Study on Applicable Spans and Static Performance of the Suspension Bridges Using CFRP Cables

2011 ◽  
Vol 255-260 ◽  
pp. 1115-1119 ◽  
Author(s):  
Yang Jiang ◽  
Li Jun Jia
Keyword(s):  
Mass Density ◽  
High Strength ◽  
Suspension Bridge ◽  
Small Mass ◽  
Fiber Reinforced Polymer ◽  
Suspension Bridges ◽  
Main Cable ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Static Performance

Bridge constructions of crossing wider sea straits allow the span of suspension bridge to move forward unceasingly, but the self-weight stress of the traditional high-strength steel as the material of main cable accounts for the ratio of allowable stress will be increasing with the growth of main span.That will limit the main span and load-carrying efficiency.Due to its high tensile strength,small mass density,excellent corrosion and fatigue resistant ability,the carbon fiber reinforced polymer(CFRP) is the ideal material for the main cable of suspension bridge.In this paper, the feasibility of applying CFRP materials in the suspension bridges was proved and the applicable spans for the suspension bridges with CFRP cables were also provided.

Contrastive Analysis on Limitation Span between Suspension Bridge Using Steel and CFRP Cable

2012 ◽  
Vol 568 ◽  
pp. 57-60 ◽  
Author(s):  
Yang Jiang ◽  
Li Jun Jia
Keyword(s):  
Mass Density ◽  
High Strength ◽  
Suspension Bridge ◽  
Small Mass ◽  
Fiber Reinforced Polymer ◽  
Theoretical Formula ◽  
Main Cable ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
The Ideal

Bridge constructions of crossing wider sea straits allowed the span of suspension bridge to move forward unceasingly, but the self-weight stress of the traditional high-strength steel as the material of main cable accounted for the ratio of allowable stress would be increasing with the growth of main span. That would limit the main span and load-carrying efficiency. Due to its high tensile strength，small mass density，excellent corrosion and fatigue resistant ability, the carbon fiber reinforced polymer(CFRP) was the ideal material for the main cable of suspension bridge. In this paper the limitation spans of two suspension bridge systems were studied by the static analysis and the theoretical formula derived from the ultimate strength of the main cable.

Design Method of the Cable Saddle for CFRP Main Cable in Long-Span Suspension Bridge

2011 ◽  
Vol 243-249 ◽  
pp. 1557-1560 ◽  
Author(s):  
Hong Yu Zheng ◽  
Huai Yan Jiang ◽  
Zhi Tao Lu
Keyword(s):  
Design Method ◽  
High Strength ◽  
Suspension Bridge ◽  
Contact Forces ◽  
Fiber Reinforced Polymer ◽  
Maintenance Cost ◽  
Final State ◽  
Long Span ◽  
Main Cable ◽  
Reinforced Polymer

A non-corrosion, high strength, light weight material – carbon fiber reinforced polymer (CFRP) is introduced to replace steel as cable system in long-span suspension bridge for improving loading efficiency, reducing maintenance cost, enlarging the span of suspension bridge. Because of the transverse weakness of CFRP, traditional cable saddle is not suitable. The contact forces between main cable and cable saddle slot under final state are investigated with a simplified analytical method. According to the mechanical characteristics of CFRP and the formulas deduced, the design suggestion of cable saddle for CFRP main cable of long-span suspension bridge are proposed.

Applications of FRP Material in Bridge Structures

2013 ◽  
Vol 798-799 ◽  
pp. 249-252 ◽  
Author(s):  
Li Jun Jia ◽  
Yang Jiang
Keyword(s):  
High Performance ◽  
Mass Density ◽  
High Strength ◽  
Small Mass ◽  
Suspension Bridges ◽  
Steel Material ◽  
Reinforced Plastic ◽  
Bridge Structures ◽  
New Type ◽  
Corrosion Of Steel

For bridge structures using the traditional steel material, some problems are hard to solve, such as corrosion of steel bar and fatigue of steel deck. And the self-weight stress of the traditional high-strength steel as the material of cable stayed and suspension bridges will limit the main span and load-carrying. As a new type of high performance structural material, fiber reinforced plastic (FRP) has many advantages, such as small mass density, high tensile strength, excellent corrosion and fatigue resistant ability. Therefor in recent years, it has attracted much attention by the construction industry. In this paper, characteristics of FRP material are introduced and then applications of FRP material in bridge structures are discussed.

