scholarly journals A comparative experimental investigation of reinforced-concrete pipes under three-edge-bearing test: Spigot and Pocket and Ogee Joint pipes

2018 ◽  
Vol 40 (1) ◽  
pp. 30860 ◽  
Author(s):  
Jefferson Lins da Silva ◽  
Mounir Khalil El Debs ◽  
Marcela Novischi Kataoka
Keyword(s):  
Experimental Investigation ◽  
Reinforced Concrete ◽  
Circular Ring ◽  
Experimental Results ◽  
Concrete Pipes ◽  
Nominal Diameter ◽  
Comparative Experimental Investigation ◽  
Experimental Analyses

 An experiment on the behavior of two types of circular reinforced concrete pipes under three-edge-bearing test is analyzed and discussed. Current study compares the strength of spigot-pocket (SPP) and ogee joint pipes (OJP). In the experimental analyses thirty-two pipes, nominal diameter 800 and 1200 mm, divided into two series of 16 pipes each, were tested. Each series was composed of 12 spigot-pocket pipes (SPP) and 4 ogee joint pipes (OJP). Experimental results of the loading versus displacement curves indicated that pipes behave similarly to a circular ring, since the OJP presented maximum loads 12 and 4% higher than those obtained for SPP respectively for nominal diameters 800 and 1200 mm. Pocket influenced load cracking, with 6.4 and 33% higher for SPP when compared to OJP for nominal diameters 800 and 1200 mm, respectively. Further, the presence of the pocket increased the pipe´s stiffness. 

scholarly journals Experimental Investigation of an Existing RCP Rehabilitated with a Grouted Corrugated Steel Pipe

2019 ◽  
Vol 2019 ◽  
pp. 1-13
Author(s):  
Bai-jian Li ◽  
Liang-sheng Zhu ◽  
Yong Li ◽  
Xin-sha Fu
Keyword(s):  
Experimental Investigation ◽  
Reinforced Concrete ◽  
Carrying Capacity ◽  
Load Sharing ◽  
Steel Pipe ◽  
Load Carrying Capacity ◽  
Pipe System ◽  
Concrete Pipes ◽  
System A ◽  
Load Carrying

Although slip-lining is the most common rehabilitation technique, few research studies have been conducted on the behavior of rehabilitated reinforced concrete pipes (RCPs). Experiments were conducted on a RCP rehabilitated with a grouted corrugated steel pipe (CSP). The RCP rehabilitated by the CSP showed an increase in both load-carrying capacity and stiffness. The grout played an important role in distributing the loads when the RCP was deteriorated, whereas the load shared by the CSP represented only a small part. When the CSP was closely fitted to the RCP at the invert, the load was shared between the PCP and CSP and the CSP carried most of the load when the RCP was fully deteriorated. The slip-lined pipe acted as a “pipe within a pipe” system. A load-sharing theory was proposed in this study and provides estimates of the load-carrying capacity of the slip-lined pipes.

Experimental Investigation of Reinforced Concrete Columns with Steel Embedded Tubes

2021 ◽  
Vol 878 ◽  
pp. 134-143
Author(s):  
Mohammed H. Hameed ◽  
Ali Hussein Ali Al-Ahmed ◽  
Zena K. Abbas
Keyword(s):  
Experimental Investigation ◽  
Reinforced Concrete ◽  
Cross Section ◽  
Concrete Columns ◽  
Experimental Results ◽  
Experimental Program ◽  
Test Results ◽  
Steel Tubes ◽  
Eccentric Load ◽  
Rc Columns

This study aimed to investigate the influence of longitudinal steel embedded tubes located at the center of the column cross-section on the behavior of reinforced concrete (RC) columns. The experimental program consisted of 8 testing pin-ended square sectional columns of 150×150 mm, having a total height of 1400 mm, subjected to eccentric load. The considered variables were the steel square tube sizes of 25, 51 and 68 mm side dimensions and the load eccentricity (50 and 150) mm. RC columns were concealed steel tubes with hollow ratios of 3%, 12% and 20% depending on tube sizes used. The experimental results indicated an improvement in the overall behavior of eccentric columns when steel embedded tubes are used. The maximum gain in strength was about 59% for the hollow ratio of 20% with e/h=1. The test results show that the inserted steel pipe improves strength, ductility and enables these columns to absorb more energy than a similar solid column.

