大跨度悬索桥钢混组合桥面系温度效应分析

发布时间：2018-04-23 13:34

本文选题：悬索桥 + 桥面系　；参考：《长沙理工大学》2014年硕士论文

【摘要】：当代社会经济迅猛发展,随之增加的交通负荷使许多桥梁面临严峻考验,其中桥面系的病害是诸多桥梁结构所共同面临的严重问题,在大跨度悬索桥中尤为突出。钢-混凝土组合桥面系的应用给这一问题带来了新的契机,其独特的构造显著提高了整体抗弯强度,优化了整体受力性能,具有很可观的发展前景。但目前对这种新型结构形式的温度效应研究还十分匮乏,现有分析均基于我国桥梁通用规范中的相关规定,将三维温度场简化为一维进行考虑,忽略纵、横向温差的影响,此举虽很大程度上简化了计算过程,但与大跨度悬索桥钢混组合桥面系的实际受力情况相差较大。尤其当太阳辐射强度较高时,钢主梁对外界温度较为敏感,可在短时间内迅速升温,从而导致某一时刻纵、横向产生很大温差。因此,本文以湘西矮寨大桥为工程依托,采用现场实测结合有限元模拟的方式对钢混组合桥面系的温度效应进行研究。主要工作包括：参考国内外相关文献,对钢-混组合结构温差应力的理论计算方法进行了详细的介绍,引入温度止内力概念对传统计算模式进行优化,并通过实例验证其有效性。在此基础上以某大跨度悬索桥为工程依托,通过现场实测数据的分析和整理拟合出最不利情况下钢桁加劲梁纵、横向的温度分布曲线。同时采用ansys软件对依托工程进行有限元模拟,依据我国通用桥梁规范中关于温度的相关规定,结合现场实测数据对大跨度悬索桥钢混组合桥面系不同工况下的温度效应进行分析,并着重探讨钢桁加劲梁纵、横温度梯度对组合桥面系温度应力的影响。研究结果表明：温度效应对组合桥面系的作用十分显著；钢桁梁横向温差对组合桥面系温度应力的影响较大,设计时应加以考虑,而纵向温差对其影响较小,可忽略不计。
[Abstract]:With the rapid development of modern society and economy, the increasing traffic load makes many bridges face severe test. The bridge deck system is a serious problem faced by many bridge structures, especially in long-span suspension bridges. The application of steel-concrete composite deck system has brought a new opportunity to this problem. Its unique structure has significantly improved the overall flexural strength, optimized the overall mechanical performance, and has a considerable development prospect. However, the research on the temperature effect of this new type of structure is still very scarce. The existing analysis is based on the relevant provisions of the general code for bridges in our country. The three-dimensional temperature field is simplified to one dimension, and the effects of longitudinal and transverse temperature difference are ignored. Although this method simplifies the calculation process to a great extent, it is quite different from the actual force situation of steel-concrete composite deck system of long-span suspension bridge. Especially when the solar radiation intensity is high, the steel main beam is sensitive to the external temperature, and can be heated rapidly in a short time, which leads to a large temperature difference between longitudinal and transverse at a certain time. Therefore, the temperature effect of steel-concrete composite deck system is studied by means of field measurement and finite element simulation based on the construction of Paizhai Bridge in the west of Hunan Province. The main work includes: referring to the relevant literature at home and abroad, the theoretical calculation method of temperature difference stress of steel-concrete composite structure is introduced in detail, and the traditional calculation model is optimized by introducing the concept of temperature-stopping internal force. An example is given to verify its validity. On this basis, based on a long-span suspension bridge, the temperature distribution curves of steel truss stiffened beam under the most disadvantageous conditions are fitted by the analysis and arrangement of field measured data. At the same time, the ansys software is used to simulate the supporting engineering by finite element method, according to the relevant rules about temperature in the general bridge code of our country. The temperature effect of steel-concrete composite deck system of long-span suspension bridge under different working conditions is analyzed in combination with field measured data, and the influence of longitudinal and transverse temperature gradient of steel truss stiffened beam on the temperature stress of composite deck system is emphatically discussed. The results show that the effect of temperature on the composite deck system is very significant, and that the transverse temperature difference of steel truss beam has a great effect on the temperature stress of composite deck system, which should be considered in design, but the longitudinal temperature difference has little effect on it and can be ignored.
【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】：U441.5;U448.25

【参考文献】