Determining the bearing capacity of reinforced plastics during irregular heating

1973 ◽  
Vol 5 (5) ◽  
pp. 587-591
Author(s):  
V. S. Dzyuba ◽  
V. V. Vengzhen
Keyword(s):  
Bearing Capacity ◽  
Reinforced Plastics

Strengthening of Reinforced Concrete Beams by Carbon Fiber Composites

2018 ◽  
Vol 931 ◽  
pp. 379-384
Author(s):  
Yuri V. Ivanov ◽  
Yuri F. Rogatnev ◽  
Igor I. Ushakov
Keyword(s):  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Bearing Capacity ◽  
Concrete Beams ◽  
Reinforced Concrete Beams ◽  
Carbon Fiber Composites ◽  
Limiting State ◽  
Reinforced Plastics ◽  
Reinforced Beams ◽  
The Given

The paper considers the results of the experimental study of the reinforced concrete beams strengthened by carbon fiber reinforced plastics (the CFRP). Eight reinforced concrete beams of the 80x160 mm section and 1500 mm designed span have been manufactured and tested. The influence of the number of the CFRP layers (strengthening power) on bearing capacity and rigidity under the static loading of beams in the thirds of the span has been studied. The results obtained indicate the increase in bearing capacity of the reinforced beams from 24% up to 55% and the increase in rigidity by 45% for the commonly adopted limiting state, i.e. achieving ultimate deformations in concrete of the compressed zone). The paper underlines the need for using anchor devices in the form of U-shaped binders to ensure the efficiency of the given method of strengthening.

Experimental Studies on Transfer Beam Supported Frame Equipped with Fiber Reinforced Plastics Bars

2013 ◽  
Vol 717 ◽  
pp. 277-282
Author(s):  
Jin Chen ◽  
Shi Yong Jiang ◽  
Zhi Kun Lin ◽  
Ying Tao Li ◽  
Xiang Rong Zeng ◽  
...  
Keyword(s):  
Bearing Capacity ◽  
Seismic Performance ◽  
Experimental Studies ◽  
Failure Pattern ◽  
Hysteresis Curve ◽  
Fiber Reinforced ◽  
Static Test ◽  
Reinforced Plastics ◽  
Fracture Development ◽  
Fiber Reinforced Plastics

Through pseudo static test on three pieces of fiber reinforced plastics (FRP) transfer beam supported frame with three different reinforcement form, reinforcement ratio and the number of root reinforcement ,which are subjected to the vertical load and horizontal low cycle reciprocating load, the specimen fracture development law, yield mechanism, failure pattern, and bearing capacity, ductility, hysteresis characteristics and seismic performance are analyzed. The test results show that: yield mechanism and failure pattern of transfer beam supported frame equipped with fiber reinforced plastics reinforced bars are reasonable. The bearing capacity and deformation performance of transfer beam supported frame with top and bottom longitudinal bar replaced by FRP bars and symmetrical reinforced box are better than that of single upper replacement for FRP and lower replacement for FRP. The ductility performance of transfer beam supported frame equipped with fiber reinforced plastics bars is good, hysteresis curve is full, and have good seismic performance.

The Study on Timber Pier Columns Strengthened with Cfrp Hoops in Ancient Architecture

2016 ◽  
Vol 25 (6) ◽  
pp. 096369351602500
Author(s):  
X Y Xiong ◽  
X X Lu ◽  
R J Xue
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibre ◽  
Bearing Capacity ◽  
Theoretical Foundation ◽  
Timber Structure ◽  
Reinforced Plastics ◽  
Universal Formula ◽  
Chinese Architecture ◽  
Carbon Fibre Reinforced Plastics

Timber structure is the mainstream method of ancient Chinese architecture. However due to the effect of weathering and long history, it was badly damaged. Therefore, the protective repairing is imminent. The traditional reinforcement method of pier columns strengthened with iron sheet presents unsatisfactory performance in recovering the bearing capacity, and the study on Carbon Fibre Reinforced Plastics (CFRP) material applying in strengthening pier column is relatively lacking. This paper studied the mechanical properties of 20 timber columns, 17 of which used the CFRP for reinforcement, and one specimen is strengthened with iron sheet. With the maximum bearing capacity of reinforcement columns with CFRP recovering up to 103.22%, the research proves reasonable arrangement of CFRP hoops and suitable strengthening quantity of CFRP could get commendable reinforcement results. Finally, considering the effect of the pier type on the bearing capacity of pier columns, this paper puts forward a more accurate and universal formula compared to Su model, which provides theoretical foundation for restoration projects of ancient architecture.

