دانلود رایگان مقاله انگلیسی عملکرد لرزه ای یک ساختار دیوار برشی ورقه فولادی نازک تعمیر شده - الزویر 2018

abstract

A multi-ribbed grid of channels can effectively restrain the deformation of an embedded steel plate shear wall, improving the elastic stiffness of the overall structure while enhancing its energy dissipation capacity. Aonebay, two-story specimen was tested under low cycle reversed loading in two stages. After being damaged in Stage I, the structure was repaired by anchoring the multi-ribbed channel grid. The structure was then loaded to destruction. To investigate the changes in performance of the structure due to reinforcement, comparison and analysis of the structure were conducted for the two stages. The results indicate that in the elastic stage, when the repaired structure is in its normal service state, the deformation of the steel plate is effectively restrained, and the elastic stiffness and energy dissipation capacity is improved. In the elastic-plastic stage, the failure mode of the structure is reasonable, and the hysteresis loop is full as the multi-ribbed channel grid effectively restrains the pinching phenomenon. Based on the results of the experiment, finite element models were established. According to the finite element analysis, the yield load, initial stiffness, and maximum lateral force bearing capacity of the repaired structure improved significantly.

Conclusions

In this research, a multi-ribbed channel grid was used to repair a damaged steel frame-thin steel plate shear wall structure. The behavior of the structure after repair was studied by experimental analysis. Based on the results of the experiment, finite element models were established. Finally, the behavior of the repaired and damaged structure was studied. The conclusions of this research are as follows:

(1) The proposed method of anchoring a multi-ribbed channel grid to repair a thin steel plate shear wall structure can effectively reinforce the embedded steel plate and weaken the tension field effect.

(2) The failure mode of the post-repair structure is reasonable. The reinforced steel plate cooperated well with the partially yielded steel frame. The damaged steel frame beam ends and column bases were not destroyed prior to the reinforced embedded steel plate. Each panel of the embedded steel plate effectively resisted the lateral load and protected the steel frame. According to the FE analysis, the stress of the steel frame of the post-repair structure is smaller than that of the not repaired one at the drift ratio of 1/50.

(3) The multi-ribbed channel grid effectively restrains the outplane deformation of the embedded steel plate and improves the energy dissipation capacity of the structure. The elastic stiffness of the post-repair structure is higher than that of the original structure. The hysteresis curve of the specimen is plump, and the redistribution of internal force is good. The average value of the damping coefficient ζ in the elastoplastic stage is 0.15.

(4) According to the finite element analysis, the yield load, initial stiffness, and maximum lateral force bearing capacity of the repaired structure improved significantly compared to those of the damaged structure. The multi-ribbed grids effectively reduced the out-plane deformation of the embedded steel plate, and reduced the additional bending moment of the frame. The repaired structure exhibited considerably better performance.