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RISS 인기검색어
- 검색키워드
- 저자 : K. Rajsekhar (검색결과 2 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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