scholarly journals Axial Compressive Performance of a Composite Concrete-Filled GFRP Tube Square Column

2021 ◽  
Vol 11 (15) ◽  
pp. 6757
Author(s):  
Jiancheng Lu ◽  
Yujun Qi ◽  
Yifei Li ◽  
Xuxu Wang
Keyword(s):  
Bearing Capacity ◽  
Load Capacity ◽  
Peak Load ◽  
Strain Curve ◽  
Displacement Curve ◽  
Composite Column ◽  
Composite Columns ◽  
Compressive Performance ◽  
New Type ◽  
The Impact

A composite concrete-filled glass fiber reinforced polymer (GFRP) tube square column is a new type of composite column, where GFRP is externally wrapped over several GFRP square tubes to form a multicavity GFRP tube, and then concrete is poured inside. External GFRP wrapping methods can be divided into two types: entirely wrapped and strip-type wrapped methods. The former is superior to the latter in terms of performance under stress. However, difficulties are introduced in the construction process of the former, and substantial materials are required to wrap the entire structure. To examine the axial compressive performance for this new type of composite column and the impact of the wrapping method, we designed and fabricated one type of entirely wrapped composite column and two types of strip-type wrapped composite columns with clear spacings of 85 mm and 40 mm, respectively, and performed static axial compression tests. Through tests and numerical simulations, we obtained the failure mode, load–displacement curve, and load–strain curve of the specimen, and analyzed the impact of the externally wrapped GFRP on the mechanical behavior of the composite column. The results show that the composite column reached the peak load before the fracture of the GFRP tube fiber occurred, and the bearing capacity declined sharply to approximately 75% of the peak load after the fiber fractured, then entered a platform section, thereby displaying ductile failure. As the wrapped layers of GFRP strips increased, the load capacity of the specimen exhibited a linear growth tendency. Compared with the performance of the entirely wrapped method, the load capacity of the specimens in the W5040 group declined 9.8% on average, and the peak efficiency of the GFRP strips increased by 50%, thereby indicating that the use of appropriate GFRP layers and strip distance intervals can ensure the appropriate bearing capacity of composite columns and full utilization of GFRP material properties.

Experimental Study on Circular Hybrid SCCC Columns under Axial Compressive Load

2011 ◽  
Vol 368-373 ◽  
pp. 369-372
Author(s):  
Zhu Yan Li ◽  
Yong Jun Liu ◽  
Dong Wang
Keyword(s):  
Bearing Capacity ◽  
Test Specimen ◽  
Compressive Load ◽  
Strain Curve ◽  
Steel Tube ◽  
Ultimate Bearing Capacity ◽  
Displacement Curve ◽  
Compressive Performance ◽  
Core Concrete

The tests are order to investigate the axial compressive performance of the new circular hybrid Steel-Concrete- CFRP-Concrete column (simply called SCCC column).SCCC column is composed of steel tube, annular concrete, CFRP tube and core concrete. Axial ultimate bearing capacity test was performed on 3 SCCC columns, from which we gains the law of affecting SCCC columns, the load-strain curve and load-displacement curve of SCCC columns, and compare the test results of the test specimen with different annular concrete thicknesses, from which we finds that after the relationship curve of test specimen with small annular concrete thickness reaches yield load, the bearing capacity starts to decline, and then continues to rise till the ultimate load is reached and the test specimen is damaged. The result shows that the smaller the annular concrete thickness is, the greater the axial ultimate bearing capacity of SCCC column is, and also indicates that CFRP tube plays a role of binding and constraining to the core concrete in later period of loading the test specimens.

Behaviour of Composite Column of Cold-Formed Steel Section with Web-Stiffener Integrated with Ferrocement Jacket

2015 ◽  
Vol 752-753 ◽  
pp. 533-538
Author(s):  
Khaled Alenezi ◽  
Mahmood Md Tahir ◽  
Talal Alhajri ◽  
Mohamad Ragae
Keyword(s):  
Compressive Strength ◽  
Axial Load ◽  
Load Capacity ◽  
High Ratio ◽  
Column Height ◽  
Composite Column ◽  
Composite Columns ◽  
Axial Load Capacity ◽  
Strength Capacity ◽  
Cold Formed Steel

