IIT Delhi Researchers Develop Low-Cost Super-Elastic Buckling Restrained Braces To Improve Earthquake Resistance Of Structures

by Swarajya Staff - May 20, 2022 10:04 AM +05:30 IST
IIT Delhi Researchers Develop Low-Cost Super-Elastic Buckling Restrained Braces To Improve Earthquake Resistance Of StructuresIIT Delhi campus (Representative Image) (Asad K electro/Wikipedia)

Indian researchers have developed low-cost buckling-restrained braces that can give improved protection to constructions from earthquakes.

These braces have several advantages, such as all-steel components, onsite fabrication and assembling process, post-earthquake inspection, and easy replacement.

The earthquake resistance of civil structures is often improved by using seismic force-resisting systems or vibration control devices. Buckling-restrained braces are the special structural elements that serve both purposes.

Researchers at IIT Delhi have fabricated novel hybrid buckling-restrained braces (HBRBs) having higher strength, excellent ductility, and better energy dissipation potential, according to a Science and Technology Ministry release.

Professor Dipti Ranjan Sahoo and his student Dr Ahmad Fayeq Ghowsi of IIT Delhi, who fabricated the braces, studied the seismic performance of more than ten full-scale HBRBs at the full-scale testing facility of the Heavy Structures Laboratory of the Department of Civil Engineering, IIT Delhi developed under Fund for Improvement of S&T Infrastructure (FIST) programme of Central government's Department of Science & Technology.

Tests are being conducted on specimens with improvements and modifications at the laboratory, and according to Professor Sahoo, a patent has recently been applied for the proposed bracing system.

A typical HBRB comprises two segments, namely, elastic steel brace (non-replaceable) and short-core BRB (replaceable) segments, connected in series along their lengths. Steel braces can be made up of hollow circular or square hot-rolled structural steel sections.

Superplastic shape memory plates are used at the centralized core elements of BRB, which is encased by unbonded built-up steel casings fabricated using four structural steel rolled angle sections and bolted connections.

The core elements are designed to undergo inelastic deformation under cyclic axial loadings to provide the required strength, ductility, and hysteretic energy dissipation.

“These braces can be customized depending on the seismic demand expected on buildings or bridges located in different seismic zones of India," Sahoo informed.

The proposed technology is effective in the new constructions and has a great potential for the upgradation and retrofitting of seismically deficient reinforced concrete (RC) and steel framed structures, such as residential/office buildings, hospitals, and school buildings.

These braces can also be conveniently adopted in the steel and concrete bridges to enhance their earthquake resistance.

The implementation of this technique in the existing structures reduces overall retrofitting cost and minimizes the intervention and downtime. It is possible to design a structure to achieve the required performance objectives in terms of strength and serviceability utilizing the hybrid buckling-restrained braces.

Get Swarajya in your inbox everyday. Subscribe here.

An Appeal...

Dear Reader,

As you are no doubt aware, Swarajya is a media product that is directly dependent on support from its readers in the form of subscriptions. We do not have the muscle and backing of a large media conglomerate nor are we playing for the large advertisement sweep-stake.

Our business model is you and your subscription. And in challenging times like these, we need your support now more than ever.

We deliver over 10 - 15 high quality articles with expert insights and views. From 7AM in the morning to 10PM late night we operate to ensure you, the reader, get to see what is just right.

Becoming a Patron or a subscriber for as little as Rs 1200/year is the best way you can support our efforts.

Become A Patron
Become A Subscriber
Comments ↓
Get Swarajya in your inbox everyday. Subscribe here.

Latest Articles

    Artboard 4Created with Sketch.