钢筋混凝土烟囱预应力环箍加固效应研究  

EFFECTS OF STRENGTHENING REINFORCED CONCRETE CHIMNEYS WITH PRESTRESSED HOOPS

作　　者：易贤仁[1] 陶高梁[2] 胡在良[2] 

机构地区：[1]武汉理工大学工程结构与力学系,武汉430070 [2]武汉理工大学土木工程与建筑学院,武汉430070

出　　处：《工程力学》2006年第4期109-113,共5页Engineering Mechanics

摘　　要：钢筋混凝土烟囱经预应力环箍加固后,在烟囱筒壁外表面与环箍接触处产生了一周沿环向均匀分布的径向压力。用圆柱壳理论导出了径向压力在筒壁中产生的环向压力、环向压应力、压力影响高度的计算公式,环向压应力呈曲线分布。数例计算结果表明:环向压应力值在环箍作用处最大,约为-1.0MPa,且随着环箍位置增高而增大,在压力影响高度起止点处衰减为零;压力影响高度随着环箍位置增高、半径变小而减小,平均值约为2.8m;根据压力影响高度,即可计算上下两道环箍之间的合理距离。When reinforced concrete chimneys is strengthened with prestressed hoops, uniformly distributed radial pressures can be generated on interfaces. Based on cylindrical shell theory, the calculating formulas of circumferential pressures, circumferential stresses and pressure influence height on chimney tube generated by radial pressure are obtained. The numerical results show that the distribution of circumferential stress is curvalinear. Circumferential stress reaches the maximum, at about -1.0MPa, on the belt in contact with the hoop. It increases with the rise of hoop position, and decreases to zero at the start-stop point of pressure influence height. The pressure influence height decreases with the rise of hoop position and the reduction of hoop radius, thc average value of which is 2.8m. The reasonable hoop distance can be obtained according to pressure influence height.

关 键 词：钢筋混凝土烟囱 预应力环箍加固 环向压力 环向压应力 压力影响高度 

分 类 号：TU375[建筑科学—结构工程]