Modelling of strength and energy absorption capacity of hybrid fibre-reinforced concrete

2021 ◽  
pp. 1-10
Author(s):  
Christopher Chella Gifta ◽  
Ramesh Gopal
Keyword(s):  
Reinforced Concrete ◽  
Energy Absorption ◽  
Absorption Capacity ◽  
Fibre Reinforced Concrete ◽  
Energy Absorption Capacity ◽  
Hybrid Fibre

Evaluation of reinforced concrete and reinforced engineered cementitious composite (ECC) members and structures using small-scale testing

2015 ◽  
Vol 42 (3) ◽  
pp. 164-177 ◽  
Author(s):  
Bora Gencturk ◽  
Farshid Hosseini
Keyword(s):  
Reinforced Concrete ◽  
Energy Absorption ◽  
High Energy ◽  
Absorption Capacity ◽  
System Level ◽  
Experimental Program ◽  
Small Scale ◽  
Cementitious Composite ◽  
Energy Absorption Capacity ◽  
Engineered Cementitious Composite

The behavior of reinforced concrete (RC) and reinforced engineered cementitious composites (ECC) was comparatively investigated at the component and system levels through a small-scale (1/8 scale factor) experimental program. The logistical and financial advantages of small-scale testing were utilized to investigate a range of parameters, including the effect of reinforcement ratio and material properties, on the response of reinforced concrete and reinforced ECC structures. The procedures pertaining to material preparation, specimen construction, and input motion development that were critical for enhancing the similarity between the scales are provided. Engineered cementitious composite mixtures with different cost and sustainability indices were evaluated. Under cyclic loading, the stiffness, strength, ductility, and energy absorption capacity of columns made of different ECC mixtures were found to be 110, 65, 45, and 100% higher, respectively, than those of the RC columns. The system level investigation through hybrid simulation showed that the ECC structures sustain less deformation under earthquake excitation due to high energy absorption capacity of the material. The differences in cost, sustainability, and structural performance of different ECC mixtures suggest that a careful selection of materials is required for optimal performance.

scholarly journals Mechanisms of energy absorption in special devices for use in earthquake resistant structures

1972 ◽  
Vol 5 (3) ◽  
pp. 63-88 ◽  
Author(s):  
J. M. Kelly ◽  
R. I. Skinner ◽  
A. J. Heine
Keyword(s):  
Reinforced Concrete ◽  
Kinetic Energy ◽  
Mild Steel ◽  
Energy Absorption ◽  
Earthquake Engineering ◽  
Absorption Capacity ◽  
Concrete Frames ◽  
Energy Absorption Capacity ◽  
Structural Applications ◽  
Energy Absorbing

A structure designed to resist earthquake attack must have a capacity to dissipate kinetic energy induced by the ground motion. In most structures this energy absorption is developed in the vicinity of beam to column connections. Recent research has shown that connections are not reliable when subject to cyclic loading, such as results from earthquake attack. Connections in steel frames deteriorate due to local instabilities in adjacent flanges, and in reinforced concrete frames alternating shear
loads produce diagonal tension and bond failures which progressively reduce the strength of the connection. Much work in building research and earthquake engineering in laboratories throughout the world is directed toward increasing the reliability and energy absorption capacity of structural connections. In this paper an alternative approach to this problem is described. This approach is to separate the load carrying function of the structure from the energy absorbing function and to ask if special devices could be incorporated into the structure with the sole purpose of absorbing the kinetic energy generated in the structure by earthquake attack. To determine whether such devices are feasible a study has been undertaken of three essentially different mechanisms of energy absorption. These mechanisms all utilized the plastic deformation of mild steel. They included the rolling of strips, torsion of square and rectangular bars,
 and the flexure of short thick beams. These mechanisms were selected for intensive study since they were basic to three different types of device each of which was designed for a separate mode of operation in a structural system. The characteristics of these mechanisms which were of primary importance in this study were the load displacement relations, the energy absorption capacity and the fatigue resistance. This information was obtained with a view to the development of devices for specific structural applications. This report describes the tests used to explore the basic mechanisms and the data obtained. It also include s a brief description of tests on scale models of a device which was designed to be located in the piers of a reinforced concrete railway bridge. It has been shown by the tests that the plastic torsion of mild steel is an extremely efficient mechanism for the absorption of energy. It was found that at plastic strains in the range 3% to 12% it was possible to develop energy dissipation of the order of 2000-7500 lb in/in3 per cycle (14-50 x 106 N/M2 per cycle) with lifetimes within the range of 1000 to 100 cycles. It was also shown that the mode of failure in torsion is an extremely favourable one for use in an energy absorbing device in that it took the form of a gradual decay. The other two mechanisms studied were both less efficient and less reliable than torsion and had capacities of 500-2000 lb in/in3 per cycle (3.5 - 14 x 106 N/M2 per cycle) and life times of around 200 to 20 cycles. Nevertheless they lend themselves to more compact devices than does the torsional mechanism and furthermore the devices may be located in regions in a structure where they are readily accessible for replacement after attack.

