Abstract
In order to estimate the inelastic interstorey drift of cold-formed steel (CFS) framed structures under collapse level earthquakes, the deflection amplification factor ηp is employed in this paper to compute the maximum interstorey drift ratio (IDRmax) from an elastic analysis. For this purpose, a series of CFS wall specimens were tested under cyclic horizontal loads, and then the hysteresis model of the walls was put forward by test results. In terms of the hysteresis model, a large quantity of elastic-plastic time-history analysis of CFS building structures was conducted based on the storey shear-type model. Furthermore, the deflection amplification factor ηp for estimating IDRmax and the parameters were analyzed. The results indicate that the deflection amplification factor ηp is highly dependent on yielding coefficient of storey shear force ξy, storey number N, period of structure T, and ground acceleration records GA. Eventually, an approximate ξy-N-ηp relationship for estimating the deflection amplification factor ηp is proposed in this paper, which can be used for seismic design in practices.
Highlights
In past decades, cold-formed steel (CFS) framed buildings have gained popularity in North America, Europe, Australia, and Japan
Typical hysteretic responses of CFS shear walls are presented in Figure 5. e response of pinching and no-load slipping is clearly obvious owing to the failure mechanism of screw connections, which dominates the nonlinear manner
Due to the huge amount of analysis data, the selected curves of ξy vs. ηp are presented in Figure 12. e results show that deflection amplification factor ηp gradually increases with the decreasing yielding coefficient ξy. is rule is confirmed by the analysis models with different storey number N and different Ground Acceleration Records (GA) in Section 5 of this paper
Summary
Cold-formed steel (CFS) framed buildings have gained popularity in North America, Europe, Australia, and Japan. In China, cold-formed steel has historically been used for nonstructural members (e.g., curtain walls and partition walls) or secondary structural systems (e.g., purlins and girts), but recently it has begun to be used as the primary structural members in buildings. Due to their lightweight, environmental friend, low cost, and easy installation, the Chinese government actively promotes CFS framed buildings. Seismic performance-based design for CFS buildings has remained out of reach
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