دانلود رایگان مقاله انگلیسی مقاومت برشی دیوارهای برشی موجدار فولاد سخت - الزویر 2018

ABSTRACT

In recent years, the steel corrugated shear walls (SCSWs) are widely used in building structures to serve as lateral force resistant members. For some practical engineering applications that the width of the infilled SCSWs in frame structure is much greater than its height, it is common to add vertical stiffening systems to the SCSWs, thus forming the stiffened SCSWs (SSCSWs), and the stiffening system is composed of a pair of vertical stiffeners installed on both sides of the corrugated plate and the connecting high-strength bolts. In this paper, the shear resistant behavior of the SSCSWs is investigated via FE analyses considering both the geometrical and material nonlinearities, and over 300 models are analyzed through elastoplastic numerical process. The comparison of the shear resistant behavior of SSCSWs with different stiffening rigidities is performed, which indicates that the stiffening system can effectively restrain the out-of-plane displacements of the corrugated wall, and can improve both shear resistance and ductility of the SSCSWs. Then a transition rigidity ratio of the stiffening system is proposed to reflect the critical value of the stiffening rigidity that the out-of-plane displacements of the corrugated plate are fully restrained at the bolted locations. Correspondingly, curve fitted formula of the transition rigidity ratio is provided to enable a conservative prediction. Finally, shear buckling formulas are fitted to reveal the relationship between the reduction factor and the normalized aspect ratio, and they are validated to be able to conservatively predict the ultimate shear stress of SSCSWs. Accordingly, some design recommendations are presented, which could provide valuable references for practical design of SSCSWs.

5. Conclusion

In this paper, shear resistant behavior of stiffened steel corrugated shear walls (SSCSWs) is investigated via FE analyses considering both the geometrical and material nonlinearities, and the following conclusions can be drawn:

(1) The shear resistant behavior of SSCSWs with different stiffening rigidities are compared, which indicates that the stiffening system can effectively restrain the out-of-plane displacements of the corrugated wall, and can improve both shear resistance and ductility of the SSCSWs. Yet in this paper, due to lack of detailed design criterion of stiffeners, it is not guaranteed that the failure of stiffeners occurs before the failure of corrugated plate. This aspect is of significance for a comprehensive design of the SSCSWs and needs further investigation.

(2) For the SSCSWs with a parameter range of 0.08 0.1 < < θ 6, their transition rigidity ratio is defined and calculated based on FE results, and corresponding fitting formula is provided to conservatively predict the transition rigidity ratio values under elastoplastic analyses. Different from the constant transition rigidity ratio for elastic buckling situation, the provided transition rigidity ratio values under elastoplastic analyses distribute in a quite wide range.

(3) For the SSCSWs with a parameter range of 0.08 0.1 < < θ 6, two types of shear buckling formulas are fitted, and they are validated to be able to conservatively predict the ultimate shear stress of SSCSWs with η ≤ η0,p and η > η0,p respectively. Accordingly, some design recommendations are provided for practical design of SSCSWs.