Abstract
Existing old reinforced concrete (RC) buildings could be vulnerable to large earthquake events. Most columns in such buildings have insufficient reinforcement details, which may experience failure during an early loading stage. The failure of columns may lead to partial or complete collapse of entire building systems. To prepare for an adequate retrofit plan for columns, it is necessary to simulate the cyclic behavior of columns using a numerical model with adequate values of constituent modeling parameters. The nonlinear component modeling parameters are specified in ASCE 41-17. However, the experiments on stocky RC columns suggest that ASCE 41-17 nonlinear component modeling parameters do not reflect the RC column behavior adequately. To accurately simulate the nonlinear load–deformation responses of stocky RC columns with low span-to-depth ratio, this study proposes a calibration factor for ASCE 41-17 RC column modeling parameters. For this purpose, this study collected test data of 47 stocky column specimens. Based on the test data, empirical equations including the calibration factor for modeling parameters “a” and “b” in ASCE 41-17 were proposed. The accuracy of the proposed equation was verified by comparing the measured and calculated envelope curves.
Highlights
Reinforced concrete (RC) buildings not designed according to modern seismic design codes can be vulnerable to collapse during earthquakes [1]
For RC columns, the proposed equations to calculate the effective stiffness are summarized in Table 1, where Ec is the modulus of elasticity of concrete, I g is the moment of inertia of the concrete gross section, Aw is the summation of the net horizontal cross-sectional area for concrete in the direction of loading, and A g is the gross sectional area of the column
The extracted values were compared with the modeling parameters values calculated using the ASCE 41-17 equations
Summary
Reinforced concrete (RC) buildings not designed according to modern seismic design codes can be vulnerable to collapse during earthquakes [1]. Postearthquake researches indicated that columns are one of the most critical structural components in seismically active regions due to their nonductile reinforcement details [2,3,4,5,6]. Curve, instead of using fixed used in to thecalculate previousmodeling standard parameters to construct a backbone curve, instead of using fixed values used in the previous [25] These equations are shown in ASCE 41-17, which lead to better estimation of modeling standard [25]. When the ASCE 41-17 modeling parameter equations are applied to columns low height-to-depth ratios (stocky columns), the estimation error between and estimated with low height-to-depth ratios (stocky columns), the estimation error measured between measured and values may become significant. The the empirical empirical equations equations including including the the calibration calibration factor factor are are proposed proposed from from column regression analyses
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