摘要
为研究自然环境下悬索桥太阳辐射效应变化规律以及最不利活载效应与环境温度效应的关系,首先建立了某在建大跨度悬索桥精细化模型,然后对太阳辐射效应的环境因素进行参数敏感性分析,同时研究了太阳辐射效应与最不利活载效应的关系.研究结果表明:悬索桥太阳辐射效应受环境温度影响最大、风速次之.风速对悬索桥太阳辐射效应的影响呈非线性关系;日序数和纬度对太阳辐射效应影响较小,但太阳辐射效应变化规律与纬度变化规律不一致,受多种环境因素影响.最不利活载引起的主梁跨中点挠度数值上是热辐射引起最大挠度的2倍,塔顶偏位数值上与热辐射引起的偏位相等.研究结果可以为悬索桥施工阶段误差分析和健康监测数据的温度影响剔除提供理论依据和技术支撑.
This research focuses on the change rules of solar radiation effects and the relationship between most unfavorable live load effect and temperature effect of suspension bridges under natural environment. The fine model of an under-construction long-span suspension bridge was established, the parameter sensitivity analysis of environmental factors of solar radiation effects was carried out, and the relationship between the solar radiation effects and the most unfavorable live load effect was investigated. Results showed that the solar radiation effects of suspension bridge were mainly affected by ambient temperature, followed by the wind speed, the influence of which is nonlinear. Daily ordinal number and latitude had little influence on the solar radiation effects. The change of solar radiation effects was not consistent with that of latitude, but was affected by many environmental factors. The maximum deflection of the main beam caused by the most unfavorable live load was twice the maximum deflection caused by thermal radiation, and the offset of the tower top was equal to that of thermal radiation. These results could provide theoretical basis and technical support for the error analysis of the construction phase of suspension bridges and eliminate the temperature influence of the health monitoring data.
作者
朱劲松
陈科旭
孟庆领
ZHU Jinsong;CHEN Kexu;MENG Qingling(School of Civil Engineering,Tianjin University,Tianjin 300072,China;Key Laboratory of Coast Civil Structure Safety (Tianjin University),Ministry of Education,Tianjin 300072,China)
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2019年第3期127-134,共8页
Journal of Harbin Institute of Technology
基金
天津市科技支撑计划重点项目(16YFZCSF00460)
天津市自然科学基金(16JCZDJC40300)
关键词
悬索桥
环境因素
太阳辐射
温度效应
最不利活载
suspension bridge
environmental factors
solar radiation
temperature effects
most unfavorable live load