High strength expansive concrete-encased-steel filled carbon fiber reinforced polymer tubes under axial monotonic and cyclic load

2020 ◽  
Vol 54 (29) ◽  
pp. 4557-4573
Author(s):  
Qi Cao ◽  
Xianrui Lv ◽  
Xiaojun Li ◽  
Changjun Zhou ◽  
Shide Song
Keyword(s):  
Axial Strain ◽  
Peak Load ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Cross Sectional ◽  
Loading Mode ◽  
Expansive Concrete ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Sectional Shape

High-strength concrete-encased-steel filled CFRP (carbon fiber reinforced polymer) tube (HCSFC) takes advantages of high strength of concrete, steel and confinement of FRP, resulting in enhanced structural load carrying capacity and deformability. In this study, expansive high-strength concrete is filled between CFRP tube and sectional steel to study the mechanical properties of high-strength expansive concrete-encased-steel filled CFRP tube (HECSFC) under monotonic and cyclic axial compression. Twenty-four specimens were fabricated in this study. The variables included the number of CFRP layers (0, 1, 2 layers), cross-sectional shape (circular and square), self-stress level (with or without self-stress) and loading mode (monotonic and cyclic). Test results show that the peak load of HCSFC specimen is greater than their nominal load-carrying capacity, which indicates that CFRP plays a confinement role on the internal core concrete-encased-steel. As the number of layers increases, both the normalized peak load and the ultimate axial strain increase. For specimens under the same number of layers, cross sectional shape and loading mode, the ultimate axial strain and strain reduction factor of self-stressing specimens are higher than those of nonprestressed specimens. At the same time, it is found that the confinement efficiency of CFRP on circular specimen is higher than that of square specimen. Analytical results show that the modified existing stress-strain models of CFRP confined concrete predict well with the experimental results.

scholarly journals Shear Strength of Externally U-Bonded Carbon Fiber-Reinforced Polymer High-Strength Reinforced Concrete

Materials ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3659
Author(s):  
Basil Ibrahim ◽  
Moussa Leblouba ◽  
Salah Altoubat ◽  
Samer Barakat
Keyword(s):  
Reinforced Concrete ◽  
High Strength ◽  
Fiber Reinforced Polymer ◽  
Experimental Program ◽  
Fiber Reinforced ◽  
Premature Failure ◽  
Displacement Ductility ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Frp Strips

In this paper, we investigate the contribution of Fiber-Reinforced Polymer (FRP) to the load-carrying capacity of shear-strengthened Reinforced Concrete (RC) beams. Specifically, the investigation is focused on the FRP’s contribution in the presence and absence of shear stirrups. To this end, two sets of full-scale RC beam specimens were tested to failure in a simply supported setup. Set 1 consisted of specimens without shear stirrups whereas Set 2 included steel stirrups spaced at 170 mm. One and two layers of FRP discrete strips were bonded to the beams in a U-jacketing configuration. To investigate the contribution of FRP and its interaction with the stirrups, two different locations were considered when bonding the FRP strips: between the stirrups (referred to as Off-beams) and at the same level of the stirrups (referred to as On). Results of the experimental program showed that strengthening the beams with two layers of FRP does not necessarily translate to improved capacity. Furthermore, the location of FRP strips with respect to the location of shear stirrups has an influence on the beam’s overall behavior, especially its displacement ductility. This is an important parameter to consider to avoid premature failure of RC members. Test results were then used to assess the performance and accuracy of the predictions of ACI PRC-440.2-17 and fib-TG9.3. Both design codes were found to be conservative with an average prediction-to-test ratio of 0.7.

