J Visuvasam

Bio: J Visuvasam is an academic researcher from VIT University. The author has contributed to research in topics: Pile & Seismic analysis. The author has an hindex of 2, co-authored 5 publications receiving 8 citations.

Comparative Study on Various Behaviours of an RC Structure with Prestressed Concrete Structure

Abstract: Aesthetics of a structure are given primary importance in the present days and this demands new and challenging designs with large spans and complicated designs. The role of a structural engineer becomes more significant because of these structural irregularities. This makes it necessary to have advanced technologies like post-tensioning if we are not ready to compromise in the aesthetics. Generation of such irregular structures will form varying mass and stiffness distribution which imparts to the effect of torsion. This paper deals with the various structural behaviour of a multi-storied RC Convention Centre building having large spans of around 32 m. The effect on the structure due to these large spans is compared with both RC and prestressed concrete. The roof slab of the auditorium portion of the structure is designed with normal RCC and compared with Slabs resting on Prestressed Post-tensioned Girders using the software Adapt Builder 2016. A comparative study between RCC and prestressed concrete is also done. Diaphragm action of the structure is considered for seismic design in order to provide a monolithic action and hence to counteract the effect of torsion. A comparative study is done with and without considering the effect of torsion into account and the results shows that in higher seismic zones the effect of torsion is predominant and proper care should be given to extreme columns and corner columns which are more vulnerable to failure. Response spectrum analysis of the structure is done in STAAD.Pro and storey response plots are obtained.

Static behaviour of 3x3 pile group in sand under lateral loading

Abstract: This paper presents the static lateral load behaviour of single pile in comparison with 3x3 pile group in sand. The piled raft system is modelled using PLAXIS3D. Parametric studies of varying length to diameter (L/D) and spacing of piles in a group and diameter of piles (S/D) have been performed. The behaviour of group piles in terms of static lateral load capacity and group efficiency has been discussed.

Effect of Lintel Beam on Seismic Response of Reinforced Concrete Buildings with Semi-Interlocked and Unreinforced Brick Masonry Infills

Abstract: The primary focus of this study is to evaluate the nonlinear response of reinforced concrete (RC) frames with two types of brick infills viz., unreinforced brick masonry infill (URM) and semi-interlocked brick masonry infill (SIM) together with lintel beams, subjected to seismic loads. The seismic response is quantified in terms of response reduction factor and base shear. Infill walls are modeled using double strut nonlinear cyclic element. Nonlinear static adaptive pushover analysis is performed in the finite element program SeismoStruct. The response reduction factor (R) is computed from adaptive pushover analysis and performance for all models is obtained. The results showed that the average R factor of the RC framed structure with semi-interlocked masonry (SIM) is 1.31 times higher than the RC frame with unreinforced masonry (URM) infill. The R value of the bare frame with the lintel beam is found to be less than the corresponding value recommended in the Indian Standard Code. The results obtained in this study highlight that if the impacts of lintel beams and various brick infill scenarios are considered in the RC frames then the R values used for the design of RC frame buildings with infills would be underestimated (i.e., the evaluated R values are greater than the R values used for the design purpose).