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RISS 인기검색어
- 검색키워드
- 저자 : Rajsekhar, K. (검색결과 4 건)
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Rajsekhar Chakraborty,Swades Pal 대한공간정보학회 2020 Spatial Information Research Vol.28 No.6
The present work intends to predict char area in river Ganga from Rajmahal to Farakka barrage using advance machine learning models for justifying the sustainable habitability of the charland. Artificial neural network (ANN), end point rate and linear regression for spatial and ANN, radial basis function, random forest, support vector machine (SVM) models for numerical charland prediction are used. Historical charland study since 1990 to 2018 exhibits 34.32% increase 46.86% decrease of total charland and river flow areas respectively. Amongst the spatial prediction models ANN has effective predictability with acceptable performance level. In coming 20 years no significant change will happen in case of Bhutni and Piarpur charland. Amongst the numerical models by 2038 charland area is likely to be expanded as predicted by ANN and SVM models with statistical significance. Based on the findings it can be recommended that for predicting dynamic charland area ANN model could be used both at spatial and numerical scales. The findings also exhibits that charland area is expected to be enhanced and it has immense planning importance specially for finding habitability in charlands.
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Rajsekhar Chakraborty,Swapan Talukdar,Tithankar Basu,Swades Pal 대한공간정보학회 2018 Spatial Information Research Vol.26 No.5
The present paper intends to delineate flood plain wetland in Tangon river basin (1988–2016) from Landsat images and to investigate the nature and causes behind squeezing wetland and losses. From the analysis it is found that the total recognized average wetland area in pre monsoon season and post monsoon season are respectively 13.37 and 67.05 km2 in post dam period whereas in pre dam period it was 12.75 and 77.78 km2 respectively. Flow reduction due to damming over Tangon in 1989 is one of the major causes behind squeezing wetland area. Agriculture extension replacing shallow and seasonal wetland, disconnection of discharge contributing Karatoya river form Tangon river, gradual disconnection with ground water column are the crucial reasons for growing wetland habitat quality. Inconsistent water supply, frequent drying up of wetland fringe area withstand against health of the wetland habitat. Considering the causes of habitat crisis, immediately agricultural extension reclaiming wetland should be stopped, ecological flow should be allowed from dam. These steps could minimize the growing habitat crisis in the study region.
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Performance of non-prismatic simply supported prestressed concrete beams
P. Markandeya Raju,K. Rajsekhar,T. Raghuram Sandeep 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.4
Prestressing is the most commonly employed technique in bridges and long span beams incommercial buildings as prestressing results in slender section with higher load carrying capacities. Thiswork is an attempt to study the performance of a minimum weight prestressed concrete beam adopting a non-prismatic section so that there will be a reduction in the volume of concrete which in turn reduces the self-weight of the structure. The effect of adopting a non-prismatic section on parameters like prestressing force, area of prestressing steel, bending stresses, shear stresses and percentage loss of prestress are established theoretically. The analysis of non-prismatic prestressed beams is based on the assumption of pure bending theory. Equations are derived for dead load bending moment, eccentricity, and depth at any requiredsection. Based on these equations an algorithm is developed which does the stress checks for the givensection for every 500 mm interval of the span. Limit state method is used for the design of beam and finitedifference method is used for finding out the deflection of a non-prismatic beam. All the parameters of nonprismatic prestressed concrete beams are compared with that of the rectangular prestressed concrete members and observed that minimum weight design and economical design are not same. Minimum weight design results in the increase in required area of prestressing steel.
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Performance of non-prismatic simply supported prestressed concrete beams
Raju, P. Markandeya,Rajsekhar, K.,Sandeep, T. Raghuram Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.52 No.4
Prestressing is the most commonly employed technique in bridges and long span beams in commercial buildings as prestressing results in slender section with higher load carrying capacities. This work is an attempt to study the performance of a minimum weight prestressed concrete beam adopting a non-prismatic section so that there will be a reduction in the volume of concrete which in turn reduces the self-weight of the structure. The effect of adopting a non-prismatic section on parameters like prestressing force, area of prestressing steel, bending stresses, shear stresses and percentage loss of prestress are established theoretically. The analysis of non-prismatic prestressed beams is based on the assumption of pure bending theory. Equations are derived for dead load bending moment, eccentricity, and depth at any required section. Based on these equations an algorithm is developed which does the stress checks for the given section for every 500 mm interval of the span. Limit state method is used for the design of beam and finite difference method is used for finding out the deflection of a non-prismatic beam. All the parameters of nonprismatic prestressed concrete beams are compared with that of the rectangular prestressed concrete members and observed that minimum weight design and economical design are not same. Minimum weight design results in the increase in required area of prestressing steel.
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