大跨度混合梁斜拉桥合理状态的确定和整体稳定性研究
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摘要
混合梁斜拉桥以其独特的优势,已成为大跨度斜拉桥的主要发展趋势之一。随着跨径的增大,为保证桥梁结构建造过程中的受力安全和建成后的内力和线形满足设计要求,对混合梁斜拉桥合理状态的确定和整体稳定性进行研究是很有意义的。
大跨度混合梁斜拉桥合理状态的确定主要分两部分:合理成桥状态的确定和合理施工状态的确定。本文以九江长江大桥为工程背景,以平面杆系有限元程序FBR_CAL_SUO和SUS_CAL_SUO为计算软件,采用恒载平衡法、应力平衡法和最小二乘法相结合的综合法,并以控制结构在正常使用荷载作用下主梁的上、下缘的最大、最小应力为主要目标,以调整索力为主要手段,综合考虑恒载、活载、预应力及配重荷载等因素的影响,采用基于正装计算的优化法确定合理成桥状态。以这种方法确定的合理成桥状态与设计数据相比较,比较结果表明这种方法的结果是准确、可靠的。合理成桥状态确定后,采用“基于前进分析的两步到位法”确定大跨度混合梁斜拉桥的合理施工状态,保证施工过程中结构的受力安全和成桥阶段的合理成桥状态,计算结果证明了“两步到位法”的有效性和简捷性,同时也将为工程施工提供了计算依据。
稳定性是大跨度桥梁要须考虑的主要问题之一,而大跨度混合梁斜拉桥由于结构跨度大和不对称性,稳定问题更加突出,所以对大跨度混合梁斜拉桥的稳定研究是很有必要的。本文先对斜拉桥的第一、第二稳定问题进行了阐述,并对稳定性问题的评价指标进行了介绍,然后应用大型通用软件ANSYS对九江长江大桥的施工阶段和运营阶段的各工况进行了线性、几何非线性和双重非线性的稳定性分析,计算结果表明九江长江大桥无论是施工阶段还是成桥运营阶段,九江长江大桥的稳定系数都满足规范要求。
With its unique advantages, hybrid girder cable-stayed bridge has become one of the main directions of long-span cable-stayed bridge. As the span increases, for to ensure the security during the process of the bridge construction and to meet the design requirements of the internal force and linear of bridge structure after its completion, it is worthwhile to research the determination on the reasonable status and study on its overall stability of the hybrid girder cable-stayed bridge.
The determination on the reasonable state of the long-span hybrid cable-stayed bridge can be divided into two main parts: the determination of the reasonable finished state and the determination of the reasonable construction state. The paper bases on the engineering background of Jiujiang Yangtze River Bridge and the calculation software of the plane frame finite element program FBR_CAL_SUO and SUS_CAL_SUO, uses the synthesis method of dead load balance method、the stress balance method and the least squares method. This synthesis method calculates the influence of dead load, live load, prestressing force, weight load and other factors by aiming to restrict the maxim and minimum stress of the main beam under the normal load and by means of adjusting the cable tensile forces, and uses the optimized method of forward analysis to determine the reasonable finished state. It shows that this method is accurate and reliable by comparing the result with the design result. After the determination of the reasonable finished state, we adopt the "two-step in place based on forward analysis method" to determine the reasonable construction state of the long-span hybrid cable-stayed bridge, to ensure the stress security of structure during the process of construction and the reasonable finished status during the finished phase. The calculated results show that the "two-step method in place" method is effective and simple, and it also provides theoretical foundation for construction.
One of the main problems that long-span bridges should consider is the stability. While because of its large-span and asymmetry, the stability problem of the long-span hybrid cable-stayed bridge is especially evident. Thus, it is necessary to research the stability of the long-span hybrid cable-stayed bridge. This paper first expounds the stability question of the first and second of the cable-stayed bridge and introduced the evaluation indicators of the stability. Then it give an analysis of linear, nonlinear and geometric nonlinear on its operating conditions during the phase of the construction and operation by using the large universal software ANSYS. The calculation result shows that the stability factors of the Jiujiang Yangtze River Bridge meet the standard on both of the construction and operation phases.
