔应力为主,主梁应力为辅,结合影响矩阵和最小二乘法原理得到成桥状态的调整量,进而可以确定的合理成桥状态；把“确定混凝土主塔钢箱梁斜拉桥合理成桥状态的综合法”确定五象大桥的合理成桥状态,并进行成桥检验。验证了该方法的可行性和实用性。3)提出了一种简便实用的正装迭代的方法进行求解安装索力,与常规的方法比较,计算较为简便,并在求解五象大桥的合理施工状态中,得以应用。探讨了两种施工方案的合理施工状态,通过对比分析两种方案的合理性,提出建议和措施,节省了工期,提高了功效；确定了合理施工状态所需的控制参数即张拉索力,钢主梁无应力线形和安装标高、无应力索长等参数。4)通过对影响成桥状态作参数敏感性分析：对施工过程的梁重,主梁刚度,主塔刚度,温度变化,拉索弹性模量等构件参数的进行偏差预估,并采用nidas/civil进行建模计算分析,对影响钢箱梁主粱斜拉桥成桥状态的构件参数权重分析,为确保大桥最大限度地逼近合理成桥状态提供了理论依据。
[Abstract]:The Wuxiang Bridge studied in this paper belongs to the cable-stayed bridge with symmetrical structure and asymmetrical construction technology. The construction characteristics of the bridge lead to the complicated analysis of the stress of the structure during the construction process. It is of great significance to determine the reasonable state of the bridge. The main work of this paper is as follows: (1) the calculation results of the rigid supported continuous beam method and the minimum bending energy method in the initial drawing of the cable force of the Wusheng Bridge are compared and studied, and the cable force and the earth beam bending moment determined by the two algorithms are summarized. In order to determine the reasonable state of Wuxiang Bridge, a comprehensive method for determining the reasonable state of the cable-stayed bridge with concrete main tower steel box girder is put forward. In this method, the minimum bending energy method is first used for the initial calculation of the dead load cable force, and then the cable force is adjusted to obtain a group of uniform dead load cable forces, and the cable tower of the cable-stayed bridge has less bending moment, and then the stress balance method is used to consider the effect of live load. Based on the material characteristics of the main tower and main beam of Wuxiang Bridge, the stress of the main tower is the main stress and the stress of the main beam is auxiliary when the feasible region of the target physical quantity is controlled by calculating the feasible region of minimum bending moment. Combined with the influence matrix and the least square method, the adjustment quantity of the bridge state can be obtained, and then the reasonable bridge state can be determined. The reasonable state of Wuxiang Bridge is determined by "Comprehensive method for determining the reasonable completion State of Cable-stayed Bridge with Steel Box girder with main concrete Tower", and the bridge completion test is carried out. The feasibility and practicability of this method are verified. 3) A simple and practical formal iterative method is proposed to solve the installation cable force. Compared with the conventional method, the calculation is relatively simple, and in solving the reasonable construction state of Wuxiang Bridge, Can be applied. This paper probes into the reasonable construction state of the two kinds of construction schemes, by comparing and analyzing the rationality of the two schemes, puts forward some suggestions and measures, saves the construction period, improves the efficiency, and determines the control parameters required for the reasonable construction state, that is, the tension force. Through the parameter sensitivity analysis of the influence on the state of the bridge, such as the beam weight, the stiffness of the main beam, the stiffness of the main tower, the change of temperature, etc. The deviation of elastic modulus of cable and other component parameters are estimated, and nidas/civil is used to model and analyze the weight of component parameters, which affect the state of the steel box girder main beam cable-stayed bridge. The theoretical basis is provided to ensure that the bridge can approach the reasonable state of the bridge as much as possible.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U448.27
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本文编号：1923018