scholarly journals Monitoring of prestressed concrete pressure vessels. 1. An overview of concrete embedment strain instrumentation and calibration test results for selected concrete embedment strain meters

1978 ◽  
Author(s):  
D.J. Naus ◽  
C.C. Hurtt
Keyword(s):  
Prestressed Concrete ◽  
Pressure Vessels ◽  
Test Results ◽  
Calibration Test

ANALYSIS OF THE STANDPIPE ZONE OF PRESTRESSED CONCRETE PRESSURE VESSELS

PCI Journal ◽  
1969 ◽  
Vol 14 (3) ◽  
pp. 64-73
Author(s):  
J. Harrop
Keyword(s):  
Prestressed Concrete ◽  
Pressure Vessels

scholarly journals 5-Axis Force Calibration Test Results for the JAXA 60cm MSBS

2004 ◽  
Vol 52 (606) ◽  
pp. 309-315 ◽  
Author(s):  
Hideo Sawada ◽  
Tetsuya Kunimasu ◽  
Shinichi Suda ◽  
Yasushi Mizoguti ◽  
Takumi Okada
Keyword(s):  
Test Results ◽  
Calibration Test ◽  
Force Calibration

Effect of Concrete Release Strength on the Development Length and Flexural Capacity of Members Made With Different Prestressing Wires Commonly Used in Pretensioned Concrete Railroad Ties

2015 ◽  
Author(s):  
Amir Farid Momeni ◽  
Robert J. Peterman ◽  
B. Terry Beck ◽  
Chih-Hang John Wu ◽  
Naga Narendra B. Bodapati
Keyword(s):  
Compressive Strength ◽  
Prestressed Concrete ◽  
Loading Rate ◽  
Test Results ◽  
Development Length ◽  
Concrete Compressive Strength ◽  
Flexural Capacity ◽  
Pretensioned Concrete ◽  
Embedment Length ◽  
Bond Characteristics

A study was conducted to determine the effect of concrete release strength on the development length and flexural capacity of members utilizing five different 5.32-mm-diameter prestressing wires that are commonly used in the manufacture of prestressed concrete railroad ties worldwide. These included two chevron-indented wires with different indent depths, one spiral-indented wire, one dot-indented wire, and one smooth wire (with no surface indentation). A consistent concrete mixture was used for the manufacture of all test specimens, and the different release strengths were obtained by allowing the specimens to cure for different amounts of time prior to de-tensioning. Each prismatic specimen (prism) had a 3.5″ (88.9 mm) × 3.5″ (88.9 mm) square cross section with four wires arranged symmetrically. The prisms were identical except for the wire type and the compressive strength at the time of de-tensioning. All four wires were each initially tensioned to 7000 pounds (31.14 KN) and then de-tensioned gradually when the concrete compressive strength reached 3500 (24.13 MPa), 4500 (31.03 MPa) and 6000 (41.37 MPa) psi. Precise de-tensioning strengths were ensured by testing 4-in.-diameter (101.6 mm) × 8-in.-long (203.2 mm) compression strength cylinders that were temperature match-cured. The prisms were loaded in 3-point-bending to determine the ultimate bond characteristics of each reinforcement type for the different concrete release strengths. A loading rate of 300 lb/min (1334 N/min) was applied at mid-span and the maximum sustained moment was calculated for each test. Two 69-in.-long (175.26 cm) prisms, each having different concrete release strength, were tested with each of the 5 wire types. These prisms were tested at both ends, with a different embedment length assessed at each end. Thus, for each wire type and concrete release strength evaluated, a total of 4 tests were conducted for a total of 60 tests (5 wire types × 3 release strengths × 4 tested embedment lengths). Test results indicate that the concrete compressive strength at de-tensioning can have a direct impact on the ultimate flexural capacity of the members, and this has significant design implications for pretensioned concrete railroad ties. Results are discussed and recommendations made.

