000019437 001__ 19437
000019437 005__ 20170118182318.0
000019437 04107 $$aeng
000019437 046__ $$k2017-01-09
000019437 100__ $$aRojas, Fabian
000019437 24500 $$aAnalytical Considerations for Reinforced Concrete Walls in the Design Practice in Chile

000019437 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000019437 260__ $$b
000019437 506__ $$arestricted
000019437 520__ $$2eng$$aSlender rectangular walls with discontinuities at their bases, such as flag walls (setback) or walls with door openings or access, are common in Chilean practice because of the architectural requirements at facades, first floors and underground. Also, the architectural requirements and Chilean idiosyncrasy have forced to the designers to use several wall sections located in a vast area of the floor plan, resulting in many cases in T-shaped walls, with long webs or flanges, which produced large amount of reinforcement in the boundary elements. Many of these types of walls were imposed with large displacement demands in the 2010 Maule earthquake in Chile, and presented flexo-compression failures in the boundary elements, often close to their discontinuities. These observations have shown the need to establish good predictors of compressive or tensile strains in concrete or steel in reinforced concrete shear rectangular with discontinuities and T-shaped walls that leads to limit states or confinement requirements. However, there is limited information about the behavior of such elements, and no designs or guidelines in the current codes consider the effects of discontinuities at the base and the effect of T-shaped walls, especially with long flanges or web. In this work, a series of analysis that help to incorporate the effect of discontinuities and cross-section, along with different aspect ratios and other considerations in the yield and ultimate curvature, compressive amplification or tensile reduction strains in concrete or steel, and effective flange width for the designs of slender walls are presented, and design recommendations are proposed. First, the elastic and inelastic components of flexural deformations by means of a fiber model for slender rectangular walls is calibrated and it was found that the elastic component is dependent on the axial load and the boundary steel reinforcement ratio. Additionally, two analytical models are presented that estimate the yield displacement, yield curvature and ultimate curvature of walls with openings, such as flag walls (setback), mainly based on the dimensions of the opening calibrated from a parametric analysis of a non-linear finite element model. The results indicate that these discontinuities can reduce the elastic displacement, due to the presence of a more rigid section above the opening, and in the inelastic component, increasing the strain demands at the base because the opening tends to constrain the plastic hinge within that area. Lastly, in addition of predictors of maximum tensile and compressive strains for T-shaped walls, the effective flange width for different aspect ratios, length of the flange and the web, is studied and compared with actual code recommendation.

000019437 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000019437 653__ $$aslender wall; discontinuities; higher modes; shear amplification.

000019437 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000019437 720__ $$aRojas, Fabian$$iAlfaro, Jorge$$iAhumada, Matias$$iHernandez, Ariel$$iMassone, Leonardo
000019437 8560_ $$ffischerc@itam.cas.cz
000019437 8564_ $$s1396644$$uhttp://invenio.itam.cas.cz/record/19437/files/3622.pdf$$yOriginal version of the author's contribution as presented on USB, paper 3622.
000019437 962__ $$r16048
000019437 980__ $$aPAPER