scholarly journals A Study on Tensile Behavior According to the Design Method for the CFRP/GFRP Grid for Reinforced Concrete

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 357
Author(s):  
Jin Sung Kim ◽  
Seong Jong Kim ◽  
Kyoung Jae Min ◽  
Jung Chul Choi ◽  
Hwa Seong Eun ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Design Method ◽  
Grid Point ◽  
Tensile Load ◽  
Tensile Behavior ◽  
Resin Infusion ◽  
Element Analysis ◽  
Load Bearing ◽  
Reinforced Plastics ◽  
Extension Fracture

In the present study, fiber-reinforced plastics (FRP) grid-reinforced concrete with very rapid hardening polymer (VRHP) mortar composites were fabricated using three types of design methods for the FRP grid (hand lay-up method, resin infusion method, and prepreg oven vacuum bagging method), along with two types of fibers (carbon fiber and glass fiber) and two types of sheets (fabric and prepreg). The FRP grid was prepared by cutting the FRP laminates into a 10 mm thick, 50 mm × 50 mm grid. The tensile behavior of the FRP grid embedded in composites was systematically analyzed in terms of the load extension, fracture mode, partial tensile strain, and load-bearing rate. The CFRP grid manufactured by the prepreg OVB method showed the best tensile behavior compared to the CFRP grid manufactured by the hand lay-up and resin infusion methods. The load-bearing of each grid point was proportional to the height from the load-bearing part when reaching the maximum tensile load. In addition, finite element analysis was conducted to compare the experimental and analysis results.

The Finite-Element Simulation for Reinforced Concrete Frames Including the Softening Behaviour

2011 ◽  
Vol 243-249 ◽  
pp. 204-208
Author(s):  
Wei Guo Jiang
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Design Method ◽  
Nonlinear Static Analysis ◽  
Moment Frames ◽  
Concrete Frames ◽  
Element Analysis ◽  
Softening Behavior ◽  
Performance Based Seismic Design ◽  
Seismic Design Method

In performance-based seismic design method, it is very important to have a good command of the nonlinear performance of a structural system, including in the collapse stage. In this paper, a nonlinear finite-element analysis on reinforced concrete moment frames is carried out. After studying the forces and deformations behavior in beam-column elements, the element stiffness matrix of distributed plasticity beam-column element is deduced using the Cotes scheme with 5 integration points. During the occurrence and development of plastic hinges, sections at some integration points will experience loading, unloading and reverse loading and the stiffness of these sections will experience various status. A quadrilinear form moment-curvature relationships with curvature- softening behavior and the hysteretic modes are used in the nonlinear static analysis program. The numerical analysis is carried out and the numerical results validate the load-displacement relationships and the yield mechanism of experiment frames.

scholarly journals Experimental and FEA Evaluation of AA2014/TIC Composites

2019 ◽  
Vol 8 (2) ◽  
pp. 5636-5639 ◽  
Keyword(s):  
Finite Element ◽  
Testing Machine ◽  
Tensile Load ◽  
Tensile Specimen ◽  
Stir Casting ◽  
Tensile Behavior ◽  
Casting Method ◽  
Element Analysis ◽  
Ansys Apdl ◽  
Fea Analysis

AA2014/titanium carbide composites (Al-MMCs) included with diverse mass fraction of TiC (0, 4 and 8 wt.%) were made through stir casting method. This present work, examines the tensile behavior of the fabricated specimen and finite element modeling based tensile specimen. Experimental tensile specimens are examined through ultimate testing machine (UTM). The modeling of the tensile specimen has been developed in ANSYS 12.0 for finite element analysis, which are the most standard CAE tools. Tensile load values are calculated by experimental method and that load values are given as input to the FEA analysis. The finite element outcomes employing ANSYS APDL software exhibiting stresses and deflections were confirmed with experimental upshots and analytical outcomes.

