Research on Damage Characteristics about Reinforced Concrete Circular Pipe Culvert

2013 ◽  
Vol 477-478 ◽  
pp. 1002-1006
Author(s):  
Jun Zhang ◽  
Xie Dong Zhang
Keyword(s):  
Reinforced Concrete ◽  
Circular Pipe ◽  
Control Methods ◽  
Damage Characteristics ◽  
Concrete Pipe

The damages of reinforced concrete pipe culvert appeared in use process brought a lot of problems. Investigated the pipe culvert damage characteristics, analyzed the causes of damages from load, structure stress and production, give the corresponding control methods.

Damage Causes and Control about Reinforced Concrete Circular Pipe Culvert under the High Fill

2012 ◽  
Vol 256-259 ◽  
pp. 1082-1086
Author(s):  
Jun Zhang ◽  
Xie Dong Zhang ◽  
Xiang Yu Hu
Keyword(s):  
Reinforced Concrete ◽  
Circular Pipe ◽  
Control Methods ◽  
Damage Characteristics ◽  
Concrete Pipe ◽  
And Control

The damages of reinforced concrete pipe culvert appeared in use process brought a lot of problems. Investigated the pipe culvert damage characteristics, analyzed the causes of damages from load, structure stress and production, give the corresponding control methods.

scholarly journals Study on Damage Characteristics of Fiber Concrete under Acid Rain Erosion

2020 ◽  
Vol 198 ◽  
pp. 01010
Author(s):  
Duo Wu
Keyword(s):  
Reinforced Concrete ◽  
Acid Rain ◽  
Great Influence ◽  
Basalt Fiber ◽  
Corrosion Damage ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Damage Characteristics ◽  
Fiber Concrete ◽  
Rain Erosion

Concrete structure will be corroded under acid rain scouring and soaking for a long time, which has a great influence on its durability life. In order to further study the damage characteristics of fiber reinforced concrete under acid rain erosion, the formation mechanism of acid rain and its influence on the corrosion and deterioration of concrete and fiber materials were analyzed in this paper. Taking basalt fiber concrete as an example, the characteristics such as porosity, compressive strength and mechanical indexes were studied and analyzed. Moreover, the reasons for the optimal fiber content was briefly analyzed. The results show that the inner structure of basalt concrete mixed with 0.1% fiber was the most stable and the corrosion resistance was the most satisfying.This conclusion has certain reference significance for the corrosion damage research of fiber reinforced concrete.

Lap Weld Strength of Reinforced Concrete Pipe Cages

2017 ◽  
pp. 1-17
Author(s):  
George Hand ◽  
David Schnerch ◽  
Kimberly L. Spahn
Keyword(s):  
Reinforced Concrete ◽  
Weld Strength ◽  
Concrete Pipe

A new test method for evaluating the long-term performance of fiber-reinforced concrete pipes

2019 ◽  
Vol 23 (7) ◽  
pp. 1336-1349 ◽  
Author(s):  
Fouad T Al Rikabi ◽  
Shad M Sargand ◽  
Issam Khoury ◽  
John Kurdziel
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Steel Reinforcement ◽  
Fiber Reinforced Concrete ◽  
Synthetic Fiber ◽  
Concrete Pipes ◽  
Concrete Pipe ◽  
Long Term Performance ◽  
Term Performance

Synthetic fibers have been used recently to minimize the need for steel reinforcement in the concrete pipe to enhance their ductility. However, synthetic fiber has properties that may change over time due to its viscoelastic behavior. The objective of this study is to investigate the long-term performance of fiber-reinforced concrete pipes using a new test frame. A three-dimensional finite element model was created for the long-term testing frame to ensure its compliance with the American Society for Testing and Materials requirement. The finite element results showed that the testing frame successfully transferred the load to the concrete as the pipe cracked at the location where high flexural stresses are expected. Concrete pipe reinforced with synthetic fiber dosage of 9 kg/m3 along the steel reinforcement area of 5.7 cm2/m was tested to evaluate the concrete pipe system performance. The pipe was tested under two load stages for 120 days each. Load stages 1 and 2 included applying 40% and 70% of the ultimate load obtained by the authors in a previous study, respectively. The strain and deflection increased linearly within 5 days of applying the load and then leveled off. The pipe showed a slight increase in the crack width and deflection, indicating that fiber creep did not have a significant impact on the long-term performance of the concrete pipe. Also, it was observed that strain values surpassed those for plain concrete material, suggesting that including synthetic fiber in the concrete pipe mix enhanced the pipe ductility.

