Ultimate Strength of Parabolic Concrete Arches

2021 ◽  
Author(s):  
Adnan Al-kuaity ◽  
Keyword(s):  
Reinforced Concrete ◽  
Ultimate Strength ◽  
Analytical Procedure ◽  
Bending Moment ◽  
Steel Reinforcement ◽  
Collapse Mechanism ◽  
Test Results ◽  
Concentrated Load ◽  
Lightly Reinforced Concrete ◽  
Good Agreement

This investigation is aimed to present a simple analytical approach for predicting the ultimate strength of concrete arch using theory of plasticity. Six models of two-hinged parabolic concrete arches with and without steel reinforcement were tested under concentrated load. The observed behavior of cracking strength and collapse load of the arches tested were compared with those predicted by the analytical procedure proposed here. The arches tested were un-reinforced concrete, lightly reinforced concrete, and concrete with filing iron respectively. A Good agreement is found between the proposed analysis and test results. Tests have shown that the collapse of all arches was mainly due to the formation of two plastic hinges at a point of maximum bending moment which is similar to collapse mechanism adopted in this study. The use of light concentric steel reinforcement resulted into a significant increase in the ultimate load. This increase reaches up to three times of that without reinforcement. Ductility was also found to be greatly improved due to using steel reinforcement in arches. The procedure of analysis in this paper can give a simple guide for design of concrete arch.

Reinforced Concrete Moderate Deep Beams with Embedded PVC Pipes

2015 ◽  
Vol 3 (1) ◽  
pp. 19-29 ◽  
Author(s):  
Thaar Saud Salaman Al-Gasham
Keyword(s):  
Reinforced Concrete ◽  
Ultimate Strength ◽  
Beam Width ◽  
Test Results ◽  
Deep Beams ◽  
Limited Effect ◽  
Concentrated Load ◽  
Simply Supported ◽  
Test Parameters ◽  
Pvc Pipe

      The test results of six reinforced concrete moderate deep beams with embedded PVC pipes are reported. The tests studied the effect of installation of PVC pipe on behavior of reinforced concrete moderate deep beams. The test parameters were the diameters and locations of the pipes. The dimensions of beams were 1000 mm length, 150 mm width and 300mm depth. One beam was constructed without pipe as control and the remaining five had embedded pipes. Four pipe diameters were used: 25.4, 50.8, 76.2, and 101.6 mm and these pipes were inserted longitudinally either at the center of the beams or near the tension reinforcement. The beams were simply supported and tested under central concentrated load up to failure. The test results indicated that, the pipe diameter less than 1/3 of the beam width had limited effect on the capacity and rigidity of beam. For larger pipes, the ultimate strength of beams decreased between 16.7% and 33.3% and the beams stiffness decreased between 103% and 297%.

Buckling/Ultimate Strength Evaluation for Continuous Stiffened Panel Under Combined Shear and Thrust

2016 ◽  
Author(s):  
Hiroaki Ogawa ◽  
Tomoki Takami ◽  
Akira Tatsumi ◽  
Yoshiteru Tanaka ◽  
Shinichi Hirakawa ◽  
...  
Keyword(s):  
Ultimate Strength ◽  
Fem Analysis ◽  
Strength Analysis ◽  
Stiffened Panel ◽  
Fe Modeling ◽  
Test Results ◽  
Strength Evaluation ◽  
Shear Buckling ◽  
Collapse Behavior ◽  
Good Agreement

In this study, FE modeling method for the buckling/ultimate strength analysis of a continuous stiffened panel under combined shear and thrust is proposed. In order to validate the proposed method, shear buckling collapse tests of a stiffened panel and FEM analysis are carried out. As the result of these, it is confirmed that the buckling collapse behavior and the ultimate strength estimated by the proposed method are in good agreement with the test results.

scholarly journals The Assessment of Using CFRP to Enhance the Behavior of High Strength Reinforced Concrete Corbels

