【摘要】 本文运用现有的3个计算无粘结预应力钢束的极限应力公式,基于3组体外预应力钢束梁和FRP束梁的实验数据,比较和分析了各种材料体外束的应力增量、极限应力和梁抗弯强度计算值与实验值的偏差,指出了现有公式用于体外束应力计算的局限性,以及转向块与端锚间的特殊2次效应对体外束梁破坏形态和束内应力增量的影响。更多还原

【Abstract】 The ultimate stress increment of external cable and flexural strength of beams are evaluated using 3 existing equations for unbonded steel cables and compared with 3 groups of specimens with external steel and FRP cables.The limitations of the equations are pointed out in the external cable′s cases and the special secondary effect arising from the deviator and the end anchorage on the stress increment and beam′s failure mechanism are illustrated.更多还原