Cold-formed steel (CFS) is known as slender or class 4 section due to high ratio of web-to-thickness ratio. The compressive strength of this type of section is usually very low as it tends to fail due to distortion and warping before reaching the actual compressive strength. The aim of this study is to determine the ultimate capacity of build-up lipped CFS assembled with ferrocement jacket where web-stiffener is provided as the proposed composite column (CFFCC) is under axial compression load. Nine specimens of composite columns were prepared and tested. The main parameters varied in the CFFCC columns are column height, cold-formed steel thickness and influence of ferrocement jacket and web-stiffener. There 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 where a thick steel plate is used to evenly distribute the applied load. The results show the effect of providing both the ferrocement jacket to increase the confinement effect and the web stiffener to provide sufficient lateral support to the column web. A significant increase in both the strength and the ductility of the specimens under axial loading has been recorded. The strength capacity of CFFCC has been improved by about 178% greater than that of bare steel column. Also it is found that, axial load capacity of CFS-ferrocement jacket composite columns (CFFCC) were increased with the increase in thickness of CFS. The use of web-stiffener has improved the axial load capacity of the column but not that significant.

scholarly journals Experience of application of the measuring complex «Measurement System for testing permanent bridges» to determine the possibility of passing on permanent bridges of superheavy loads

2019 ◽  
Vol 6 (3) ◽  
Author(s):  
Evgeny Lugovtsev ◽  
Michael Erofeev
Keyword(s):  
Bearing Capacity ◽  
Measurement System ◽  
Load Capacity ◽  
Measuring System ◽  
Technical Diagnostics ◽  
Vertical Movements ◽  
Test Load ◽  
Measuring Complex ◽  
Mobile Test ◽  
The Impact

The article presents the experience of using the measuring complex SI-PPM 15N1955 to determine the possibility of passing on permanent bridges of superheavy loads used by military engineers. The first part of the article substantiates the need to examine a large number of bridges of various designs on the routes of exit and maneuver of the troops, which in turn puts before the engineering service of associations and connections serious tasks to determine the load capacity of artificial structures on roads. In the 2000s, specialists of the Military engineering Academy and the Moscow Institute of heat engineering developed a unified method for determining the bearing capacity of reinforced concrete beam bridges, which was implemented by STC «Technical diagnostics and precision measurements» in a portable measurement system to check the permanent bridges SI-PPM 15N1955. The basis for the creation of SI-PPM is the calculation and experimental method of operational (on-site testing) determination of the state of the load-bearing structures of permanent bridges, using multi-channel measurements of angular and corresponding vertical movements of various sections of the main beams of superstructures from the impact of mobile test load. Unlike traditional methods of measuring deflections unacceptable in complexity and time of the survey of permanent bridges for the passage of modern missile systems. The main part of the article describes the measurement system. The bearing capacity of a particular bridge span is determined in the calculation program «Bridge» (the structure is presented in the article), which is part of the system. To determine the possibility of skipping the unit for a specific span of the bridge, the calculation program uses the angles of rotation of the main beams of the bridge near the supports from the impact of the mobile test load on the span, the arrangement of the wheels and the weight on the axes for the test load and the unit as the initial data. To learn how to operate the measuring system SI-MRP developed program simulator.

Study on Mechanical Behavior of Aerated Concrete Block Infill Wall under Out-of-Plane Action

2014 ◽  
Vol 584-586 ◽  
pp. 964-967
Author(s):  
Yi Sun ◽  
Yuan Ming Dou ◽  
Hong Liang Cui
Keyword(s):  
Load Capacity ◽  
Academic Research ◽  
Concrete Block ◽  
Displacement Curve ◽  
Loading Test ◽  
Infill Wall ◽  
Out Of Plane ◽  
Static Loading Test ◽  
Aerated Concrete ◽  
The Impact

The influence of insulation firewall on structure stiffness and the mechanical property of firewall in plane have been more mature in the academic research, but its out-of-plane mechanics is not complete at home and abroad. In this paper, static loading test of aerated concrete block filler wall was designed. Through the cracking loads, ultimate loads, failure loads and load-displacement curve of six walls, we make judgment of the impact on infill wall out-of-plane properties and failure morphology. The results indicate that the mainly failure pattern is horizontal crack and diagonal crack, the destroy position is concerned with the strength of four boundary constraints and the load capacity of infill walls can improve greatly after cracking, the height-thickness ratio is the decisive factor.