Carbon Fiber Reinforced the Cracking Framework Top Side Columns Caused by Roof Temperature Deformation

2014 ◽  
Vol 527 ◽  
pp. 3-6
Author(s):  
Wei Zhang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Carbon Fiber ◽  
Design Method ◽  
Temperature Deformation ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Fiber Materials ◽  
Roof Temperature

An example of horizontal cracks on the surface of reinforced concrete side-columns is presented. Based on the finite element analysis , a conclusion is made that those cracks are caused by the frame’s deformation under changing temperature. Then the way to calculate the width of such cracks is raised. The design method for the reparation by sticking carbon fiber materials to the column is also developed. Those methods are applicable in realistic works.

scholarly journals Interventions to Structural System of Masonry Buildings and their Effects to their Seismic Response

2019 ◽  
Vol 13 (1) ◽  
pp. 99-113
Author(s):  
Fillitsa V. Karantoni ◽  
Dimitris N. Sarantitis
Keyword(s):  
Reinforced Concrete ◽  
Seismic Response ◽  
Design Decision ◽  
Structural System ◽  
Reinforced Concrete Frame ◽  
Element Analysis ◽  
Load Bearing ◽  
Advantages And Disadvantages ◽  
Out Of Plane ◽  
Plane Bending

Background: Preservation of listed buildings, depending on the importance of each one, requires the conservation of the whole structure or of only the external walls, often called shell of the building, or even only of the façade. In the latter cases, although the new structure is studied to undergo the applied loads according to the codes in force, less research is made to study the response of the remaining structure under seismic loads. Objective: The response of unreinforced masonry (URM) structures with alterations of the original load bearing system to strong ground motions is studied in the present paper. Commonly used radical interventions comprise the addition of a steel or reinforced concrete frame in the interior of the structure after removal of interior load bearing or/and dividing walls. The embedded substructure is designed to support the functional loads of the building and commensurate seismic design forces associated with its mass. In this setting, perimeter walls are relieved of any bearing action apart from resisting the state of stress associated with their self-weight. An important design decision is the extent of contact and interaction that is allowed to occur between the perimeter URM walls and the interior structural system; both options present advantages and disadvantages. Methods: The effect that this design option has on the seismic response of the composite system is studied in this paper using linear elastic finite element analysis. The effect of each intervention is estimated by comparing the principal tensile stresses (pts) developed on the walls before and after each intervention as well as the percentage of the wall areas in elevation where the pts are higher than tensile strength of masonry. Results: It is found that connection of the frame to the masonry walls at several points around the floor and roof perimeters creates a diaphragm action that effectively reduces the out-of-plane bending of the self-standing perimeter URM walls without excessive local stress intensities and increases the shear strength of the building. Lack of contact between the old and new load bearing elements leads to higher intensity stresses due to bending and only the addition of a reinforced concrete tie belt at the top of the walls may mitigate serious damage. Conclusions: The cooperation of the Moment Resisting Frames, irrespective of the material of the frame (reinforced concrete or structural steel) and the walls by connecting the perimeter structural walls with it at floor and roof levels, is more efficient to the stress state of the walls transforming the critical out-of-plane bending of later to shear one, preventing them from out-of-plane collapse.

scholarly journals Investigation of Diagonal Strut Actions in Masonry-Infilled Reinforced Concrete Frames

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Seung-Jae Lee ◽  
Tae-Sung Eom ◽  
Eunjong Yu
Keyword(s):  
Reinforced Concrete ◽  
Failure Mode ◽  
Yield Criterion ◽  
Friction Angle ◽  
Concrete Frames ◽  
Element Analysis ◽  
Reinforced Concrete Frames ◽  
Infilled Frames ◽  
Masonry Infills ◽  
Push Down

AbstractThis study analytically investigated the behavior of reinforced concrete frames with masonry infills. For the analysis, VecTor2, a nonlinear finite element analysis program that implements the Modified Compression Field Theory and Disturbed Stress Field Model, was used. To account for the slip behavior at the mortar joints in the masonry element, the hyperbolic Mohr–Coulomb yield criterion, defined as a function of cohesion and friction angle, was used. The analysis results showed that the lateral resistance and failure mode of the infilled frames were significantly affected by the thickness of the masonry infill, cohesion on the mortar joint–brick interface, and poor mortar filling (or gap) on the masonry boundary under the beam. Diagonal strut actions developed along two or three load paths on the mortar infill, including the backstay actions near the tension column and push-down actions near the compression columns. Such backstay and push-down actions increased the axial and shear forces of columns, and ultimately affect the strength, ductility, and failure mode of the infilled frames.

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