Experimental study on axial compression buckling of glass fiber reinforced plastics solid pole with circular cross-section

2022 ◽  
pp. 136943322110542
Author(s):  
Jianhui Si ◽  
Shixiong Qiu ◽  
Shuyang Feng ◽  
Jiebin Chen ◽  
Zhenshan Wang
Keyword(s):  
Bearing Capacity ◽  
Glass Fiber ◽  
Axial Compression ◽  
Slenderness Ratio ◽  
Circular Cross Section ◽  
Resin Matrix ◽  
Fiber Reinforced ◽  
Reinforced Plastics ◽  
Glass Fiber Reinforced ◽  
Fiber Reinforced Plastics

Glass fiber reinforced plastics are widely used in civil engineering because of their advantages such as light weight, high strength, good pollution resistance, and corrosion resistance. This study investigated the buckling bearing capacity, failure characteristics, and slenderness ratios of GFRP solid bars with circular cross-sections subjected to axial compression. A total of 18 specimens were categorized into six groups. The slenderness ratios ranged from 57 to 123. It was found from experiments that the instability mode of the specimens was extreme point instability, and a bearing capacity platform phenomenon was observed when overall lateral instability occurred. The failure mode was axial and transverse tearing failure of the material in the middle of the specimen. During buckling, the tensile side was transformed from the compression of the resin matrix to tension in the fibers. The elastic modulus of glass fiber was much lower than that of the resin matrix. After tension occurred, increased deformation led to a rapid increase in lateral bending, which resulted in the phenomenon of the bearing platform. At ultimate deformation, brittle failure of the specimen occurred. The buckling load of the specimen decreased sharply with an increase in the slenderness ratio, and stress ratios decreased from 34.95% to 6.73%. It is suggested that the slenderness ratio not exceed 80. Finally, based on experimental results, a practical method for calculating the stable bearing capacity of solid GFRP poles is proposed.

Experimental Study on Properties of Different Angles of FRP Shear Reinforced Timber Beams

2013 ◽  
Vol 860-863 ◽  
pp. 1310-1315
Author(s):  
Shi Hai Dong ◽  
Jiang Feng Dong ◽  
Q.Y. Wang
Keyword(s):  
Bearing Capacity ◽  
Failure Mode ◽  
Failure Process ◽  
Utilization Efficiency ◽  
Application Range ◽  
Reinforced Plastics ◽  
Frp Reinforcement ◽  
Shear Performance ◽  
Beam Bending ◽  
Timber Beams

Study of fiber reinforced plastics (i.e. CFRP, BFRP and AFRP) for rectangular beams reinforcement effect, using the FRP were 90o vertically and 45o slantingly parceled 10 rectangular timber beams shear performance, recorded specimen failure process. This paper analyzes the different FRP reinforcement plies, different reinforcement on beam properties of specimen, failure mode, bearing capacity, load-deflection relationship and strain distribution. The results showed that: FRP changed beams brittle failure mode, improve the beam bending, shear performance, ultimate bearing capacity increased by 28.2%~55.1%, the stiffness of the specimen and also improved ductility. In addition, its more effective to paste the FRP sheets vertically than slantingly with the angle of 45°. Using FRP strengthening beams the performance of the method is effective, the method can significantly improve the performance of wood. To improve the utilization efficiency of wood, expand the application range of timber provides useful reference.

