An Experimental Study to Estimate Loss of Prestress and Determining Fundamental Natural Frequecny of Prestressed Concrete Bridge

prestressed concrete
Prestressed Concrete (PSC) structures especially bridges are being largely used all over the world due to their multifarious advantages in terms of structural behaviour, economy as well as aesthetical aspects. However, many PSC structures deteriorate with time due to several factors which may lead to certain loss in their initial applied prestress. This loss may affect the structure’s behaviour and its service life adversely and need to be checked. Such loss of prestress results in degradation of stiffness of the structure. A precise determination of prestress losses in prestressed concrete members is a complicated problem because the rate of loss due to one factor, such as relaxation of tendons, is continually being altered by changes in stress due to other factors, such as creep of concrete, fatigue, etc. It has been known that any change in the stiffness of the structure will change its natural frequency also. Hence, it may be possible to ascertain the loss by measurement of natural frequency at regular intervals. In this study, an effort has been made to know the natural frequency of a PSC structure by Vibration Method and determining the existing prestressing force to ascertain the loss of prestress.

This is a premium article available exclusively for our subscribers.
If you are already a subscriber, please Login
If not, subscribe now and get access to well researched articles & reports on infrastructure construction, equipment & machinery, innovations & technology, project reports, case studies, and more. All this by simply paying just ₹200/- for a month of complete portal access, or a discounted rate of ₹1000/- for a full year of access.
NBM&CW September 2017

No comments yet, Be the first one to comment on this.

×

Terms & Condition

By checking this, you agree with the following:
  1. To accept full responsibility for the comment that you submit.
  2. To use this function only for lawful purposes.
  3. Not to post defamatory, abusive, offensive, racist, sexist, threatening, vulgar, obscene, hateful or otherwise inappropriate comments, or to post comments which will constitute a criminal offense or give rise to civil liability.
  4. Not to post or make available any material which is protected by copyright, trade mark or other proprietary right without the express permission of the owner of the copyright, trade mark or any other proprietary right.
  5. To evaluate for yourself the accuracy of any opinion, advice or other content.
Transforming Bridge Construction With Innovative Building Materials

Transforming Bridge Construction With Innovative Building Materials

Dr S B Hegde reviews recent advancements in sustainable materials, their properties, applications, benefits, and prospects in India’s bridge construction industry.

Read more ...

Precast Segmental Construction Ensures Faster Infrastructure Construction

Precast Segmental Construction Ensures Faster Infrastructure Construction

The precast segmental construction is the most sought after methodology with its speed as high as 2½ days per span of superstructure construction. Er. Vinay Gupta, Managing Director, Tandon Consultants

Read more ...

15 Bridges Collapse in 2 Months: Bihar’s Infrastructure Crisis Unfolds

15 Bridges Collapse in 2 Months: Bihar’s Infrastructure Crisis Unfolds

Bihar is witnessing an alarming series of bridges collapsing, highlighting the vulnerability of both new and existing infrastructure in the state, and raising concerns about public safety and the overall effectiveness of its infrastructure

Read more ...

Cengrs Geotechnica: Preventing Bridge Collapse Through Foundation Testing

Cengrs Geotechnica: Preventing Bridge Collapse Through Foundation Testing

The recent bridge collapses in Bihar have ignited widespread concern over the safety and reliability of our critical infrastructure. As a specialist in Geotechnical Engineering, I firmly believe that thorough geotechnical investigations

Read more ...

Chaitanya Projects Consultancy: Addressing Bridge Failures

Chaitanya Projects Consultancy: Addressing Bridge Failures

The recent bridge collapses in Bihar have cast a spotlight on the pressing issue of infrastructure safety. These tragic events underscore the need for a thorough examination of the reasons behind such failures and the implementation

Read more ...

MASIN: Unraveling the Causes of Bridge Collapses in India

MASIN: Unraveling the Causes of Bridge Collapses in India

MASIN delves into the critical factors contributing to bridge collapses in India, including design flaws, construction errors, and maintenance issues.

Read more ...

Constructing Bridges Right: Risk Management for Large-Scale Projects

Constructing Bridges Right: Risk Management for Large-Scale Projects

Constructing large bridge projects entails managing multifaceted risks, spanning from product quality to project management. Mitigation strategies involve thorough planning, stakeholder engagement, regulatory compliance, and proactive

Read more ...

Impact of Baltimore Bridge Collapse on Machinery Supply in the US

Impact of Baltimore Bridge Collapse on Machinery Supply in the US

Alexander Jones, Research Analyst, delves into the impact of Baltimore Bridge collapse on the agricultural and construction machinery supply chain in the United States. The tragic incident in which a container ship collided with a support

Read more ...

