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Behavior of Reinforced Concrete Frame with Masonry infill Walls having Opening Subjected to Lateral Loading
No full textThis thesis is submitted to the Department of Civil Engineering, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Science in Civil Engineering, November 2018.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 91-96).Reinforced Concrete frames having masonry infill have been widely used in building
system. The ground floor is generally open for car parking or other facilities in this type of
building. It is a common practice in conventional structural design of buildings often to
ignore the interaction of masonry infill with the frame. But observations of past research
have revealed that the actual behavior of infill frame with open ground floor due to lateral
loading is significantly different to that of bare frame. Therefore, an extensive
experimental analysis in the laboratory and computational analysis in software have been
performed to study the behavior of masonry infill Reinforced Concrete frames having
opening keeping open ground floor subjected to lateral loading.
In the experimental work, three different types of specimen such as two storied single bay
RC bare frame, infill frames having door and window opening have been constructed and
tested under in-plane lateral loading. A total of 36 numbers of building frames without
infill and with infill having opening of door and window have been analyzed in
STAAD.Pro software for parametric study considering variation in number of floor and
beam-column aspect ratios by Equivalent Static Analysis (ESA) and Response Spectrum
Analysis (RSA). The masonry infill has been modeled as equivalent diagonal strut and the
size, shape and other properties have been calculated using different published equations
of literature. Bangladesh National Building Code has been followed for earthquake load in
the analysis and base shear, sway, inter story drift, bending moment, and shear in ESA and
RSA of these frames are evaluated and compared.
It has been observed from experimental analysis that the strength and stiffness have been
increased and displacement is reduced for RC infill frame having opening than bare frame.
First crack is observed as flexure crack at ground floor beam for bare frame and stair crack
at the infill for infill frame having opening. From parametric study it is noticed that the
presence of infill walls in upper stories make those floors much stiffer compared to ground
floor resulting major deflection at ground floor level. The bending moment and shear force
are also concentrated at ground floor level where infill walls are absent in both ESA and
RSA. The maximum moment and shear in RC infill frame having opening is decreasing
significantly in RSA compared to ESA due to interaction of infill to the frame. Thus
Equivalent Static Analysis showed conservative results compared to Response Spectrum
Analysis for conventional design of buildings as bare frame.Abu Sayed Mohammad AkidMaster of Science in Civil Engineerin
Analysis of Structural Electronic and Vibrational Properties of Two Dimensional Silicon Carbide
No full textThis thesis is submitted to the Department of Electrical and Electronic Engineering, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Science in Electrical and Electronic Engineering, May 2018.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 59-65).Two dimensional silicon carbide (2D-SiC) has fascinated incredible research attention recently because of its large direct bandgap and high exciton binding energy. Nonetheless, no well-established researches have been performed on 2D-SiC combining its physical, electronic and vibrational properties. Here, we have investigated the details of the full physical picture of novel 2D-SiC describing their structures and functions as well as the electronic tunability and phonon properties using the first principle density functional theory. The structural properties show that 2D-SiC has the honeycomb graphene like structure with lattice constant 5.72 Ry (3.101 A). The positive phonon modes in the vibrational properties indicate that the plane structure of 2D-SiC is dynamically stable. The calculated projected density of states (PDOSs) have exposed that the conduction and valence band edges at the K point have been constructed by the π and π*-bands, which are formed due to the bonding and anti-bonding combination of Si-3pz and C-2pz orbitals.
