体外预应力加固结构的二次效应分析  

SECOND-ORDER EFFECT ANALYSIS OF STRUCTURES STRENGTHENED WITH EXTERNAL PRESTRESSING TENDONS

作　　者：曾滨[1] 尚仁杰[1] 许庆[1] ZENG Bin;SHANG Renjie;XU Qing(Central Research Institute of Building and Construction Co.,Ltd.,MCC Group,Beijing 100088,China)

机构地区：[1]中冶建筑研究总院有限公司

出　　处：《工业建筑》2019年第12期96-99,104,共5页Industrial Construction

基　　金：十三五国家重点研发计划项目(2018YFC0705703);中冶建筑研究总院有限公司重大课题(JAG2018ky01)

摘　　要：二次效应是体外预应力加固混凝土受弯构件时产生的重要特征,通过分析体外预应力加固后的受弯构件在承载力极限状态时的弯曲变形,揭示了承载力极限状态时预应力筋有效高度随转向块间距变化而变化的规律,研究了体外预应力筋极限应力与高跨比或转向块间距的关系,分析了二次效应对计算承载力的影响,并与相关试验结果进行了对比。结合JGJ/T 279-2012《建筑结构体外预应力加固技术规程》,给出了体外预应力加固混凝土受弯构件的设计方法和构造要求。Second-order effect is an important characteristics of concrete structures strengthened with external prestressing tendons. The bending deformation of flexural members strengthened with external prestressing tendons in the ultimate state of bearing capacity was analyzed and the changing rules between effective height of prestressing tendons and the distance between steering blocks were revealed. The relationship between ultimate stress of external prestressing tendons and span height ratio or distance between steering blocks was studied. The bearing capacity considering the change of the effective height of prestressing tendons and the ultimate stress of prestressing tendons were analyzed. The results were compared with the relevant tests. Combined with the Technical specification for strengthening building structures with external prestressing tendons(JGJ/T 279-2012), the design methods and structural requirements of concrete flexural members strengthened with external tendons were proposed.

关 键 词：体外预应力筋 加固 二次效应 极限应力 

分 类 号：TU37[建筑科学—结构工程]