Precast Lightweight Foamed Concrete Sandwich Panel (PLFP) Tested under Axial Load: Preliminary Results

2011 ◽  
Vol 250-253 ◽  
pp. 1153-1162 ◽  
Author(s):  
Noridah Mohamad ◽  
Wahid Omar ◽  
Redzuan Abdullah
Keyword(s):  
Axial Load ◽  
Sandwich Panel ◽  
Load Capacity ◽  
Slenderness Ratio ◽  
Axial Loading ◽  
Load Test ◽  
Insulation Layer ◽  
Percentage Difference ◽  
Steel Bars ◽  
Foamed Concrete

A study is carried out to develop a Precast Lightweight Foamed Concrete Sandwich Panel, PLFP, as a new and affordable building system. Experimental investigation to study the behaviour of the panel under axial load is undertaken. The panel consists of two lightweight foamed concrete wythes and a polystyrene insulation layer in between the wythes. The concrete panels are reinforced with 9mm diameter high tensile steel bars. The rebars are tied to each other through the insulation layer by shear connectors which are made of 6mm mild steel bars bent to 45º angle. Total number of four specimens was tested with one specimen; PA1 was cast without capping at both ends. It was used as a pilot test. The other three specimens are capped with normal concrete at both ends to avoid end crushing during axial loading. Axial load test was conducted and the results are presented here, which include the ultimate load capacity, crack pattern and failure mode, strain distribution and load-deflection curve of the panels. The experimental ultimate strength achieved recorded lesser percentage difference with the formulae by Pillai and Parthasarathy when compared to formulae in BS8110. It is also observed that the strength of the panels are affected by the compressive strength of the foamed concrete forming the wythes, the presence of concrete capping at panel’s ends and the slenderness ratio, H/t. Specimens with capping at both ends recorded higher ultimate loads with no premature crushing. Failure of panels with slenderness ratio, H/t < 18 were by premature buckling near the supports whereas for panels with higher H/t ratio, slight bending was observed in the middle zone. The results also indicate that a certain degree of compositeness is achieved between the wythes.

Study the Behavior of Castellated Steel Column Encasing by Different Reactive Powder Concrete Thickness with Laced Reinforcement

2021 ◽  
Vol 895 ◽  
pp. 97-109
Author(s):  
Mustafa Mazin Ghazi ◽  
Ahmad Jabbar Hussain Alshimmeri
Keyword(s):  
Axial Load ◽  
Local Buckling ◽  
Axial Loading ◽  
Longitudinal Axis ◽  
Load Test ◽  
Reactive Powder Concrete ◽  
Control Group ◽  
Load Carrying ◽  
Steel Column ◽  
Reactive Powder

Castellated columns are structural members that are created by breaking a rolled column along the center-line by flame after that rejoining the equivalent halves by welding such that for better structural strength against axial loading, the total column depth is increased by around 50 percent. The implementation of these institutional members will also contribute to significant economies of material value. The main objectives of this study are to study the enhancement of the load-carrying capacity of castellated columns with encasement of the columns by Reactive Powder Concrete (RPC) and lacing reinforcement, and serviceability of the confined castellated columns. The Castellated columns with RPC and Lacing Reinforcement improve compactness and local buckling (web and flange local buckling), as a result of steel section encasement. This study presents axial load test results for four specimens Castellated columns section encasement by Reactive powder concrete (RPC) with laced reinforcement. The encasement consists of, flanges unstiffened element height was filled with RPC for each side and laced reinforced which are used inclined continuous reinforcement of two layers on each side o0f the web of the castellated column. The inclination angle of lacing reinforcement concerning the longitudinal axis is 45o. Four specimens with four different configurations will be prepared and tested under axial load at columns. The first group was the control group (CSC1) Unconfined castellated steel column, the second group was consists of Castellated columns (web and flange) confined with 17mm of (RPC), welded web, and 6mm laced reinforcement (CSC3). While group three (CSC4) consists of a Castellated steel column same as the sample (CSC3), but without using welding between two parts of the castellated steel column. Groups four and five consist of a Castellated steel column same as sample (CSC4) encased partially with reactive powder concrete (25.5 mm) (CSC5) and full encased flange with reactive powder concrete (34mm) mm (CSC6), respectively. The tested specimens' results show that an increase in the strength of the column competitive with increasing the encased reactive powder concrete thickness. And the best sample was sample CSC6 with (34mm) mm in experimental and ABAQUS results.

scholarly journals Structural Performance of Precast Foamed Concrete Sandwich Panel Subjected to Axial Load

2018 ◽  
Vol 22 (4) ◽  
pp. 1179-1192 ◽  
Author(s):  
Y. H. Mugahed Amran ◽  
Raizal S. M. Rashid ◽  
Farzad Hejazi ◽  
A. A. Abang Ali ◽  
Nor Azizi Safiee ◽  
...  
Keyword(s):  
Axial Load ◽  
Sandwich Panel ◽  
Structural Performance ◽  
Foamed Concrete

Accelerated corrosion investigation of axially loaded reinforced concrete elements

