无粘结预应力技术在大直径圆柱壳中的应用和问题探讨  

Application and Investigation of Unbonded Prestressed Technique on the Cylindrical Shell with Large Diameter

作　　者：侯和涛[1] 齐立新 汤红卫[3] 陈能礼[4] 

机构地区：[1]同济大学建筑工程系,上海200092 [2]济南市政工程设计研究院,250002 [3]山东大学力学工程系,济南250014 [4]上海市政工程设计研究院,200092

出　　处：《建筑结构》2005年第4期46-49,共4页Building Structure

摘　　要：利用轴对称圆柱壳有矩理论进行水池设计,并进行了现场测试。设计中预应力钢筋的摩擦损失取自现场试验数据,为张拉控制应力的1 9%。工程实例表明,无粘结预应力混凝土技术应用于大直径圆柱壳可有效地控制裂缝产生,获得可观的经济和社会效益。在使用阶段,建议对0 4倍池壁高度以下截面应按偏心受拉构件计算,以上截面仍按轴心受拉构件计算。底板下的锚桩除了有效抗浮之外,还能大大降低底板的厚度。施工时应保证钢绞线与锚固壁柱上的锚垫板垂直,并选用适当的夹片式锚具,使其表面硬度与钢绞线的表面硬度差≥HRc1 0 (HRc为洛氏硬度)。The design of water tank using the axisymmetrical cylindrical shell theory with moment and in situ tests are presented. The friction loss of the prestressing tendon in tests equals to 19 percent of the controlling axial tension stress. The application and test show that unbonded prestressed concrete technique used in cylindrical shell with large diameter can restrain the development of crack effectively, and its economic and social benefits are significant. The tank wall panels whose height from the top is greater than 40 percent of total height, are subjected to both flexure and axial tension, otherwise are subjected to pure tension. The anchor piles can prevent floatage of the tank, as well as decrease the thickness of the floor slab. In construction, the steel strand should be perpendicular to the plate embedded in the buttress panel. The differences of the surface hardness between the jaw vice anchorages selected suitably and the steel strand should not be less than HRc10(HRc means Rockwell hardness).

关 键 词：无粘结预应力技术 圆柱壳 大直径 无粘结预应力混凝土 张拉控制应力 构件计算 预应力钢筋 夹片式锚具 水池设计 有矩理论 现场测试 试验数据 摩擦损失 工程实例 控制裂缝 技术应用 社会效益 使用阶段 偏心受拉 轴心受拉 

分 类 号：TU378.8[建筑科学—结构工程] TU333.01