April '23
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The IUP Journal of Structural Engineering
ISSN: 0974-6528
A 'peer reviewed' journal distributed by EBSCO and Proquest Database
Structural engineering is usually considered as a specialty discipline within civil engineering, but can also be studied in its own right. It is the science and art of designing and making buildings, bridges, frameworks and other similar structures. It has taken a completely different path since the middle of the 20th century. It involves understanding the load-resisting properties of components such as beams, columns, walls, slabs, plates, arches, shells, catenaries, etc., and selecting, proportioning, and connecting different components of a structure to resist the forces and displacements without affecting the safety of the structure. Structural Engineers are responsible for using funds, structural elements and materials creatively and efficiently. In recognition of the growing importance of this branch of engineering, IUP has come up with a quarterly journal, The IUP Journal of Structural Engineering.
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Response of Cooling Tower Shell to Wind Loads
The paper aims at studying the structural response of cooling tower shell under wind loading. The calculated wind pressure is applied on a cooling tower at different heights and circumferential angles. The analysis is carried out for different shell thicknesses using FEA, and the response of cooling tower shell is observed in terms of deflection, hoop and meridional forces at 0° meridian. The circumferential pressure distribution given in IS 11504: 1985 code is expressed as Fourier cosine series in the present study, and the calculation is carried out for 15° interval and compared with the coefficients obtained from IS 875 (Part 3): 1987. It is observed that the deflection of cooling tower shell decreases, whereas the hoop and meridional forces increase with increase in shell thickness. The hoop and meridional forces are not much affected above throat level for different shell thicknesses.
Characterization and Implementation of ADAS Type Hysteretic Damping Device in Steel Structure
The paper explains the impact of metallic dampers on the seismic performance of a nine-story steel moment frame. The design technique for an X-shaped Added Damping and Added Stiffness (ADAS) type steel damper is examined. With a minimal activation load, the damper is designed to give well before the building yields. A series of Finite Element (FE) simulations were used to verify the performance of the proposed device under constant and increasing cycle loads. The suggested steel dampers exhibited comparable hysteretic curves and steady hysteretic behavior, according to the simulation findings. ABAQUS software was used for FE analysis. Then, utilizing El centro (1940) ground motion recordings in SAP2000 software, nonlinear time history studies were done to evaluate the seismic behavior of steel frames using this sort of passive control system. Through the dampers, the seismic reactions of the frames were investigated and compared in terms of maximum displacement, maximum story drift, roof displacement time history, input energy and dissipated energy. The results showed that the constructions with dampers outperformed the original structure in terms of seismic performance.
Bagasse Ash as Partial Cement Replacement Material: An Evaluation
The paper evaluates sugarcane Bagasse Ash (BA) as a partial cement replacement material. Sugarcane BA is a byproduct of fuel blending in the sugar industry. It is the residual waste that remains after the economically viable sugar has been extracted from the cane. The disposal of the sugarcane waste in agriculture causes environmental problems. The cement industry also creates environmental problems due to carbon dioxide emissions during cement manufacturing. Initially, BA samples were collected from the rubble of the Arjo Didessa Sugar Factory. The crude BA was sieved with a 250 μm size sieve. The strength of grade C-25 concrete was designed using five different concrete mixture proportions ranging from 5 to 20% cement by weight, including a water-cement ratio of 0.45. The impact strength tests were conducted at 7, 14, 21 and 28 days of age for each replacement ratio. For the experimental work, a total of 60 cubic concrete specimens were cast for compressive strength tests and 15 cylindrical concrete specimens were cast for water absorption tests. Working compressive strength results indicated that BA could replace up to 5% of ordinary Portland cement concrete.
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