热贮料作用下浅圆筒仓温度效应研究

THERMAL EFFECTS OF HIGH TEMPERATURE STORED MATERIALS ON SHALLOW CYLINDRICAL SILOS

为了研究热贮料对筒仓位移及内力的影响并方便设计时计算由热贮料产生的温度效应,本文推导了热贮料作用下仓壁位移和内力的计算公式,并通过数值模拟验证了公式的准确性。利用所推导公式分析了竖向温差对钢筒仓和内外、竖向温差对混凝土筒仓的影响。结果表明竖向温差使钢筒仓在冷热贮料交界面附近的仓壁出现较大的径向位移差;并导致温度应力显著增大;该温度应力随着径厚比的减小而增大。内外温差使混凝土筒仓上端产生较大的周向拉力;竖向温差也使筒仓中部的周向力增大;且径厚比对周向力的影响与钢筒仓相似。

In order to analyze the thermal effects of high temperature stored materials on silos, the formulations determining internal forces and displacements of shallow cylindrical silos infilled with high temperature stored materials were derived, and the accuracy of these formulations were demonstrated by numerical methods. Thermal effects induced by high temperature stored materials on steel and concrete silos were analyzed by the formulations respectively. The results show that vertical temperature differences lead to significant radial displacement variations and stress increments in the vicinity of the interface between cooler and hotter stored materials in steel silos, and these stresses increasing with the decrease of the radius to thickness ratio of the silo. Radial temperature differences in concrete silo walls cause large circumferential tension at the top of the silos, while vertical temperature differences raise significant circumferential forces in the middle of the silos. These thermal effects on concrete silos also increase with the decrease of the silo radius to thickness ratio.