爆破振动作用下单层砖混房屋结构的动态响应

以单层砖混房屋为研究对象，应用有限元软件ANSYS建立了单层砖混房屋的数值模型。将实测地震波输入模型，分析了地震波引起的房屋结构的位移特征。根据小波包原理分析了实测房屋框架柱频域能量，构造了3种谐波加载到房屋模型，研究不同频域下房屋结构的速度响应。计算结果表明，单层砖混房屋的底部与顶部位移较大，门窗附近位移较为明显，框架柱顶端位移最大。实测发现，地基和建筑各结构能量大部分集中在7.81~37.50 Hz。构造了5、10、25 Hz 3种频率的地震波,加载到模型后发现,在高频爆破振动下，单层砖混房屋后山墙较前山墙受爆破振动影响较大;门窗与框架柱之间容易产生超越安全允许振速的情况；分析了后山墙左侧窗上带测点的频域分布，发现频带能量主要分布在0～15.63 Hz区间。

Dynamic Response of Single-layer Masonry-concrete Building under Blasting Vibration

A numerical model of single-layer masonry-concrete houses was established by using the finite element software ANSYS. The observed seismic wave was input into the model to analyze displacement characteristics of the structure caused by the seismic wave. According to the principle of wavelet packet, the measured frequency domain energy of frame column was analyzed, and three kinds of harmonic loads were constructed to study the speed response of the building structure in different frequency domain. Results show that the displacement of the bottom and the top of the single-layer masonry-concrete house is larger, the displacement near the doors and windows is obvious, and the displacement at the top of the frame column is the largest. It is found that the energy of foundation and building structures is concentrated in 7.81-37.50 Hz. Seismic waves of 5, 10, 25 Hz were constructed. After loading into the model, it is found that under the high frequency blasting vibration, the rear gable of single-layer masonry-concrete house is more affected by the blasting vibration than the front gable. It is easy to exceed the safety allowable vibration speed between doors and windows and frame columns. The frequency domain distribution of measurement points on the window on the left window of the rear gable was analyzed, and it is found that the frequency band energy mainly distributed in the range of 0-15.63 Hz.