000019774 001__ 19774
000019774 005__ 20170118182336.0
000019774 04107 $$aeng
000019774 046__ $$k2017-01-09
000019774 100__ $$aMartinelli, Luca
000019774 24500 $$aA Numerical Model for Post-Tensioned Precast Beams With Unbonded Tendons

000019774 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019774 260__ $$b
000019774 506__ $$arestricted
000019774 520__ $$2eng$$aThe modern seismic design of building is concerned with two distinct performance levels: protecting human lives in the case of large earthquakes, and provide structural systems with enhanced functionality by controlling structural damage. A promising resisting structural typology, to limit both generalized cracking as well as residual deformations on structural members, is adoption of unbonded post-tensioned precast concrete beams. In this paper, a numerical model is presented and compared to experimental results. The model was developed to predict the shear-rotation relationship characteristic of unbonded post-tensioned precast concrete beam-columns connections with due attention to capturing the prestress loss due to cyclic loading. The model adopts a recently proposed fiber model, developed within the diffuse plasticity approach. Great care has been devoted to selection of material laws for concrete, focusing on the capability to reproduce the gap-opening gap-closing mechanism at the beam-column interface, which is mainly responsible for of the prestress variation and contributes to possible yielding of the prestressing bars at a prescribed levels of column rotation. The accuracy of the proposed models is illustrated by comparing the predicted behavior in terms of basic mechanical properties, such as shape of the hysteresis, stiffness degradation, failure mode and damage control, with results of recent experiments carried out on cyclically loaded precast beams, post-tensioned using unbonded tendons.

000019774 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019774 653__ $$aprecast beam, unbonded tendons, post-tensioning, modelling strategies, fiber elements, Jointed Connections

000019774 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019774 720__ $$aMartinelli, Luca$$iKono, Susumo$$iGioia, Gianluca
000019774 8560_ $$ffischerc@itam.cas.cz
000019774 8564_ $$s513103$$uhttps://invenio.itam.cas.cz/record/19774/files/4360.pdf$$yOriginal version of the author's contribution as presented on USB, paper 4360.
000019774 962__ $$r16048
000019774 980__ $$aPAPER