scholarly journals The behaviour of concrete in prestressed concrete pressure vessels

1972 ◽  
Vol 20 (2) ◽  
pp. 429-475 ◽  
Author(s):  
R.D. Browne ◽  
R. Blundell
Keyword(s):  
Prestressed Concrete ◽  
Pressure Vessels

Analysis and Experimental Verification of SCC Characteristics of Typical Chinese Steels for Pressure Vessels Under Wet H2S Environment

2006 ◽  
Author(s):  
Xuedong Chen ◽  
Jialing Jiang ◽  
Tiecheng Yang ◽  
Jiushao Hu ◽  
Zhibin Ai ◽  
...  
Keyword(s):  
Crack Propagation ◽  
Critical Concentration ◽  
Dynamic Control ◽  
Control Process ◽  
Critical Stress Intensity Factor ◽  
Pressure Vessels ◽  
Concentration Limit ◽  
Test Results ◽  
Hydrogen Induced Cracking ◽  
Chinese Standard

In this paper, the estimation expression of critical concentration for hydrogen-induced cracking and estimation expression of critical stress intensity factor KISCC for hydrogen-induced delayed brittle fracture of the three Chinese steels for pressure vessels — 16MnR, 15MnVR and 07MnCrMoVR in Chinese standard GB 6654 are derived first according to SCC mechanism and in combination with fracture mechanics techniques, and verified by comparison with test values. The estimation expressions of diffusion-dominated crack plateau growth rate da/dt of these three materials are derived using Gerberich model based on the analysis of dynamic control mechanism of hydrogen-induced crack propagation under wet H2S environment and the estimated values are verified with the test results for WOL specimens. And the effect of concentration limit and concentration of the medium at normal temperature on the dynamic control process of crack propagation is also discussed.

scholarly journals Concrete Creep Analysis Method Based on a Long-Term Test of Prestressed Concrete Beam

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Mingfang Yang ◽  
Song Jin ◽  
Jinxin Gong
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beam ◽  
Creep Model ◽  
Test Results ◽  
Analysis Method ◽  
Loading Test ◽  
Concrete Creep ◽  
Prestressed Concrete Beam ◽  
Creep Analysis

Concrete creep plays a significant role in the long-term performance of the prestressed concrete structure. However, most of the existing prediction models cannot accurately reflect the in-site concrete creep in a bridge construction environment. To improve the prediction accuracy of creep effects in concrete structures, an innovative creep analysis method is developed in this study. Parameters in the creep model in fib MC 2010 have been calibrated with respect to the long-term loading test results of the prestressed concrete beam. The measured strains of concrete and the midspan deflections of the test beam are compared with the predicted results using the creep model in fib MC 2010. It indicates that the results predicted by the calibrated creep model are in good agreement with the test results. However, the results predicted by the creep model in fib MC 2010 significantly deviate from the test results. This proposed creep analysis method can provide a new thought to improve the predicted effect of the creep effects on creep-sensitive structures.

Gas Liquid Vane Separators in High Pressure Applications

2010 ◽  
Author(s):  
Dani Fadda ◽  
David Barker
Keyword(s):  
Separation Efficiency ◽  
Pressure Vessels ◽  
Cfd Modeling ◽  
Test Results ◽  
Capacity Curves ◽  
Liquid Handling ◽  
Wide Range ◽  
Computational Fluid Dynamics Cfd ◽  
Very High ◽  
High Separation

Vane separators are inertial devices used to remove entrained liquids from gas. They are utilized in pressure vessels operating at a wide range of temperatures and pressures. Computational Fluid Dynamics (CFD) modeling and sizing calculations are used to evaluate the loading to a vane separator and determine the maximum overall gas and liquid handling capacity of the pressure vessel. Test results, performed at operating pressures up to 133 bar (1931 psia) using live natural gas illustrate that, when sized correctly based on the vane’s capacity curves and CFD modeling, vane separators continue to have high separation efficiency at very high operating pressures.

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