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Devdas Menon
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Devdas Menon
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Devdas Menon
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Menon, Devdas
Menon, D.
Devdas, Menon
Menons, Devdas
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3 results
Now showing 1 - 3 of 3
- PublicationComparison of force-based and displacement-based methods for seismic design of buildings(01-04-2012)
;Varughese, Jiji Anna; Displacement-based design (DBD) methods are emerging as the latest tools for performance-based seismic design and as a viable alternative to conventional force-based design method (FBD). FBD starts with an estimation of base shear force, which is calculated based on the fundamental period and ductility capacity of the structure. This base shear force is distributed to the various floor levels based on the fundamental mode shape, and the structure is designed for these lateral loads. Unlike FBD, DBD method requires explicit consideration of displacements. Typically, DBD determines a target displacement demand and then calculates the required base shear capacity to achieve this demand. In this method, the lateral loads at various floor levels are obtained based on an assumed inelastic displacement profile. This paper presents the findings of a study that uses the FBD method and DBD method to design a typical four-storeyed and a nine-storeyed regular frame. The performances of the frames were assessed using nonlinear time history analysis and their relative performances are reported. - PublicationDisplacement-based seismic design of open ground storey buildings(01-01-2015)
;Varughese, Jiji Anna; Open ground storey (OGS) buildings are characterized by the sudden reduction of stiffness in the ground storey with respect to the upper infilled storeys. During earthquakes, this vertical irregularity may result in accumulated damage in the ground storey members of OGS buildings without much damage in the upper storeys. Hence, the structural design of OGS buildings needs special attention. The present study suggests a modification of existing displacement-based design (DBD) procedure by proposing a new lateral load distribution. The increased demands of ground storey members of OGS buildings are estimated based on non-linear time history analysis results of four sets of bare and OGS frames having four to ten storey heights. The relationship between the increased demand and the relative stiffness of ground storey (with respect to upper storeys) is taken as the criterion for developing the expression for the design lateral load. It is also observed that under far-field earthquakes, there is a decrease in the ground storey drift of OGS frames as the height of the frame increases, whereas there is no such reduction when these frames are subjected to near-field earthquakes. - PublicationReview of displacement-based seismic design methods of reinforced concrete regular frames(01-06-2012)
;Varughese, Jiji Anna; Structural displacement is now recognized as a key parameter for of structural and non-structural damage to a building during an earthquake. This paper reviews and compares some of the recently developed displacement-based seismic design (DBD) approaches, which promise a more rational design philosophy, compared to the conventional force-based design (FBD). This paper reviews six displacement-based procedures, and compares their relative performance, as applied to the seismic design of typical reinforced concrete (RC) moment-resisting frames of 4, 9 and 15 storeys located in zone V. Despite all methods using the same set of design parameters, a large variation in design strength and member sizes is observed. It is found that Performance-based Plastic Design (PBPD) and Direct Displacement-based Design (DDBD) methods give the most economical designs. The performances of these two methods were assessed by time history analyses using ten spectrum compatible earthquakes and it is found that both methods achieve the desired performance levels. However, there is scope to carry out further research and improve on these displacement methods, particularly for taller building frames.