Abstract
There are a large number of adjacent buildings in practical engineering application. The structure will collapse and impact the adjacent structures once the weak column is destroyed under seismic action, and, finally, the earthquake damage is aggravated. Material nonlinearity, initial imperfections, and contact problems in the process of collapse-pounding are considered, and the three-dimensional calculation model with unequal 8-story and 6-story height adjacent frames is established. The dynamic response of adjacent structures caused by collapse-pounding is investigated when there is a weak column at different positions in the 8-story frame, and the influence of gap size on the dynamic responses of adjacent structures is discussed. The results show that the impact force is larger when the weak column of the 8-story frame is close to the top of the 6-story frame; pounding increases the interlayer displacement angle of the 8-story frame and decreases the interlayer displacement angle of the 6-story frame in general; the impact force decreases first, then increases, and after that decreases with the increase of gap size; and the interlayer displacement angle distribution of the 6-story frame is significantly affected after the collapse-pounding of the 8-story frame with a weak column. The collapse-pounding problem of adjacent buildings under seismic action is very complex, which should be paid enough attention in engineering design and application.
Highlights
Academic Editor: Luigi Di Sarno ere are a large number of adjacent buildings in practical engineering application. e structure will collapse and impact the adjacent structures once the weak column is destroyed under seismic action, and, the earthquake damage is aggravated
Polycarpou et al [7] performed numerical simulations for the investigation of the effect of the angle of seismic incidence on the response of adjacent buildings, and the results revealed that it was essential to consider the arbitrary direction of the ground motion with respect to the structural axes of the simulated buildings, especially during pounding
Conclusions e 3D calculation models of 8-story and 6-story adjacent frames are established based on LS-DYNA, the collapsepounding dynamic responses under the first failure of columns at different positions in the 8-story frame are studied, and the influence of the collapse position and the gap size of main factors of the system on the dynamic responses is discussed. e main conclusions are as follows: (1) e impact force is small when the weak column is located at the lower floor of the KJ-A, the impact force is significantly greater than that of the lower floor when the weak column is located at the higher level of the KJ-A, and the impact force is larger when the weak column in the KJ-A is near the top of the KJ-B
Summary
Collapse-Pounding Dynamic Responses of Adjacent Frame Structures under Earthquake Action. Initial imperfections, and contact problems in the process of collapse-pounding are considered, and the three-dimensional calculation model with unequal 8-story and 6-story height adjacent frames is established. E dynamic response of adjacent structures caused by collapse-pounding is investigated when there is a weak column at different positions in the 8-story frame, and the influence of gap size on the dynamic responses of adjacent structures is discussed. It is assumed that weak columns exist in different floors of the higher structure, the collapse-pounding dynamic responses of the adjacent structures after the column failure are studied, and the influence of initial collapse position and gap size on dynamic response is discussed. If the projection of the driven node bs on the nearest active chip Si is point M, point M is the contact point of bs in node on the Figure 2
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