国家体育场大跨度钢结构温度场分析与合拢温度研究  

Analysis on temperature field and determination of temperature upon healing of large-span steel structure of the National Stadium

作　　者：范重[1] 王喆[1] 唐杰[1] 

机构地区：[1]中国建筑设计研究院,北京100044

出　　处：《建筑结构学报》2007年第2期32-40,共9页Journal of Building Structures

基　　金：国家科技攻关计划课题(2004BA904B01)

摘　　要：结合国家体育场工程,对温度差异引起桁架结构的内力效应、太阳辐射吸收系数ρ的影响因素以及降低太阳辐射温升的措施进行了分析。通过分析统计得到结构各区域箱形构件的太阳辐射照度,合理地确定了温度场计算采用的各种参数及室内外风速及相应的热传导计算边界条件。采用有限元法计算了箱形构件各表面的辐射温度与构件的平均辐射温升,从而确定了“鸟巢”结构各区域内构件的辐射温度。明确提出大跨度屋盖结构的合拢与合拢温度要求,并根据历史气象温度记录与变化趋势、太阳辐射温升、结构设计的合理性以及结构施工的实际进程,综合确定在大跨度钢结构设计时采用的合拢温度与最大正、负温差。The paper analyzes internal force effect of truss structure caused by temperature difference, the factors affecting absorption coefficient ρ of solar radiation heat and measures for controlling temperature rise under the effect of solar radiation for the National Stadium project. Through analysis and survey, the data on solar irradiance for the box members in all regions of the structure is acquired. In addition, all parameters used for calculation of temperature field, indoor and outdoor wind speed and corresponding boundary conditions for thermal transmission calculation are determined rationally. Radiation temperature on the surface of box member and average temperature rise of the members under the effect of solar radiation are calculated with the finite element method, and thus the radiation temperature of the members in all regions of the ＂Bird＇ s nest＂ structure is determined. The requirements on healing and healing temperature for large-span roof structure are proposed expressly. Temperature upon healing and maximum positive, negative temperature difference adopted for the design of largespan steel structure are determined based on comprehensive considerations and according to historic record of meteorological temperature and change trends, temperature rise under the effect of solar radiation, rationality of structural design and progress of structural construction.

关 键 词：国家体育场 大跨度结构 温度应力 太阳辐射吸收系数 热传导计算 合拢 温差 

分 类 号：TU393.3[建筑科学—结构工程] TU318