环向预应力加固圆形混凝土筒仓的静力性能

为了研究环向预应力碳纤维条带加固钢筋混凝土筒仓在贮料荷载下的受力性能,本文主要考虑了有无预应力、预应力大小、材料厚度、宽度以及加固形式对加固效果的影响,对5种针对不同影响因素的加固模型进行对比分析．结果表明:采用环向预应力加固钢筋混凝土筒仓可有效限制仓壁径向位移和混凝土、钢筋应力,并改善其整体应力水平;预应力的施加可较大程度提高碳纤维条带中的应力,使其高强特性发挥更加充分;加固时,碳纤维材料的厚度宜为0.35～0.5 mm,预应力宜为其抗拉强度的10％～15％．

Static behavior of circular reinforced concrete silo strengthened with lateral pre-stressed method

To study static behavior of circular reinforced concrete silo strengthened with pre-stressed carbon fiber reinforced polymer (CFRP) under stored material load, considering the influence of reinforcement parameters such as strengthening method, pre-stress level, width, thickness, and reinforcement form on reinforced effect, comparative analysis were performed between reinforcement models established according to 5 different influencing factors. The results show that lateral pre-stress could effectively restrict radial displacement,concrete and steel stress of silo wall and improve the stress level of silo wall. The lateral pre-stress can largely improve the damage stress of CFRP and bringing the high-strength characteristic of CFRP into full play. The thickness of CFRP should be from 0.35 mm to 0.50 mm and the pre-stress level should be from 10 to 15 percent of its ultimate tension strength.