scholarly journals Experimental investigations on concrete beams reinforced with equivalent service steel pipe

2021 ◽  
Vol 30 (1) ◽  
pp. 16-28
Author(s):  
Labeeb Al-Yassri ◽  
Alaa Al-Khekani ◽  
Munaf Al-Ramahee
Keyword(s):  
Promising Result ◽  
Reference Beam ◽  
Steel Pipe ◽  
Experimental Investigations ◽  
Main Concern ◽  
Hollow Section ◽  
Steel Pipes ◽  
Multistory Building ◽  
Equivalent Reinforcement ◽  
Cracking Pattern

Different techniques were employed for the passage of different utilities through structural elements. The reduction of the overall building weight was the main concern that needs to be achieved, especially for a multistory building. It can be done with the eliminating of a suspended ceiling with a portion of the beam’s weight by taking the advantages of the hollow sections. In this study, an equivalent reinforcement to the traditional ribbed reinforcement was employed to fabricate a reinforced concrete (RC) beam with a hollow section along the length of the beam. A steel pipe was used based on the equivalent moment from section analysis. Two diameters were selected of steel pipes as an equivalent to the commercial reinforcement. A total of four RC beams were cast and tested, two of them with traditional reinforcement and the other with steel pipe reinforcement. The comparison showed a promising result in terms of ductility, cracking pattern, ultimate strength, and mode of failure compared to the reference beam. The peak loads for the specimens with steel pipe were 160.6 kN and 184 kN, while they were 192 kN and 203.5 kN for the beams with traditional reinforcement.

EXPERIMENTAL STUDY ON USE OF FALL PREVENTION MEMBERS IN WALL AND COLUMN DEMOLITION

2021 ◽  
Vol 8 (1) ◽  
Author(s):  
Seiji Takanashi ◽  
Hiroki Takahashi ◽  
Tomohito Hori
Keyword(s):  
Experimental Study ◽  
Fall Prevention ◽  
Urban Areas ◽  
Steel Pipe ◽  
Small Scale ◽  
Bottom Part ◽  
Steel Pipes ◽  
Wire Ropes ◽  
Heavy Machinery ◽  
Measured Load

At demolition sites in Japan, columns and walls are pulled down and demolished by heavy machinery or wire ropes. In a small-scale building in urban areas, columns and walls are pulled down by wire ropes. Before pulling down, workers damage the bottom part of the columns and walls for weakening them. However, if the damage of the columns and walls are too much, they fall down before use of wire ropes. As a result, they may crush workers. In this study, a fall prevention material was proposed with its installation method and verified its effectiveness by experiments. In an experiment of this study, steel pipes for supporting 3m-column were examined. The steel pipes were installed diagonally to the column. The column was loaded horizontally. We measured load and deformation until the steel pipe failed. As a result of experiments, it was found that the steel pipe buckled or the bolt supporting the steel pipe damaged. We concluded that this method is effective because the steel pipes were found to be sufficiently strong against the load generated in the steel pipes when the columns fell.

scholarly journals Flexural strengthening of RC beams with NSM CFRP laminates

2020 ◽  
Vol 323 ◽  
pp. 01010
Author(s):  
Damian Szczech ◽  
Łukasz Krawczyk ◽  
Renata Kotynia
Keyword(s):  
Reference Beam ◽  
Concrete Cover ◽  
Reinforced Concrete Beams ◽  
Rc Beams ◽  
Near Surface ◽  
Flexural Strengthening ◽  
Cfrp Laminates ◽  
Carbon Fibre Reinforced Polymer ◽  
Bottom Side ◽  
Cracking Pattern

The paper presents test results of reinforced concrete beams flexurally strengthened with Carbon Fibre Reinforced Polymer (CFRP) laminates using the Near Surface Mounted (NSM) technique. RC beams with a cross section of 200 x 400 mm were tested in four-point bending. Two RC beams were strengthened with one NSM CFRP laminate installed into the concrete cover on the bottom side of the beam. One of the beams was strengthened under the self-weight (B10.1) and the second one under initial preloading equal to 83% of the ultimate load of the reference beam (B10.1o). Failure mechanisms, cracking pattern and flexural behaviour of the beams are described in the paper. All the strengthened beams failed by rupture of the CFRP laminates followed by the internal steel reinforcement yielding. High strengthening efficiency of the NSM strengthening was confirmed by 109% and 130% when compared with the non-strengthened beam, respectively for beams B10.1 and B10.1o.

