Dynamic Properties of Confined Masonry Buildings through Ambient and Forced Vibration Testing [Agency: Council of Scientific and Industrial Research (CSIR); Scheme No.22(762)/17/EMR-II]

Theme / Problem Statement: Identifying natural frequencies and mode shapes through Ambient and low amplitude forced vibration signatures.

Research Objectives:

1. Experimentally evaluating the natural period (and mode shape) of confined masonry buildings
2. Develop functional form for natural periods and calibrate with experimental data
3. Assessing the damping ratio from the recorded signature
4. To investigate the distribution of base shear along the height
5. Assessing Indian Standard and making appropriate recommendations for confined masonry buildings

Methodology:

1. Perform Ambient Vibration Testing
2. Perform Forced Vibration Testing
3. Process Experimental Data to obtain Dynamic Properties
4. Develop Empirical Equation for Natural Period of Confined Masonry Buildings
5. Base Shear Distribution along the Height in Confined Masonry Buildings

Expected Outcome and Deliverables of the Project:

1. Recommendation on natural period equation for seismic design of confined masonry buildings
2. Recommendation of damping ratio for seismic design of confined masonry buildings
3. Recommendation on distribution of base shear along the height for confined masonry buildings

Publication out of this Project:

• Basu, D. (2019). “Simplified analysis of confined masonry buildings with asymmetry for force based seismic design.” Journal of Building Engineering, Elsevier. Vol. 21: 455–467.
• Nema, H. and Basu, D. (2019). “Natural Properties of Confined Masonry Buildings–Experimental Case Studies and Possible Inference” International Journal of Masonry Research and Innovation, Inderscience, UK. Vol. 4(3): 197–226
• Chakra-Varthy, P. and Basu, D. (2021). “Natural Period and Vertical Distribution of Base Shear in Confined Masonry Buildings using Ambient Vibration Test,”  Bulletin of Earthquake Engineering  (in press).