巨型贮煤筒仓在环境温度作用下的有限元分析

本文对一直径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最大环向应力约大6倍;降温时仓壁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所引起的仓壁竖向应力差别不太大.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.

Finite element analysis of giant reinforced concrete coal silos subject to temperature load

The actions and effects of temperature loads on giant reinforced concrete circular coal silos are not precisely specified in technical references and relevant standards of design.The present paper investigates the structure behavior of a reinforced concrete circular coal silo(with 120 meters diameter and 100 kilo-tons volume weight) subjected to temperature loads.The stress state of the silo wall in the empty silo and fully laden silo when the temperature is ascending and descending is investigated and compared with that of the silo on stored material pressure.The investigation reveals that temperature load have a great effect on the stress state in the silo.The annual stresses in the wall of the silo caused by temperature load are six times larger than that caused by the stored material pressure.The annual stresses when the temperature step down,are much larger compared with the situation of temperature go up.The vertical stress in the silo wall are not obviously influenced by temperature load or material pressure.After analyzing the code for design of reinforced concrete silos,several advices are finally presented which are very important to the design and practice of reinforced concrete silos.