analysis of masonry building for seismic saftey

ANALYSIS OF MASONRY BUILDING FOR SEISMIC SAFTEY

Team Members

• Rahul M• Aravind K• Arun M• Neethu TG

Guided ByDr. A PraveenPCE RIT

NEED OF ANALYSIS ON MASONRY BUILDINGS

• In India more than 80% of the buildings are of masonry .• When they are subjected to earthquake loading their seismic

assessment becomes a challenge• Masonry structures are brittle, but the buildings need to be

ductile to withstand earthquake forces.• Most cases small scale buildings are constructed without any

earthquake resistivity and 80% of them are of masonry• Therefore the analysis on masonry buildings on earthquake

resistance is very vital.

NEED OF VULNERABILITY MAPPING• Helps to identify the geographical conditions of an

area so that proper disaster management techniques can be applied.

• Knowing the type of construction, type of structures, nature of soil are vital in determining the type of failure that can occur in an area

• It helps to identify the nearest hospitals or health centers that can be approached

• Provide suggestions for future constructions.

• It helps to predict the area where the buildings need to be constructed with extra seismic resistance.

• It helps to forecast the damage and cost of an earthquake in a region.

MAP WINDOW

* It is an open source GIS software which we used for mapping the vulnerability points on a map.

* Using map window we can geo reference the map with the local latitudes and longitudes.

* Data we collected from field survey are fed in to the software database

* With the help of its inbuilt query system we can identify the points of interest easily

STRUCTURAL EVALUATION OF MASONRY BUILDINGS

*LOCATION OF CENTRE OF MASS

*LOCATION OF CENTRE OF RIGIDITY

*BASE SHEAR CALCULATION

*DISTRIBUTION OF SHEAR FORCE INTO THE WALLS

LOCATION OF CENTRE OF MASS

• Centre of mass is calculated by taking statistical moments about a point, say lower left corner, using respective weights of walls.

• ,

(where is the weight of individual walls)

LOCATION OF CENTRE OF RIGIDITY• Centre of rigidity is calculated by taking statistical moments about a point, say lower left corner using relative stiffness of walls in respective direction considered.

• are stiffness of individual walls in x& y direction resp.

• Torsional Eccentricity

BASE SHEAR CALCULATIONas per IS 1893 ( Part 1 ) : 2002 ,cl 7.5.3)

• VB=Ah W• W=>seismic weight of building• Ah=>Design horizontal acceleration spectrum value= • Z=>Zone factor

• I=Importance factor

• R=Response reduction factor

• Sa/g=>acceleration coefficient

DISTRIBUTION OF SHEAR FORCE INTO WALLS

Total SF = Direct SF + Torsional SF

Direct SF in X/Y direction= base shear in X/Y Relative Rigidity of wall

Torsional shear force in X direction=

Torsional shear force in X direction=

COMPARISION AND ANALYIS OF USER INPUT PLAN AND SOTWARE OUTPUT PLAN

USER INPUT SOFTWARE OUTPUT

USER INPUT SOFTWARE OUTPUT

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USER INPUT SOFTWARE OUTPUT

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THANK YOU