To investigate the ultimate bearing capacity and deformation of recycled self-compacting concrete-filled circular steel tubular (RSCCFCST) long columns subjected to axial load, nine specimens with different concrete (RSCC) strength grades slenderness ratios are tested. The experimental results indicate that lateral deflection dominates buckling failure specimens. is enhanced gradually as RSCC g...

The test results on the performance of carbon fiber-reinforced polymer (CFRP)-confined reinforced concrete (RC) columns under axial compression load are presented in this study. Twelve slender CFRP-confined circular RC with a diameter 200 mm were divided into two groups. Six specimens different slenderness ratios 12, 20, 32, 40, 48, and 56 contained each group. experimental demonstrated circumf...

A graph is concave-round if its vertices can be circularly enumerated so that the closed neighbourhood of each vertex is an interval in the enumeration. In this work, we give a minimal forbidden induced subgraph characterization for the class of concave-round graphs, solving a problem posed by Bang-Jensen, Huang, and Yeo [SIAM J Discrete Math, 13:179– 193, 2000]. In addition, we show that it is...

Abstract:   The theory of optimization has improved remarkably during the last four decades. The main part of optimizing investigations has been focused on enhancing buckling resistance which does not violate the economic feasibility of final design. The finite element analysis which is called ESO (Evolutionary Structural Optimization) is presented for optimum (or most ideal) design of c...

The present paper examines the energy absorption capacity of concrete-filled steel tube slender (CFTS) columns having different aspect ratios. CFTS are nonlinearly analysed employing finite element software ABAQUS. In order to validate simulation columns, an experimentally tested column is simulated and its achieved result compared with that column. Since it concluded there a good agreement bet...

This paper presents the development and experimental validation of a multizard bridge pier concept, i.e., a bridge pier system capable of providing an adequate level of protection against collapse under seismic and blast loading but not acting simultaneously . A multicolumn pier-bent with concrete-filled steel tube CFST columns is the proposed concept, and the adequacy of this system is experim...