The exoskeleton: a solution for seismic retrofitting of existing buildings

There is a significant experience related to seismic retrofitting of existing buildings in many earthquake-prone regions of the world. Majority of older existing buildings were not designed to the seismic hazard level expected by current design codes; also, some structural types (like unreinforced masonry) are inherently more vulnerable to earthquake effects than others, e.g. well-designed reinforced concrete (RC) and steel buildings. It should be noted that seismic retrofitting of school buildings has been performed in several countries.It is proposed to effective strengthening of structures on the basis performance-design and pushover analyses, whis are an first time innovation for Kyrgyz Republic.

Download Full-text

Optimal seismic retrofitting of existing buildings considering environmental impact

Engineering Structures ◽

10.1016/j.engstruct.2021.113391 ◽

2022 ◽

Vol 250 ◽

pp. 113391

Author(s):

Nicholas Clemett ◽

Wilson Wladimir Carofilis Gallo ◽

Gerard J. O'Reilly ◽

Giammaria Gabbianelli ◽

Ricardo Monteiro

Keyword(s):

Environmental Impact ◽

Seismic Retrofitting ◽

Existing Buildings

Download Full-text

Seismic Retrofitting and Health Monitoring of School Buildings of Cyprus

The Open Construction and Building Technology Journal ◽

10.2174/1874836801307010208 ◽

2013 ◽

Vol 7 (1) ◽

pp. 208-220 ◽

Cited By ~ 5

Author(s):

C.Z. Chrysostomou ◽

N. Kyriakides ◽

A.J. Kappos ◽

L. Kouris ◽

E. Georgiou ◽

...

Keyword(s):

Health Monitoring ◽

Future Generation ◽

Seismic Retrofitting ◽

School Buildings ◽

Assessment Methodology ◽

Existing Buildings ◽

Wireless Monitoring ◽

Codes Of Practice ◽

Seismic Forces

The vulnerability of existing buildings to seismic forces and their retrofitting is an international problem. The majority of structures in seismic-prone areas worldwide are structures that have been designed either without the consideration of seismic forces, or with previous codes of practice specifying lower levels of seismic forces. In Cyprus, after the three earthquakes that occurred in 1995, 1996, and 1999, the Cyprus State, acting in a pioneering way internationally, has decided the seismic retrofitting of all school buildings, taking into account the sensitivity of the society towards these structures, which house the future generation of the society. In this paper the overall assessment methodology is presented, along with details of the over 10 year ongoing retrofitting program of the school buildings of Cyprus, with emphasis on the description of the program and the development of a wireless monitoring system. In addition, mathematical models of selected school buildings are presented and comparison is made with in-situ measurement.

Download Full-text

Application of steel in refurbishment of earthquake-prone buildings

Journal of the Croatian Association of Civil Engineers ◽

10.14256/jce.2970.2020 ◽

2020 ◽

Vol 72 (10) ◽

pp. 955-965

Author(s):

Stjepan Lakusic

Keyword(s):

Significant Role ◽

Public Awareness ◽

Seismic Retrofitting ◽

Assessment Procedure ◽

Seismic Loads ◽

Topical Issue ◽

Existing Buildings

Refurbishment of existing buildings has become an increasingly topical issue in recent years. The recent Zagreb earthquake has also increased public awareness about the issue of sensitivity of old buildings to seismic loads. Steel plays a significant role in all aspects of refurbishment as it offers reliable rehabilitation and retrofitting solutions. The paper provides an overview of refurbishment methods with an emphasis on the assessment procedure for existing buildings, and methods for their seismic retrofitting using steel. Solutions that use new steel elements or improve the properties of existing ones are discussed, and some innovative retrofitting systems are highlighted.

Download Full-text

A Review on Seismic Retrofit of Beam-Column Joints

International Journal for Modern Trends in Science and Technology - RTT2020 ◽

10.46501/ijmtst060914 ◽

2020 ◽

Vol 06 (09) ◽

pp. 80-93

Author(s):

Sreadha A R, Dr.C.Pany and M V Varkey

Keyword(s):

Seismic Risk ◽

Seismic Retrofit ◽

Seismic Retrofitting ◽

Fiber Reinforced Polymers ◽

Existing Buildings ◽

Fiber Reinforced ◽

Seismic Strengthening ◽

Crucial Issue ◽

Reinforced Polymers ◽

The World

Earthquakes are one of the biggest life-threats in the world. The effect is immediate, with little to no warning about damage plans and the collapse of buildings/structures. Prevention of earthquake-related disasters has become more and more important in recent years. Preventing disasters involves reducing seismic risk by retrofitting existing buildings. Seismic retrofitting has now become a crucial issue. Retrofitting helps improve the structure's strength, resistivity and overall lifespan. Recent occurrences of earthquakes in various parts of the world have clearly shown the urgency of repairing deficient seismic structures. The paper summarised many past studies in the form of a seismic strengthening solution, based on the type of beam-column joints, retrofitting technology and fiber reinforced polymers (FRP).

