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Derivation of energy-based base shear force coefficient considering hysteretic behavior and P-delta effects

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Abstract

A modified energy-balance equation accounting for P-delta effects and hysteretic behavior of reinforced concrete members is derived. Reduced hysteretic properties of structural components due to combined stiffness and strength degradation and pinching effects, and hysteretic damping are taken into account in a simple manner by utilizing plastic energy and seismic input energy modification factors. Having a pre-selected yield mechanism, energy balance of structure in inelastic range is considered. P-delta effects are included in derived equation by adding the external work of gravity loads to the work of equivalent inertia forces and equating the total external work to the modified plastic energy. Earthquake energy input to multi degree of freedom (MDOF) system is approximated by using the modal energy-decomposition. Energy-based base shear coefficients are verified by means of both pushover analysis and nonlinear time history (NLTH) analysis of several RC frames having different number of stories. NLTH analyses of frames are performed by using the time histories of ten scaled ground motions compatible with elastic design acceleration spectrum and fulfilling duration/amplitude related requirements of Turkish Seismic Design Code. The observed correlation between energy-based base shear force coefficients and the average base shear force coefficients of NLTH analyses provides a reasonable confidence in estimation of nonlinear base shear force capacity of frames by using the derived equation.

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Authors and Affiliations

  1. Department of Architecture, Dokuz Eylul University, Izmir, Turkey

    Taner Ucar

  2. Department of Civil Engineering, Dokuz Eylul University, Izmir, Turkey

    Onur Merter

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  1. Taner Ucar
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  2. Onur Merter
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Correspondence to Taner Ucar.

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Ucar, T., Merter, O. Derivation of energy-based base shear force coefficient considering hysteretic behavior and P-delta effects. Earthq. Eng. Eng. Vib. 17, 149–163 (2018). https://doi.org/10.1007/s11803-018-0431-3

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  • DOI: https://doi.org/10.1007/s11803-018-0431-3

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