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RISS 인기검색어
- 검색키워드
- 저자 : P. Markandeya Raju (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
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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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Settlement analysis of pile cap with normal and under-reamed piles
Madisetti Pavan Kumar,P. Markandeya Raju,G. Vincent Jasmine,Mantini Aditya 사단법인 한국계산역학회 2020 Computers and Concrete, An International Journal Vol.25 No.6
The use of pile foundations has become more popular in recent years, as the combined action of the pile cap and the piles can increase the bearing capacity, reduce settlement, and the piles can be arranged so as to reduce differential deflection in the pile cap. Piles are relatively long, slender members that transmit foundation loads through soil strata of low bearing capacity to deeper soil or rock strata having a high bearing capacity. In this study analysis of pile cap with considering different parameters like depth of the pile cap, width and breadth of the pile cap, type of piles and different types of soil which affect the behaviour of pile cap foundation is carried out by using Finite Element Software ANSYS. For understanding the settlement behaviour of pile cap foundation, parametric studies have been carried out in four types of clay by varying pile cap dimensions with two types of piles namely normal and under-reamed piles for different group of piles. Furthermore, the analysis results of settlement and stress values for the pile cap with normal and under-reamed piles are compared. From the study it can be concluded that settlement values of pile cap with under-reamed pile are less than the settlements of pile cap with normal pile. It means that the ultimate load bearing capacity of pile cap with under-reamed piles are greater than the pile cap with normal piles.
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