CAJ | 학술논문

为了研究混杂纤维增强活性粉末混凝土(HFRPC)的加固效果,进行了高强钢筋HFRPC加固普通钢筋混凝土梁抗弯性能的试验和理论研究,并与未加固梁比较. 共完成7根梁抗弯试验,其中1根是未加固梁,6根为HFRPC加固梁. 变化参数为:HFRPC厚度、HFRPC与旧混凝土界面粘结方式和粘贴纤维布等. 试验结果表明:采用高强钢筋HFRPC加固梁能有效提高抗弯承载力,HFRPC加固层与旧混凝土粘结牢靠,未发生脱粘破坏;HFRPC加固层裂缝数量众多、宽度明显减小;旧混凝土表面经凿坑处理比凿沟处理的加固梁承载力更大;HFRPC中配置高强钢筋,能发挥高强钢筋优势;HFRPC加固层厚度40 mm比30 mm梁抗弯承载力提高5%;采用纤维布箍约束新旧混凝土,可阻止弯曲裂缝扩展,峰值荷载后承载力下降较慢. 最后,给出了加固梁开裂荷载、屈服荷载和极限承载力计算公式,计算值与试验结果吻合较好.
위료연구혼잡섬유증강활성분말혼응토(HFRPC)적가고효과,진행료고강강근HFRPC가고보통강근혼응토량항만성능적시험화이론연구,병여미가고량비교. 공완성7근량항만시험,기중1근시미가고량,6근위HFRPC가고량. 변화삼수위:HFRPC후도、HFRPC여구혼응토계면점결방식화점첩섬유포등. 시험결과표명:채용고강강근HFRPC가고량능유효제고항만승재력,HFRPC가고층여구혼응토점결뢰고,미발생탈점파배;HFRPC가고층렬봉수량음다、관도명현감소;구혼응토표면경착갱처리비착구처리적가고량승재력경대;HFRPC중배치고강강근,능발휘고강강근우세;HFRPC가고층후도40 mm비30 mm량항만승재력제고5%;채용섬유포고약속신구혼응토,가조지만곡렬봉확전,봉치하재후승재력하강교만. 최후,급출료가고량개렬하재、굴복하재화겁한승재력계산공식,계산치여시험결과문합교호.
In order to study the retrofitting effects of hybrid fiber reinforced reactive powder concrete ( HFRPC) ,the flexural behaviour of reinforced concrete ( RC) beams reinforced with HFRPC was investigated by experiment and theory, then compared with reinforced concrete beams without retrofitting. Seven test beams were designed and made, one of which was not retrofitted, while the other 6 were retrofitted with HFRPC. The test variables include thickness of HFRPC, HFRPC and concrete interfacial bonding method, retrofitting fiber, and so on. The test re-sults show that the reinforced concrete beam strengthened with HFRPC exhibits improved bearing capacity and de-creased deformation. The HFRPC retrofitting layer bonds well with concrete, no debonding failure happens. While there are numerous cracks on the HFRPC reinforcement layer, crack width is significantly decreased.Gouged beams have larger bearing capacity than those with troughs. The superior performance of high-strength steel set in HFRPC is fully utilized. Beams with a 40 mm thickness retrofitting layer have larger capacity than 30 mm beams, about 5%better flexural performance. Adopting fiber cloth wraps to retrofit new and old concrete beams can effectively prevent crack propagation, and thus slowing down loss of ultimate load bearing capacity. Through theoretical analysis, a for-mula for the calculation of HFRPC beam crack load, yield load, and ultimate load is provided. Finally,the experi-mental results match well with the theoretical predictions.