2014 ◽  
Vol 61 (4) ◽  
pp. 215-223 ◽  
Author(s):  
Christos Zeris ◽  
George Batis ◽  
Vassilios Mouloudakis ◽  
John Marakis
Keyword(s):  
Reinforced Concrete ◽  
Axial Load ◽  
Load Capacity ◽  
Axial Loading ◽  
Load Level ◽  
Concrete Cover ◽  
Chloride Ingress ◽  
Reinforced Concrete Column ◽  
Accelerated Corrosion ◽  
Content Type

Purpose – This paper aims to present results of an experimental investigation on a series of scaled reinforced concrete column elements which were subjected to chloride exposure under accelerated conditions under a concurrent service axial load, over a period. In the presence of an axial load, directed microcracks of increasing density and width are introduced in the concrete mass, depending on the axial load level. Such cracks are believed to enhance the intrusion rate of chlorides in the concrete, relative to what is obtained in the normally performed unloaded specimen tests. Design/methodology/approach – Eighteen column specimens were tested over two chloride exposure periods, of duration up to a maximum of six months. Three different service axial load levels were considered, namely, none, 22 per cent and 43 per cent of the normalized axial load capacity of the columns. Findings – The results indicate that the specimens loaded to the higher axial load, which closely resembles actual service situation of such type of elements, exhibited up to ten times faster rates of induced current flow under a constant applied voltage of 500 mV, compared to the unloaded and less loaded specimens. Practical implications – It is proven that the presence of axial load influences the rate of chloride ingress in columns and, therefore, should be taken into account in estimating the concrete cover of such elements in durability design. Originality/value – The influence of axial loading on corrosion rate has not been considered in published experimental and analytical studies of chloride ingression. These studies have typically so far considered the accelerated corrosion of unloaded column specimens.

scholarly journals Investigation of Load Capacity of Steel Concrete Composite Columns Src Reinforced by IPE

2019 ◽  
Vol 29 (2) ◽  
pp. 101-116
Author(s):  
Peyman Beiranvand ◽  
Matin Abdollahifar ◽  
Ahmad Moradpour ◽  
Saeideh Sadeghi Golmakani
Keyword(s):  
Finite Element ◽  
Axial Force ◽  
Axial Load ◽  
Load Capacity ◽  
Axial Loading ◽  
Bending Moment ◽  
Axial Deformation ◽  
Composite Columns ◽  
Finite Element Software ◽  
Deformation Interaction

Abstract In this study, a column with section IPE and different lengths, completely embedded in concrete, is modelled by finite element software ABAQUS. Columns under different bi-axial loading were used and graphs of axial force-axial deformation, interaction axial force, and bending moment and column curve were mapped. The results show that the load capacity of the column, with increasing length and also increasing eccentricity of the axial load, will be reduced. With increasing length, the effect of an increased eccentricity of the reduced load capacity was increased. Equations for the design of the column are also presented. The results of the presented equations were compared with the values obtained from finite element and building national institute 10th topic.

Behaviour of Composite Column of Cold-Formed Steel Section without Web Stiffener Integrated with Ferrocement Jacket

2015 ◽  
Vol 752-753 ◽  
pp. 528-532
Author(s):  
Anis Saggaff ◽  
Khaled Alenezi ◽  
Mahmood Md Tahir ◽  
Talal Alhajri ◽  
Mohamad Ragae
Keyword(s):  
Axial Load ◽  
Load Capacity ◽  
Axial Loading ◽  
Column Height ◽  
Composite Column ◽  
Compression Load ◽  
Composite Columns ◽  
Strength Capacity ◽  
Cold Formed Steel ◽  
Steel Section

Cold-formed steel (CFS) is known to be a thin section. Thus it is considered a weak slender steel section which limits the compression capacity of the column. The aim of this study was to determine the ultimate capacity of built-up lipped CFS (assembled with ferrocement jacket) as composite column (CFFCC) under axial compression load. Nine specimens of composite columns were prepared and tested. The main parameters that varied in the CFFCC columns were column height, cold-formed steel thickness, and influence of ferrocement jacket. There were are three different heights of the CFFCC composite column namely 2000mm, 3000mm and 4000mm used in this study. All CFFCC columns were tested under axial load by a thick steel plate. The results indicated that ferrocement jacket provided sufficient lateral support to the column web and significantly increased both the strength and ductility of the specimens under axial loading. The strength capacity of CFFCC improved significantly, about 149% greater than that of bare steel column section. It was also found that the axial load capacity of CFS-ferrocement jacket composite columns (CFFCC) had increased significantly (in the range of 20% to 40%) as thickness of CFS increased.

scholarly journals Load Deflection and Ultimate Strength Properties of Sandwich Lightweight Foamed Concrete Panels

2021 ◽  
pp. 1-17
Author(s):  
Alonge O. Richard ◽  
Opatade J. Adeolu ◽  
Olusola Ololade Afolake
Keyword(s):  
Mild Steel ◽  
Sandwich Panel ◽  
Precast Concrete ◽  
Steel Wire ◽  
Strength Properties ◽  
Load Test ◽  
Wire Mesh ◽  
High Yield ◽  
Concrete Panels ◽  
Foamed Concrete