2021 ◽  
Vol 28 (1) ◽  
pp. 71-83
Author(s):  
Mazin Abdulrahman ◽  
Shakir Salih ◽  
Rusul Abduljabbar
Keyword(s):  
Reinforced Concrete ◽  
Ultimate Strength ◽  
Load Capacity ◽  
High Strength ◽  
Load Carrying Capacity ◽  
Test Results ◽  
Ultimate Load Capacity ◽  
Load Carrying ◽  
Externally Bonded ◽  
Effective Depth

In this research, an experimental study is conducted to investigate the behavior and strength of high strength reinforced concrete corbels externally bonded with CFRP fabric sheets and Plates with different patterns taking into account the effect of adopted variables in enhancing the ultimate strength; the effect of shear span to effective depth (a/d), configuration, type and amount of bonding. Eleven high strength reinforced corbels were cast and tested under vertical loads. Test results showed there was an improvement in the behavior and load carrying capacity of all strengthened corbels. An increasing in the ultimate strength of strengthened corbel by inclined CFRP strips reached to (92.1%) while the increasing reached to (84.21%) for using one horizontal CFRP Plates compared to un-strengthened reference specimen. Also, it can be conducted that the increase of (a/d) ratio from (0.6 to 0.8) resulted in decreasing by 21.05% in ultimate load capacity of corbels and from (0.4 to 0.6) by 31.25% and 58.69% in cracking and ultimate loads respectively Using CFRP .

Study on Seismic Behavior of Vertical Connection in Prefabricated Reinforced Concrete Structures

2011 ◽  
Vol 250-253 ◽  
pp. 1385-1394
Author(s):  
Guo Hua Song ◽  
Dong Wei Wang ◽  
Bing Kang Liu
Keyword(s):  
Reinforced Concrete ◽  
Seismic Behavior ◽  
Concrete Structures ◽  
Shear Resistance ◽  
Repeated Loading ◽  
Reinforced Concrete Structures ◽  
Test Results ◽  
Dowel Action ◽  
Cycle Loading ◽  
Good Agreement

The paper attempts to research the seismic behavior and mechanical mechanisms under repeated low-cycle loading of vertical connections in prefabricated reinforced concrete structures. Eighteen specimens were designed and tested, the test process and the mechanical mechanisms are studied, the seismic behavior of connections is analyzed, and the shear resistance formulas are proposed. The theoretical values based on proposed formulas are good agreement with test results. Under repeated loading, the shear resistance decreases, the connection ductility increases with connecting bar, but decreases with connection width. However, all the connections fail crisply with poor ductility. At sudden-cracking, the shear resistance increases with connecting bar, but changes nonlinearly with connection width. The resistance is composed of attributions of mechanism of diagonal-compressive column (MDCC) and mechanism of compressive friction action (MCFA). After sudden-cracking, the shear resistance is provided by weakened MDCC and dowel action of connecting bars (DACB). It increases with connecting bar and connection width.

Numerical Simulation on the Behaviors of Post-Embedded Bars in Reinforced Concrete

2012 ◽  
Vol 598 ◽  
pp. 454-458
Author(s):  
Jian Hua Yang
Keyword(s):  
Numerical Simulation ◽  
Reinforced Concrete ◽  
Slip Model ◽  
Test Results ◽  
One Dimensional ◽  
Pull Out ◽  
Interface Slip ◽  
Experimental Values ◽  
Anchor Design ◽  
Good Agreement

Prism pull-out test results was used to build anchorage bonding interface slip model(ABISM), with this model, the behaviors of post-embedded bars in reinforced concrete with different anchorage depth were analyzed by one-dimensional numerical method, and the calculation values was compared with the experimental values. The results showed that: the calculated value is in good agreement with the experimental values. this model can provides an important reference for anchor design.

scholarly journals Experimental Behavior of Concrete-Filled Steel Tubular Members Subjected to Lateral Loads

