近表面钢丝绳加固钢筋混凝土梁在反复荷载作用下的扭转性能

Q3 Environmental Science Tikrit Journal of Engineering Sciences Pub Date : 2022-12-25 DOI:10.25130/tjes.29.4.9
Israa Kh. Jasim, Mazin B. Abdulrahman, Muyasser M. Jomaa’h, Belal Alsubari, H. S. Abdulaali, S. Alqawzai
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引用次数: 0

摘要

由于梁的横截面突然发生变化,开口的存在对梁的强度产生负面影响,因此它们作为一个弱点,因此有必要对梁进行加强,以抵抗开口的影响并提高梁的强度,特别是如果梁受到重复载荷,因为它对强度的影响。本文研究了开孔对反复荷载作用下的梁的影响,确定了用NSM技术加固后梁强度的增加程度。试验方案包括铸造和测试15根RC梁,其中6根被认为是控制梁(3根加强,3根不加强),其中9根在不同位置有圆形横向开口,并通过NSM技术进行加强。每种类型的梁在三种不同的荷载下进行了测试(单调、恒定重复荷载和增量重复荷载)。所有的梁都有相同的尺寸和相同的钢筋。结果表明:所有带横向开口的梁都受到重复荷载的影响,极限扭矩减小,扭转角增大;孔洞的存在对降低极限扭矩有显著的影响,在孔洞位置离支座最近(净跨的四分之一处)且持续重复荷载作用下,梁的极限抗扭能力降低率达到43.83%,而当孔洞位置远离支座时,极限扭矩显著提高。与未加固梁相比,加固梁的存在减小或消除了开口对极限扭矩的影响。
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Torsional Behavior of RC Beams with Transverse Openings Strengthened by Near Surface Mounted-Steel Wire Rope Subjected to Repeated Loading
 The presence of the openings negatively effects on the strength of the beams where they act as a weak point because of the sudden change in the cross-section of the beam, so it becomes necessary to make strengthening for the beams to resist the effect of the openings and improve the strength of the beams, especially if the beams are subjected to repeated loads because of its effect on the strength at the failure. This paper studies the effect of the openings on the beams subjected to repeated loading and determine the extent of the increase in the strength of the beams when strengthened by the NSM technique. The experimental program included casting and testing fifteen RC beams, six of them considered as a control beams (three with strengthening and three without strengthening), and nine of them having circular transverse openings in different locations and strengthened by the NSM technique. Every type of beams is tested under three different types of loads (monotonic, constant repeated load, and incremental repeated load). All of the beams have the same dimensions and same reinforcement. The results show that all the beams with transverse openings are affected by repeated loads where the ultimate torque decreases and the twist angle increases. The existence of openings has a noted effect on reducing the ultimate torque, whereas the percentage of decrease in the ultimate torsional capacity reached 43.83% at the beam where the opening location is closest to the support (at the quarter of the clear span) and subjected to constant repeated loads, and the ultimate torque is significantly improved when the opening position is moved away from the supports. Also, the existence of strengthening reduced or eliminated the influence of openings on the ultimate torque compared with related non- strengthened beams.
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CiteScore
1.50
自引率
0.00%
发文量
56
审稿时长
8 weeks
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