Direct Design of Partially Prestressed Concrete Beams for Combined Bending and Torsion

[摘要] The thesis reports experimental and theoretical results on partially prestressed beams subjected to combined torsion and bending. The models were designed using the classical limit state concept of Nielsen using elastic stress field at ultimate load. The experimental study consisted of testing six partially prestressed hollow concrete beams of square cross-section (300X300)mm. The main variables studied in this investigation are the amount of effective prestress and the corresponding area of steel designed according to Nielsen for a combined action of bending and torsion. The experimental data obtained indicated that the adopted approach showed satisfactory behaviour in terms of predictions of the ultimate strength of the beams and behaviour at serviceability loads under combined bending and torsion. The theoretical study was done using non-linear plane stress finite element programme. The finite element model provided fairly satisfactory agreement with experimental results.

[发布机构] University:University of Glasgow

[关键词] Civil engineering