【摘要】 提出2种计算体外预应力简支梁动力性能的方法:①假设体外筋与转向座之间可自由滑移,由接触单元进行模拟;②假设转向座与体外筋之间铰接无滑移。方法①的计算结果表明:体外筋面积和偏心距的增加,可增加第1阶频率;对其他奇数阶的频率影响很小;对偶数阶频率无影响。方法②的计算所得的各阶频率均大于方法①的频率。随着体外筋的面积和偏心距的增加,方法②的各阶频率均增大,方法①和②所得频率差值的比值也增大。体外筋与转向座滑移对第1阶频率的影响可忽略,对其他阶频率的影响不可忽略。更多还原

【Abstract】 Two numerical methods for analyzing dynamic behavior of an externally prestressed beam were put forward.That there is a slip with no friction between external tendon and deviator was assumed using method 1,the slip was simulated with contact elements.That there is a hinge with no slip between external tendon and deviator was assumed using method 2.The calculation results with method 1 showed that with increase in area and eccentricity of external tendon,the 1st natural frequency of the beam increases;but thes two factors have little influence on the other odd order natural frequencies of the beam;they have no effect on the even order natural ones of the beam.It was shown that each natural frequency obtained with method 2 is larger than that obtained with method 1;with increase in area and eccentricity of external tendon,each natural frequency gained with method 2 increases;the ratio of the corresponding frequency difference between method 1 and method 2 to the frequency gained with method 1 also grows;the influence of slip between external tendon and deviator on the 1st natural frequency can be neglected,but this influence on the other order frequencies can not be neglected.更多还原