网架模型日照非均匀温度场试验

为得到日照下空间钢结构非均匀温度场分布规律,给现有非均匀温度场模拟方法提供标准、可靠的试验验证依据,设计并制作了标准的三角形平板网架模型,对其均匀温度场试验进行了详细设计,完成了不同环境下三角形平板网架非均匀温度场的连续测量,得到了较为全面的网架结构非均匀温度场试验数据,并对其进行了详细分析,结果表明,网架结构杆件水平放置时,摆放角度对杆件温度变化影响不大,非水平放置时,摆放角度影响较大,不同杆件间温差最大可达13℃,网架模型非均匀温度场效应明显;最后建立了三角形平板网架非均匀温度场有限元分析模型,采用考虑阴影的数值模拟方法对试验进行模拟分析,并将模拟结果与实测结果进行对比,试验结果与数值模拟结果基本相同,全天平均误差率不超过6%.考虑阴影遮挡的非均匀温度场模拟方法可用于结构非均匀温度场分析,模型试验可为同类非均匀温度场模拟方法提供验证依据.

Experimental study on non-uniform temperature field of grid structure model under solar radiation

To obtain the temperature distribution rules of steel structures under solar radiation and offer standard reference and reliable basis for related numerical research, temperature field test of a specially designed triangle space truss model was carried out under various conditions. Through the continuous measurements, abundance experimental data and distribution rules were obtained and analyzed in detail. According to the comprehensive test results, solar temperature distribution rules under different conditions were summarized initially. Laying angle has a great influence on temperature field of members in non-horizontal location, while it has little influence on horizontal ones, and the maximum temperature difference between different members can reach 13 centigrade. Then numerical simulation for solar temperature field of the test model was conducted contrastively considering the shadow effect. The results show that test results and simulation results are almost the same, in which the average error rate is not more than 6%. The proposed simulation methods are effective for structural non-uniform temperature field analysis, and the experimental study and conclusions can provide valuable references for other similar analysis methods of temperature field.