预应力碳纤维加固桥梁结构疲劳性能试验研究

Fatigue Performance Experimental Research of Pre-stress CFRP Reinforcing Bridge Structure

摘要:

通过对两组不同预应力水平碳纤维布加固梁分别进行单调静载试验与疲劳试验研究,考察了各级荷载作用下裂缝开展、应变和挠度的变化情况,并得到了开裂荷载、屈服荷载及极限荷载.结果表明:随着碳纤维布预应力水平的提高,裂缝宽度变小,长度变短,挠度也有较大程度的降低;开裂荷载,屈服荷载与极限荷载均有了不同程度的提高.

Abstract:

Humdrum static load experiment and fatigue experiment were made on two groups of carbon fiber,the carbon fiber reinforced with plastics and the carbon fiber reinforced with girder,under different pre-stress levels to investigate fatigue load of fatigue experiment girder and the expansion of crack under each load rank acting,the strain and displacement.And the crack load,yielding load and ultimate load are obtained.Results show that with the increasing of pre-stress level,width and length of the crack decrease.Meanwhile,the displacement decreases obviously too.The yielding load and the ultimate load and the ultimate load have different increments.