Analysis and Test on Mechanical Properties of a Flexible Suspension Bridge

2013 ◽  
Vol 405-408 ◽  
pp. 1616-1622
Author(s):  
Guo Hui Cao ◽  
Jia Xing Hu ◽  
Kai Zhang ◽  
Min He
Keyword(s):  
Mechanical Properties ◽  
Suspension Bridge ◽  
Experimental Results ◽  
Suspension Bridges ◽  
Loading Test ◽  
Main Cable ◽  
Element Simulation ◽  
Static Loading Test ◽  
Geometric Nonlinear Analysis ◽  
Test Process

In order to research on mechanical properties of flexible suspension bridges, a geometric nonlinear analysis method was used to simulate on the experimental results, and carried on static loading test finally. In the loading test process, the deformations were measured in critical section of the suspension bridge, and displacement values of measured are compared with simulation values of the finite element simulation. Meanwhile the deformations of the main cable sag are observed under classification loading, the results show that the main cable sag increment is basically linear relationship with the increment of mid-span loading and tension from 3L/8 and 5L/8 to L/2 section, the main cable that increasing unit sag required mid-span loads and tension are gradually reduce in near L/4 and 3L/4 sections and gradually increase in near L/8 and 7L/8 sections and almost equal in near L/2, 3L/8 and 5L/8 sections. From the experimental results, the flexible suspension bridge possess good mechanical properties.

HYDRAULIC BULGE TESTING TO COMPARE FORMABILITY OF CONTINUOUS AND STRETCH BROKEN CARBON FIBER PREPREG LAMINATES

2021 ◽  
Author(s):  
YONI SHCHEMELININ ◽  
JARED W. NELSON ◽  
ROBERTA AMENDOLA
Keyword(s):  
Carbon Fiber ◽  
High Strength ◽  
Biaxial Stress ◽  
Fiber Reinforced Polymer ◽  
Aviation Industry ◽  
Strain Behavior ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites ◽  
Bulge Testing ◽  
Hydraulic Bulge

The use of carbon fiber reinforced polymer composites has increased with the increased need for high-strength, low-density materials, particularly in the aviation industry. Stretch broken carbon fiber (SBCF) is a form of carbon fiber created by the randomized breaking of aligned fibers in a tow at inherent flaw points, resulting in a material constituted of collimated fiber fragments longer than chopped fibers. While continuous carbon fibers possess desirable material properties, the limited formability prevents their wider adoption. SBCF composites exhibit pseudo-plastic deformation that can potentially enable the use of traditional metal forming techniques like stamping and press forming well established in mass production applications. To investigate the formability of SBCF composites prepared with either continuous or stretch broken Hexcel IM-7 12K fiber, impregnated with Huntsman RDM 2019-053 resin, hydraulic bulge testing was performed to explore the strain behavior under biaxial stress conditions at elevated temperature under atmospheric pressure. Initial results show better formability of SBCF compared to continuous fiber, characterized by the axisymmetric response to the applied stress.

Experimental study on the axial compression performance of GFRP-reinforced concrete square columns

2018 ◽  
Vol 22 (7) ◽  
pp. 1554-1565 ◽  
Author(s):  
Jianwei Tu ◽  
Kui Gao ◽  
Lang He ◽  
Xinping Li
Keyword(s):  
Carrying Capacity ◽  
Ultimate Load ◽  
Fiber Reinforced Polymer ◽  
Load Carrying Capacity ◽  
Longitudinal Reinforcement ◽  
Rc Columns ◽  
Compression Performance ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Ultimate Load Carrying Capacity

At present, extensive studies have been conducted relative to the topic of fiber-reinforced polymer(FRP)- reinforced concrete (RC) flexural members, and many design methods have also been introduced. There have, however, been few studies conducted on the topic of FRP-RC compression members. In light of this, eight glass-fiber-reinforced polymer (GFRP)-RC square columns (200×200×600 mm) were tested in order to investigate their axial compression performance. These columns were reinforced with GFRP longitudinal reinforcement and confined GFRP stirrup. These experiments investigated the effects of the longitudinal reinforcement ratio, stirrup configuration (spirals versus hoops) and spacing on the load-carrying capacity and failure modes of GFRP-RC rectangular columns. The test results indicate that the load-carrying capacity of longitudinal GFRP bars accounted for 3%-7% of the ultimate load-carrying capacity of the columns. The ultimate load-carrying capacity of RC columns confined with GFRP spirals increased by 0.8%-1.6% with higher ductility, compared to GFRP hoops. Reducing the stirrup spacing may prevent the buckling failure of the longitudinal bars and increase the ductility and load-carrying capacity of the GFRP-RC columns. It has been found that setting the GFRP compressive strength to 35% of the GFRP maximum tensile strength yields a reasonable estimate of ultimate load-carrying capacity of GFRP-RC columns.

