I have been workin on a sandston monument Modhea Sun Temple. The Stresses generated in the temple after earthquake are 1/6th of he material capacity. The monument had retrofication work in 1971 and new sand stone was used for few windows and plinth region. After 2001 bhuj earthquake new sand stone work showed cracks but old sandstone structure did not showed any damage response. From the material aspects what could be the prime reason?
CHECKING the new sand stones against old sand stones for the shear capacity, as well as the subsidence of the foundation. I think you will find the reason clearly!!!
I did not considered the foundation effects. I have constructed the following attached model. The new sand stone was used just for window area and it has clearly shown shear cracking. Could you help me enlist some good reasons?
there is no attached model in your answer. Any way , shear cracking in windows areas is very common after an earthquake, due to horizontal forces. So some good reasons are insufficient shear capacity of the wall , foundation movements, the loads of the the roof with big mass, causes horizontal forces to the wall, so there is shear failure nad shear cracks. If you can send me the model of the wall to have more clear view.
One reason you get cracks at the corners of windows in an earthquake is because of the stress concentration effect. If you replace old (deteriorated) masonry by new masonry then (everything else being equal) similar loads (another earthquake) are going to cause the structure to fail in the same place.
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