地震作用下低层建筑砌体结构的动力特性分析

Dynamic Characteristics of Masonry Structure of Low-rise Buildings under Earthquakes

摘要:

传统低层建筑砌体结构动力特性分析中，易受到外界环境的干扰，砌体结构的完整性欠缺，导致动力特性分析的准确度较低。为提高低层建筑砌体结构的抗震性能，提出地震作用下低层建筑砌体结构的动力特性分析方法。首先利用低层建筑砌体结构反应自功率谱，完成砌体结构的自振频率辨认；然后通过941B型超低频率测振仪测试自振频率，筛出振动波形中噪声干扰的区域，获取时域波形和频域波形；最后依据时域波形和频域波形塑造低层建筑砌体三维精细化模型，在该模型基础上，通过子空间迭代算法获取低层建筑砌体结构的模拟结果，分析地震作用下芯柱、圈梁等构造措施对建筑砌体结构动力特征的影响，完成砌体结构的动力特性分析。实验结果表明，利用所提方法对地震作用下低层建筑砌体结构的动力特性进行分析，得到的分析结果准确度较高。

Abstract:

The traditional methods of analyzing the dynamic characteristics of masonry structure in low-rise buildings are easily disturbed by the external environment, and masonry structures have poor structural integrity, which leads to low accuracy of dynamic characteristics analyses. To improve the seismic performance of masonry structures in low-rise buildings, a method for dynamic analysis of masonry structure in low-rise buildings under earthquake is proposed in the study. First, the natural frequency of the masonry structure is identified using the auto-power spectrum of the masonry structure of low-rise buildings. Then the natural frequency is tested by a 941 B ultra-low frequency vibrometer, and the area of noise interference in the vibration waveform can be selected to obtain the time domain and frequency domain waveforms. Finally, a 3D refined model of masonry structure is established according to the time domain and frequency domain waveforms. Based on the model, the simulation results of low story masonry structure are obtained by a subspace iteration algorithm, and the influences of core column, ring beam, and other structural measures on the dynamic characteristics of masonry structure under earthquakes are analyzed. The experimental results show that the proposed method analyzes the dynamic characteristics of masonry structure in low-rise buildings under earthquakes more accurately than traditional methods.