Question
Asked 12th Nov, 2015

What is meant by retrofitting structures?

Dear researchers;
if a structure is damaged by an earthquake, stiffness K and damping C parameters of some floors are reduced by 0.7 or 0.8.
how can I say that I retrofitted this structure to resist against a future earthquake ?
what should change between the damaged and the retrofitted responses of the structure ?
what are the parameters that the retrofitting should affect ? 
Best regards 

Most recent answer

26th Apr, 2020
Vishnu Vijayan
Baselios Matthews II College of Engineering
Retrofitting is the process of addition of new features to older buildings, heritage structures, bridges etc. Retrofitting reduces the vulnerability of damage of an existing structure during a near future seismic activity.
Retrofitting of RCC structural members is carried out to regain the strength of deteriorated structural concrete elements and to prevent further distress in concrete. Strength deficiency of concrete structural members can be due to poor workmanship, design errors, and deterioration due to the aggression of harmful agents.
There are several techniques which are used to retrofit structural members such as section enlargement, external plate bonding, external post-tensioning, grouting, and fibre reinforced polymer composites. Based on the severity of the damage and required capacity to be regained, a proper retrofitting technique is specified and implemented.

All Answers (7)

13th Nov, 2015
Reza Darbanian
Shahrood University of Technology
by emergancy retrofit, that is good topic for research
but i'm study in sequence earthquake (damage building due to main shock) then consider effect of aftershock in residual capacity(opensees)
1 Recommendation
13th Nov, 2015
Ponkumar Ilango
Dr. M.G.R. University
Dear Friends ,
That is ,
  @ $ " Rehabilitation of the  Structure " $ $
1 Recommendation
13th Nov, 2015
Mahdi Abdeddaim
Université de Biskra
Dear Ponkumar;
Let us say rehabilitation, what should be rehabilitated in this case ? what are the parameters to study ?
regards
13th Nov, 2015
Ponkumar Ilango
Dr. M.G.R. University
Dear Mahdi Abdeddaim,
Yes ,we can say Rehabilitation of the structure so as to you asked this Question " What is mean by retrofitting structures? "
The Parameters are ,
  •    Identification of type of structure in Details ( Residential , Commercial           ,Industrial  structures etc. 
  •    Type of Failure
  •    Year of Structure
  •    Loading Details of the structure etc.
Then we have to go for Type of Retrofitting of the Structure Because some place various type of failure and crack width also - more or less , so according to have to be select the filling  materials and rapping sheets also if required , these have to be provided and corrected the structure . This is Retrofitting of the structures.
1 Recommendation
13th Nov, 2015
Mahdi Abdeddaim
Université de Biskra
Dear Ponkumar
What I'm doing is purely numeric and simulation. I'm damaging a 2D shear building how I'm doing that by reducing K and C is some specific floors (Ground floor, middle floor and top floor). when I do this she behaviour of the structures change. 
After that I introducer my retrofitting technique. 
The questions is what are the parameters that I should check before and after the retrofitting ? mode shapes ? frequencies ? displacements ? accelerations ? velocity ? how can I prove that my technique or strategy is working ?
Regards
14th Nov, 2015
Ponkumar Ilango
Dr. M.G.R. University
Dear Mahdi Abdeddaim,
ya that was i said before and During Design what are the parameters must be followed that should be collect ,once again Have to be checked Types and Loading each Floor and moment . 
1 Recommendation
26th Apr, 2020
Vishnu Vijayan
Baselios Matthews II College of Engineering
Retrofitting is the process of addition of new features to older buildings, heritage structures, bridges etc. Retrofitting reduces the vulnerability of damage of an existing structure during a near future seismic activity.
Retrofitting of RCC structural members is carried out to regain the strength of deteriorated structural concrete elements and to prevent further distress in concrete. Strength deficiency of concrete structural members can be due to poor workmanship, design errors, and deterioration due to the aggression of harmful agents.
There are several techniques which are used to retrofit structural members such as section enlargement, external plate bonding, external post-tensioning, grouting, and fibre reinforced polymer composites. Based on the severity of the damage and required capacity to be regained, a proper retrofitting technique is specified and implemented.

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