登录
注册
E-alert
登录
注册
E-alert
An Experimental Study on Flexural Property of Damaged Concrete Beams Reinforced with High Ductile Concrete
-
摘要: 高延性混凝土（HDC）具有良好的延性、黏结性能和耐损伤性能，利用其加固受损混凝土梁不仅能提高梁的承载力还能阻止其裂缝的进一步发展。使用HDC进行面层加固，对5个HDC加固震损混凝土梁进行受弯性能试验，研究HDC加固震损混凝土梁的承载能力和变形能力及混凝土内部损伤情况。试验结果表明：利用HDC加固的震损混凝土梁承载力和变形能力较加固前得到了大幅度提高，RCL1~RCL5加固后承载力分别提高86.1%、75.7%、56.0%、84.4%和65.7%；其初始裂缝对应荷载分别提高36.4%、86.6%、64.3%、28.9%和29.7%。HDC加固震损混凝土梁破坏前后对比，表明HDC发挥了良好的黏结性能和耐损伤性能，原有混凝土和HDC能够共同受力，协同变形。基于HDC加固震损混凝土梁的受弯性能研究，给出了HDC加固震损混凝土梁受弯承载力计算公式，计算结果与试验结果相吻合。Abstract: High ductile concrete (HDC) has positive ductility, bond property, and damage resistance feature. Therefore, it can be used to reinforce damaged concrete beams, which can not only improve the bearing capacity of the beams, but also prevent the further development of cracks. This paper used HDC for surface reinforcement, tested the flexural property of five earthquake-damaged concrete beams reinforced with HDC, and studied the bearing and deformation capacity of the earthquake-damaged concrete beams reinforced with HDC, as well as the internal damage of the concrete. The experimental results show that the bearing capacity and deformation capacity of the earthquake-damaged concrete beams reinforced with HDC are greatly improved. The bearing capacity of reinforced RCL1-RCL5 is increased by 86.1%, 75.7%, 56.0%, 84.4%, and 65.7%, respectively, and the corresponding load of the initial crack is increased by 36.4%, 86.6%, 64.3%, 28.9%, and 29.7%, respectively. By comparing the earthquake-damaged concrete beams reinforced with HDC before and after the failure, this paper finds that HDC has shown positive bond and damage resistance properties, and both the original concrete and HDC are subjected to forces and deform. According to the study on the flexural property of earthquake-damaged concrete beams reinforced with HDC, the calculation formula of the flexural capacity of the earthquake-damaged concrete beams reinforced with HDC is deduced, and the calculated results agree with the experimental ones.
-
[1] 叶列平,陆新征,赵世春,李易.框架结构抗地震倒塌能力的研究-汶川地震极震区几个框架结构震害案例分析[J].建筑结构学报,2009,30(6):67-76. [2] ESMAEELI E,MANNING E,BARROS J.Strain hardening fibre reinforced cement composites for the flexural strengthening of masonry elements of ancient structures[J].Construction and Building Materials,2013,38:1010-1021. [3] LI J, HADI M N S. Behaviour of externally confined high-strength concrete columns under eccentric loadings[J].Composite Structures, 2003,62(2):145-153. [4] BRUCKNER A, ORTLEPP R, CURBACH M. Anchoring of shear strengthening for T-beams made of textile reinforced concrete(TRC)[J].Materials and Structures, 2008, 41(2):407-418. [5] 于天来,李海生,黄巍,等.预应力钢丝绳加固钢筋混凝土梁桥抗剪性能[J].吉林大学学报(工学版),2019,49(4):1134-1143. [6] 刘阳,陈海,郭子雄,等.U形预应力钢板箍加固T形截面钢筋混凝土梁受剪性能试验研究[J].建筑结构学报,2019,40(9):113-121. [7] 陈爱玖,韩小燕,杨粉,等.预应力碳纤维布加固钢筋再生混凝土梁受弯承载力研究[J].土木工程学报,2018,51(11):104-112. [8] 邓明科,李彤,樊鑫淼.高延性混凝土加固砖柱轴压性能试验研究[J].工程力学,2019, 36(5):92-99. [9] 寇佳亮,景国强,张浩博,等.HDC加固破损混凝土短柱受压性能试验及承载能力研究[J].应用力学学报,2020,37(3):1212-1217. [10] 邓明科,李琦琦,马福栋,等.高延性混凝土加固RC梁抗剪性能试验研究[J].工程力学,2020,37(5):55-63. [11] 邓明科,潘姣姣,韩剑,等.高延性混凝土加固剪力墙抗震性能试验研究[J].建筑结构学报,2019,40(11):45-55. [12] LI V C, LEUNG C K Y. Steady state and multiple cracking of short random fiber composites[J]. Journal of Engineering Mechanics, ASCE, 1992, 188(11):2246-2264. [13] LI V C. On engineered cementitious composites (ECC) -a review of the material and its applications[J]. Journal of Advanced Concrete Technology, 2003, 1(3):215-230. [14] 中华人民共和国住房和城乡建设部. 混凝土结构设计规范:GB 50010-2010[S]. 北京:中国建筑工业出版社, 2010. [15] 中华人民共和国住房和城乡建设部. 混凝土结构加固设计规范:GB 50367-2013[S]. 北京:中国建筑工业出版社, 2013. [16] 项凯,余江滔,陆洲导,等.碳纤维布加固火灾后钢筋混凝土连续梁的试验研究[J].四川大学学报(工程科学版),2010,42(2):52-57. -
点击查看大图
计量
- 文章访问数: 61
- HTML全文浏览量: 16
- PDF下载量: 0
- 被引次数: 0
下载:
