体外预应力CFRP筋混凝土梁正截面抗弯试验研究  

Experimental study on flexural behaviour of concrete beams prestressed with external CFRP tendons

作　　者：王新定[1] 戴航[2] 丁汉山[2] 叶见曙[1] 

机构地区：[1]东南大学交通学院,南京210096 [2]东南大学土木学院,南京210096

出　　处：《东南大学学报（自然科学版）》2009年第3期557-562,共6页Journal of Southeast University：Natural Science Edition

摘　　要：为研究体外预应力CFRP筋混凝土结构的正截面抗弯特性,研制了CFRP后张预应力筋夹片式锚具,对1片体外CFRP筋直线布置体外预应力混凝土梁和2片体外CFRP筋曲线布置体外预应力混凝土梁进行了正截面抗弯试验研究.试验结果表明:体外预应力CFRP筋混凝土梁受力过程与体外预应力钢筋混凝土梁有较多相似之处;跨中设一转向块的体外预应力CFRP筋混凝土梁的开裂荷载和极限承载力均比不设转向块的体外预应力CFRP筋混凝土梁要大,而跨中极限挠度则比不设转向块的体外预应力CFRP筋混凝土梁要小.在跨中设置转向块,可有效提高体外预应力CFRP筋混凝土梁的极限抗弯承载能力.按所推导的体外预应力CFRP筋混凝土梁的极限抗弯承载力理论公式,计算值与试验实测值吻合良好.In order to study the flexural behaviour of concrete structures prestressed with external carbon fiber reinforced polymer（CFRP） tendons, a new wedge-shaped anchor for the CFRP post-tensioning prestressing tendon was developed. The flexural behaviour of a concrete beam prestressed with external CFRP tendons without any deviator and two concrete beams with a single deviator provided at midspan was carried out. The experimental results show that the flexural behaviour of concrete beams prestressed with external CFRP tendons is similar to that with external steel tendons in many aspects; the cracking load and the ultimate load carrying capacity of concrete beams prestressed with external CFRP tendons with a single deviator provided at midspan are higher than those without any deviator, while the ultimate deflection at midspan is lower. The ultimate flexural load carrying capacity of concrete beams prestressed with external CFRP tendons is increased by using a single deviator provided at midspan. Theoretical calculations based on the proposed formula are in good agreement with the experimental results with regard to the ultimate flexural load carrying capacity of concrete beams prestressed with external CFRP tendons.

关 键 词：CFRP筋 体外预应力 抗弯试验 承载力 

分 类 号：TU528[建筑科学—建筑技术科学]