Issue 76

A.Abdulridha et alii, Fracture and Structural Integrity, 76 (2026) 129-153; DOI: 10.3221/IGF-ESIS.76.09

in Fig. 7 (experimental loops Palmer et al (2012) with ETABS results. In general, the peak story shear in ETABS is close to the experimental values in both positive and negative directions (on the order of ±1800–1900 kN), with only a small degree of over ‑ or under ‑ prediction for limited cycles, indicating good calibration of member properties, connection stiffness and strength degradation. Initial stiffness and post-yield slope in the ETABS model overshoot the test data at moderate drifts. However, at very high drifts, the analytical loops are slightly fatter (less degradation), indicating that numerically, it may also be a little conservative in terms of cyclic stiffness and strength reduction. Fig. 8 Full-scale viscous-damped steel moment frame: test setup and experimental vs. full-scale simulation Miyamoto et al. (2010) and ETABS hysteresis loops. The ETABS prediction approximately models the experimental loops in peak force and general shape, indicating that the appropriately calibrated nonlinear viscous damper model is able to capture the global lateral response of the damped frame.

Experimntal

ETABS

-2000 -1500 -1000 -500 0 500 1000 1500 2000

-5-4-3-2-1 0 1 2 3 4 5

Story shear (kN)

Story drift ratio (mm/mm)

Figure 7: Story shear–drift response for the BRBF test specimen hysteresis for both the BRBF specimens, comparing experimental Palmer et al. (2012) with ETABS results.

Experimntal

ETABS

-2000 -1500 -1000 -500 0 500 1000 1500 2000

-100

-50

0

50

100

Force (N)

Displacement (mm)

Figure 8: Force–displacement response for full-scale viscous-damped steel moment frame: experimental setup and comparison of experimental Miyamoto et al. (2010) and ETABS hysteresis loops.

138