Geometric imperfections such as radial imperfection, diamond shape, and local dimples could affect the buckling mode and load carrying capacity of axially compressed steel tubular columns. This paper experimentally investigates the effect of radial imperfection on the load carrying capacity of tubular columns. Test samples include 100 specimens with different values for diameter, length, thickn...

Concrete-filled steel tubular (CFST) columns are composite sections that may contribute to reduce the environmental impact in construction through a more efficient use of resources. By embedding profile inside CFST section, new typology is generated, so-called steel-reinforced concrete-filled (SR-CFST) columns, which enhance not only structural capacity these at room temperature but also their ...

Thin-walled open cross-sections are commonly used in steel storage pallet rack structures. In some cases, sections employed as beam members. These members usually have weld spots along their length order to reduce the distortional deformation under a flexural load. On other hand, typically connected columns by means of claws, which exhibit nonlinear moment - rotation relationship. two character...

the rotational friction dampers can be improved the seismic behavior of the steel structures, and they can be reduced the internal forces in the bracing members, columns and the other structural members. in this research, a simple method for modeling and analysis of braced frames equipped by these dampers is proposed. the proposed model describes seismic behavior of dampers very well and it is ...

To study the cold-forming effect on yield strength distribution of cold-formed thick-walled steel, material tensile tests and axial compression were conducted steel-lipped channels. undertake tests, five types lipped channel sections with varied thicknesses nominal strengths selected. The test samples taken from web, flange, curled edge, corner sections, respectively. Next, a corresponding mode...

The experimental study presented in this paper aimed to examine the performance of cold-formed steel built-up section beam-columns experiencing non-uniform bending. test program was performed on open and closed sections that were manufactured from grades G500 G550 zinc-coated sheets. specimens assembled by connecting two identical channels with discrete connectors along longitudinal direction. ...

We study theoretically the propagation of elastic waves in two-dimensional composite media composed of a square array of hollow steel cylinders embedded in water using the finite-difference time-domain method. These composite media constitute a class of acoustic band gap materials with narrow pass bands in their transmission stop bands. The frequency at which the pass band occurs is tunable by ...

OBJECTIVE To (1) mechanically evaluate polymethylmethacrylate (PMMA) columns of various sizes and compare them to connecting bar materials (carbon fiber composite, titanium, stainless steel) and (2) compare the properties of an intact PMMA column to those of an acrylic interface. STUDY DESIGN Experimental mechanical study. SAMPLE POPULATION Experiment 1: 6 groups of 6 specimens each; experi...

The objective of this paper is to provide guidance for the design of the thick-walled cylinder made up of transversely isotropic material so that collapse of cylinder due to influence of internal and external pressure can be avoided. The concept of transition theory based on Lebesgue strain measure has been used to simplify the constitutive equations. Results have been analyzed theoretically an...