This report presents the results of an experimental study that was conducted to investigate the effects of key parameters on the compressive behavior of fiber reinforced polymer (FRP)concrete-steel double-skin tubular columns (FSDT). Hybrid FSDT columns have been introduced as a new form of hybrid columns. They consist of an outer tube made of FRP and inner tube made of steel, with sandwiched c...

Composite steel shear wall is a lateral load resisting system which consists of a steel plate with concrete wall attached to one or both sides to prevent it from elastic buckling. The composite behavior is ensured by utilizing high-strength bolts. This paper investigates the effect of distance between bolts, and for this purpose 14 one-story one-bay specimens with various bolts spacing were mod...

In this paper, the buckling behavior of a composite lattice cylindrical shell is studied and effects of rib defects on the distribution of stress field and buckling response of the shell is investigated. A three dimensional finite element buckling analysis of the lattice shell is carried out using ANSYS suit of program. Geometrical data and material properties of the shell are obtained from the...

Embedded Column Base (ECB) connections in seismically resistant steel moment frames are commonly designed to be stronger than the connected column, protect them from inelastic actions. This relies on estimation of demands induced by column and strength capacity themselves. However, recent research indicates that prevalent approaches may unconservative for both demand estimation, with consequenc...

The purpose of this study is to investigate bending moment and the axial load capacity of a pressurized pipe suffering from a through-wall circumferential crack repaired by a composite sleeve. The three-dimensional finite element method (FEM) was adopted to compute the results, and the failure assessment diagram (FAD) was employed to investigate the failure behavior of the repaired pipe. The fi...

The stability of structures is an important aspect that the designer must pay particular attention to in order ensure safety against collapse. This investigation concerned with analytical and numerical analyses dynamic buckling plane structures. A rigorous mechanical model proposed, consisting a beam-column element nodal ends possessing two rotational springs rigidities acting parallel bending ...

Keywords: Free transverse vibration Vibration mode shapes Double-walled carbon nanotubes (DWCNTs) Nonlocal Rayleigh beam theory Reproducing kernel particle method (RKPM) a b s t r a c t The true understanding of free vibration of double-walled carbon nanotubes (DWCNTs) plays a vital role in optimal design and dynamic control of such nanostructures. This paper is aimed to examine free flexural v...

This paper presents the results of an experimental study into the behavior of concrete-filled steel tube columns confined by fiber-reinforced polymer (FRP). Eleven columns were tested to investigate the effects of the FRP layer number, the thickness of the steel tube and concrete strength on their load capacity and axial deformation capacity. The experimental results indicated that the FRP wrap...

Composite steel girders with concrete have been used for many years and advances in structural fabrication technology established their optimization. One of the changes I-beams during past few has availability web corrugation. The economic design normally requires thin webs. Moreover, using externally prestressed tendons as a strengthening technique controls deflections stresses. However, this ...