Direct Design for Multiple Load Cases: Reinforced and Partially Prestressed Concrete Beams Under Combined Bending and Torsional Loads

[摘要] This thesis reports experimental and theoretical investigations on reinforced and partially prestressed concrete beams subjected to multiple combinations of bending and torsional loads. The beams were idealised as hollow beams with the walls in a state of plane stress. Elastic stress field at ultimate load in conjuction with a yield criterion was used to obtain the required quantities of reinforcement. The type of yield criteria adopted in this study is the classical ultimate limit capacity concept originated by Nielsen. The experimental study consisted of testing four reinforced concrete beams and two partially prestressed concrete beams. All the beams were 300mm square and hollow. The parameters investigated were load combinations and load history. The test results indicate that the adopted approach satisfactorily predicts the ultimate strength of the beams under multiple combinations of bending and torsional loads. A plane stress finite element program was used to carry out a non-linear analysis of the experimental test beams. Good agreement was obtained between theoretical results assuming monotonic proportional loading and the overall behaviour of tested beams.

[发布机构] University:University of Glasgow

[关键词] Civil engineering