环境温度作用对巨型贮煤筒仓的内力影响分析

对一直径120m、容量达10万t的巨型钢筋混凝土贮煤筒仓在环境温度作用下进行有限元分析,分别研究了在空仓和满仓时,环境温度的升高和降低时仓壁的应力状态,并与贮煤侧压力作用时的应力状态进行比较分析。分析结果表明:环境温度降低时,仓壁中的最大环向应力比由贮料侧压力所引起的仓壁中的最大环向应力约大6倍;降温时仓壁中的最大环向应力是升温时的仓壁中的环向应力的7倍;环境温度作用所引起的仓壁竖向应力与由贮料侧压力作用所引起的仓壁竖向应力则差别不太大。最后分析了《钢筋混凝土筒仓设计规范》(GB 50077-2003)中的有关规定,提出了几点设计参考意见,可给类似工程设计提供参考。

EFFECTS OF TEMPERATURE LOAD ON GIANT REINFORCED CONCRETE COAL SILO

The actions and effects of temperature loads on giant reinforced concrete circular coal silo are not precisely specified in technical references and relevant standards of design.It is investigated the structure behavior of reinforced concrete circular coal silo(with a diameter of 120m and a capacity of 100 kilo-tons) subjected to temperature loads.The temperature loads individually assumed to act on the coal silo without nothing and fully laden silo.And compared the stress state of the silo on temperature load with that of the one on stored material pressure.The investigation reveals that temperature load has a great effect on the stress state of the silo;the annual stresses in the wall of the silo caused by temperature load are six times larger than that of the one caused by the stored material pressure;when the temperature steps down,the annual stresses are much larger as compared with the situation of temperature goes up;the axial stress in the wall of the silo is not so obviously influenced by temperature load or by material pressure.Finally,after analyzing "The Code for Design of Reinforced Concrete Silos"(GB 50077-2003),several advices are presented which are very important to the design and practice of reinforced concrete silos.