Issue 36

A. Namdar et alii, Frattura ed Integrità Strutturale, 36 (2016) 168-181; DOI: 10.3221/IGF-ESIS.36.17 175 Figure 6 : Maximum displacement Vs crack length. Figure 7 : Maximum von Mises Vs crack length. Figure 8 : Maximum von Mises Vs displacement. Figure 9 : Maximum reaction load at fixed support Vs displacement in the center of the beam at different models. N ONLINEAR ANALYSIS OF BEAMS he nonlinear forcing frequency with different direction and frequency has been applied on the beam. The force and its frequency are called the exciting frequency or forcing frequency. Beams constructed from NSC and UHPC subjected to forcing frequency. In order to comparative linear collapse mechanism with nonlinear collapse mechanism. The mode 1 of forcing frequency has been selected for nonlinear collapse mechanism of beam. The mode 1 of forcing frequency is in same direction of linear cracking moment. During applied forcing frequency of mode 1, beam displacement-crack exhibit same in both NSC and UHPC models, there is direct relationship between displacement and crack lengths (Fig. 10 and Tab. 7). The displacement increased with increasing crack length. There is not effect of mechanical property in displacement. In this mode, according mechanical propertied of NSC and UHPC, the maximum dynamic toughness has been observed in higher strength concrete. In comparative nonlinear behavior with linear elastic behavior of beams, the von Mises and reaction load exhibited differently (Figs. 10-14 and Tabs. 7-9). In both nonlinear and linear cases, with increase crack displacement increased. T