The interaction that exists between two wythes of concrete, inner and outer, goes a long way to establish the structural behavior of the whole components and particularly, lightweight foamed concrete sandwich panel. Precast concrete sandwich panel (PCSP) has become a household name since it has been utilized in the construction of structural shell in some building types. This research investigated the load deflection of six different lightweight foamed concrete panels. The six panels were produced using a foamed concrete mix of the same density and the mechanical properties of the mix were tested. Each panel consists of two withes (facings) made of lightweight foamed concrete and polystyrene was used as the core and the insulation layer. Mild steel wire mesh of 6mm sizes was used as reinforcement in three of the panels while 9mm diameter high yield steel was used in the remaining three panels. The reinforcement in both facing was tied together using shear and bend to an angle of 450.End crushing of the panels was avoided using concrete capping. An axial load test was conducted, the load deflection, mode of failure and crack patterns of the panels was observed. The result also revealed that panels with concrete capping deflect along with their Wythe in the same directions and small deflection was recorded in panels with concrete capping. Cracking modes in panels reinforced with 6mm mild steel were controlled by material failure while those in panels with 9mm high yield steel, cracks was only observed at the lower part of the capping.

scholarly journals An experimental study on the structural performance of reinforced concrete low-rise building columns subjected to axial loading

2020 ◽  
Vol 14 (1) ◽  
pp. 103-111
Author(s):  
Pham Xuan Dat ◽  
Nguyen Anh Vu
Keyword(s):  
Reinforced Concrete ◽  
Axial Load ◽  
Load Capacity ◽  
Axial Loading ◽  
Structural Performance ◽  
Building Structures ◽  
Test Results ◽  
Structural Elements ◽  
Axial Load Capacity ◽  
Geometrical Dimensions

It has been commonly recognized by the international research and practice community that the presence of both outer and inner stirrups may significantly enhance the axial load capacity of reinforced concrete (RC) columns. However, there is limited testing evidence to support this conclusion that has been published nationally. This paper reports an experimental programme to study the effectiveness of stirrup detailing on the structural performance of columns having small sectional dimensions that are common in low-rise building structures. Nine column specimens with the same geometrical dimensions of 220 mm x 220 mm x 880 mm in three batches were detailed with different stirrup categories, have been gradually axially loaded to failure. The test data have revealed that although the presence of stirrups can generally enhance the axial load capacity of the column specimens, the enhancing levels are much dependent to the shapes of the stirrups. Selected interesting aspects of the test results have also been discussed, which set a concrete base for recommendations for design and detailing of such vertical structural elements. Keywords: experimental investigation; low-rise building columns; axial load capacity; stirrups.

scholarly journals Experimental Study on the Behavior of X-Section Pile Subjected to Cyclic Axial Load in Sand

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Yiwei Lu ◽  
Hanlong Liu ◽  
Changjie Zheng ◽  
Xuanming Ding
Keyword(s):  
Axial Load ◽  
Large Scale ◽  
Cross Sectional Area ◽  
Load Test ◽  
Dynamic Responses ◽  
Scale Model ◽  
Loading Frequency ◽  
Sectional Area ◽  
Cross Sectional ◽  
Shaft Friction

X-section cast-in-place concrete pile is a new type of foundation reinforcement technique featured by the X-shaped cross-section. Compared with a traditional circular pile, an X-section pile with the same cross-sectional area has larger side resistance due to its larger cross-sectional perimeter. The behavior of static loaded X-section pile has been extensively reported, while little attention has been paid to the dynamic characteristics of X-section pile. This paper introduced a large-scale model test for an X-section pile and a circular pile with the same cross-sectional area subjected to cyclic axial load in sand. The experimental results demonstrated that cyclic axial load contributed to the degradation of shaft friction and pile head stiffness. The dynamic responses of X-section pile were determined by loading frequency and loading amplitude. Furthermore, comparative analysis between the X-section pile and the circular pile revealed that the X-section pile can improve the shaft friction and reduce the cumulative settlement under cyclic loading. Static load test was carried out prior to the vibration tests to investigate the ultimate bearing capacity of test piles. This study was expected to provide a reasonable reference for further studies on the dynamic responses of X-section piles in practical engineering.

Vibration of Beams with a Single Delamination under Axial Loading

2011 ◽  
Vol 675-677 ◽  
pp. 477-480
Author(s):  
Dong Wei Shu
Keyword(s):  
Free Vibration ◽  
Natural Frequency ◽  
Analytical Solutions ◽  
Axial Load ◽  
Natural Frequencies ◽  
Axial Loading ◽  
Composite Beams ◽  
Mode Shapes ◽  
Equilibrium Conditions ◽  
Monotonic Relation

In this work analytical solutions are developed to study the free vibration of composite beams under axial loading. The beam with a single delamination is modeled as four interconnected Euler-Bernoulli beams using the delamination as their boundary. The continuity and the equilibrium conditions are satisfied between the adjoining beams. The studies show that the sizes and the locations of the delaminations significantly influence the natural frequencies and mode shapes of the beam. A monotonic relation between the natural frequency and the axial load is predicted.

Sign in / Sign up

Export Citation Format

Share Document