Seismic performance analysis of braced steel structures based on vibration experiments and finite element simulation.

In Fig 8(b) , the DR of the structure corresponding to working conditions 1–7 under different excitation accelerations shows an increasing trend, indicating that the structure’s own stiffness is significantly affected by the seismic action.

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The NFs corresponding to working conditions 1–4 generally show a decreasing trend, but the decreasing magnitude is small, and the maximum decreasing magnitude is only 1.17%.

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