Stress–strain model for concrete confined by FRP composites

In this paper, a stress–strain model for concrete confined by fiber reinforced polymer (FRP) composites is developed. The model is based on the results of a comprehensive experimental program including large-scale circular, square and rectangular short columns confined by carbon/epoxy and E-glass/epoxy jackets providing a wide range of confinement ratios. Ultimate stress, rupture strain, jacket parameters, and cross-sectional geometry were found to be significant factors affecting the stress–strain behavior of FRP-confined concrete. Such parameters were analyzed statistically based on the experimental data, and equations to theoretically predict these parameters are presented. Experimental results from this study were compared to the proposed semi-empirical model as well as others from the literature

Kompozit Sandviç Kirişlerin Hareketli Yük Etkisi Altında Dinamik Davranış

Konferans Bildirisi -- Teorik ve Uygulamalı Mekanik Türk Milli Komitesi, 2010Conference Paper -- Theoretical and Applied Mechanical Turkish National Committee, 2010Bu çalışmada, tabakalı kompozit elastik kirişlerin, hareketli yük etkisi altında dinamik davranışları incelenmiştir. Hareketli yükün kütle atalet etkileri hesaplarda dikkate alınmıştır. Mod süperpozisyon metodu kullanılarak hareket denklemi değişken katsayılı kısmi türevli diferansiyel denklem şeklinde elde edilmiş ve Newmark metodu ile sayısal çözüm yapılmıştır. Aracın kütlesi ve hızı, tabaka kalınlığı ve lif doğrultusunun dinamik davranış ve kiriş ile araç arasında meydana gelen değme kuvveti üzerindeki etkileri araştırılmıştır.in this study, dynamic response of laminated composite elastic beams subjected to moving loads is investigated. inertial effects of the moving loads are taken into account. The equation of motion with time-dependent coeffıcients for the beam is derived in matrix form by using the assumed mode method and is solved numerically by Newmark's method. Effects of the vehicle mass, vehicle speed, lamina thickness, and fiber orientation on the response and the contact force between the mass and the beam are studied