【摘要】 推导了将曲线无粘结预应力束视为位移变量直接求解的预应力钢混凝土组合梁单元的有限元列式,并对用于试验的2根无粘结和2根有粘结的预应力混凝土钢连续组合梁进行了分析,计算曲线与试验曲线吻合较好。通过有限元分析发现,无粘结预应力钢混凝土组合梁的极限承载力略小于有粘结预应力混凝土钢组合梁,其原因是组合梁内无粘结预应力钢筋的极限应力低于有粘结预应力筋的;而在负弯矩区采用直线配束或曲线配束对无粘结预应力筋的极限应力影响很小。更多还原

【Abstract】 The formulas for finite element analysis are derived regarding the curved unbonded tendons as displacement variable to avoid iterative calculation,and two unbonded prestressed composite steel-concrete beams and two bonded prestressed ones are experimented and analyzed,and good agreement is obtained between the test and predicted results.The experimental and analysis results indicate that the loading capacity of the unbonded prestressed steel-concrete composite beams is less than that of the bonded prestressed ones,and there is little difference in ultimate stress between straight tendons and curved tendons in terms of tendon profile used in negative moment zone.更多还原