VOLUME 3 ISSUE 2
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.
IIJ03-02-01: Analysis 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.
IIJ03-02-02: Multi-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.
IIJ03-02-03: STATIC ANALYSIS AND DESIGN OF RETAINING WALL WITH AND WITHOUT SHELVE USING SOFTWARE
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