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Seismic Design

Seismic Design & Earthquake Resistant Construction

Earthquake resistance is the ability of the structure to withstand earthquakes. These structures perform better during the earthquakes and give sufficient time to its dwellers to evacuate the building, besides saving lives, reducing injuries and lowering the damages of the earthquake. These structures are intended to withstand the largest earthquake of a
Effects of Earthquake on URM buildings

Effects of Earthquake on Unreinforced Masonry Buildings

For given direction of earthquake, wall A acts as a shear wall and B acts as flexure wall. If the walls are not tied together wall B overturn (out of plane) and wall A slides (in plane) and collapse occurs. Masonry units should be tied properly. Such type of failure was among the most common, resulting from out-of-plane vibration of the walls. As the wall bends
Earthquake Safe Construction Guidelines

Earthquake Safe Construction Guidelines

If Vulnerability is reduced, risk of disaster will decrease. Prediction of earthquake only saves human losses not economic losses due to collapse. Most of earthquake occurs in ocean. Earthquake of Magnitude 6 evolves energy that is equal to 1 Hiroshima atomic bomb. Magnitude 7 ==> 100x Energy evolved = 1 Hiroshima atomic bomb. Magnitude 8 ==> 100 x
Shock Table Dynamic Test

Shock Table Dynamic Test - Structural Dynamics

In the absence of a shaking table, some laboratories have developed simple simulators for dynamic testing of structures. One such kind of a facility, named as the shock table, is installed at the University of Roorkee, India and was developed by Keightly.
Seismic Vulnerability Assessment of Structures

Seismic Vulnerability Assessment of Structures

Experimental testing may be adequate to determine the seismic performance of a single building. However, it is not feasible to determine the seismic performance of a building stock, located in a city, by experimentally testing their representative models.

Seismic Design Criteria in Earthquake Engineering

Apart from structural design and safety there are a lot of other factors that are to be considered as key players in the field of design and construction. Let's take the simple case of civil engineering that mostly deals with building design and construction.
Pseudo Dynamic (PsD) Testing Facility

Pseudo Dynamic (PsD) Tests - Non Linear Structural Dynamics Techniques

PDT is a substructure technique which includes applying slowly varying forces to a structural model. The motions and deformations observed in the test specimens are used to infer the inertial forces that the model would have been exposed to
Quasi Static Test Procedure and Analysis

Quasi Static Test - What, Why, How

The quasi-static cyclic tests can be used to conduct both basic and proof tests. In quasi-static tests, loads and/ or displacements are applied at slow rates. Normally, such types of tests are carried out to study structural performance of structures and structural
Earthquake Resistant Buildings Design

Earthquake Resistant Buildings Design

Earthquake causes shaking of the ground. So a building resting on it will experience motion at its base. From Newton's First Law of Motion, even though the base of the building moves with the ground, the roof has a tendency to stay in its original position.
Failure Modes of Brick Masonry Buildings

Failure Modes of Brick Masonry Buildings

Vibrations caused by earthquakes generate additional loading. Shear stresses develop which cause damage to structural elements. Since masonry, which can be stressed relatively high in compression, is weak in resisting bending and shear.
Seismic Retrofitting Techniques

Seismic Retrofitting Techniques

Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to earthquakes. With better understanding of seismic demand on structures.
PreCast Concrete Slabs

PreCast Concrete in Earthquake Regions

Based on experience in past earthquakes in Eastern European and in Central Asian countries where these systems have been widely used, it can be concluded that their seismic performance has been fairly satisfactory. when it comes to earthquake performance, the
Advanced Dynamic Testing Techniques

Advanced Dynamic Testing Techniques

A test specimen is subjected to slowly changing prescribed forces or deformations by means of hydraulic actuators. Inertial forces within the structures are not considered in this method. Purpose is to observe the material behavior of structural elements,

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