Volume 57 (2011) Volume 57 – Issue 3 Influence of hybrid fibers on toughtness behavior of high flowing concrete The simultaneous effect of the operating temperature and solar radiation on the efficiency of photovoltaic panels Reliability modeling in some elastic stability problems via the Generalized Stochastic Finite Element Method Selected aspects of failure probability assessment for fire situation A two-scale numerical approach to granular systems Global safety factor for nonlinear design of concrete structures