scholarly journals Mechanical Performance of Simple Supported Concrete Beam-Cable Composite Element with External Prestress

2018 ◽  
Author(s):  
Teng Wang ◽  
Yanmei Ding ◽  
Wangchun Zhang ◽  
Yu Song
Keyword(s):  
Concrete Beam ◽  
Mechanical Performance ◽  
Composite Element

scholarly journals Mechanical Performance Evaluation of Concrete Beams Strengthened with Carbon Fiber Materials

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Jun Ding ◽  
Xia Huang ◽  
Gang Zhu ◽  
Song Chen ◽  
Guochao Wang
Keyword(s):  
Carbon Fiber ◽  
Crack Propagation ◽  
Crack Resistance ◽  
Main Crack ◽  
Concrete Beam ◽  
Mechanical Performance ◽  
Concrete Beams ◽  
Loading Capacity ◽  
Externally Bonded ◽  
Fiber Materials

As a kind of novel material of high strength and light weight, carbon fiber materials have been widely used in construction industry to repair the damaged bridges improving its mechanical performance. In this work, the reinforced plates made of carbon fiber materials (for short CFRP) are externally bonded to the bottom of concrete beams to enhance load capacity of beams. The strain energy release rates are calculated at the interest crack in concrete beams based on virtual crack closure technology using FEM and are chosen as the criterion to determine whether the mechanical properties of beams are strengthened by being externally bonded with CFRP. The effects of main crack propagation on plain concrete beam, on concrete beam strengthened with CFRP, and on inclined crack are also discussed. The comparison between the beams with and without CFRP shows that the CFRP significantly increases the loading capacity and crack resistance. It also shows that the main crack propagation can reduce loading capacity and crack resistance regardless of strengthening. The experiment observation also supports this. It proves the validity of the method, and it is concluded that in order to increase the loading capacity and crack resistance effectively, controlling over the crack propagation is necessary.

Experimental Study on Mechanical Performance of Unbonded and Bonded Prestressed Concrete Beams

2012 ◽  
Vol 178-181 ◽  
pp. 2387-2392
Author(s):  
Jian Su ◽  
Nan Gai Yi ◽  
Zong Guang Sun ◽  
Yang Bai ◽  
Ai Guo Zhang
Keyword(s):  
Prestressed Concrete ◽  
Concrete Beam ◽  
Mechanical Performance ◽  
Concrete Beams ◽  
Stress And Strain ◽  
Strain Variation ◽  
Yield Strain ◽  
Prestressed Concrete Beam ◽  
Bearing Load ◽  
Prestressed Reinforcement

The experiment which based on the stress performance of unbonded and bonded prestressed concrete beam, has made a systematically research on the stress and strain variation law of pretressing tendon in the aforementioned reinforcement prestressed concrete structure. When the bonded prestressed concrete beam bearing load, there is a larger variation in stress and strain of prestressing reinforcement along the length. The maxima of stress and strain of prestressing reinforcement in bonded prestressed concrete beam appears in midspan, it is achieved the yield stress and yield strain, the minima appears in bearing, the stress and strain of prestressing reinforcement in bonded prestressed concrete beam is proportional to the distortion. The stress and strain of prestressed reinforcement in unbonded prestressed concrete beam is almost the same along the length.

Experimental Research on Mechanical Performance of Self-Compacting Reinforced Concrete Beam with Recycled Coarse Aggregates

2011 ◽  
Vol 374-377 ◽  
pp. 1887-1890 ◽  
Author(s):  
Jing Li ◽  
Xian Feng Qu ◽  
Hai Yang Chen ◽  
Juan Li ◽  
Lin Jiang
Keyword(s):  
Reinforced Concrete ◽  
Concrete Beam ◽  
Bending Strength ◽  
Mechanical Performance ◽  
Testing Machine ◽  
Reinforced Concrete Beam ◽  
Recycled Concrete ◽  
The Self ◽  
Reinforced Concrete Beams ◽  
Coarse Aggregates

In order to study the mechanical performance of self-compacting reinforced concrete beam with recycled coarse aggregates, recycled concrete and recycled gravel were taken as coarse aggregates with the particle size from 50 to150mm, two groups of specimen of self-compacting reinforced concrete beams with recycled coarse aggregates were made. After seven days, their bending strength were tested using method of one-third point loaded of simple beam on the testing machine. The results showed that the recycled coarse aggregates are bonded closely with the self-compacting concrete, its bond performance is good; Compared to ordinary reinforced concrete beam, it shows a smaller stiffness and a bigger mid-span deflection. In addition, the different combination of recycled concrete could reduce the self-compacting reinforced concrete’s stiffness with recycled coarse aggregate and increase its deflection.

scholarly journals RELATIONSHIPS BETWEEN DEFORMATIONS AND STRESSES AT CONTACT ZONE OF FLAT-STRESSED COMPOSITE ELEMENT, WHICH WAS SUBJECTED CORROSION DAMAGES