scholarly journals Energy Absorption Evaluation of CFRP-Strengthened Two-Spans Reinforced Concrete Beams under Pure Torsion

2019 ◽  
Vol 5 (9) ◽  
pp. 2007-2018 ◽  
Author(s):  
Ammar N. Hanoon ◽  
Ali A. Abdulhameed ◽  
Haider A. Abdulhameed ◽  
Saad K. Mohaisen
Keyword(s):  
Reinforced Concrete ◽  
Energy Absorption ◽  
Concrete Beams ◽  
Absorption Capacity ◽  
Reinforced Concrete Beams ◽  
Experimental Program ◽  
Rc Beams ◽  
Pure Torsion ◽  
Energy Absorption Capacity ◽  
Strengthened Beam

For more than a decade, externally bonded carbon fiber reinforced polymer (CFRP) composites successfully utilized in retrofitting reinforced concrete structural elements. The function of CFRP reinforcement in increasing the ductility of reinforced concrete (RC) beam is essential in such members. Flexural and shear behaviors, ductility, and confinement were the main studied properties that used the CFRP as a strengthening material. However, limited attention has been paid to investigate the energy absorption of torsion strengthening of concrete members, especially two-span concrete beams. Hence, the target of this work is to investigate the effectiveness of CFRP-strengthening technique with regard to energy absorption of two-span RC beams subjected to pure torsion. The experimental program comprises the investigation of two groups; the first group comprises eight un-strengthened beam specimens, while the second group consists of eight strengthened beam specimens tested under torsional forces. The energy absorption capacity measured from the area under the curve of torque-angle of twist for tested beams. Two parameters were studied, the influence of concrete compressive strength and the angle of a twist. Experimental results indicated that all beams wrapped with CFRP sheet display superior torsional energy absorption capacity compared to the control specimens. The energy absorption may consider as a safety index for the torsional capacity of two-span RC beams under service loadings. Therefore, it is possible to avoid structural as well as material damages by understanding the concept of energy absorption that is one of the important experimental findings presented in this study.

scholarly journals Energy Absorption Capacity of Reinforced Concrete Beam-Column Connections, with Ductility Classes Low

2014 ◽  
Vol 2 (1) ◽  
pp. 42-52 ◽  
Author(s):  
Mohammadamin Azim ◽  
Azlan Bin Adnan ◽  
Mohd Hanim Osman ◽  
Abdul Rahman Bin Mohd Sam ◽  
Iman Faridmehr ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Energy Absorption ◽  
Concrete Beam ◽  
Reinforced Concrete Beam ◽  
Absorption Capacity ◽  
Energy Absorption Capacity

Effects of the Reinforcement Positions and Number of Nickel-Titanium SMA Wires on the Structural Properties of HIHFR Beams

2019 ◽  
Vol 947 ◽  
pp. 228-235
Author(s):  
Seung Jo Lee ◽  
Jung Min Park
Keyword(s):  
Reinforced Concrete ◽  
Energy Absorption ◽  
Structural Characteristics ◽  
Reinforced Concrete Beam ◽  
Absorption Capacity ◽  
Fiber Reinforced Concrete ◽  
Hybrid Fiber ◽  
Energy Absorption Capacity ◽  
Displacement Ductility ◽  
The Relationship

This study investigated the effects of the reinforcement positions and the number of shape memory alloys (SMAs) on the structural characteristics of highly intelligent hybrid fiber reinforced concrete (hereinafter, HIHFR) beams. First, tests were conducted under monotonic loading conditions. To examine such structural characteristics, the load-deflection curve relationship and crack patterns, temperature and energy absorption, temperature and displacement ductility, displacement ductility and energy absorption, and the relationship between the displacement ductility and resilience were compared and analyzed. The reinforced concrete beam (RCB) exhibited somewhat excellent values in terms of displacement ductility, but showed the lowest values in terms of strength, resilience, and energy absorption capacity. HIHFR1 exhibited the most excellent results among the test samples in terms of resilience and energy absorption capacity. Therefore, SMAs were partially substituted for the compressive, tension, and shear reinforcement of the existing RCBs. As a result, the substitution for the compressive and tension reinforcement exhibited the best results, confirming the possibility of using SMAs as a substitute for steel reinforcement.

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