Nonlinear Finite Element Analysis of the Bearing Capacity of a New Type of Column under Axial Load

2011 ◽  
Vol 255-260 ◽  
pp. 45-48 ◽  
Author(s):  
Ya Feng Xu ◽  
Xin Zhao ◽  
Yi Fu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Bearing Capacity ◽  
Axial Load ◽  
Load Capacity ◽  
Element Model ◽  
Steel Tube ◽  
Element Analysis ◽  
Composite Columns ◽  
Steel Ratio

Based on experimental research, the bearing performance of the new column (steel tube-reinforced concrete composite columns combination strengthened with angle steel and CFRP) has been studied in detail by finite element method. A finite element model is established based on a series of assumption. The load-displacement curves are obtained. The influence of steel ratio and thickness of CFRP layers to the bearing capacity is analyzed too. The result shows that both the steel ratio and the thickness of CFRP layers have great contribution to the axial load capacity. The finite element analysis results and theoretical analysis which are in good agreement show that simulation results are generally right.

scholarly journals NEURINGER-ROSEINWEIG MODEL BASED LONGITUDINALLY ROUGH POROUS CIRCULAR STEPPED PLATES IN THE EXISTENCE OF COUPLE STRESS

2020 ◽  
Vol 60 (3) ◽  
pp. 259-267
Author(s):  
Yoginibahen Devendrasinh Vashi ◽  
Rakesh Manilal Patel ◽  
Gunamani Biswanath Deheri
Keyword(s):  
Bearing Capacity ◽  
Couple Stress ◽  
Load Capacity ◽  
Continuum Theory ◽  
Type Equation ◽  
Stress Effect ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Closed Form Solutions ◽  
The Impact

This study intents to scrutinize the impact of ferrofluid in the presence of couple stress for longitudinally rough porous circular stepped plates. The influence of longitudinal surface roughness is developed using the stochastic model of Christensen and Tonder for nonzero mean, variance and skewness. Neuringer-Roseinweig model is adopted for the influence of ferrofluid. The couple stress effect is characterized by Stoke’s micro continuum theory. The modified Reynolds’ type equation is stochastically averaged and solved by no-slip boundary conditions. The closed form solutions for load bearing capacity and film pressure are obtained as a function of different parameters and plotted graphically. It is perceived that the load capacity gets elevated owing to the combined influence of magnetization and couple stress when the proper choice of roughness parameters (negatively skewed, standard deviation) is in place. Porosity and roughness (positively skewed) adversely affect bearing’s performance. The graphical and tabular analysis shows that there is a significant growth in load bearing capacity compared to the conventional lubricant case.

Bearing Capacity Calculating of GFRP Tube Filled with Steel-Reinforced Concrete Composite Column Subjected to Eccentric Loading

2010 ◽  
Vol 163-167 ◽  
pp. 191-195
Author(s):  
Bai Ling Chen ◽  
Lian Guang Wang ◽  
Guo Peng Qin
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Limit Equilibrium ◽  
Bending Rigidity ◽  
Composite Column ◽  
Composite Columns ◽  
Steel Reinforced Concrete ◽  
Steel Bar ◽  
Tensile Zone ◽  
Positive Effect

GFRP tube filled with steel-reinforced concrete composite column, GSRC, is a new kind of composite column, in which the (shaped steel) reinforcing steel bar is set and the concrete is poured into GFRP tube. Under the action of eccentric loading, the damage signs of the composite columns with smaller and larger eccentricity were respectively that GFRP tube of compressive zone was crushed and the fiber of GFRP tube of tensional zone was ruptured. The tight hoop effect of the concrete given by GFRP tube only existed in compressive zone, and the restriction to the concrete of tensile zone was unobvious. The shaped steel inside GFRP tube had a positive effect on the bending rigidity and the bearing capacity of the member. Using the limit equilibrium theory, the calculation formula of the bearing capacity of GSRC subjected to eccentric loading was created. The calculated results agreed well with the experimental ones.

scholarly journals STUDY ON COMPRESSIVE BEARING CAPACITY OF CONCRETE-FILLED SQUARE STEEL TUBE COLUMN REINFORCED BY CIRCULAR STEEL TUBE INSIDE