The Determination of Prestress for Reinforced Concrete Pipes Based on Elasticity

2011 ◽  
Vol 213 ◽  
pp. 510-514
Author(s):  
Rong He ◽  
Wei He ◽  
Heng Xiang Zheng
Keyword(s):  
Reinforced Concrete ◽  
Critical Conditions ◽  
Elastic Model ◽  
Concrete Pipes ◽  
Inner Pressure ◽  
Concrete Pipe ◽  
Stress Boundary Condition ◽  
Theory Result ◽  
Stress Boundary

Based on elasticity, an elastic model was used to derivate the stress function and the stress expressions. According to the stress boundary condition and the geometry dimension of a cylinder-cross-section pipe, the constants are determined. First supposed the pipe were empty and the inner pressure were zero, the maximum prestress for the reinforced concrete pipe was determinate. Second, supposed the liquid pressure was the maximum, the model was used to determinate the minimum prestress. Combined the two critical conditions, the reasonable range of prestress for reinforced concrete pipe was got. In designing, the prestress must be consistent with it to prevent the concrete from crushing or bursting. At last, some differences between the theory result and the fact were pointed out to guide the application of the model.

Centrifuge testing to simulate buried reinforced concrete pipe joints subjected to traffic loading

2015 ◽  
Vol 52 (11) ◽  
pp. 1762-1774 ◽  
Author(s):  
Boris Rakitin ◽  
Ming Xu
Keyword(s):  
Reinforced Concrete ◽  
Large Diameter ◽  
Traffic Load ◽  
Surface Loading ◽  
Traffic Loading ◽  
Centrifuge Testing ◽  
Geotechnical Centrifuge ◽  
State Highway ◽  
Concrete Pipe ◽  
The Right

Pipeline water leakage has become a serious problem in many countries. It has been widely noted that most of the damage to the pipelines occurs in the joints where two pipes are connected to each other. This paper presents the results of a geotechnical centrifuge testing program in which the response of a 12 m long (in prototype scale) large-diameter reinforced concrete pipeline with gasketed bell-and-spigot joints subjected to three standard American Association of State Highway and Transportation Officials design load configurations has been investigated. The results show that most vertical pipe movements occurred during the first 10 cycles of traffic loading. Under design tandem loading, the pipe joint displacements were significantly higher than those under the other two traffic load configurations. An increase of soil cover depth resulted in a reduced influence of surface loading, the effect of which was the most significant for two single pairs of wheels of design trucks in passing mode. Furthermore, two pipes on the left side and two pipes on the right side from the tested joint were influenced significantly by the surface loading, while the pipeline movements were not symmetrical. Although the joint directly under the load experienced the largest rotation, the possibility of leakage in the second joint in the spigot-to-bell direction was also high, due to large differential displacement between the pipes.

Full-scale physical testing of a buried reinforced concrete pipe under axle load

2014 ◽  
Vol 51 (4) ◽  
pp. 394-408 ◽  
Author(s):  
G.R. Lay ◽  
R.W.I. Brachman
Keyword(s):  
Reinforced Concrete ◽  
Soil Cover ◽  
Limit State ◽  
Structural Response ◽  
Bending Moment ◽  
Full Scale ◽  
Surface Load ◽  
Burial Depth ◽  
Concrete Pipe ◽  
Physical Testing

The structural response of a 600 mm inner diameter reinforced concrete pipe buried in a dense, well-graded sand and gravel soil and subjected to surface load from a single design truck axle with 0.3, 0.6, and 0.9 m of soil cover above the pipe crown is quantified using full-scale physical testing. The pipe did not crack at its minimum burial depth of 0.3 m under working CL-625 and CL-800 single-axle highway design loads as the largest tensile strains were only 50%–60% of those at the onset of cracking. Application of the fully factored CL-625 single-axle load at a burial depth of 0.3 m resulted in a tensile crack and a maximum circumferential bending moment of 6 kN·m/m; however, no limit state was reached as the crack width was around one-half the value used to define pipe serviceability and the maximum moment was around 70% of the theoretical ultimate capacity. The decrease in pipe demand from surface load with increasing soil cover is also quantified. At 400 kN of single-axle force, the crown moment decreased to 65% and 35% of the value at 0.3 m burial when the depth of soil cover was increased to 0.6 and 0.9 m, respectively.

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