TA project: BANDIT

Click here and here to watch two videos from the BANDIT tests.

Click here to read the final report of the BANDIT Project.

A concise presentation of the project’s aim and main outcomes is available at SERIES' TA joint brochure.

TITLE OF PROPOSAL: Seismic Strengthening of Deficient RC Buildings Using Ductile Post‐Tensioned Metal Strips

HOST TA FACILITY: 
CEA, Saclay, France

TA AGREEMENT BETWEEN USERS AND FACILITY:
Signed on April, 19th 2010

STARTING DATE:
March, 9th 2010 (kick off meeting)

END DATE:
December 2012

NO. OF USERS (researchers):
19

LEAD USER: 
Kypros Pilakoutas - University of Sheffield (UK)

PROJECT ENGINEER COORDINATOR:
Reyes Garcia Lopez - University of Sheffield (UK)


ADDITIONAL USERS:
Mihail Petkovski - University of Sheffield (UK)
Iman Hajirasouliha - University of Sheffield (UK)
Maurizio Guadagnini - University of Sheffield (UK)
Mihaela Anca Ciupala - University of East London (UK)
Nahit Kumbasar - Istanbul Technical University (Turkey)
Zekai Celep - Istanbul Technical University (Turkey)
Alper Ilki - Istanbul Technical University (Turkey)
Ercan Yuksel - Istanbul Technical University (Turkey)
Nicolae Taranu - Technical University “Gheorghe Asachi” of Iasi (Romania)
Mihai Budescu - Technical University “Gheorghe Asachi” of Iasi (Romania)
Ionut Ovidiu Toma - Technical University “Gheorghe Asachi” of Iasi (Romania)
Lluis Torres - University of Girona (Spain)
Albert Turon - University of Girona (Spain)
Cristina Barris - University of Girona (Spain)
Marta Baena - University of Girona (Spain)
M. "Saiid" Saiidi - University of Nevada, Reno (US)
Christis Chrysostomou – Cyprus University of Technology
Nicholas Kyriakides – Cyprus University of Technology

   

SUMMARY OF PROPOSED RESEARCH:

Much of the existing building stock in Europe has been designed according to old standards and often suffers from poor quality materials and inadequate construction practices. As a result, these structures have deficient lateral load resistance and can rapidly lose their strength during earthquakes leading to collapse. Strengthening of deficient structures is an effective way of reducing their vulnerability and thus the societal risk. Among the different techniques currently available for seismic rehabilitation of RC structures, Post‐tensioned Metal Straps (PTMS) have demonstrated to offer very effective and economic solutions. The efficiency of PTMS technique to improve the flexural and compressive behaviour of deficient RC members has been proved by several static tests at The University of Sheffield. However, this technique is relatively new in construction and its performance should be evaluated by dynamic tests on full‐scale substandard RC building structures, to assist in the development of efficient design methods.
In this proposed project, two substandard full‐scale two‐storey RC frames with poor detailing in joints and columns will be tested under unidirectional shake table excitations to assess the potential and limitations of different seismic rehabilitation strategies using PTMS. In order to get maximum benefit from the frames, shaking tests will be performed independently in both X and Y directions.
The first building will be initially damaged to evaluate the seismic performance of typical substandard structures in Europe and developing countries. Using the experimental results, analytical models will be developed to predict the seismic behaviour of low strength RC beam‐column joints. Subsequently, the damaged building will be retrofitted using PTMS to examine the efficiency of this method for rehabilitation of damaged RC buildings after earthquakes. The second building will be initially strengthened using PTMS and adopting a different strengthening strategy for beams, columns and joints. After the strengthening intervention, shaking tests will be carried out to evaluate the efficiency of the proposed technique in improving the seismic performance of deficient structures at both the local and global level. CFRP will also be used to strengthen some of the joints of both structures in only one direction. This will provide additional data that will be used to evaluate the efficiency of PTMS compared to more conventional techniques. The results of this study will prove instrumental in understanding the seismic behaviour of deficient RC buildings, and in providing guidelines for the use of PTMS as an efficient and economic strengthening technique. 


View of a joint of BANDIT building strengthened with CFRP

What's next

Series logo small   SERIES Concluding Workshop
  Joint with US-NEES "Earthquake Engineering Research Infrastructures

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