The electronic properties of semiconductor materials are greatly influenced by the spin orbit coupling (SOC) effect. The effects of SOC on the electronic structure of 2D-SiC have been studied using the first-principle calculation which is implemented on quantum espresso 6.1 version. Though the electronic band structure shows that the 2D-SiC monolayer possesses a direct band gap of 2.71 eV, the electronic band become split and the band gap turns to 2.827 eV while considering the SOC effect. It is found that SOC induces splitting in both valence and conduction bands of this material. A SOC induced bandgap on the order of 117 meV has been generated at the K-point. The calculated partial electron density of state exposes that the silicon 3p electrons and carbon 2p electrons are critical in forming the electronic bandgap. Phonon density of states, thermal properties, Raman and Infrared spectra of this material have been also calculated. In addition, the effect of Si and C vacancies on the electronic properties of 2D-SiC has been addressed with and without considering SOC effect. These findings suggest that the monolayer 2D-SiC may present a new platform of 2D materials, with a rich variety of properties for applications in electronics, optoelectronics and spintronics devices.Md. Rasidul IslamMaster of Science in Electrical and Electronic Engineerin
Sensitivity of Tropical Cyclone Mahasen to Physical Parameterization Schemes using Weather Research & Forecasting (WRF) model
No full textThis thesis is submitted to the Department of Physics, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Philosophy in Physics, January 2018.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 107-115).In this study, the sensitivity of numerical simulations of tropical cyclone to physical
parameterizations is carried out with a view to determine the best set of physics options for
prediction of cyclones originating in the north Indian Ocean. For this purpose, the tropical
cyclone Mahasen that formed in the Bay of Bengal and crossed Bangladesh-Myanmar coast
in the month of May, 2013 has been simulated by the advanced (or state of science)
mesoscale Weather Research and Forecasting (WRF) model with the available physical
parameterizations. To determine on the prediction of track and intensity of Tropical Cyclone
Mahasen has been used single domain with latitude from 2.0450 N to 26.4800N and longitude
from 73.960 E to 97.040E. Domain has been used 12 km horizontal resolution. Different run
and different physical parameterizations have been used available in the model. The different
physical parameterizations schemes are KF, BMJ , GF, OSAS and Grell-3 for Cumulus;
YSU, MYJ, GBM, MYNN3, ACM2, MYNN2, BouLac, UW, TEMF and MRF for Planetary
Boundary Layer; WSM6, Kessler, Purdue Lin, WSM3, WSM5, Eta, Thompson, Morrison
2-mom, CAM5.1, SBU-Ylin, WDM5, WDM6, NSSL 2-mom, NSSL 2-mom-CCN, NSSL
1-mom and NSSL 1-momlfo for Microphysics; UNLS, TDS, RUC, NLS, CLM4.0 and PXS
for Land surface model; Dudhia, GSFC ARW+Chem(τ), CAM, RRTMG, New Goddard and
FLG for Short Wave Radiation; RRTM, CAM Long wave (CAM), RRTMG, New Goddard
FLG and Held-Suarez for Long Wave Radiation that have been used for the purpose to test
the Sensitivity of Tropical Cyclone Mahasen to Physical Parameterization Schemes using
Weather Research & Forecasting (WRF) model. Three parameters track, wind speed and
CSLP has been used for calculating Root Mean Square Error (RMSE) to find the best
physical made using parameterizations option with respect to observed. Finally Betts Miller
Janjic (BMJ) for Cumulus, Medium Range Forecast Model (MRF) for Planetary Boundary
Layer (PBL), WRF Single Moment 3-class simple ice scheme (WSM3) for Microphysics
(MP), Unified Noah land-Surface Model (UNLS) for Land surface model (LSM), Dudhia
(MM5) for Short Wave Radiation (SWR) and Rapid Radiative Transfer Model (RRTM) for
Long Wave Radiation (LWR) were found the best among available physics option.Samir Kumar DebnathMaster of Philosophy in Physic
Implications for Instrumental Neutron Activation Analysis (INAA) to Study Bhairab River Sediments using Research Reactor Based Gamma Spectrometry
No full textThis thesis is submitted to the Department of Physics, Khulna University of Engineering & Technology in partial fulfillment of the requirements for the degree of Master of Science in Physics, April 2018.Cataloged from PDF Version of Thesis.Includes bibliographical references (pages 89-94).Pollutions are increasingly becoming great concerns for human beings. The present study
investigates the distribution and contamination of trace elements in the sediment samples
of the Bhairab River, passing through the Khulna city, Bangladesh. Instrumental Neutron
Activation Analysis (INAA) method has been used for analyzing the sediment samples
collected from Bhairab River during September-october’2016. Quality control of the
analysis has also been performed by analyzing certified reference materials IAEA-Soil-7.
The irradiation of the samples and standards have been performed using 3 MW TRIGA
Mark-II Research Reactor and the gamma-ray spectrometry has been performed by High
Purity Germanium (HPGe) detector system. Total element of 28 like Na, Mg, Al, K, Ca,
Sc, Cr, Mn, Fe, Co, Zn, Ga, As, Br, Sb, Cs, Ba, Ce, Nd, Eu, Tb, Dy, Ho, Tm, Yb, Lu, Ta,
and W has been determined from ten sediment samples collected from different areas of
the Bhairab River. In this experiment, NIST-1633b (coal fly ash) has been used as the
standard and the analytical accuracy and precisions have been ensured by the repeated (n =
4) analysis of IAEA-Soil-7. Both geochemical and anthropogenic origins of heavy metals
(HMs) are considered during the evaluation of compositional trends by the environmental
indices such as contamination factor (CF), pollution load index (PLI), geo-accumulation
index (Igeo) and enrichment factors (EF). Experimental evidence as pollution level of
pollutants evaluated by different pollution indices suggests that Bhairab river sediments are
less contaminated. The calculated pollution load index values also suggest the corrosion of
the sediment quality and to be helpful to set a picture of metal contamination of the
Bhairab River and will be able to find out the elemental abundances of the sediments.Sheikh Md. Anowar HossainMaster of Science in Physic