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1)  period ratio
周期比
1.
Effective methods of high-rise framework structure period ratio control;
高层框架结构周期比控制的有效方法
2.
In the design of high-rise structure, irregular plane or non-uniform rigidity for anti-lateral displacement will make the displacement ratio and period ratio unable to meet the requirements in specifications.
高层建筑结构设计中常会出现因建筑平面不规则或抗侧移刚度不均匀而引起位移比、周期比不能满足规范要求的情况。
3.
Taking an example of a five-story frame building in the area of 8-degree earthquake,the influence of 1st period ratio and 1st and 2nd main vibration shapes on tortion effect is discussed.
以8度区某5层框架结构为例,探讨第一周期比及第一、二主振型对扭转效应的影响。
2)  torsion-translation period ratio
平扭周期比
3)  coupled period ratio
耦联周期比
1.
The analysis of the influential factors of the structural coupled period ratio
结构耦联周期比影响因素分析
2.
the coupled period ratio), combined with the drift ratio, is incorporated in the specification to exclude tall structures with severe torsional irregularity, and its limits should be satisfied in seismic design.
规程为避免严重扭转不规则结构的出现,除对位移比进行限制外,还限制了扭转为主第一周期与平动为主的第一周期的比值,即高层结构设计应满足平扭耦联周期比的要求。
4)  pulse duration ratio
脉冲周期比
5)  amplitude to period ratio
振幅周期比
6)  period ratio of torsion mode to translation mode
扭转周期比
补充资料:疲劳应力周期比
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性质:设试样在振幅为S1的循环应力作用下,其疲劳寿命为N2…若循环应力S1作用于试样的循环次数为n1(n1<N1);循环应力S2作用于试样的循环次数n2(n2<N2)…则当有时,试样发生疲劳破裂。即称为疲劳应力周期比。它表示振幅为S的循环n次后,使试样疲劳寿命降低的比率。常用这个方法来估计材料在非恒定振幅的循环应力作用下的疲劳寿命。不过误差是较大的。

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