CAJ | 학술논문

提出了一种混凝土框架梁负弯矩区受弯性能加固的L形FRP片材粘贴加固法，该方法利用角钢实现FRP在梁柱阴角处的转向锚固。通过6个足尺框架梁柱边节点试件的单向静力加载和低周反复加载试验，对比了利用L形FRP粘贴加固法和规范建议FRP粘贴加固法加固后梁的破坏形态、受弯承载力、刚度、延性、耗能能力等性能指标。试验结果表明，粘贴L形FRP片材加固后，梁根部FRP与试件相应位置截面在加载过程中变形协调，应变关系基本符合平截面假定。低周反复荷载作用下，梁受弯承载力和刚度的提高幅度与静力荷载作用下几乎相同，表明L形FRP粘贴加固法中的锚固装置完全限制了阴角处FRP片材从被加固体基面上法向剥离的位移趋势，使得加固效果更加稳定。
제출료일충혼응토광가량부만구구수만성능가고적L형FRP편재점첩가고법，해방법이용각강실현FRP재량주음각처적전향묘고。통과6개족척광가량주변절점시건적단향정력가재화저주반복가재시험，대비료이용L형FRP점첩가고법화규범건의FRP점첩가고법가고후량적파배형태、수만승재력、강도、연성、모능능력등성능지표。시험결과표명，점첩L형FRP편재가고후，량근부FRP여시건상응위치절면재가재과정중변형협조，응변관계기본부합평절면가정。저주반복하재작용하，량수만승재력화강도적제고폭도여정력하재작용하궤호상동，표명L형FRP점첩가고법중적묘고장치완전한제료음각처FRP편재종피가고체기면상법향박리적위이추세，사득가고효과경가은정。
The L-shaped fiber reinforced polymer ( FRP) bonding method for enhancing the flexural performance of negative mome nt region of RC beams is proposed, in which angle steel is es ttled to anchor FR P sheet at the frame joint.Six full scale frame oj int specimens were tested under statci load ro ol w frequency cyclic load.Then, the failur e mode, flexural capacity, stiffnes , ducit lity and en-eryg id ssipation ability weer comparedb etween the RC beams strengthened by the proposed L-shaped FR P bonding method and those strengthened by the recommended method in current specification. The experimental results showt hat by theL -shaped FRP bonding method, deformation coordination between the FRP at the beam root and teh corresponding section of the frame beam are achieved in the process of loading, and thus the strse s-strain relationship basically agrees with the plane cross-section assumption.Under low frequency cyclic load, the increase of flexural capacity and stif ness of the beam are alm ost the same as those under the action fo static loads.The trend of FRP debond-ing vertically from the surface of concrete can be completely restricted by the anchor device and thus more stable strengthening effect is achieved.