CIVIL Case Studies

Structural analysis of skybus system

Objective:

A skybus system was to be constructed in a major metropolis. The RCC and steel structure was to have a two-compartment movable carriage suspended under it. Static and transient dynamic analysis of the skybus system was to be carried out for conditions like with/without the carriage and for loads due to wind, earthquake, live loads and moving loads.

Methodology:

The structure was idealized in two ways. In the first stage a grillage model using beam elements was adopted to arrive at the preliminary dimensions for the skybus system. In the second stage a finite element model was generated using solid elements. Upon analyzing the magnitude of stresses and deflections were found to be much lower in case of static analysis. Stresses and deformations from transient dynamic and seismic analysis were also well within limits.

Structural analysis of a bridge subjected to moving loads

A bridge was needed to be designed for various loads such as self/body loads, moving loads and wind loads. The bridge was designed and in addition bending moment diagrams were produced to show structural integrity in any of these loading conditions.

Airflow analysis on two buildings to reduce channel effect

A building was to be constructed behind an existing building in a fairly open and windy area. The concern was that the wind after passing from the sides of the new building would enter the channel between the two buildings, giving rise to unnecessary vibrations and sounds. Computational fluid dynamic analysis was carried out to achieve an almost-zero channel effect.

Structural analysis of a twin steel dome subjected to various loads

A project was undertaken to analyze and design a dual dome steel roof for a 200-seat capacity assembly hall. A 3D finite element model was constructed and the structure was analyzed for various combinations of dead loads, live loads, wind loads and seismic loads.

Structural analysis of an earthen bund subjected to hydrostatic pressure

The stress and modal analysis of an earthen bund under hydrostatic pressure was carried out for a government irrigation department.

Structural analysis and design of a dry fabric seal type gas holder

A project was undertaken to conduct stress analysis and design of a dry fabric seal type gas holder (capacity 30,000 cubic meters).

The 3D FEM model of the main structure and piston were created separately. The structure was analyzed and designed for a range of dead loads, live loads, wind loads and seismic loads. It was also analyzed and designed for a working pressure of 200 kilograms per square meter.

Structural analysis of a multi-layered space frame canopy subjected to various loads

A project was undertaken to analyze a multi-layered steel space frame structure which was to form the entrance canopy of an important building.

The 3D FEM model of the structure was created. The structure was analyzed for a range of dead loads, live loads, wind loads and temperature loads. All elements were validated for strength criteria per IS 800-1984.

Structural analysis of an ogee weir subjected to hydrostatic pressure

The stress and modal analysis of an Ogee Weir under hydrostatic pressure was carried out for a government irrigation department.

Structural analysis of a radial gate subjected to hydrostatic pressure

The stress and modal analysis of a radial gate under hydrostatic pressure was carried out for a government irrigation department.

Failure analysis of a 4,000,000-liter overhead tank resting on sloping ground

A project was undertaken to conduct a post-failure analysis of a 4,000,000-liter overhead tank resting on a sloping ground.

A 3D FEM model of the complete structure was constructed. The structure was analyzed for a range of dead loads, live loads, wind loads and seismic loads.

The model was also analyzed for support settlement. It was determined that the maximum vertical deflection of any single column before failure of the entire structure was about 3 millimeters. Because of ground settlement in excess of 3 millimeters the structure underwent catastrophic failure.

Structural analysis of a transmission tower experiencing wind loads

A power transmission tower manufacturer needed to submit a safety report on its towers. Stress and vibration analysis due to wind loads was carried out to qualify the towers for installation.