Influences of Bidirectional Seismic Excitations and P-<I>&#</I>61508; Effect on Ductility Demand

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (21) : 54-61.

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Influences of Bidirectional Seismic Excitations and P- Effect on Ductility Demand

YU Bo 1 HONG HanPing 2 YANG LuFeng 1

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Abstract

A new biaxial Bouc-Wen model for seismic dynamic analysis of inelastic two-degree-of-freedom (2DOF) system under bidirectional horizontal excitations was developed by adopting the normalized displacement as governing parameter and taking the P-effect, strength deterioration, stiffness degradation and strain hardening into account. In this model, the circular yield surface is used to describe coupling effect between orthogonal normalized restoring forces. The influences of bidirectional excitations and P-effect on statistical characteristics of seismic ductility demand of inelastic 2DOF system were quantitatively investigated using 69 earthquake records. Analysis results show that bidirectional excitations and P-effect can significantly affect seismic ductility demand of inelastic 2DOF system depending on structural parameters. The seismic ductility demand of systems with short period can be described as either the Lognormal or the Frechet distribution variable, while the Frechet distribution is preferred for systems with long period. The seismic ductility demand of inelastic 2DOF system under bidirectional excitations can be approximated by the square root of sum of square (SRSS) of seismic ductility demands of single-degree-of-freedom (SDOF) system under unidirectional excitation.

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bidirectional excitations / P- /  / effect / ductility demand / biaxial Bouc-Wen model

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YU Bo HONG HanPing YANG LuFeng . Influences of Bidirectional Seismic Excitations and P- Effect on Ductility Demand[J]. Journal of Vibration and Shock, 2012, 31(21): 54-61