国家体育场钢结构温度与应力实测及分析

应用自主开发的基于无线传感网络的结构温度与应力实测系统，对国家体育场钢结构各部位的温度与应力进行长期实测。以全年实测数据为依据，分析结构温度分布规律，并根据结构温度场的非均匀性，将温度作用分为均匀温度场作用与非均匀温度场作用，分别详细研究均匀温度场作用与非均匀温度场作用对结构应力变化的影响。研究结果表明：结构不同部位之间存在明显的温差，且构件的温度与周围的气温并不一致；均匀温度场作用下结构产生显著的应力变化，且构件应力与温度的线性相关性较好；在结构的某些部位，非均匀温度场作用所引起的应力变化超过均匀温度场作用所引起的应力变化。

Field measurement of temperature and stress on steel structure of the National Stadium and analysis of temperature action

With the aid of self-developed wireless sensors of structural stress and temperature, long-term measurement of stress and temperature was applied to steel structure of the National Stadium. Based on the measured data, this paper analyzes the distribution of the temperature field, and according to the non-uniformity of the temperature field, the actions of temperature field consists of two parts, uniform and non-uniform. Then this paper studies the performance of the structure under temperature action, during which a comparison was made between the actions of uniform and non-uniform temperature field. With the measured data throughout a whole year, it is indicated that: 1) there is obvious difference between different parts of the structure, and also, the temperature of the structure differs from the air temperature; 2) the stress variation was notable under uniform temperature field action, and the member stress is linear to its temperature; 3) the non-uniform temperature field makes the stress variation grow larger. At some parts such as the top chords, stress variation caused by non-uniform temperature field is larger than that caused by uniform temperature field action.