Download Full-text

A Seismic Retrofit Cost Database for Buildings with a Framed Structure

Earthquake Spectra ◽

10.1193/080713eqs226 ◽

2014 ◽

Vol 30 (2) ◽

pp. 625-637 ◽

Cited By ~ 4

Author(s):

Reza Jafarzadeh ◽

Jason M. Ingham ◽

Suzanne Wilkinson

Keyword(s):

Seismic Retrofit ◽

Seismic Retrofitting ◽

School Construction ◽

Existing Buildings ◽

Construction Costs ◽

The World ◽

Data Points ◽

Key Variables ◽

Data Collection Effort ◽

Specific Challenge

A comprehensive database for the specific challenge of cost prediction when undertaking seismic retrofitting of existing buildings is presented. A rigorous data collection effort performed in Iran resulted in the generation of a database of 158 data points, each pertaining to a public school building with a framed structure. The generated database includes the information on the seismic retrofit cost values reflected in construction tender documents, together with the information on 14 variables envisaged to have a degree of influence on this cost. This information for a given building was carefully elicited from the final enacted documents developed through the seismic retrofit study of that particular school. Construction costs include structural costs and the costs of architecture and finishes. The database could be of value to those attempting to determine key variables that influence retrofit cost, or to those comparing retrofit practices and costs in different areas of the world.

Download Full-text

On the selection by MCDM methods of the optimal system for seismic retrofitting and vertical addition of existing buildings

Computers & Structures ◽

10.1016/j.compstruc.2015.06.016 ◽

2015 ◽

Vol 159 ◽

pp. 1-13 ◽

Cited By ~ 34

Author(s):

Antonio Formisano ◽

Federico M. Mazzolani

Keyword(s):

Optimal System ◽

Seismic Retrofitting ◽

Existing Buildings

Download Full-text

Simplified Design of Masonry Ring-Beams Reinforced by Flax Fibers for Existing Buildings Retrofitting

Buildings ◽

10.3390/buildings10010012 ◽

2020 ◽

Vol 10 (1) ◽

pp. 12 ◽

Cited By ~ 2

Author(s):

Mariateresa Guadagnuolo ◽

Giuseppe Faella

Keyword(s):

Natural Fibers ◽

Good Combination ◽

Seismic Retrofitting ◽

Seismic Events ◽

Masonry Building ◽

Existing Buildings ◽

Clay Brick ◽

Flax Fibers ◽

Clay Bricks ◽

Concrete Ring

Seismic events have repeatedly highlighted the vulnerability of existing masonry buildings. Seismic retrofitting is frequently focused on improving the connection between walls and roof for ensuring behavior able to resist loads from any horizontal direction. This paper deals with the design of masonry ring-beams made of clay bricks reinforced by natural fibers. Various solutions to ensure a masonry building box-behavior are possible, but this is a good combination of both static and conservation requirements, as it allows the use of bio-composites and grouts. It is a relevant possible alternative to the traditional reinforced concrete ring-beams, which are proven to be very ineffective under earthquakes. A simplified model for designing clay brick beams reinforced by flax fibers is provided, and a comparison with customary and traditional floor/roof masonry ring-beams is carried out.

Download Full-text

The High-Performance Dissipating Frame (HPDF) System for the Seismic Strengthening of RC Existing Buildings

Sustainability ◽

10.3390/su13041864 ◽

2021 ◽

Vol 13 (4) ◽

pp. 1864

Author(s):

Vincenzo Manfredi ◽

Giuseppe Santarsiero ◽

Angelo Masi ◽

Giuseppe Ventura

Keyword(s):

High Performance ◽

Design Procedure ◽

Seismic Retrofitting ◽

Existing Buildings ◽

Sustainable Solutions ◽

Seismic Rehabilitation ◽

Existing Structures ◽

Rc Frames ◽

Frame System ◽

Displacement Based

In Italy as well as in other earthquake-prone countries, the large number of existing buildings requiring seismic retrofitting calls for sustainable solutions able to reduce both costs and downtime. To this purpose, in this paper, the High-Performance Dissipating Frame system (HPDF), a new strengthening solution for the seismic rehabilitation of existing buildings, is presented. HPDF is based on external precast reinforced concrete (RC) frames rigidly connected to the existing structures and equipped with shear damper devices in order to provide high dissipation capacity. The proposed solution permits: (i) to increase sustainability through works made up from the outside without removing/demolishing infills/other non-structural components, (ii) rapid execution by adopting precast resisting members mutually restrained with steel connections, and (iii) effectiveness due to shear damper devices able to dissipate a large amount of shaking energy. In the paper, a displacement-based design procedure is proposed and applied to a numerical example.

Download Full-text

Describe the process of retrofitting existing buildings and evaluate the effectiveness of it in improving the seismic performance of structures in earthquake-prone regions

Journal of Building Material Science ◽

10.30564/jbms.v1i2.2543 ◽

2020 ◽

Vol 1 (2) ◽

Author(s):

Chang Liu

Keyword(s):

Wenchuan Earthquake ◽

Ground Motion ◽

Seismic Performance ◽

Seismic Activity ◽

Seismic Retrofitting ◽

Existing Buildings ◽

Existing Structures ◽

Soil Failure

At present, earthquakes are a serious problem for building. Severe damages and collapses of buildings were caused by earthquakes in different degrees.It is reported that there are more than 68,858 deaths and hundreds of billions RMB losses in the May 12, 2008 Great Wenchuan Earthquake(Wang, 2008). So, more attention should be paid to seismic technology. In order to face the challenges of earthquake on building, the seismic retrofitting was put forward, which“is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes”

Download Full-text