Comparative Analysis: Japanese vs Indian Bridge Fabrication Techniques

Comparative Analysis: Japanese vs Indian Bridge Fabrication Techniques

This technical paper delves into a comparative analysis of steel bridge fabrication methods employed in Japan and the traditional practices in India, with a specific focus on the Mumbai-Ahmedabad High-Speed Rail (MAHSR) project's adaptation

Read more ...

Remotely Piloted Aerial Vehicle (RPAV) Based Bridge Monitoring

Remotely Piloted Aerial Vehicle (RPAV) Based Bridge Monitoring

Dr. Naveet Kaur, Senior Scientist, Bridge Engineering & Structures Division, CSIR-CRRI, New Delhi, shares information on the various types of applications of RPAV technology in BHM, including visual inspection, non-destructive testing, and structural health

Read more ...

Prestressing Concepts, Systems & Technologies in Bridges

Prestressing Concepts, Systems & Technologies in Bridges

Prestressing works as an active force in the structure, opposite to applied tensions. There are several types of prestressing such as Internal Prestressing, External Prestressing, Bonded Prestressing, Unbonded Prestressing, etc. Pre-tensioning and Post-tensioning

Read more ...

Structural Integrity Assessment of Submerged Bridges Using Robotic Inspection and Scour Survey

Structural Integrity Assessment of Submerged Bridges Using Robotic Inspection and Scour Survey

In a developing country like India, roads, rails and bridges are amongst the most important infrastructure assets that connect every corner of the country. Roads and bridges tend to undergo wear and tear with aging. When they get submerged

Read more ...

Structural Retrofitting of Chitpore Bridge

Structural Retrofitting of Chitpore Bridge

The Chitpore Bridge was repaired using anti-corrosive treatment, rebuilding of concrete section with micro concrete and polymer, followed with strengthening by using SRM C-wraps and SRM C- Laminates of carbon fiber. After successful completion

Read more ...

Design Concept of Iconic Pedestrian Bridges - Atal, Sambhaji, and Deccan

Design Concept of Iconic Pedestrian Bridges - Atal, Sambhaji, and Deccan

Theme-based concepts of structural forms and designs of bridges are developed through collaborative efforts of the architects and engineers to maintain their aesthetics and structural efficiency. Any bridge or infrastructure is designed for

Read more ...

Construction of Balason Bridge in Darjeeling District @ West Bengal - An Engineering Feat

Construction of Balason Bridge in Darjeeling District @ West Bengal - An Engineering Feat

Situated amidst picturesque surroundings, Balason Bridge is located about 50 km from Siliguri Town, 17 km from Mirik Town and 80 km from Darjeeling Town. The Extension of Balason Bridge @ Dudhia is located 25 km from Siliguri Town in the state of West

Read more ...

Dextra supplies Mechanical Rebar Couplers and Post-Tensioning Bar Systems to new Zuari Bridge in Goa

Dextra supplies Mechanical Rebar Couplers and Post-Tensioning Bar Systems to new Zuari Bridge in Goa

An 8-lane cable-stayed bridge being constructed over the river Zuari in South Goa, has taken engineering to new heights. This is the second longest and widest cable-stayed bridge in India; it will serve Expressway NH-66 that runs between Panaji

Read more ...

Construction Industry - Progressing Towards A 'Digital' Future

Construction Industry - Progressing Towards A 'Digital' Future

The Indian construction and engineering industry is poised for significant growth with a projected expansion of 6.6% in real terms. As part of the ambitious Pradhan Mantri Gati Shakti Master Plan, worth $1.3 trillion, India’s infrastructure development

Read more ...

NHAI invites bids ₹244-cr six-lane flyover & two-lane ROB in Odisha

NHAI invites bids ₹244-cr six-lane flyover & two-lane ROB in Odisha

NHAI invites bids for six-lane flyover and two-lane ROB in Odisha with an investment of ₹244.32 crore. The Ainthapali junction project on NH-53 (Old NH-6) in Sambalpur involves the rehabilitation, upgradation, and augmentation

Read more ...

Synergising Aatmanirbhar Bharat and Operational Preparedness: Launch of Indigenous Modular Bridge in Sikkim

Synergising Aatmanirbhar Bharat and Operational Preparedness: Launch of Indigenous Modular Bridge in Sikkim

Enhanced operational preparedness along the borders and the need to be self-reliant are two major aspects that have seen a substantial impetus over the last few years. The Border Roads Organisation (BRO) has been a key contributor to the infrastructure

Read more ...

To get latest updates on whatsapp, Save +91 93545 87773 and send us a 'Saved' message
Click Here to Subscribe to Our eNewsletter.