Control measures of collapse-pounding dynamic responses of adjacent structures under earthquake action

Abstract

The adjacent structures are easy to impact under earthquake, and the huge impact force will destroy the structural members, such as beams and columns, and even cause partial or total structural collapse. In order to control the pounding and the collapse of the adjacent structures, the flexible control measures with steel strands is proposed, which has little influence on the dynamic characteristics of the structure itself. The 3-D calculation model of the adjacent 10-storey and 8-storey frame structures are established by explicit dynamic program. The influence of steel strand arrangements on pounding and collapse is studied, and the parameter analysis is conducted. The results show that the uncontrolled adjacent structures are prone to collapse under strong earthquake, and the reasonable control measures can avoid structure collapse when the PGA is 0.62g. The maximum reduction rate of the impact force is 38.28%, the maximum reduction rates of the inter storey displacement angles of the taller and the lower structures are 16.36% and 24.74%, respectively. The lower structure is more affected by the pounding compared with the taller structure. The impact force does not always decrease with the increase of the gap size, and the earthquake intensity is one of the factors affecting the change law. The height difference of adjacent structures has great influence on the impact force and vertical displacement. The structure damage is aggravated with the increase of seismic dimension. The reasonably designed flexible measures are very effective for controlling the pounding and collapse of the adjacent structures under earthquake.