天津市典型日光温室和塑料大棚雪荷载分布

Distribution of Snow Load above Typical Solar Energy Greenhouse and Plastic Tunnel in Tianjin

利用天津市13个国家气象观测站1951-2018年逐年最大积雪深度极值数据,采用极值Ⅰ型概率分布法,计算了天津市不同重现期的基本雪压和典型日光温室和塑料大棚雪荷载值. 结果表明:10年、15年和20年重现期的基本雪压计算值与规范值相比较,除了宝坻20年重现期基本雪压高于规范值0.1kN/m2 以外,其余所有计算值均小于规范值;天津市典型日光温室雪荷载10年、15年和20年重现期雪荷载范围为0.11~0.28kN/m2,常见圆拱落地式塑料大棚雪荷载范围为0.06~0.12kN/m2;区域分布上两者均以宝坻、宁河和汉沽为雪荷载较大值区,而西青、津南和大港为相对较小值区.

Based on the annual maximum snow depth data of 13 national meteorological observation stations in Tianjin from 1951 to 2018,we calculated the basic snow pressure and the snow load above the typical solar energy greenhouse and the plastic tunnel in different return periods in Tianjin by using the extreme value type I probability distribution method.The calculation results show that,the calculated values of basic snow pressure are all less than the standard values in 10-year,15-year and 20-year return periods except that the basic snow pressure in Baodi is 0.1 kN/m^2 in 20-year return period,which is higher than the standard value.The snow load of the typical solar energy greenhouse in Tianjin is 0.11-0.28 kN/m^2 in 10-year,15-year and 20-year return periods,and that of the common circular arch plastic tunnel is 0.06-0.12 kN/m^2.The snow load values of the typical solar energy greenhouse and the plastic tunnel in Baodi,Ninghe and Hangu area are lager,and that in Xiqing,Jinnan and Dagang is relatively small.