000018444 001__ 18444
000018444 005__ 20170118182222.0
000018444 04107 $$aeng
000018444 046__ $$k2017-01-09
000018444 100__ $$aPrakash, Suriya
000018444 24500 $$aImproved Hysteresis Model for Reinforced Concrete Columns Under Cyclic Torsional Loading

000018444 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018444 260__ $$b
000018444 506__ $$arestricted
000018444 520__ $$2eng$$aIt has been observed in the past that, reinforced concrete (RC) bridge columns are, very often, subjected to torsional moment in addition to flexure and shear during seismic vibration. However, the torsional moment is generally ignored in typical design practices. Previous studies have shown that, ignoring torsional moment may lead to brittle shear failure of the columns triggering collapse of the entire or part of the bridge structure. Therefore, rational models need to be developed to consider the effect of torsion in the design of RC bridge columns. Performance based seismic design is an emerging design concept which calls for accurate prediction of the hysteresis behavior of structural elements to ensure safe and sustainable design under earthquake loading. However, very few investigations in the past focused on the development of analytical model to accurately predict the response of RC members under cyclic torsion. Though quite a good number of models are available for prediction of shear and flexural hysteresis, they are not readily applicable for torsion owing to significant pinching and stiffness degradation associated with torsional loading. Hysteresis models taking into account pinching and stiffness degradation effect under cyclic torsional loading are scarce. The present study aims at filling this knowledge gap by proposing an improved polygonal hysteresis model which can accurately predict the hysteretic behavior of RC circular columns under torsion. The proposed empirical model is validated through experimental data of two circular columns tested under pure torsion. Close correlation is observed between the predicted and measured torque-twist curves.

000018444 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018444 653__ $$aPolygonal hysteresis model; RC column; torsion; primary curve; unloading and reloading rules.

000018444 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018444 720__ $$aPrakash, Suriya$$iMondal, Tarutal Ghosh$$iKothamuthyala, Sriharsha
000018444 8560_ $$ffischerc@itam.cas.cz
000018444 8564_ $$s590097$$uhttps://invenio.itam.cas.cz/record/18444/files/1471.pdf$$yOriginal version of the author's contribution as presented on USB, paper 1471.
000018444 962__ $$r16048
000018444 980__ $$aPAPER