Seismic Performance of Cold-Formed Steel Wall Systems in a Full-Scale Building

Summary This paper proposes an experimentally verified procedure to analytically model cold‐formed steel‐framed gypsum nonstructural partition walls considering all the critical components. In this model, the nonlinear behaviors of the connections are represented by hysteretic load‐deformation springs, which have been calibrated using the component‐level experimental data. The studs and tracks are modeled adopting beam elements with their section properties accounting for nonlinear behavior. The gypsum boards are simulated by linear four‐node shell elements. The proposed procedure is implemented to generate the analytical models of three full‐scale partition wall specimens in the OpenSees platform. The specimens were tested as a part of the NEESR‐GC Project on Simulation of the Seismic Performance of Nonstructural Systems. Force‐displacement responses, cumulative dissipated energy, and damage mechanisms from the analytical simulation are compared to the experimental results. The comparison shows that the analytical model accurately predicts the trend of the response as well as the possible damage mechanisms. The procedure proposed here can be adopted in future studies by researchers and also engineers to assess the seismic performance of partition walls with various dimensions and construction details, especially where test data are not available. Copyright © 2015 John Wiley & Sons, Ltd.

Section: Introductionsupporting

confidence: 87%

Analytical model for the in‐plane seismic performance of cold‐formed steel‐framed gypsum partition walls

Rahmanishamsi

Soroushian

Maragakis

2015

“…The considered researches are Restrepo and Berfosky, 4 Retamales et al, 7 Petrone et al, 9 Jeckins et al, 17 and Wang et al 16 In particular, Restrepo and Berfosky performed in-plane quasi-static cyclic tests on lightweight steel drywall partitions, realized following the common United States practice, by means 8 tests on pairs of identical specimens Table 8. The considered researches are Restrepo and Berfosky, 4 Retamales et al, 7 Petrone et al, 9 Jeckins et al, 17 and Wang et al 16 In particular, Restrepo and Berfosky performed in-plane quasi-static cyclic tests on lightweight steel drywall partitions, realized following the common United States practice, by means 8 tests on pairs of identical specimens Table 8.…”

Section: Assessment Of the Seismic Fragilitymentioning

confidence: 99%

In‐plane quasi‐static cyclic tests of nonstructural lightweight steel drywall partitions for seismic performance evaluation

Pali

Macillo

Terracciano

et al. 2018

Summary An experimental program was performed for evaluating the seismic response and fragilities of nonstructural lightweight steel drywall partitions, also considering the interaction with structural elements and other nonstructural building components, ie, outdoor façade walls. Therefore, in‐plane quasi‐static reversed cyclic tests were carried out on 8 specimens of indoor partition walls infilled in a frame and on 4 specimens of indoor partition walls connected at its ends with transversal outdoor façade walls. Constructive parameters under investigation include type of connections used for connecting the indoor partition walls to the surrounding elements, stud spacing, type of sheathing panels, and type of jointing finishing. The effect of the constructive parameters on the lateral response in secant stiffness and strength is examined. Furthermore, the main damage phenomena observed during the tests are reported and associated to 3 damage limit states distinguished for the required repair level for the tested partition walls. Fragility curves are used for the experimental assessment of seismic fragility of the tested specimens, in accordance with the interstorey drift limits required by the European code. Finally, the quantitative estimation of the repair action costs starting from the damage observation is also developed. The obtained results could be considered a starting point for developing the in‐plane seismic design assisted by testing of lightweight steel drywall partition walls.

“…As the seismic demands on the building (superstructure) were relatively low during the base‐isolated test phase (with PIDR <0.4% and PFA <0.3g), the building sustained only minor damage to its nonstructural components (e.g., partition walls ) and very little damage to its structure . During the fixed‐base test phase, the earthquake motions were applied with increasing intensity to progressively damage the structure.…”

Section: Shake Table Test Programmentioning

confidence: 99%

Shake table testing of an elevator system in a full‐scale five‐story building

Wang

Hutchinson

Astroza

et al. 2016

SUMMARY This paper investigates the seismic performance of a functional traction elevator as part of a full-scale five-story building shake table test program. The test building was subjected to a suite of earthquake input motions of increasing intensity, first while the building was isolated at its base, and subsequently while it was fixed to the shake table platen. In addition, low-amplitude white noise base excitation tests were conducted while the elevator system was placed in three different configurations, namely, by varying the vertical location of its cabin and counterweight, to study the acceleration amplifications of the elevator components due to dynamic excitations. During the earthquake tests, detailed observation of the physical damage and operability of the elevator as well as its measured response are reported. Although the cabin and counterweight sustained large accelerations due to impact during these tests, the use of well-restrained guide shoes demonstrated its effectiveness in preventing the cabin and counterweight from derailment during high-intensity earthquake shaking. However, differential displacements induced by the building imposed undesirable distortion of the elevator components and their surrounding support structure, which caused damage and inoperability of the elevator doors. It is recommended that these aspects be explicitly considered in elevator seismic design.