A Real-Time and On-Line Visual System for Seamless Steel Pipe Linearity Measurement

2005 ◽  
Vol 295-296 ◽  
pp. 393-398
Author(s):  
C.J. Liu ◽  
Xue You Yang ◽  
Ji Gui Zhu ◽  
S.H. Ye
Keyword(s):  
Coordinate System ◽  
Real Time ◽  
Local Coordinate System ◽  
Steel Pipe ◽  
Sensor Calibration ◽  
Steel Pipes ◽  
Global Calibration ◽  
On Line ◽  
Linearity Error ◽  
Seamless Steel

Linearity is a very important parameter for seamless steel pipes. A real-time and on-line visual measurement system for seamless steel pipe linearity is presented. The system consists of several structured-light visual sensors. Each sensor can achieve the coordinate of the center of partial steel pipe in its local coordinate system. Through global calibration, all coordinates measured can be transformed into an integrated coordinate system. The linearity error of steel pipe can be assessed. This method can fulfill 100% on-line and real-time linearity measurement. A pair structure-light sensor is designed to improve accuracy and a suspension-wires method for sensor calibration and global calibration is used. Through experiments, it shows that the method not only meets the need of precise calibration but also significantly improves the efficiency and feasibility.

scholarly journals Shear Strengthening of R.C Beams with FRP Using (NSM) Technique

2019 ◽  
pp. 1-20
Author(s):  
Ahmed H. Abdel-Kareem ◽  
Ahmed S. Debaiky ◽  
Mohamed H. Makhlouf ◽  
M. Abdel-Baset
Keyword(s):  
Glass Fiber ◽  
Reference Beam ◽  
Reinforced Concrete Beams ◽  
Fiber Reinforced Polymers ◽  
Experimental Program ◽  
Experimental Investigations ◽  
Fiber Reinforced ◽  
Near Surface ◽  
Glass Fiber Reinforced ◽  
Nsm Technique

This paper presents the experimental results of investigations the shear behavior of strengthened reinforced concrete beams by using glass fiber reinforced polymers (GFRP) rods. The strengthening system used GFRP rods were done by Near Surface Mounted technique (NSM), NSM technique contains a groove on the outside surface of the concrete member to adjust the depth to be less than the cover of the member. After cleaning, the epoxy paste was used to fill half of the groove's depth. The particular FRP element is then mounted in the groove. Finally, the groove is filled with epoxy and the too much epoxy is leveled with the outside surface of the concrete. This method enables the fiber reinforcement polymer FRP materials is covered completely by epoxy. The main objective of this research is to study the effect of NSM technique on shear resistance for RC beam. The parameters are considered in this study are effect of the material type used for strengthening (inner steel stirrups and external glass fiber stirrups), effect of FRP rods inclination on strengthened beams, shape with different end anchorage of FRP (strips and rods), and the effect of number of the used FRP rods. This paper involved 13 experimental investigations of half-scale R.C beams. The experimental program included two specimens strengthened with inner steel stirrups, eight specimens strengthened with stirrups of Glass Fiber Reinforced Polymer GFRP rods with the shape of different end anchorage and angle, and two specimens strengthened with externally bonded GFRP strips. The remaining un-strengthened specimen was assigned as a control one for comparison. The test results included ultimate capacity load, deflection, cracking, and mode of failure. All beams strengthened with GFRP rods showed an increase in the capacity ranging between 14% to 85% comparing to the reference beam, and beams strengthened with GFRP strips showed an increase in the capacity ranging between 7% to 22% comparing to the reference beam.

