fiber reinforced polymers (frp) have widely used for the purposes of enhances strength and ductility of concrete columns. proper design of such hybrid columns, however, requires a better recognition of the behavior of concrete columns confined with frp. in this paper, the influence of frp thickness, concrete compressive strength, and column size on the performance of eccentrically loaded reacti...

At present, there is a lack of research on the influence different dynamic constitutive models steel and concrete mechanical properties concrete-filled tubular (CFST) columns under lateral impact. In this paper, A comprehensive numerical study effects impact response CFST was conducted. The with strengths were divided into four categories, namely, normal-strength steel, high-strength concrete. ...

This paper introduces an experimental work to study the behavior of 12 recycled aggregate concrete-filled steel tubular (RACFST) short columns with high-strength concrete grade subjected axial compression loading. These formed from six different cross-sections involving triangle, elliptical, and hexagon, whereas other three sections included traditional forms for control purposes, square, recta...

The vulnerability of framed structures has been analyzed until recently from two different perspectives: Structural and socio-economical. For the sake of assessing the former, indexes and objective measurements have been proposed in the literature. These indexes include relatively accurate assessments of the strength, ductility, energy absorption, fire, blast response and resilience of the elem...

The objective of this study was to investigate the effectiveness different confinement materials in strengthening geopolymer concrete (GP) columns subjected axial compression loading. This research encompassed both experimental and numerical analyses. phase involved testing seven circular GP columns, while developing 3D finite element (FE) models using ABAQUS software. primary focus assess impa...

Given the deterioration of civil infrastructure throughout world, developing more efficient repair and strengthening is essential. Jacketing one most common methods for retrofitting reinforced concrete (RC) columns. Notably, using engineered cementitious composite (ECC) within jacketing area increases bearing capacity significantly enhances ductility The recent development ECC with suitable com...

Installation of granular columns is a cost-effective and versatile in situ technique to improve the shear strength, settlement, drainage behavior weak soils. It involves backfilling vertical boreholes ground with materials stiffer than native soil, such as stone or compacted sand. However, massive use overexploitation sand natural aggregates have depleted their reserves recent decades, causing ...

A simple perturbation theory of the frequencies and density distortions of the I= 1 diocotron mode on pure electron plasma columns is presented. This mode is the dynamical state of an off-axis electron column which is orbiting around the containment axis at the ExB drift velocity. The theory predicts shifts in the orbit frequency and quadrupole distortions of the plasma surface, both varying as...

Ai = Prismatic joints along the horizontal circular guide Bi = Spherical joints on the moving platform Ci = Prismatic joints on the vertical columns (i = 1,2,3) {F} = Fixed global reference frame {M} = Moving frame α, β, γ = ZYX Euler angles of rotation about the three joint axes of rider. α', β', γ', δ' = ZYXZ’ Euler angles of rotation about the four joint axes of chair on the moving platform ...

Soft marine clays are very sensitive to changes in the stress system, moisture content and system chemistry of the pore fluid. Geotechnical engineers feel a necessity to improve the behavior of these deposits using anyone of the available ground improvement techniques. In the present investigation an attempt has been made to improve the permeability of a marine clay using the lime column techni...