2018 ◽  
Vol 2018 ◽  
pp. 1-15 ◽  
Author(s):  
Chengzhi Wang ◽  
Xin Liu ◽  
Pengfei Li
Keyword(s):  
Experimental Study ◽  
Reinforced Concrete ◽  
Bending Moment ◽  
Steel Tube ◽  
Test Results ◽  
Lateral Loads ◽  
Reinforcing Bars ◽  
Concrete Pile ◽  
Steel Bars ◽  
Concrete Model

The findings of an experimental study that was undertaken to investigate the performance of concrete-filled steel tubular members subjected to lateral loads are reported in this study. Columns of pure concrete, concrete with reinforcing bars, and two steel tube thicknesses were considered. Two different tests were conducted in this study. One test is used to research the performance of steel tube-reinforced concrete model piles under a lateral loading. The other test is used to research the effect of the depth of rock embedment for piles embedded in a foundation to simulate actual engineering applications in an experimental study. According to these test results, a detailed analysis was carried out on the relationships, such as the stress-strain and load-displacement relationships for the specimen. These tests show that the steel tube thickness and steel bars will significantly enhance the lateral bearing capacity and rigidity of the composite components. Additionally, the ultimate bending moment formula of a steel tube-reinforced concrete pile is deduced. The comparison of the calculated results with the experimental results shows that this formula is applicable for this type of pile foundation.

Estimation of Ultimate Tendon Stress in Reinforced Concrete Beams Prestressed with External FRP Tendons

2013 ◽  
Vol 798-799 ◽  
pp. 374-377
Author(s):  
Shuan Jiang
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Concrete Beams ◽  
Plastic Hinge ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Test Results ◽  
Stress Increment ◽  
Hinge Zone ◽  
Good Agreement

The ultimate tendon stress is the key to calculation of flexural capacity in reinforced concrete beam prestressed with external FRP tendons (RCBPEFT). Based on the theory of equivalent plastic hinge zone, the general formulas for calculating the ultimate tendon stress increment and ultimate tendon stress in RCBPEFT are therefore proposed. Comparisons indicate that the predictions are in good agreement with the test results.

Research on Behavior of Composite Joints Consisting of Concrete and Steel

2012 ◽  
Vol 166-169 ◽  
pp. 815-818 ◽  
Author(s):  
Jin Jie Men ◽  
Zhi Feng Guo ◽  
Qing Xuan Shi
Keyword(s):  
Reinforced Concrete ◽  
Material Model ◽  
Element Model ◽  
Steel Tube ◽  
Steel Beam ◽  
Composite Joints ◽  
Test Results ◽  
Composite Joint ◽  
Element Type ◽  
Good Agreement

A 3-D finite element model (FEM) using ABAQUS was established to simulate the performance of the composite joints with reinforced concrete and steel. Accurate material model, element type, and solution method were discussed in the model. Some composite joints, concrete-filled steel tubular (CFST) column to steel beam, steel tube confined concrete (STCC) column to reinforced concrete (RC) beam and reinforced concrete (RC) column to steel beam were modeled based on the model, respectively. The results from FEM are good agreement with the test results. The mechanism of the composite joint was investigated based on the FEM.

Deflection Calculation on Reinforced Concrete Beams Strengthened by Externally Prestressing Transverse Tensioning Method

2013 ◽  
Vol 671-674 ◽  
pp. 430-436
Author(s):  
Jin Jun Liu ◽  
Tian Wen Wang
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beams ◽  
Large Error ◽  
Reinforced Concrete Beams ◽  
Secondary Effect ◽  
Test Results ◽  
Short Term ◽  
Secondary Load ◽  
Externally Prestressing ◽  
Good Agreement

Eight reinforced concrete beams (six externally reinforced and two contrast beams) were tested under primary or secondary load experiment. According to the test results, the existing specifications were applied to make calculations on short-term deflection which leaded to a large error. The secondary effect should be considered on calculating the deflection. Therefore, comparisons were made between the improved calculated value and test value on deflections of reinforced concrete beams strengthened by externally prestressed transverse tensioning method and they are in good agreement.

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