Protocol for testing of cold-formed steel wall in regions of low-moderate seismicity

Abstract

Loading protocols have been developed for quasi-static cyclic testing of structures and components. However, it is uncertain if protocols developed for conditions of intense ground shaking in regions of high seismicity would also be applicable to regions of low-moderate seismicity that are remote from the tectonic plate boundaries. This study presents a methodology for developing a quasi-static cyclic displacement loading protocol for experimental bracing evaluation of cold-formed steel stud shear walls. Simulations presented in the paper were based on conditions of moderate ground shaking (in Australia). The methodologies presented are generic in nature and can be applied to other regions of similar seismicity conditions (which include many parts of China, Korea, India and Malaysia). Numerous response time histories including both linear and nonlinear analyses have been generated for selected earthquake scenarios and site classes. Rain-flow cycle counting method has been used for determining the number of cycles at various ranges of normalized displacement amplitude. It is found that the number of displacement cycles of the loading protocol increases with increasing intensity of ground shaking (associated with a longer return period).

Seismic response prediction of FRC rectangular columns using intelligent fuzzy-based hybrid metaheuristic techniques

“…Concrete is often considered as the most widely used construction material in the world (Rasekh et al 2020 ; Jahandari et al 2019 , 2020 ; Saberian et al 2017 ; Mohammadi et al 2019a , b ). Fibres application in concrete can decline the requirement of transverse reinforcement in fiber-reinforced concrete (FRC) members, particularly in their seismic design (Khorami et al 2017 ; Bossio et al 2017 ; Park et al 2016 ; Ghassemieh and Bahadori 2015 ; Shahi et al 2013 ; Jalali et al 2012 ; McMullin et al 1993 ; Bahrololoumi and Dargazany 2019 ; Mohammadi et al 2019a , b ). Fibers play an important role in some critical members which require many reinforcements such as beam to column joints (Kazemi et al 2020a , b ; Afshar et al 2020 ; Sadeghian et al 2020 ).…”

“…Employing these techniques for prediction, describing runoff volume, debris volume, and sediment texture as input for algorithms could give the sediment load in place of output (Shahi et al 2013 ; Jalali et al 2012 ; McMullin et al 1993 ). Back propagation (BP) approaches, which are placed among classic techniques, have been generally proposed to train artificial neural networks (ANN) (McCulloch and Pitts 1943 ).…”

Seismic Performance Behavior of Cold-Formed Steel Wall Panels by Quasi-static Tests and Incremental Dynamic Analyses

“…Information so obtained from the monotonic, and cyclic, tests was then used as input into non-linear time-history analyses. The loading protocol adopted in the cyclic tests had been developed by Shahi et al [2013] to simulate conditions of moderate ground shaking in regions of low and moderate seismicity. Incremental dynamic analyses were then applied to equivalent single-degree-of-freedom (SDOF) systems which were representative of the dynamic behaviour of the wall panels.…”

“…FIGURE 2Loading protocol modified from recommendations byShahi et al [2013] Downloaded by[59.167.184.153] at 20:40 12 May 2016…”