1991 Volume 29 Issue 9 Pages 19-27
Recently the design for torsion has become an increasingly greater important for constructions of large, curved or slender concrete structures in the ocean and underground. This paper deals with the elemental and useful information for design of torsional stresses by elastic and plastic analyses, the torsional reinforcement and torsional resistance by space truss model. The theories of simple torsion, warping torsion and plastic torsion are explained to design the torsion problems of cracking moment, the resistance moment without torsional reinforcement and decision on the requirement condition of reinforcement. There are two analyses to estimate the ultimate torsional strength of reinforced concrete member. One is space truss model and the other is skew-bending model. On the space truss model it is available to design the torsional reinforcement and analyze the behaviour of the reinforced members subjected to combined torsion and bending. Therefore this model is generally used to design and on the base of the model the torsional reinforcement and resistance are assessed to design the concrete structures.
