摘要
进行了 6根玻璃纤维布 (GFRP)加固的钢筋混凝土梁梁端锚固试验和 3根对比梁的试验研究 .试验中变化的参数为混凝土强度等级、配筋率、加固量、剪跨比 .针对不同的加固层数采用了端部U型箍、剪跨区内U型箍、剪跨区内U型全包 3种梁端锚固形式 .分析了梁端锚固形式对玻璃纤维布加固的钢筋混凝土梁破坏形态及极限荷载的影响 .试验结果表明 ,经玻璃纤维布加固的钢筋混凝土梁抗弯承载力提高较多 ,加固效果明显 ,梁端有无锚固条对加固梁的极限荷载及破坏形态有显著影响 .对于剪跨比小的加固梁 ,梁端锚固条不仅可以防止发生剥离破坏 ,而且还改善了梁的延性 .
Six reinforced concrete (RC) beams strengthened with GFRP (glass fiber reinforced polymer) sheets and three control beams were tested to evaluate the validity of anchorage system at the end of GFRP sheets. Four parameters are considered in this experimental program; the concrete strength, the tension steel ratio, the number of GFRP sheets, and the shear span ratio. Different anchorage schemes are conducted according to the number of GFRP sheets. The effect of anchorage schemes on the failure modes and ultimate load capacity of the RC beams strengthened with GFRP sheets are discussed. The results indicate that the flexural strength of the repaired beams is increased and the effect of anchorage schemes on the ultimate load capacity of the RC beams strengthened with GFRP sheets is obvious. Anchorage schemes can not only prevent the GFRP sheets from debonding but also improve the ductility of strengthened beams with low shear span ratio.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2004年第5期656-660,共5页
Journal of Southeast University：Natural Science Edition
关键词
玻璃纤维布
加固
钢筋混凝土梁
梁端锚固
试验研究
Anchorages (concrete construction)
Ductility
Glass fiber reinforced plastics
Reinforced concrete
Strengthening (metal)
