套箍技术加固短柱的偏压性能

为研究套箍技术加固构件的偏压性能,进行了22个试件的力学性能试验,主要考察7种不同因素对构件破坏形态和承载能力的影响。结果表明:套箍加固构件的破坏形态与普通钢筋混凝土构件的基本相同,中间截面实际测试的开裂前应变基本符合平截面假定,表明新老混凝土能够共同工作;通过对试验中荷载—应变曲线的分析认为,在承载能力计算时新老钢筋和混凝土都能够达到其设计强度。基于钢筋混凝土结构设计的基本原理,结合现有加固设计规范,提出了考虑多种影响因素的套箍加固构件承载力的计算公式,并根据试验的实际情况进行了适当简化。通过简化后理论计算结果与试验结果的比较,验证了提出的计算公式的正确性和可靠性。

Eccentric Compression Performances of Hooping Technique Strengthening Short Columns

In order to research the eccentric compression performances of hooping technique strengthening member, mechanical behavior testings of 22 specimen have been completed. It aimed to investigate the influence of 7 different factors on the failure pattern and bearing capacity of the member. Test results indicated that the failure mode of hooping strengthening member was similar to that of common reinforced concrete member. The actual test strains of midsection before cracking basically complyed with the plane section assumption, which showed that the young-old concrete can work together. By analyzing the relationship curve of test load and strain, it can be inferred that the new-old reinforcement and concrete are able to reach its design strength in the calculation of carrying capacity. Based on the basic design principles of RC structure, and combined with the existing strengthening technical specifications, the formula for the bearing capacity of hooping strengthening member considered various influence factors was proposed. Then, the formula was duly simplified in the light of the actual situation of the test. Through the comparison between the simplified theoretical calculation results and test results, the correctness and reliability of the proposed formula were verified.