Burst Limit State Reliability for Fiber-Wrapped Steel Pipe

2010 ◽  
Author(s):  
Markus R. Dann ◽  
Marc A. Maes ◽  
Mamdouh M. Salama
Keyword(s):  
Large Strain ◽  
Limit State ◽  
Elastic Fiber ◽  
High Strength Steels ◽  
High Strength ◽  
State Model ◽  
Steel Pipe ◽  
Cauchy Stress ◽  
Steel Pipes ◽  
Steel Technology

Dry fiber augmented steel technology pipelines (FAST-Pipe™) have recently been the object of considerable attention due to both cost and availability advantages (as opposed to high strength steels) and due to their promising use in future Arctic pipeline solutions. The present paper focuses on the development and the use of a burst limit state for such fiber wrapped pipes. It describes in detail a probabilistic mechanical burst limit state model for FAST. The model is based on a large strain Cauchy stress formulation using Stewart’s isotropic strain hardening for steel pipe which is hoop-constrained by elastic fiber wrapping. The limit state model is used for a reliability comparison between FAST-Pipes and traditional pure steel pipes as well as for a risk-based equivalence between different design solutions.

Key Technology of Automatic Ultrasonic Testing System for Corkscrewed Steel Pipes

2011 ◽  
Vol 291-294 ◽  
pp. 2893-2897
Author(s):  
Yi Hua Kang ◽  
Jun Tu ◽  
Jian Bo Wu ◽  
Yan Hua Sun
Keyword(s):  
Ultrasonic Testing ◽  
High Speed ◽  
Steel Pipe ◽  
Inspection System ◽  
Testing System ◽  
Technical Data ◽  
Key Technology ◽  
Steel Pipes ◽  
The World ◽  
Increasing Demand

According to the increasing demand for the steel pipe in the world nowadays, as an effective method, ultrasonic testing plays a very important role in quality controlling procedures. Compared to the mature technology of the world, the domestic one still has some technical difficulties in high-speed probe rotating mode. This paper proposes an approach of combination of multi-probe arrays based on the internal detection way to solve the difficulty of coarse pitch. The structure of the inspection system is described with the workflow laying out. The practicability and reliability of the system is verified by means of a mass of experiments. The numeric automatic ultrasonic testing system has been successfully used and the technical data is given out at last.

Study on Frost-Resistant Experiments of Concrete for High Speed Railway Pile Foundation Protection

2010 ◽  
Vol 150-151 ◽  
pp. 603-607
Author(s):  
Fu Hai Li ◽  
Yue Zhong Ye ◽  
Yan Ke Yang
Keyword(s):  
High Speed ◽  
Steel Pipe ◽  
Frost Heave ◽  
Railway Bridge ◽  
High Speed Railway ◽  
Steel Pipes ◽  
Concrete Piles ◽  
Bridge Steel ◽  
Better Than ◽  
Durability Of Concrete

. In order to protect cast-in place piles of high speed railway bridge, steel pipes which used to be used during the work progress are left forever to increase the durability of concrete piles. The relative experiments are carried out indoor. On one hand, steel pipe can separate the concrete from exterior environment; on the other hand, under the condition of freezing, steel pipe can produce hoop effect to the concrete which can reduce crack expansion stress because of frost heave. Mass loss, relative dynamic modulus of elasticity and strength about steel pipe concrete are studied. The conclusion shows that the durability of concrete piles with steel pipe protection is much better than common concrete piles with no protection.

scholarly journals A Study on Axial Compression Performance of Large Diameter-Thickness Ratio Concrete-Filled Gas Drainage Steel Pipe

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Zi-Lu Liu ◽  
Zhan-Guo Ma ◽  
Ye Li ◽  
Peng Gong ◽  
Ke-Long Li ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Axial Compression ◽  
Ultimate Load ◽  
Peak Load ◽  
Steel Pipe ◽  
Load Bearing Capacity ◽  
Gas Drainage ◽  
Steel Pipes ◽  
Drainage Pipe ◽  
Second Peak