Structural Performance of Fiber-Reinforced Polymer Honeycomb Sandwich Panels: Evaluation of Size Effect and Wrap Strengthening

2003 ◽  
Vol 1845 (1) ◽  
pp. 191-199 ◽  
Author(s):  
Ondrej Kalny ◽  
Robert J. Peterman ◽  
Guillermo Ramirez ◽  
C. S. Cai ◽  
Dave Meggers
Keyword(s):  
Carrying Capacity ◽  
Ultimate Load ◽  
Sandwich Panels ◽  
Fiber Reinforced Polymer ◽  
Load Carrying Capacity ◽  
Flexural Capacity ◽  
Reinforced Polymer ◽  
Load Carrying ◽  
Honeycomb Sandwich ◽  
Ultimate Load Carrying Capacity

Stiffness and ultimate load-carrying capacities of glass fiber-reinforced polymer honeycomb sandwich panels used in bridge applications were evaluated. Eleven full-scale panels with cross-section depths ranging from 6 to 31.5 in. (152 to 800 mm) have been tested to date. The effect of width-to-depth ratio on unit stiffness was found to be insignificant for panels with a width-to-depth ratio between 1 and 5. The effect of this ratio on the ultimate flexural capacity is uncertain because of the erratic nature of core-face bond failures. A simple analytical formula for bending and shear stiffness, based on material properties and geometry of transformed sections, was found to predict service-load deflections within 15% accuracy. Although some factors influencing the ultimate load-carrying capacity were clearly identified in this study, a reliable analytical prediction of the ultimate flexural capacity was not attained. This is because failures occur in the bond material between the outer faces and core, and there are significant variations in bond properties at this point due to the wet lay-up process, even for theoretically identical specimens. The use of external wrap layers may be used to shift the ultimate point of failure from the bond (resin) material to the glass fibers. Wrap serves to strengthen the relatively weak core–face interface and is believed to bring more consistency in determining the ultimate load-carrying capacity.

scholarly journals Flexural strengthening of Reinforced Concrete (RC) Beams Retrofitted with Corrugated Glass Fiber Reinforced Polymer (GFRP) Laminates

2015 ◽  
Vol 2 (1) ◽  
Author(s):  
N. Aravind ◽  
Amiya K. Samanta ◽  
Dilip Kr. Singha Roy ◽  
Joseph V. Thanikal
Keyword(s):  
Reinforced Concrete ◽  
Carrying Capacity ◽  
Fiber Reinforced Polymer ◽  
Load Carrying Capacity ◽  
Rc Beams ◽  
Glass Fiber Reinforced Polymer ◽  
Flexural Strengthening ◽  
Reinforced Polymer ◽  
Glass Fiber Reinforced ◽  
Load Carrying

AbstractStrengthening the structural members of old buildings using advanced materials is a contemporary research in the field of repairs and rehabilitation. Many researchers used plain Glass Fiber Reinforced Polymer (GFRP) sheets for strengthening Reinforced Concrete (RC) beams. In this research work, rectangular corrugated GFRP laminates were used for strengthening RC beams to achieve higher flexural strength and load carrying capacity. Type and dimensions of corrugated profile were selected based on preliminary study using ANSYS software. A total of twenty one beams were tested to study the load carrying capacity of control specimens and beams strengthened with plain sheets and corrugated laminates using epoxy resin. This paper presents the experimental and theoretical study on flexural strengthening of Reinforced Concrete (RC) beams using corrugated GFRP laminates and the results are compared. Mathematical models were developed based on the experimental data and then the models were validated.

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