针对我国现行规范中剪力墙结构的基本自振周期经验公式是基于高度在50 m以下的建筑实测数据拟合而成的现状，基于脉动法对上海市已建成的总高度在
45~90 m之间的62栋RC剪力墙结构进行了现场动力性能测试，识别了结构在水平纵向与横向的基本自振周期。采用其中60栋结构的数据进行了回归分析，分别给出了基于结构高宽比和“幂次高度系数”的水平纵横两个方向上基本自振周期回归公式；并采用其中2栋结构的测试数据验证了经验公式的准确性。研究表明：结构总高度对RC剪力墙结构的基本自振周期的影响最为显著；采用“幂次高度系数”的经验公式的拟合效果优于基于结构高宽比的经验公式。
Abstract
Here, aiming at the fact of the empirical formula of the fundamental natural vibration period of shear wall structure in the current code of our country being based on measured data of structures with a height of less than 50 m, the onsite dynamic performance tests were conducted for 62 RC shear wall structures with a total height of 45-90 m built in Shanghai based on the pulsation method.Fundamental natural vibration periods of these structures in horizontal- longitudinal and horizontal-lateral directions were identified.Measured data of 60 structures were used to do regression analysis, and the fundamental natural vibration period regression formulas in horizontal-longitudinal and horizontal-lateral directions based on the structure height-width ratio and “power height coefficient” were deduced, respectively.Accuracies of the two empirical formulas were verified with measured data of the rest two structures.The results showed that the total height of RC shear wall structure has the most significant effect on its fundamental basic natural vibration period; the fitting effect of the empirical formula based on “power height coefficient” is better than that based on the structure height-width ratio.
关键词
高层建筑 /
剪力墙结构 /
自振周期 /
脉动测试 /
回归分析
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Key words
high-rise building /
shear wall structure /
natural vibration period /
pulsation testing /
regression analysis
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