A large number of gas drainage pipes are obsoleted in the coal mine gas drainage system, and it causes serious waste. If concrete is poured into the discarded gas drainage pipes as components for underground roadway support, it is very significant for sustainable development of mine. Therefore, it is necessary to study the mechanical properties of the concrete-filled gas drainage steel pipe. Most frequently used gas drainage pipes are spiral welded steel pipe (SSP-I) and spiral external rib steel pipe (SSP-II). In this study, three different concrete-filled steel pipes are taken as the research object: SSP-I concrete-filled steel pipes, SSP-II concrete-filled steel pipes, and RSP concrete-filled ordinary round steel pipes. Through the axial compression test, the failure mode and relationship between stress-strain of concrete-filled steel pipes were obtained. Subsequently, the ultimate bearing capacity of three types of specimens was calculated based on the unified strength theory, limit equilibrium theory, and superposition theory. The test results show that both the SSP-I concrete-filled pipe columns and RSP concrete-filled pipe have good post-peak load-bearing capacity and ductility, and the second peak load reaches 70.38% and 81.92% of the ultimate load, respectively. The load-bearing capacity of SSP-II concrete-filled pipe columns is dropped sharply after bearing ultimate load, and the second peak load reaches only 36.47% of the ultimate load. The failure characteristics of concrete-filled gas drainage pipe columns show that the core concrete is compressed to powder and explain that the gas drainage pipe has fully exerted its restraint on the concrete. The FE method was used to simulate the compression test of three types of concrete-filled steel pipes, and the numerical simulation results show good agreement with the experimental results. Theoretical calculations show that the calculation of concrete-filled gas drainage pipe columns based on the superposition theory EC4-2004 is the closest to the measured value. Therefore, the EC4-2004 standard is recommended to calculate the ultimate bearing capacity of concrete-filled gas drainage pipe columns.

scholarly journals Experimental Study of Replacement the Tension Reinforcing Bars in Concrete Beams by Steel Pipes

2018 ◽  
Vol 7 (4.20) ◽  
pp. 229
Author(s):  
Labeeb Saadoon Al-Yassri ◽  
Alaa Mahdi Al-Khekany ◽  
Hajer Satea Abbas
Keyword(s):  
Reinforced Concrete ◽  
Construction Projects ◽  
Concrete Beams ◽  
Small Diameter ◽  
Reinforced Concrete Beams ◽  
Steel Pipe ◽  
Steel Pipes ◽  
Steel Bar ◽  
Steel Bars ◽  
The Difference

Structures designed with reinforced concrete beams are used extensively in construction projects because of their functional and economic features. In this research, tested concrete beams were cast and reinforced with small diameter steel pipes and /or steel bars as flexural reinforcement to study the effect of this configuration of reinforcement on the structural behavior of reinforced concrete beams. The idea of this research involves performing and testing of four reinforced concrete beams reinforced by small diameter steel pipes with different percentages of replacement with traditional steel bars (0%, 33%, 66% and 100%). The experimental results showed that using of steel pipes reduces the flexural capacity by (2.7, 18.3, 37.5%) if compared with traditional steel bar according to the replacement percentages of (33%, 66%, and 100%) respectively. Moreover, the stiffness of beams reinforced with steel pipes (fully or partially) decreased as a result of the difference in the mechanical properties between steel bar and the steel pipe and also, the bond strength reduction between the smooth steel pipe and surrounded concrete.  

Analysis of Ultimate Bearing Capacity and Parameters of Steel Support Cutting Pipe Roofing Structure

2021 ◽  
pp. 036119812110597
Author(s):  
Bo Lu ◽  
Wen Zhao ◽  
Xi Du ◽  
Shengang Li ◽  
Yongping Guan ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Failure Mode ◽  
Wall Thickness ◽  
Pipe Wall ◽  
Ultimate Bearing Capacity ◽  
Steel Pipe ◽  
Pipe Wall Thickness ◽  
Steel Pipes ◽  
Construction Design ◽  
Roof Structure

A new pipe-roof construction method, the steel support cutting pipe method (SSCP), was proposed to improve the construction security and accuracy of pipe jacking as well as underground space usage. The pipe-roof method is one of the underground excavation methods which push multiple steel pipes into the soil, then connect the steel pipes horizontally to form a whole. The proposed structure’s failure mode and force characteristics were determined through theoretical analysis, and then its ultimate bearing capacity and influencing parameters were analyzed through laboratory experiments and numerical simulation. The research results show that the structure’s bearing capacity depends on the steel pipe’s buckling load; the structure’s failure mode is a result of the steel pipe’s buckling. The ultimate bearing capacity of the pipe-roof structure first increases and then decreases with the increase of the steel pipe chord height ratio. The ultimate bearing capacity reaches the maximum when the ratio is 0.33. In addition, the structure’s ultimate bearing capacity is positively related to the steel pipe wall thickness and the pipe section’s length. This can be obtained from the relationship curve showing that the steel pipe wall thickness should be selected according to the engineering requirements and that the pipe section’s length is preferably 2.3 times the diameter of the steel pipe in the construction design.

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