IJATSER Volume 3 – Issue 2, June 2018 Edition

All listed papers are published after full consent of respective author or co-author(s).
For any discussion on research subject or research matter, the reader should directly contact to undersigned authors.

IIJ03-02-01Analysis Of Fundamental Natural Period For Irregular Rcc Framed Structure

AUTHORS: Anil Kumar Yadav, Prof. Kapil Soni

ABSTRACT:-The determination of the fundamental natural period of vibration is essential to design a structure against earthquake loading. Current design codes in India such as IS 1893(Part 1):2002 or IS 875 (Part III):1987 provide formulas for the   approximate   period   of   earthquake-resistant building systems, which  are  dependent  only  on  the  height  of   the structure or number of stories. Such a formulation is  overly conservative  and unable  to  account for   structures with   geometric   irregularities.   This   study   investigates the   fundamental periods of different types of reinforced concrete earthquake resistant building structures having   structurally   irregular   frames   (both vertical and horizontal). A total of 66 MRF structures for set-back, 168 MRF structures for   mass irregularity, 90 MRF structures for soft-storey irregularity, 72 MRF structures for re-entrant corner irregularity and 160 MRF structures for torsional irregularity due to heavy mass   are   analyzed   with   STAAD.Pro-V8i. The fundamental periods based on vibration theory for   each example were compared with current code equations. Through statistical comparison, it was found that a multi-variable power model which is able to account for irregularities resulted  in  a  better  fit  to  the  Rayleigh  data  than  equations  which  were dependent on height only. The proposed equations were validated through a comparison of   available   measured   period data. These proposed equations will allow design engineers to quickly and accurately estimate the fundamental period of moment  resisting  frame structures by taking into account these types of irregularities.

KEY WORDS: – Seismic analysis, Fundamental Natural period analysis, setbacks, Mass irregularity, Vertical irregularity, Time Period.


IIJ03-02-02Multi-level inverter topology and Modulation techniques; A technical survey

AUTHORS: Ashish Nayak, Vinay Pathak, Namrta Sant and Nitesh Singh

Abstract— Multi-level inverter have wide range of applications. Starting from medium voltage level for laboratory usage to high voltage level for industrial MLI are applicable. They have very versatile design feature which help them to adopt to any applications. Their application as power converter to integrate non-conventional Dc sources are becoming popular since they have low harmonic content, less electro-magnetic interference and very small power dissipation. This paper presents the review on commonly used MLI topology and their modulation techniques.

Index Terms— Multilevel inverter (MLI), Neutral point clamped (NPC), Flying capacitor, Cascaded H-bridge, SPWMS, VMSHE-PWM, Sigma–delta modulation.



AUTHORS: Ankur Prasad Mishra,Prof. Rachana Bajaj

ABSTRACT:-The determination of lateral earth pressure against the retaining wall is one of the oldest topics in Civil Engineering. Retaining wall with pressure relief shelves is the special type of retaining wall. High R.C.C retaining walls may be used economically by providing relief shelves on the backfill side of retaining wall. Such walls are called as “Retaining Walls with Pressure Relief shelves”. Although the horizontal shelve is used to reduce the active earth pressure force. The literature review says that; there is a lot of scope available for performing study in this area. Theoretical analysis of retaining wall with shelves has not been carried out by using Rankines theory. Raychaudhary adopted Coulomb’s theory in his study, which has many deficiencies. In the present study an attempt has been made here to study the behavior of a retaining wall with one or more relief shelves and a theory has been proposed which agrees fairly well with experiments conducted on a model.The conclusions in this thesis drawn based on the discussion and results obtained analytically and using Staad-Pro. model study. The values obtained from analysis and design of retaining wall with and without shelves has been compare and conclusion has been drawn. Analytical results of active earth pressure, nodal reactions, and bending moments with pressure relief shelves have been close agreement with the Staad-Pro. software results.

KEY WORDS: – Active earth pressure, Ground bearing capacity, Pressure intensity, Bending moment, Vertical force