Innovations in Plate Girder Design

Plate girders are often used in structures having spans more than 15-20m. Normal plate girders are provided with intermediate and edge stiffeners, to utilize the post buckling strength of the webs. However, they are often expensive due to additional fabrication and welding. Moreover the detailing has to be proper-otherwise their fatigue strength may be reduced. Recent innovations like hybrid girders and corrugated webs coupled with the developments in automatic welding processes have made these girders economical, aesthetic, and faster to fabricate and erect. They offer as viable alternates to reinforced concrete beams in numerous types of long span structures.

Dr. N. Subramanian Consulting Engineer, Gaithersburg, MD, USA

Introduction

A plate girder is basically an I-beam built up from plates using riveting or welding. It is a deep flexural member that can carry loads which cannot be economically carried by rolled beams. Standard rolled sections may be adequate for many of the usual structures; but in situations where the load is heavier and the span is also large, the designer has the following choices, (Fig.1).
  • Use two or more regularly available sections, side-by-side.
  • Use a cover-plated beam; i.e. weld a plate of adequate thickness to increase the bending resistance of the flange.
  • Use a fabricated plate girder, wherein the designer has the freedom (within limits) to choose the size of web and flanges, or
  • Use a steel truss or a steel-concrete-composite truss.
Among the options available, the first is usually uneconomical and does not satisfy deflection limitation. The second option is advantageous where the rolled section is marginally inadequate. Therefore the real choice lies between the plate girder and the truss girder. Plate girders have a moment resisting capacity in between rolled I sections and truss girders. Truss girders involve higher cost of fabrication and erection, problems of vibration and impact, and require higher vertical clearance. For short spans (< 10 m) plate girders are uneconomical due to increase in connection cost and rolled I sections are the preferred choice.

This section of the article is only available for our subscribers. Please click here to subscribe to a subscription plan to view this part of the article.

Click Here
To Know More or to Contact the Manufacturer
Please let us know your name.
Invalid Input
Please let us know your Designation.
Please let us know your Contact Number.
Please let us know your email address.
Please brief your query.
Our other Value-Added Services:

To receive updates through e-mail on Products, New Technologies & Equipment, please select the Product Category(s) you are interested in and click 'Submit'. This will help you save time plus you will get the best price quotations from many manufacturers, which you can then evaluate and negotiate.

Invalid Input
Invalid Input
Invalid Input
As part of Northeast Policy, the Ministry of Railways took up the project of providing rail connectivity to Imphal in Manipur state. As per the detailed survey, the rail alignment takes off from existing Jiribam

Read more ...

Brahmaputra is one of the longest river in Asia with a total length of 2880 km & out of which 920km (approx.) lie in India. The New Brahmaputra Bridge @ Tezpur is one of the most challenging one, in the attempt to bridge

Read more ...

The road and railway crossing across the Brahmaputra on National Highway-52B is located at Bogibeel, about 17km downstream of Dibrugarh in Assam. The location is an area of high intensity rainfall (the annual rainfall ranges

Read more ...

The world has progressed beyond imaginations. Similar to the field of IT, Civil Engineering has also taken several steps forward to bring out innovative technologies to meet challenges of this world’s aspirations. Going forward from

Read more ...

The bridge lies in the state of Assam, but this location is usually referred to as upper Assam as it is far away from Guwahati and bordering China. The nearest airport is Dibrugarh. Then there is a drive of 65km into the

Read more ...

The Infrastructure Industry is continuously evolving; new roads, elevated corridors, expressways, railways, dedicated corridors, metros, mono-rails are being constructed all the time. They also require constant

Read more ...

The 6.5 feet wide walkway in the Hongyagu Scenic Area in Hebei province hangs 755 feet above the ground, and is the world's longest bridge, which opened in 2017-end. Designed by Tel Aviv architect Haim Dotan

Read more ...

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

Read more ...

Four Span Pipe Bridge
Distressed structures require necessary remedial measures in order to restore their original structural properties like strength and stiffness. Validating the effectiveness of the proposed qualitative remedial

Read more ...

Foot Bridges
Footbridges have a longer history than road or railway bridges. Ancient footbridges comprised of natural materials such as roots of trees, ropes, stones, masonry, and wood. Modern footbridges are built

Read more ...

Thane Creek Bridge
Load testing is done to determine the safe load carrying capacity of structures, determining if specific legal or overweight vehicles can safely cross the structure or needs to be restricted and the level of post

Read more ...

Bridge in Central Kerala
Cement concrete is a versatile building material and is the second most consumed material in the world, after water. It is made using porland cement, coarse, and fine aggregates, water and one or more

Read more ...

Concrete Road Bridges
Planning, design and construction of bridges and flyovers is very challenging at places with space constraints. There has been rapid development with the availability of high strength steel and concrete

Read more ...

Integral Abutment Bridges
The conventional bridges use expansion joints and bearings to accommodate the thermal movements of the bridge. However, they don't completely eliminate the distress caused because

Read more ...

Bridge Restoration
The use and advantages of Post Tensioning are very well known in the Civil Engg Industry as it has been in use for the last 40 to 50 years. Post tensioning is one of the best methods to induce stresses in the concrete

Read more ...

Signature Bridge
Wazirabad Bridge or Signature Bridge Project is an initiative of Delhi Government, planned during the Commonwealth Games. It was conceptualized to be a landmark tourist icon that would also speed

Read more ...

Integral Abutment Bridge
An integral bridge may be defined as having no expansion joints or sliding bearings, the deck is continuous across the length of the bridge. Integral bridges are alternatively referred to as integral abutment

Read more ...

Soil Structure Interaction
A type of bridge that is used extensively in road applications in particular is the integral abutment bridge (IAB). The concept of "integral abutment bridge" has recently become a topic of remarkable

Read more ...

Cracks in Ravi Bridge
Before carrying out any testing of the concrete structures using NDT methods, visual inspection of the structure is a must. Visual inspection is not confined to the surface, it also include examination of bearings

Read more ...

Mithi River Bridge
Strengthening of RCC structural elements is a common task for maintenance nowadays. For the purpose of strengthening, several materials and methods are available such as sprayed concrete

Read more ...

×
Sign-up for Free Subscription
'India Construction Week'
Weekly e-Newsletter on Construction Industry
Get the latest news, product launches, projects announced / awarded, government policies, investments, and expert views.