Experimental Investigation of Large Eccentrically Compressed Reinforced Concrete Column Consolidated with FRP Sheets

2011 ◽  
Vol 94-96 ◽  
pp. 1309-1312
Author(s):  
Guang Ling Guo
Keyword(s):  
Experimental Investigation ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Columns ◽  
Experimental Results ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Before And After ◽  
Calculation Results ◽  
Fiber Sheet

According to the experiment of 11 eccentrically compressed reinforced concrete columns and 1 comparative column under the monotonic loading, the bearing capacity，ductility，and the destruction mode of the columns before and after their consolidation have been compared and analyzed．The experimental results illustrates that external coherence of FRP could effectively enhance their bearing capacity and the improvements have relation to many aspects, such as the number of fiber layers, the category of fiber, approaches of how fiber sheet paste, the width of FRP and consolidation space and so on; the ductility of consolidation column mainly depends on how fabric pasted. Longitudinal pasting fiber sheets can greatly improve the bearing capacity of the column, but its ductility declined; the longitudinal-horizontal pasting fiber sheets can enhance column’s the bearing capacity and ductility and this brings about the best consolidation effects. Additionally, based on the analysis of experimental results, a formula for the bearing capacity of the normal section of the large eccentric loading reinforced concrete column consolidated with FRP sheets has been proposed, and the calculation results tally with the experimental results.

Effects of Scatter in Axial Bolt Force on the Sealing Performance of Pipe Flange Connections at Elevated Temperature

2009 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Yuya Omiya ◽  
Yoshio Takagi ◽  
Hiroyasu Torii
Keyword(s):  
Elevated Temperature ◽  
Experimental Results ◽  
Strain Gauges ◽  
Controlled Assembly ◽  
Force Condition ◽  
Flange Connection ◽  
Nominal Diameter ◽  
Sealing Performance ◽  
Significant Difference ◽  
Experimental Analyses

Since scatter in axial bolt force exists in assembling pipe flange connections, it is important to evaluate the effect of scatter in axial bolt force on the sealing performance of pipe flange connection. The FE and experimental analyses were done to evaluate the effect of scatter in axial bolt force on the sealing performance of pipe flange connections with 3″ (NPS 3″) and 20″ (NPS 20″) nominal diameters. The axial bolt force was measured with strain gauges mounted on the shank of each bolt. The two kinds of torque controlled assembly procedures, ASME PCC-1 procedure and JIS 2251 procedure, were evaluated as an assembling procedure and compared the scatter in axial bolt force with that of the uniform axial bolt force condition. The results revealed that the significant difference was not observed between ASME PCC-1 and JIS 2251 procedures. The scatter in axial bolt force were not changed at elevated temperature, however, the axial bolt force increased when increasing the temperature. Therefore, the tightness of the flanged connection is improved with increasing the temperature up to 200 °C. The assembly efficiency was evaluated with the experimental results of 20″ nominal diameter leakage tests and FE analyses. In addition to the scatter in the assembly axial bolt force, the flange rotation affected the axial bolt force when internally pressurized. As a result, the tightness parameter, Tp, was slightly lower than that evaluated with the assembly efficiency, η = 0.85, defined in ASME PCC-1 procedure. The results are discussed and a modified assembly efficiency is proposed.

Analysis of Thermal Expansion in Face-Cutting Operations

1974 ◽  
Vol 96 (4) ◽  
pp. 1222-1229 ◽  
Author(s):  
R. Ichimiya ◽  
Y. Usuzaka
Keyword(s):  
Experimental Investigation ◽  
Thermal Expansion ◽  
Theoretical Investigation ◽  
Experimental Results ◽  
Temperature Distributions ◽  
Center Point ◽  
Circular Surface ◽  
Experimental Analyses

Theoretical and experimental analyses are developed for the thermal expansion of a tool and a cylindrical work during face-cutting with a lathe. Theoretical investigation considers temperature distributions in the tool and the work at the cutting position, and these temperature distributions relate to the elongations of the work and the tool. The experimental investigation was conducted on a lathe turning at the end face of a solid cylindrical work. The results of sample calculations for thermal expansion coincide significantly with the experimental results. When the end face of the work is machined from the center point to the circular surface, the end face deforms to become convex; when it is machined from the circular surface to the center point, the end face deforms to become concave.

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