Influence of infill configurations on seismic responses of steel self‐centering moment resisting frames

Abstract

Summary Steel self‐centering moment resisting frames (SC‐MRFs) have been validated experimentally as resilient structural systems, mainly highlighting the minimized residual drift responses but are prone to suffering high‐mode effects. In this paper, the influence of infill configurations on seismic responses of steel SC‐MRFs was first analyzed. A comparison of the previous experimental results was conducted to investigate the effect of infills on the residual drift of steel frames. In the numerical simulation, the infills were modeled as the equivalent strut diagonals, and the force–displacement of the infills was modeled using the combination of Elastic‐No Tension Material and Hysteretic Material offered by the OpenSees program. The seismic analyses of 3‐ and 9‐story SC‐MRFs with and without infills were carried out to analyze the effects of infills on the residual drift responses and high‐mode contribution under the selected ground motions. Finally, the different infill types and infill irregularities on the seismic responses were investigated to obtain general conclusions. The plastic deformations of columns and infills are also compared in the different cases of infill configurations. The results reveal that all infilled cases experience reduced peak‐story drift and force demands at the upper stories.

Investigation of the seismic behaviour of masonry infilled self-centring beam moment frames using a new infill material model

“…These parameters could have different values. Other researchers (Celarec et al 2012;Martinelli et al 2015;Jeon et al 2015;Mohammad et al 2016;Landi et al 2016;Noh et al 2017;Huang et al 2018aHuang et al , 2018bSkoulidou et al 2019aSkoulidou et al , 2019b adopted the uniaxial material models available in the OpenSees software to model the hysteretic response of infill walls. The strength of the Hysteretic material in a positive direction was input as the minimum value to represent the negligible tensile strength of the infill walls to bounding frames.…”

“…The tensile frame-infill interaction affected the numerical accuracy when the loading was reversed in the positive direction. Huang et al (2018b) proposed a series of materials that included the Hysteretic material and Elastic-no tension (ENT) material to model the compression-only behaviours of infill walls, in which the reloading branch occurred only when the strut was loaded to the maximum unloading point in history. The reloading stiffness and strength of infill walls deteriorate with increases in the amplitude and number of cycles after the elastic branch is exceeded.…”

“…The backbone parameters can be input based on the force-displacement relationship developed by Panagiotakos and Fardis (1994). The envelope model has shown good accuracy and been widely adopted in previous predictions (Celarec et al 2012;Jeon et al 2015;Mohammad et al 2016;Huang et al 2018b). The hysteretic is determined by five parameters.…”

“…FEMA356 (2000), Al-Chaar (2002), Mostafaei and Kabeyasawa (2004) and Liberatore et al (2018) developed different force-displacement envelope models for the equivalent strut, but did not define the unloading and reloading branches. Recently, many researchers (Celarec et al 2012;Martinelli et al 2015;Jeon et al 2015;Mohammad et al 2016;Landi et al 2016;Noh et al 2017;Huang et al 2018aHuang et al , 2018bSkoulidou et al 2019aSkoulidou et al , 2019b have simulated the behaviour of infill walls with the help of some existing materials available in the OpenSees software, such as the Hysteretic and Concrete01 materials. Most of these approaches could capture the backbone curves of infill walls, but failed to accurately account for the hysteretic responses of the infill walls under cyclic loading.…”

Investigation of the seismic resilience of reinforced concrete special moment frames with infills

“…On the other hand, in recent years, different aspects of the role of masonry infills on RC moment frames have been investigated such as the effects on seismic behavior, seismic response, damages and reduction in collapse safety under seismic sequences. [17][18][19][20][21] But the effect of masonry infills on seismic resilience of RC moment frames with special ductility is not investigated. Therefore, in this study, the overall framework of calculating structural resilience presented in HAZUS 22 is implemented on RC moment resisting frames with special ductility using economic and engineering parameters in Iran.…”