Differences in moment redistribution in concrete beams prestressed with bonded and unbonded tendons

[摘要] The redistribution of bending moments occurs as aresult of a change in stiffness or the appearance ofplastic hinges or both at the same time. In reinforcedand prestressed concrete beams, the change in stiffness maybe a result of cross-section cracking. Taking moment redistribution into account in the calculation of the ultimate limitstate may lead to a more economical and efficient design.Moreover, the failure load depends on the extent of momentredistribution before failure. If the required rotation isgreater than the available rotation, the beam will fail beforereaching the plastic collapse. That is partial redistribution,whereas full redistribution accompanies the development ofa plastic collapse mechanism.

[学科分类] 建筑学