ANALYSIS OF MASONRY BUILDING FOR SEISMIC SAFTEY
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Transcript of ANALYSIS OF MASONRY BUILDING FOR SEISMIC SAFTEY
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ANALYSIS OF MASONRY BUILDING FOR SEISMIC SAFTEY
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Team Members
• Rahul M• Aravind K• Arun M• Neethu TG
Guided ByDr. A PraveenPCE RIT
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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.
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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.
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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
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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
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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)
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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
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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
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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=
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COMPARISION AND ANALYIS OF USER INPUT PLAN AND SOTWARE OUTPUT PLAN
USER INPUT SOFTWARE OUTPUT
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USER INPUT SOFTWARE OUTPUT
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USER INPUT SOFTWARE OUTPUT
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THANK YOU