摘要
提出了2种计算体外预应力简支梁动力性能的方法：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；方法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。
Abstract
Two numerical methods for analyzing dynamic behavior of externally prestressed beam are put forward: between external tendon and deviator, slip without no friction is assumed in method ①, and is simulated by contact element; hinge without slip is assumed in method ②. The calculation results of method ① show: the increment of area and eccentricity of external tendon increase the frequency of the first order; influence little the frequencies of other odd order, don’t influence the frequencies of even order. The frequency of every order by method ② is greater than the one by method ①. With increasing area and eccentricity of external tendon, the frequency of every order by method ② increases; the ratio of frequency difference between method ① and ② also increases. The influence of slip between external tendon and deviator to the frequency of the first order can be neglected, but this influence to the frequency of other order can not be neglected.
关键词
简支梁 /
体外预应力 /
自振频率 /
滑移 /
动力分析
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Key words
Simple beam /
external prestress /
natural frequency /
slip /
dynamic analysis
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方德平.
体外预应力梁动力特性的两种数值分析方法[J]. 振动与冲击, 2012, 31(24): 168-171
Fang Deping.
Two numerical methods for analyzing dynamic behavior of externally prestressed beam[J]. Journal of Vibration and Shock, 2012, 31(24): 168-171
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脚注
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