000019211 001__ 19211
000019211 005__ 20170118182304.0
000019211 04107 $$aeng
000019211 046__ $$k2017-01-09
000019211 100__ $$aSilva, Pedro
000019211 24500 $$aClosed-Form Solution To P-δ Effects on the Nonlinear Response of Slender Reinforced Concrete Bridge Columns

000019211 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019211 260__ $$b
000019211 506__ $$arestricted
000019211 520__ $$2eng$$aInelastic response of columns is governed by geometrical second-order effects in proportion to their slenderness. Experiments on slender reinforced concrete (RC) columns have demonstrated that second-order effects, namely, nonlinear moment gradient and P-δ moments increase the inelastic demands along the column beyond the limits predicted by current expressions for L pr . In this paper, geometrical nonlinear beam theory in conjunction with a bilinear inelastic momentcurvature section response was utilized to determine: (1) the magnitude by which the inelastic response of RC columns is affected due to their slenderness, (2) a slenderness limit for RC bridge columns defined in terms of design variables, and (3) the influence of different structural, geometrical and material parameters on the vulnerability of slender columns to secondorder actions. To investigate the slenderness effects, a parametric study was conducted on all the possible design configurations that are permitted by the latest seismic design guidelines for bridge columns. It was found that the susceptibility of RC bridge columns to second-order effects were mainly dominated by three parameters, namely, the longitudinal steel reinforcement, axial load, and aspect ratios. This study led to the identification of accurate slenderness limits for the noted parameters beyond which the second-order effects on the inelastic response of RC bridge columns are significant and can no longer be ignored. Recommendations are made based on the presented findings to update the current design guidelines for consideration of second-order effects. Finally, simple expressions are proposed to predict the effects of second-order P-δ moments on the length of the plastic region (L pr ).

000019211 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019211 653__ $$areinforced concrete; slender bridge columns; second-order effects; P-δ moments; parametric study

000019211 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019211 720__ $$aSilva, Pedro$$iBabazadeh, Ata$$iBurgueño, Rigoberto
000019211 8560_ $$ffischerc@itam.cas.cz
000019211 8564_ $$s1277523$$uhttps://invenio.itam.cas.cz/record/19211/files/3095.pdf$$yOriginal version of the author's contribution as presented on USB, paper 3095.
000019211 962__ $$r16048
000019211 980__ $$aPAPER