عملکرد لرزه ای یک ساختار دیوار برشی ورقه فولادی
Abstract
1- Introduction
2- Experiment details
3- Experiment results
4- Numerical simulation
5- Conclusions
References
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. Aone-bay, 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.
Introduction
The reinforcement of damaged structures represents a remarkable interest topic in the field of Seismic Engineering [1,2]. The steel plate shear wall structure is mainly composed of steel frames and embedded steel plates. The steel frame bears the vertical load while the embedded steel plate bears most of the horizontal load [3–4]. According to the “strong frame, weak wallboard” design concept, the embedded steel plate yields firstly and the frame yields secondly under an earthquake. [5–6]. This disaster prevention design concept makes the steel plate shear wall a repairable structure [7]. To determine the performance characteristics of a repaired steel plate shear wall, Qu etal. conducted a two-stagepseudo-dynamic test on a full-scaletwo-story steel plate shear wall specimen [8]. Between the two stages of the test, the damaged steel plate shear wall structure was repaired by replacing the embedded steel plates. The test results indicated that the repaired structure behaved similarly to the original one, demonstrating that it is feasible to repair damaged post-earthquake shear wall structures by replacing the embedded steel plates. However, significant labor is required to replace the embedded steel plates in practical applications. Therefore, it remains necessary to develop an easier repair method. To address the difficulties of repairing or replacing embedded steel plate shear walls, the anchoring of a multi-ribbed channel grid to the shear wall to repair a damaged steel plate shear wall is proposed in this paper.