Dynamic Response Characteristics and Safety Evaluation of Frame Structure Under Blasting Impact
It is important to the safety and stability of the adjacent building structures in the blasting construction of urban underground projects.Based on the Wuhan Metro Line 8 Phase II liaison chan-nel blasting excavation project,the dynamic response characteristics of the adjacent 6-story brick structure under the action of the connecting passage blasting excavation were analyzed using a combi-nation of on-site monitoring and LS-DYNA 3D finite element numerical simulation to evaluate its safe-ty.The study shows that the peak vibration velocity and frequency characteristics of the numerical cal-culation model are consistent with the field measured data,and the numerical calculation model and parameters are reasonably selected;the vibration response of the masonry structure is dominated by the vibration in the height direction,and the maximum vibration points appear in the foot and top of the column at the location closer to the blast source;the dynamic stress shows a trend of increasing and then decreasing in the length direction,and the oscillation decreases along the width direction trend,the location of the effective stress for the location near the source of the blast;structure vibra-tion speed and effective stress have a corresponding relationship,according to the ultimate tensile strength of the masonry structure is 1.18 cm/s calculated as a safe control vibration speed,the struc-ture is in a safe state.
万方数据
维普
