Study On Vibration Response Law Of Single-storey Brick-concrete Structure House Under Blasting Earthquake

With the rapid development of economy and increasing engineering demand,blasting is more widely used in mines and other fields,but the negative effects are difficult to eliminate.This is the key and difficult point in the field of blasting seismic research,including the single layer that is common in current mining areas.There are few studies on the mechanism and laws of blasting seismic response of brick-concrete structures.The vibration monitoring of a single-story brick-concrete house on the north side of an iron mine open pit in Tangshan showed that the vibration intensity was less than the safety allowable value,and the dynamic response of the structure was most obvious when the main frequency ratio is 1.The measured PPV(peak vibration velocity)showed that the difference between the three points of PPV along the window was significant;the rear gable presented two singularities at the two corners of the window along the four points of the frame;the front gable increaseed linearly at three points along the frame column.The four-point horizontal radial vibration velocity signal of the house and the ground was scaled and reconstructed.It was found that the signal energy in the frequency domain increased and decreased with the energy ratio of each band at 23.44 Hz as the height of the structural point increased.The Hilbert-Huang Transform was used to decompose the vibration velocity signal to obtain the multi-order vibration modes of the two measurement points,and the natural frequencies were identified according to the spectrum of each component.Simplify the building attachment to obtain the geometric model and construct the finite element structure model,construct 5,10,25,50 Hz,the vibration speed of 1.5cm / s harmonics,the structural model for 2s continuous measured wave,and the continuous half-wavelength harmonic The three-way loading of the wave analyzes the vibration velocity,displacement,stress distribution and time-course response characteristics of the single-story brick-concrete house under different loadings.Combined with the measured structural response law,it was proposed that the window corner and the window on the house will be damaged first.Figure77;Table11;Reference102...