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。
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 1th natural frequency can be neglected, but this influence on the other order frequencies can not be neglected.
出处
《振动与冲击》
EI
CSCD
北大核心
2012年第24期168-171,共4页
Journal of Vibration and Shock
关键词
简支梁
体外预应力
自振频率
滑移
动力分析
simply supported beam
external prestress
natural frequency
slip
dynamic analysis
