混杂纤维增强RPC加固混凝土梁抗弯性能

发布时间：2018-04-30 18:39

本文选题：活性粉末混凝土 + 超高性能混凝土　；参考：《哈尔滨工程大学学报》2015年09期

【摘要】：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。
[Abstract]:In order to study the reinforcement effect of hybrid fiber reinforced active powder concrete (HFRPC), a test and theoretical study on bending resistance of ordinary reinforced concrete beams strengthened with high strength reinforcement HFRPC was carried out. Compared with the unreinforced beam, 7 beams were tested, of which 1 were unreinforced and 6 were HFRPC reinforced beams. The change parameters were HFRPC thickness, HF RPC and the old concrete interface bonding method and adhesive fiber cloth etc. test results show that the use of high strength reinforcement HFRPC reinforcement beam can effectively improve the bending bearing capacity, HFRPC reinforcement layer and old concrete bond firmly, without debonding damage; the number of cracks in the HFRPC reinforcement layer is numerous, the width is obviously reduced, the old concrete surface by chisel treatment than chisel ditch. The reinforced beam has greater bearing capacity, and high strength steel in HFRPC can give full play to the advantages of high strength steel. The thickness of HFRPC reinforcement is 40 mm to 30 mm beam, and the bending bearing capacity of the beam is increased by 5%. The flexural crack can be restrained by the use of fiber cloth hoop, which can prevent the expansion of the bending crack and the bearing capacity after the peak load is slow. Finally, the cracking load of the reinforced beam is given and yield is given. Yield yield is given. The calculated values of load and ultimate bearing capacity agree well with the test results.

【作者单位】：北京工业大学工程抗震与结构诊治北京市重点实验室;
【基金】：国家自然科学基金资助项目(51378032) 教育部博士点基金资助项目(20131103110017) 北京自然科学基金资助项目(8142005)
【分类号】：TU375.1

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