中承式钢管混凝土拱桥拆除阶段受力安全性能分析
发布时间：2018-08-11 13:50
【摘要】：本文结合依兰牡丹江大桥主桥的拆除施工,对中承式钢管混凝土拱桥的拆除方法、施工控制及施工阶段受力安全性能进行研究。 由于依兰牡丹江大桥主桥的工作性能已不能满足运营要求,需要拆除重建。本文结合目前两类主流桥梁拆除方法——爆破法和机械拆除法,根据依兰牡丹江大桥自身受力特点、拆除要求及环境限制,确定了拆除方案。然后按照拆除方案,运用空间有限元软件Midas/Civil对拆除过程各个阶段进行模拟,分析温度及风荷载对结构受力的影响,同时对拱肋变形及应力的变化规律、拱脚转角及水平推力进行分析。 为了保证桥梁顺利安全拆除,根据拆除方案建立完备的施工监控系统,在施工过程实测温度及风速,调整模型参数,确定拆除过程中变形及应力限值,将数据实测值与理论值进行对比分析,构成施工监控预警系统,确保拆除施工的顺利进行。最后对拆除过程中保留的主要受力构件——拱肋的受力安全性能进行分析,拱肋在拆除过程中始终处于安全可控的状态。 通过研究表明,根据不同的实际工程要选取与其相适应的施工方法及工艺,并要考虑到可能影响到结构的自然因素,利用有限元软件对施工过程模拟分析可以对施工方案提供建议,本文所研究的内容对同类桥梁的拆除施工具有一定的参考价值。
[Abstract]:Combined with the demolition construction of the main bridge of Yilan Mudanjiang Bridge, this paper studies the demolition method, construction control and stress safety performance of the through concrete filled steel tube arch bridge. Since the main bridge of Yilan Mudanjiang Bridge can not meet the operational requirements, it is necessary to demolish and rebuild it. Combined with two kinds of main methods of bridge demolition at present-blasting method and mechanical demolition method, according to the mechanical characteristics of Yilan Mudanjiang Bridge, demolition requirements and environmental restrictions, the demolition scheme is determined. Then according to the demolition scheme, using the spatial finite element software Midas/Civil to simulate the various stages of the demolition process, analyze the influence of temperature and wind load on the stress of the structure, and at the same time, analyze the deformation and stress variation of the arch rib. The angle and horizontal thrust of arch foot are analyzed. In order to ensure the smooth and safe demolition of the bridge, a complete construction monitoring system is established according to the demolition scheme. The temperature and wind speed during the construction process are measured, the model parameters are adjusted, and the deformation and stress limit values during the demolition process are determined. By comparing the measured data with the theoretical values, a construction monitoring and warning system is constructed to ensure the smooth construction of demolition construction. Finally, the mechanical safety performance of arch rib, which is the main force member retained in the process of demolition, is analyzed. The arch rib is always in a safe and controllable state during the process of demolition. The research shows that according to different practical projects, the construction methods and techniques should be selected, and the natural factors that may affect the structure should be taken into account. Using finite element software to simulate the construction process can provide suggestions for the construction scheme. The contents of this paper have certain reference value for the similar bridge demolition and construction.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.6
本文编号：2177171
[Abstract]:Combined with the demolition construction of the main bridge of Yilan Mudanjiang Bridge, this paper studies the demolition method, construction control and stress safety performance of the through concrete filled steel tube arch bridge. Since the main bridge of Yilan Mudanjiang Bridge can not meet the operational requirements, it is necessary to demolish and rebuild it. Combined with two kinds of main methods of bridge demolition at present-blasting method and mechanical demolition method, according to the mechanical characteristics of Yilan Mudanjiang Bridge, demolition requirements and environmental restrictions, the demolition scheme is determined. Then according to the demolition scheme, using the spatial finite element software Midas/Civil to simulate the various stages of the demolition process, analyze the influence of temperature and wind load on the stress of the structure, and at the same time, analyze the deformation and stress variation of the arch rib. The angle and horizontal thrust of arch foot are analyzed. In order to ensure the smooth and safe demolition of the bridge, a complete construction monitoring system is established according to the demolition scheme. The temperature and wind speed during the construction process are measured, the model parameters are adjusted, and the deformation and stress limit values during the demolition process are determined. By comparing the measured data with the theoretical values, a construction monitoring and warning system is constructed to ensure the smooth construction of demolition construction. Finally, the mechanical safety performance of arch rib, which is the main force member retained in the process of demolition, is analyzed. The arch rib is always in a safe and controllable state during the process of demolition. The research shows that according to different practical projects, the construction methods and techniques should be selected, and the natural factors that may affect the structure should be taken into account. Using finite element software to simulate the construction process can provide suggestions for the construction scheme. The contents of this paper have certain reference value for the similar bridge demolition and construction.
【学位授予单位】：东北林业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U445.6
【参考文献】
相关期刊论文 前1条
1 王文君;;系杆拱桥拆除施工技术探讨[J];交通科技;2010年S2期
，本文编号：2177171
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