竖张双折线体外预应力加固RC梁抗裂分析  

Cracks Resistance Analysis on External Prestressed Reinforced RC Beams with Double Broken Line by External Vertical Tension

作　　者：郭波[1] 李峻峰[1] 颜燕祥 王天稳[1] 

机构地区：[1]湖北工程学院土木工程学院,孝感432000

出　　处：《混凝土与水泥制品》2017年第5期41-45,共5页China Concrete and Cement Products

摘　　要：采用体外预应力竖向张拉双折线布筋加固方法,对2根对比梁和9根不同体外预应力配筋率、不同工况下矩形钢筋混凝土简支梁进行了抗弯性能试验研究。试验结果表明,采用体外预应力加固RC梁可以显著提高其极限承载力和抗裂能力。在试验结果基础上,运用应力图形分解法,结合内力及力矩平衡,推导了体外预应力混凝土矩形截面梁开裂弯矩的简化计算公式,且计算值与试验值吻合良好。The external prestressing vertical tensioning method with double broken line is used to test the flexural behavior of eleven reinforced concrete beams （two contrast beams and nine externally reinforced beams with different prestressed reinforcement ratio and reinforced conditions）. The results show that the use of RC beams strengthened by external prestressing could significantly improve the bearing capacity and crack resistance of beams. A simplified formulas of crack resistance equation of externally prestressing reinforced rectangle beam is derived from balance method of the internal forces and moment. The calculated values are in good agreement with the experimental value, which could provide a good reference for crack analysis of rectangluar RC beams by externally prestressed reinforcement.

关 键 词：体外预应力 双折线布筋 加固方法 抗裂性能 

分 类 号：TU378.1[建筑科学—结构工程]