Finite Element Analysis and Bearing Capacity Research of the New GFRP Strengthening Frame Members Based Modified Behavior

2012 ◽  
Vol 517 ◽  
pp. 915-918
Author(s):  
Yi Gao ◽  
Zhuo Bin Wei ◽  
Jing Huang
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Unsaturated Polyester ◽  
Fe Model ◽  
Element Analysis ◽  
Reinforced Plastics ◽  
Finite Element Software ◽  
Glass Fiber Reinforced ◽  
Frp Strengthening ◽  
Bearing Behavior

Based on the research of the new kind of glass fiber reinforced plastics based modified unsaturated polyester (MUPR-FRP). This paper presents the result of the numerical evaluation of bearing behavior of the MUPR-FRP strengthening frame members. The MUPR-FRP strengthening members were modeled using the nonlinear finite element software ANSYS and the load deflection behavior and ultimate capacity were evaluated numerically. For the FE model, members were modeled using Tsai-Wu with tension cut-off failure criterion. The numerical results and the bearing capacity research indicated that the stress of new MUPR-FRP strengthening frame members was less than the load bearing strength and the deformation could satisfy some requirements in use.

scholarly journals Ultimate Bearing Capacity Analysis of CFRP-Strengthened Shield Segments Using Bonding Slip Behavior Experiments

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4200
Author(s):  
Hong-bin Nie ◽  
Shuan-cheng Gu
Keyword(s):  
Bearing Capacity ◽  
Bending Strength ◽  
Ambient Pressure ◽  
Ultimate Bearing Capacity ◽  
Compression Tests ◽  
Confined Compression ◽  
Layer System ◽  
Reinforced Plastics ◽  
Bonding Performance ◽  
Hygrothermal Environment

Shield segments of subway tunnels are often exposed to the combined actions of several hygrothermal factors that could lead to accidents such as water seepage and tunnel collapse. Further, they often break and deform owing to formation pressure. In addition, uncertainties related to the stress relaxation characteristics and bonding performance of carbon-fiber-reinforced plastics (CFRPs) under a hygrothermal environment make their application in subway systems difficult. This study analyzes the effects of the slip-on-bending strength of CFRP-strengthened shield segments in a hygrothermal environment. In the study, the shield segments are damaged at ambient pressure under a combination of humidity (0%, 5%, and 10%) and temperature (20 °C, 25 °C, 30 °C, and 40 °C). An experimental procedure is designed to evaluate a CFRP-reinforced concrete arch. The method predicts the load–slip relationship and maximum shearing stress and strain. Moreover, confined compression tests are conducted on a tunnel segment lining strengthened with CFRP to evaluate the bearing capacity of the CFRP-strengthened shield segments. An equation for the latter’s ultimate bearing capacity is developed based on the elastic layer system theory, stress boundary condition, and bending stress characteristics of axisymmetric elements. It was found that the results from the developed model are compared with the experimental values of CFRP-strengthened shield segments under different humidity values (0%, 5%, and 10%) and a constant temperature. The ultimate strength—the debonding deflection of the CFRP-strengthened shield segment—can be predicted using the proposed ultimate bearing capacity equation with sufficient accuracy.

scholarly journals Experimental and Statistical Analysis of Formwork Beams Reinforced with CFRP

2019 ◽  
Author(s):  
Krisztián Andor ◽  
András Lengyel ◽  
Rudolf Polgár ◽  
Tamás Fodor ◽  
Zsolt Karácsonyi
Keyword(s):  
Statistical Analysis ◽  
Bearing Capacity ◽  
Failure Modes ◽  
Reference Sample ◽  
Construction Materials ◽  
Structural Behaviour ◽  
Load Bearing Capacity ◽  
Simultaneous Formation ◽  
Load Bearing ◽  
Reinforced Plastics

Enhancement of structural behaviour of various construction materials using fibre reinforced plastics (FRP) is an important branch of engineering research, including the increasing application for structural timber as well. This study deals with the reinforcement of standard construction formwork timber beams with carbon fibre reinforced plastics (CFRP). Beams with various amount of reinforcement were prepared using simultaneous formation of lamella and bonding. Laboratory bending tests are carried out and load-deflection data were measured to experimentally determine the change of load-bearing capacity and stiffness with respect to non-reinforced reference sample, as well as to assess the structural behaviour. Evaluation of failure modes is carried out on each specimen. A statistical analysis of the experimental results using t-test is also made. The experiments prove the enhancement of structural behaviour, especially in terms of the increased load-bearing capacity, the increased ductility in certain cases, the decrease of the scattering of results, and also in failure modes.

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