2013 ◽  
Vol 19 (6) ◽  
pp. 787-795 ◽  
Author(s):  
Yufen Zhang ◽  
Junhai Zhao ◽  
Weifeng Yuan
Keyword(s):  
Bearing Capacity ◽  
Load Capacity ◽  
Compressive Loading ◽  
Steel Tube ◽  
Ultimate Load Capacity ◽  
Unified Strength Theory ◽  
Composite Column ◽  
Circular Steel Tube ◽  
Optimal Section ◽  
Square Steel Tube

This paper concentrates on the compressive bearing capacity of one composite column of a Concrete-Filled Square Steel Tube (CFSST) reinforced by a circular steel tube inside. Some tests were conducted to consider the compression behaviour of the stub columns under axial compressive loading. Through an elastoplastic limit analysis based on Unified Strength Theory (UST), the ultimate load capacity of the CFSST columns reinforced by inner circular steel tube under axial compression has been derived, which has a good agreement with the experimental results in comparison with other empirical models. So this model is extended to predict the optimal design of the inner tube, namely, Di/ti and Di/B. In addition, another simple model is also proposed to testify the optimal section of this composite column. With the optimal circular steel tubes inside the CFSST column, the composite column can result in significant savings in column size, which ultimately can lead to significant economic savings and higher bearing capacity. The results show that it has a theoretical significance and application value to adopt circular steel tube to strengthen CFSST column.

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.

Research on Rolling-Sliding Integrated Auxiliary Bearing and its Application in High Temperature Reactor

2017 ◽  
Author(s):  
Chen Jianqiang ◽  
Sun Zhe ◽  
Yang Guojun ◽  
Liu Xingnan ◽  
Shi Zhengang
Keyword(s):  
High Temperature ◽  
High Speed ◽  
Hot Spot ◽  
Load Capacity ◽  
Magnetic Bearing ◽  
Displacement Curve ◽  
Rolling Bearings ◽  
Auxiliary Bearing ◽  
The Impact ◽  
High Temperature Gas

The active magnetic bearings (AMB), with the advantages of no friction, no abrasion, no lubrication and active control, is used in the primary helium circulator for high-temperature gas-cooled reactor (HTR). But the magnetic bearing is a complex system, which contains sensor, controller, power amplifier circuit and actuators. Any part of failure is likely to make high-speed rotor off balanced position and fell in the inner ring of the bearing, causing huge impact and fiction heat that may damage the magnetic bearing. Therefore, it is necessary to bring the auxiliary bearing in the magnetic bearing to protect and temporarily support the high-speed rotor. The auxiliary bearings are mainly divided into two categories: rolling bearings and plain bearings. Generally speaking, for rolling bearings, the force of friction is smaller and the heat caused by it is lower during the touchdown. However, it needs to be detected online to ensure that it can work well in emergencies, and the rolling bearings has a smaller load capacity because of the point contact between the ball and the ring. Compared with the rolling bearings, the structure of plain bearings is simple and durable. With a larger load capacity and the advantage of non-contact detection, the plain bearing is gradually becoming a research hot-spot in the field of the auxiliary bearing. But the great friction and inevitable heat are also cannot be ignored. In High temperature gas-cooled reactor demonstration power station (HTR_PM), the work load of helium main fan is very large, once the support of electromagnetic bearing is out of work, the auxiliary bearing need to suffer from a very large drop impact load, which is accompanied by a huge friction fever. Therefore, it is important to develop a rolling-sliding integrated bearing which can bear heavy load and have little friction, combined with the advantages of plain bearings and rolling bearings. And that is an important direction of the development for the main helium pan in high temperature gas-cooled reactor nuclear power plant. This paper establish a simulation model for a horizontal rotor and rolling-sliding integrated auxiliary bearing system. In the case of synchronous rotation of the inner ring with the rotor, the speed of the outer race of the bearing is determined. and based on the main helium fan in HTR-PM, using the finite element analysis software LS-Dyna, the rolling-sliding integrated auxiliary bearing is proposed and the impact force and the MISES stress nephogram when the peak inflation occurred during the first impact and the axial axes displacement curve during rotor drop in the auxiliary bearing are preliminarily simulated in this paper., then certain theoretical reference is provided for the design and engineering application of the rolling-sliding integrated auxiliary bearing.

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