دانلود رایگان مقاله انگلیسی ارزیابی عملکرد لرزه ای ساختار قاب دیوار سنگی چیده شده با تست شبه استاتیک چرخان - اشپرینگر 2018

Abstract:

Earthquake investigations have illustrated that even code-compliant reinforced concrete frames may suffer from soft-story mechanism. This damage mode results in poor ductility and limited energy dissipation. Continuous components offer alternatives that may avoid such failures. A novel infi lled rocking wall frame system is proposed that takes advantage of continuous component and rocking characteristics. Previous studies have investigated similar systems that combine a reinforced concrete frame and a wall with rocking behavior used. However, a large-scale experimental study of a reinforced concrete frame combined with a rocking wall has not been reported. In this study, a seismic performance evaluation of the newly proposed infi lled rocking wall frame structure was conducted through quasi-static cyclic testing. Critical joints were designed and verifi ed. Numerical models were established and calibrated to estimate frame shear forces. The results evaluation demonstrate that an infi lled rocking wall frame can effectively avoid soft-story mechanisms. Capacity and initial stiffness are greatly improved and self-centering behavior is achieved with the help of the infi lled rocking wall. Drift distribution becomes more uniform with height. Concrete cracks and damage occurs in desired areas. The infi lled rocking wall frame offers a promising approach to achieving seismic resilience.

6 Conclusions This paper proposes a novel structure system, an infi lled rocking wall frame structure, in which the rocking wall behaves as a continuous component. In the system, rocking walls are embedded in a frame, which facilitates wall construction and avoids complexity in frame-wall connection. The seismic performance of the proposed system was investigated through a quasi-static cyclic test. For comparison, a reinforced concrete frame (RCF) model and an infi lled rocking wall frame (IRWF) model were designed faithfully following Chinese seismic design codes. The contributions of slabs, outof-plane beams, and footing beams were considered. Comparisons on capacity, stiffness, displacement, crack width, strain and damage mode were made. Critical joints were designed and verifi ed. Finite element models were built and calibrated, and column shear forces in the IRWF model were achieved and compared. The main conclusions are as follows.

(1) Capacity and initial stiffness are evidently improved in the IRWF model, with capacity at more than 2 times and initial stiffness at 2.7 times that of the RCF model. The IRWF model also demonstrated satisfactory self-centering ability and negligible residual drift.

(2) The rocking wall has promising control on displacement distribution. Inter-story drift remained uniform along the height. When the structural drift ratio was 1/50, drift was 39.3, 35.7 and 34.7 mm for the three stories, respectively.