2017 ◽  
Vol 13 (3) ◽  
pp. 58-69 ◽  
Author(s):  
Vitaly I. Kolchunov ◽  
Maria S. Gubanova
Keyword(s):  
Reinforced Concrete ◽  
Contact Zone ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Computational Results ◽  
Concrete Element ◽  
Composite Element ◽  
Flexibility Matrix ◽  
Composite Section

 A computational model of deformation of a flat-stressed reinforced-concrete composite element in the contact zone is proposed. Deformation equations takes the form of the relationships between the final increments  of stresses and deformations for a corrosion-damaged reinforced concrete element with intersecting cracks. Coefficients of flexibility matrix of the element are obtained. These coefficients take into account the long-term deformation,  corrosion damages and concentrated shear, when intersecting cracks appear in the contact zone of the composite element. The solution to reinforced-concrete beam of composite section is given. The computational results are compared with the experimental data for such structures.

Research on Mechanical Properties of Reinforced Concrete (RC) Beams for the Corrosion by Sea Water

2014 ◽  
Vol 507 ◽  
pp. 317-321
Author(s):  
Xia Zhou ◽  
Xi Kang Yan
Keyword(s):  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Concrete Beam ◽  
Mechanical Performance ◽  
Sea Water ◽  
Vertical Section ◽  
Reinforced Concrete Beam ◽  
Rc Beams ◽  
Normal Section ◽  
Initial Strength

By way of the soaking and drying cycle test on the different mix proportions vertical section of 10 pieces of RC beams suffered artificial sea water (ASW) corrosion under0,35,70,105,140 times of dry-wet cycles, the compared result of exerting pressure test of these beams under simply supporting were investigated. The law about the changes of the mechanical performance for RC beams with different mix proportions under different time periods for suffering corrosion of dry-wet cycles was as follows: The resistibility to ASW corrosion for the concrete specimens with various water cement ratio (various initial strength) are different;The characters of normal section failure for RC beams attacked by sea water are about the same as that for ordinary RC beam; Along with the extension of the time for seawater attack, the bearing capacity for normal section of RC beams varies wave upon wave. The specimens attacked by seawater for about 35 times of corrosion cycle achieve minimum bearing capacity. KEYWORDS: reinforced concrete beam; sea water corrosion; bearing capacity;

Experiment on the Bending Performance of Sea Sand Concrete Beam under the Artificial Climate Environment

2011 ◽  
Vol 217-218 ◽  
pp. 1380-1384
Author(s):  
Heng Lin Lv ◽  
Ya Lin Song ◽  
Yan Li
Keyword(s):  
Indoor Environment ◽  
Concrete Beam ◽  
Mechanical Performance ◽  
Great Influence ◽  
Chloride Ion ◽  
Climate Conditions ◽  
Bending Performance ◽  
Sea Sand ◽  
Desalination Technology ◽  
Load Deflection Curve

Through the experiment on the durability of sea sand concrete beam which is subject to climate conditions and indoor environment, the change of deflection, beam load-deflection curve, ductility and crack are studied. The results show: concrete beams that are mixed with sea sand are deteriorated by the chloride ion and their load-deflection curves as well as stiffness and ductility are reduced in different degree. But other beams that are mixed with desalinated sea sand are reduced not obviously. Otherwise, because of the bad environment accelerating degradation of the component mechanical performance and the sea sand desalination technology increasing the ability to resist environmental erosion, the component mechanical performance and the sea sand desalination technology take great influence to the component mechanical performance.

Finite Element Analysis of the Corrosion Prestressed Concrete Beam

2012 ◽  
Vol 204-208 ◽  
pp. 3040-3043
Author(s):  
Hong Bo Zou ◽  
Xiao Yong Luo
Keyword(s):  
Finite Element ◽  
Corrosion Rate ◽  
Prestressed Concrete ◽  
Concrete Beam ◽  
Mechanical Performance ◽  
Load Capacity ◽  
Element Model ◽  
Ultimate Load Capacity ◽  
Element Analysis ◽  
Prestressed Concrete Beam

Based on analysis of the Corrosion prestressed concrete beam with finite element model, the paper presents the mechanical performance of concrete beams in different corrosion rates. When the corrosion rate is less than 5%, the strand corrosion has little impact on the load capacity. With the increase of the corrosion rate more than 5%, what damage happened to Beam is little steel damage and brittle damage even without apparent warning and at the same time the Corrosion of steel strand will cause the decrease of the ultimate load capacity with the deterioration of ductility.

The Mechanical Performance of Carbon Fibres- Addressing the Role of Microstructure

2019 ◽  
Author(s):  
Peter Peter ◽  
Claudia Creighton ◽  
David Fox ◽  
Pablo Mota Santiago ◽  
Adrian Hawley ◽  
...  
Keyword(s):  
Mechanical Performance ◽  
Carbon Fibres
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