大跨度混合梁斜拉桥合理状态的确定主要分两部分:合理成桥状态的确定和合理施工状态的确定。本文以九江长江大桥为工程背景,以平面杆系有限元程序FBR_CAL_SUO和SUS_CAL_SUO为计算软件,采用恒载平衡法、应力平衡法和最小二乘法相结合的综合法,并以控制结构在正常使用荷载作用下主梁的上、下缘的最大、最小应力为主要目标,以调整索力为主要手段,综合考虑恒载、活载、预应力及配重荷载等因素的影响,采用基于正装计算的优化法确定合理成桥状态。以这种方法确定的合理成桥状态与设计数据相比较,比较结果表明这种方法的结果是准确、可靠的。合理成桥状态确定后,采用“基于前进分析的两步到位法”确定大跨度混合梁斜拉桥的合理施工状态,保证施工过程中结构的受力安全和成桥阶段的合理成桥状态,计算结果证明了“两步到位法”的有效性和简捷性,同时也将为工程施工提供了计算依据。
稳定性是大跨度桥梁要须考虑的主要问题之一,而大跨度混合梁斜拉桥由于结构跨度大和不对称性,稳定问题更加突出,所以对大跨度混合梁斜拉桥的稳定研究是很有必要的。本文先对斜拉桥的第一、第二稳定问题进行了阐述,并对稳定性问题的评价指标进行了介绍,然后应用大型通用软件ANSYS对九江长江大桥的施工阶段和运营阶段的各工况进行了线性、几何非线性和双重非线性的稳定性分析,计算结果表明九江长江大桥无论是施工阶段还是成桥运营阶段,九江长江大桥的稳定系数都满足规范要求。
With its unique advantages, hybrid girder cable-stayed bridge has become one of the main directions of long-span cable-stayed bridge. As the span increases, for to ensure the security during the process of the bridge construction and to meet the design requirements of the internal force and linear of bridge structure after its completion, it is worthwhile to research the determination on the reasonable status and study on its overall stability of the hybrid girder cable-stayed bridge.
The determination on the reasonable state of the long-span hybrid cable-stayed bridge can be divided into two main parts: the determination of the reasonable finished state and the determination of the reasonable construction state. The paper bases on the engineering background of Jiujiang Yangtze River Bridge and the calculation software of the plane frame finite element program FBR_CAL_SUO and SUS_CAL_SUO, uses the synthesis method of dead load balance method、the stress balance method and the least squares method. This synthesis method calculates the influence of dead load, live load, prestressing force, weight load and other factors by aiming to restrict the maxim and minimum stress of the main beam under the normal load and by means of adjusting the cable tensile forces, and uses the optimized method of forward analysis to determine the reasonable finished state. It shows that this method is accurate and reliable by comparing the result with the design result. After the determination of the reasonable finished state, we adopt the "two-step in place based on forward analysis method" to determine the reasonable construction state of the long-span hybrid cable-stayed bridge, to ensure the stress security of structure during the process of construction and the reasonable finished status during the finished phase. The calculated results show that the "two-step method in place" method is effective and simple, and it also provides theoretical foundation for construction.
One of the main problems that long-span bridges should consider is the stability. While because of its large-span and asymmetry, the stability problem of the long-span hybrid cable-stayed bridge is especially evident. Thus, it is necessary to research the stability of the long-span hybrid cable-stayed bridge. This paper first expounds the stability question of the first and second of the cable-stayed bridge and introduced the evaluation indicators of the stability. Then it give an analysis of linear, nonlinear and geometric nonlinear on its operating conditions during the phase of the construction and operation by using the large universal software ANSYS. The calculation result shows that the stability factors of the Jiujiang Yangtze River Bridge meet the standard on both of the construction and operation phases.
引文
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