地震研究

对建筑结构地震反应观测台阵在结构抗震设计中的意义进行了简要论述,介绍了大理经济技术开发区管理委员会框架剪力墙大楼内的地震观测台阵测点布设,概述了该台阵在2021年云南漾濞MS6.4地震中获取的强震记录情况,并从峰值加速度和频谱等方面对主震及5.0级以上地震的观测记录进行了分析。结果表明:水平和竖向峰值加速度随着楼层的增加均存在放大现象,震级越大,楼层的水平振动放大效果越明显; 该结构的第一振型和第二振型的自振频率分别为0.48 Hz和1.86 Hz。

In this paper,the significance of the structural seismic response array for the earthquake-resistant design of structure is briefly discussed,and the layout of the measuring points of the structural seismic response array in the building of the Management Committee of Dali Economic and Technological Development Zone is introduced.In addition,the strong-motion records obtained in the MS6.4 Yangbi earthquake event on May 21,2021 is summarized.The peak ground acceleration and the frequency spectrum of the strong motion records of the main shock and the MS≥5.0 after shocks are processed and analysed.The results show that the motions are amplified both in the horizontal and the vertical direction with the ascending of the building's floor.And as the magnitude increases,the amplification of the motions is more obvious.Meanwhile the natural frequency of the first vibration mode and the second vibration mode is respectively 0.48 Hz and 1.86 Hz.

引言
1 建筑结构特征
2 结构地震反应观测台阵布设
3 观测数据分析
4 结论

图1 大理市结构地震反应观测台阵近场历史地震分布<br/>Fig.1 Historical-earthquake distribution around the structural seismic response array in Dali City

图1 大理市结构地震反应观测台阵近场历史地震分布
Fig.1 Historical-earthquake distribution around the structural seismic response array in Dali City

图2 大理经开区管委会大楼外观<br/>Fig.2 Architectural appearance of the building of the Management Committee of Dali Economic and Technological Development Zone

图2 大理经开区管委会大楼外观
Fig.2 Architectural appearance of the building of the Management Committee of Dali Economic and Technological Development Zone

图3 大楼平面布局和测点位置分布<br/>Fig.3 The plane of the building and location of measuring points

图3 大楼平面布局和测点位置分布
Fig.3 The plane of the building and location of measuring points

图4 传感器位置示意图<br/>Fig.4 The layout of the sensors

图4 传感器位置示意图
Fig.4 The layout of the sensors

表1 台阵获取的漾濞地震序列加速度记录<br/>Tab.1 The acceleration recordings of the Yangbi earthquake sequence by the array

表1 台阵获取的漾濞地震序列加速度记录
Tab.1 The acceleration recordings of the Yangbi earthquake sequence by the array

表2 漾濞地震序列5.0级以上地震记录的各楼层峰值加速度<br/>Tab.2 The peak ground accelerations of the MS≥5.0 earthquakes of Yangbi earthquake sequence(单位:cm/s2)

表2 漾濞地震序列5.0级以上地震记录的各楼层峰值加速度
Tab.2 The peak ground accelerations of the MS≥5.0 earthquakes of Yangbi earthquake sequence(单位:cm/s2)

图5 漾濞MS6.4主震的长轴向(a)、短轴向(b)加速度时程曲线<br/>Fig.5 The time history of acceleration of the Yangbi MS6.4 earthquake in major axis(a) and minor axis(b)of the structure

图5 漾濞MS6.4主震的长轴向(a)、短轴向(b)加速度时程曲线
Fig.5 The time history of acceleration of the Yangbi MS6.4 earthquake in major axis(a) and minor axis(b)of the structure

图6 各楼层强震动记录的5.0级以上地震的峰值加速度<br/>Fig.6 PGA of strong motion recondings of M>5.0 earthquakes on each floor of the building

图6 各楼层强震动记录的5.0级以上地震的峰值加速度
Fig.6 PGA of strong motion recondings of M>5.0 earthquakes on each floor of the building

图7 漾濞MS6.4主震长轴向(a)和短轴向(b)傅立叶幅值谱<br/>Fig.7 Fourier spectrum in major axis(a)and minor axis(b)direction

图7 漾濞MS6.4主震长轴向(a)和短轴向(b)傅立叶幅值谱
Fig.7 Fourier spectrum in major axis(a)and minor axis(b)direction

图8 墙面水平向和竖向裂缝(a)及地面瓷砖开裂(b)<br/>Fig.8 The horizontal and vertical cracks on the wall(a)and cracking of ceramic tile on the floor(b)

图8 墙面水平向和竖向裂缝(a)及地面瓷砖开裂(b)
Fig.8 The horizontal and vertical cracks on the wall(a)and cracking of ceramic tile on the floor(b)

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备注

引言

1 建筑结构特征

2 结构地震反应观测台阵布设

3 观测数据分析

4 结论

期刊信息