Behavior of Reinforced Concrete Cylindrical Shells Subjected to External Hydrostatic Water Pressure

2016 ◽  
Vol 113 (5) ◽  
Author(s):  
Amr I. I. Helmy ◽  
Michael P. Collins
Keyword(s):  
Reinforced Concrete ◽  
Water Pressure ◽  
Cylindrical Shells

Simulation Analysis for Reinforced Concrete Aqueduct of Lijia Pumping Station

2014 ◽  
Vol 488-489 ◽  
pp. 605-608
Author(s):  
Xiang Zan Xie
Keyword(s):  
Reinforced Concrete ◽  
Simulation Analysis ◽  
Water Pressure ◽  
Water Diversion ◽  
Distribution Law ◽  
Masonry Arch ◽  
Pumping Station ◽  
Earthquake Effect ◽  
Concrete Masonry ◽  
Cushion Layer

Reinforced concrete masonry arch aqueduct is a common water diversion engineering structure. Aqueduct is decorated on the concrete cushion layer, cushion layer effects on masonry arch, the structures stress is uniform, carrying capacity is strong. This paper adopts finite element method to carry out force analysis for reinforced concrete masonry arch aqueduct of Lijia pumping station, considering aqueduct weight, water pressure and earthquake effect, etc. Researching stress and deformation distribution law of reinforced concrete masonry arch aqueduct.

Design and Impermeability of High Durability Reinforced Concrete Segment

2012 ◽  
Vol 174-177 ◽  
pp. 1199-1203
Author(s):  
Xin'gang Wang ◽  
Fang Bin Chen ◽  
Xu Na Ye ◽  
Wei Qin Zhang
Keyword(s):  
Diffusion Coefficient ◽  
Reinforced Concrete ◽  
Water Pressure ◽  
Chloride Ion ◽  
Concrete Cover ◽  
Chloride Diffusion ◽  
Shield Tunnel ◽  
Main Body ◽  
Chloride Diffusion Coefficient ◽  
High Durability

Reinforced concrete segment is the main body of structure in shield tunnel, and its durability has an important effect on shield tunnel. The durability of High Durability Reinforced Concrete Segment (abbr. HDRC Segment) was investigated by impermeability of single segment and chloride diffusion coefficient of core-drilling. HDRC Segment had high compact cover, concrete cover and high strength structural-layer. Permeable height of HDRC Segment was approximately 0.5 mm when Keeping 4 hours in the constant water pressure of 0.8 MPa, and chloride diffusion coefficient of HDRC Segment was only 4.9×10－13m2/s by NEL method. As for Water impermeability and chloride ion penetration resistance, HDRC Segment is far superior to those of conventional Reinforced Concrete Segment (abbr. conventional RC Segment). It is advantageous to increase durability of HDRC Segment and service life of tunnel engineering.

Vibrations of Circular Cylindrical Shells under External Water Pressure

1992 ◽  
Vol 206 (2) ◽  
pp. 79-86 ◽  
Author(s):  
C T F Ross ◽  
T Johns ◽  
R M Stanton
Keyword(s):  
Water Pressure ◽  
Cylindrical Shells ◽  
Shell Element ◽  
The Finite Element Method ◽  
Applied Water ◽  
Resonant Frequencies ◽  
External Water Pressure ◽  
Circular Cylindrical Shells ◽  
External Water ◽  
Surrounding Fluid

A theoretical and an experimental investigation was made on the vibration of three machined circular cylindrical shells under external water pressure. The theoretical investigation was based on the finite element method, where the shell was modelled by a truncated thin-walled conical shell element and the surrounding fluid by an annular element which had a cross-section in the form of an eight-node isoparametric quadrilateral. Comparison between theory and experiment was good and showed that the resonant frequencies decreased with an increase in the externally applied water pressure.

scholarly journals Experimental Study on the Permeation and Migration Rules of Pressurized Water in Textile-Reinforced Concrete (TRC)

Materials ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6512
Author(s):  
Boxin Wang ◽  
Jiaqi Liu ◽  
Qing Wang
Keyword(s):  
Reinforced Concrete ◽  
Water Pressure ◽  
Concrete Specimen ◽  
Textile Reinforced Concrete ◽  
Pressurized Water ◽  
Slit Flow ◽  
Concrete Permeability ◽  
External Water ◽  
And Migration ◽  
Experimental Values

As a new type of repairing and reinforcing material, textile-reinforced concrete (TRC) is often used to improve mechanical properties and durability of offshore, port, and hydraulic structures in the corrosive environment. In order to investigate how to quantify the permeability performance of TRC under external pressurized water, standard concrete permeability tests, nuclear magnetic resonance (NMR) tests, and scanning electron microscope (SEM) tests were conducted. These tests considered the effects of fiber grid size, Tex content, and water–cement ratio on the impermeability of TRC. Experimental results show that water gathers around the fiber bundles and migrates upwards along the longitudinal fiber under external water pressure and seeps out from the upper surface of the concrete specimen. Furthermore, based on the concentric annular slit flow theory and hydropower similarity principle, this study established a formula for the permeability of TRC and the calculated values are in good agreement with the experimental values.

Experimental Study on Electrical Conductivity of Carbon Fiber Reinforced Concrete Underwater

2012 ◽  
Vol 461 ◽  
pp. 246-249 ◽  
Author(s):  
You Zhi Wang ◽  
Yong Zhi Xu ◽  
Ying Sun
Keyword(s):  
Electrical Conductivity ◽  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Water Pressure ◽  
Fiber Reinforced Concrete ◽  
Fiber Reinforced ◽  
Defect Area ◽  
Electrode Method ◽  
Carbon Fiber Reinforced ◽  
External Water

This paper studied the effect of carbon fiber dosage, concrete age, size of defect, and eater pressure on the electrical conductivity of carbon fiber reinforced concrete (CFRC). Insulating films were buried in the concrete to simulate inside cracking. The carbon fiber was added as the conductive material of the concrete. The electrical conductivity was measured with a two-electrode method with a DC power. The test results show that concrete age, defect area and the external water pressure are the main factors influencing the electrical conductivity of CFRC, while the number and location of defects have less effect.

Nonlinear FEM Analysis of the Steel-Liner Reinforced Concrete Penstock Considering Softening Effect

2012 ◽  
Vol 212-213 ◽  
pp. 951-956
Author(s):  
Hai Lin Wu ◽  
Shi He Qin ◽  
Xiao Fan Du ◽  
Qun Li
Keyword(s):  
Reinforced Concrete ◽  
Water Pressure ◽  
Fem Analysis ◽  
Element Model ◽  
Nonlinear Fem ◽  
Softening Effect ◽  
Normal Water ◽  
Steel Liner ◽  
Safety Operation ◽  
The Finite Element Model

In combination with the practice of a hydropower station steel-liner reinforced concrete penstock, the finite element model is established to analyze bearing characteristics of the penstock. In the paper, cracking behaviors of the surrounding concrete as well as stresses of the steel liner and reinforcement under normal water pressure are intensively studied based on the model test. The results can provide the basis for the safety operation of the steel-liner reinforced concrete penstock.

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