Strengthening of short splices in RC beams using Post-Tensioned Metal Straps

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• 作者：Yasser Helal ; Reyes Garcia ; Kypros Pilakoutas…
• 关键词：Lap splice ; Seismic strengthening ; RC beams ; Bar slip ; Confinement ; Post ; Tensioned Metal Straps
• 刊名：Materials and Structures
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：49
• 期：1-2
• 页码：133-147
• 全文大小：3,518 KB
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• 作者单位：Yasser Helal (1)
  Reyes Garcia (1)
  Kypros Pilakoutas (1)
  Maurizio Guadagnini (1)
  Iman Hajirasouliha (1)
  
  1. Department of Civil and Structural Engineering, The University of Sheffield, Sir Frederick Mappin Building, Mappin Street, Sheffield, S1 3JD, UK
  
• 刊物类别：Engineering
• 刊物主题：Structural Mechanics
  Theoretical and Applied Mechanics
  Mechanical Engineering
  Operating Procedures and Materials Treatment
  Civil Engineering
  Building Materials
  
• 出版者：Springer Netherlands
• ISSN：1871-6873

文摘

This paper investigates the effectiveness of a novel and cost-effective strengthening technique using Post-Tensioned Metal Straps (PTMS) at enhancing the bond behaviour of short lap spliced steel bars in reinforced concrete (RC) beams. Twelve RC beams with a short lap splice length of 10d _b (d _b = bar diameter) at the midspan zone were tested in flexure to examine the bond splitting failure. The effect of confinement (no confinement, internal steel stirrups or external PTMS), bar diameter and concrete cover were examined. The results show that, whilst unconfined control beams failed prematurely due to cover splitting, the use of PTMS confinement enhanced the bond strength of the spliced bars by up to 58 % and resulted in a less brittle behaviour. Based on the test results, a new analytical model is proposed to predict the additional bond strength provided by PTMS confinement. The model should prove useful in the strengthening design of substandard lap spliced RC elements.