scholarly journals Response of the Flat Reinforced Concrete Floor Slab with Openings under Cyclic In-Plane Loading

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Eden Shukri Kalib ◽  
Yohannes Werkina Shewalul
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Lateral Displacement ◽  
Load Capacity ◽  
Element Model ◽  
Absorption Capacity ◽  
Hysteretic Behavior ◽  
Element Analysis ◽  
Floor Slab ◽  
Floor Slabs

The responses of flat reinforced concrete (RC) floor slabs with openings subjected to horizontal in-plane cyclic loads in addition to vertical service loads were investigated using nonlinear finite element analysis (FEA). A finite element model (FEM) was designed to perform a parametric analysis. The effects of opening sizes (7%, 14%, 25%, and 30% of the total area of the slab), opening shapes (elliptical, circular, L-shaped, T-shaped, cross, and rectangular), and location on the hysteretic behavior of the floor slab were considered. The research indicated that openings in RC floor slabs reduce the energy absorption capacity and stiffness of the floor slab. The inclusion of 30% opening on the floor slab causes a 68.5%, 47.3%, and 45.6% drop in lateral load capacity, stiffness, and lateral displacement, respectively, compared to the floor slab with no openings. The flat RC floor slab with a circular opening shape has increased efficiency. The placement of the openings is more desirable by positioning the openings at the intersection of two-column strips.

scholarly journals Modelling lead-rubber seismic isolation bearings using the unified mechanics theory

2021 ◽  
Vol 4 (4) ◽  
pp. 213-226
Author(s):  
Hernán Martín Hernández Morales
Keyword(s):  
Finite Element ◽  
Curve Fitting ◽  
Seismic Isolation ◽  
Damage Mechanics ◽  
Element Model ◽  
Hysteretic Behavior ◽  
Newtonian Mechanics ◽  
Element Analysis ◽  
Lead Rubber Bearing ◽  
Period Lengthening

Lead-rubber seismic isolation bearings (LRB) have been installed in a number of essential and critical structures, like hospitals, universities and bridges, in order to provide them with period lengthening and the capacity of dissipating a considerable amount of energy to mitigate the effects of strong ground motions. Therefore, studying the damage mechanics of this kind of devices is fundamental to understand and accurately describe their thermo-mechanical behavior, so that seismically isolated structures can be designed more safely. Hitherto, the hysteretic behavior of LRB has been modeled using 1) Newtonian mechanics and empirical curve fitting degradation functions, or 2) heat conduction theories and idealized bilinear curves which include degradation effects. The reason for using models that are essentially phenomenological or that contain some adjusted parameters is the fact that Newton’s universal laws of motion lack the term to account for degradation and energy loss of a system. In this paper, the Unified Mechanics Theory – which integrates laws of Thermodynamics and Newtonian mechanics – is used to model the force-displacement response of LRB. Indeed, there is no need for curve fitting techniques to describe their damage behavior because degradation is calculated at every point using entropy generation along the Thermodynamics State Index (TSI) axis. A finite element model of a lead-rubber bearing was constructed in ABAQUS, where a user material subroutine UMAT was implemented to define the Unified Mechanics Theory equations and the viscoplastic constitutive model for lead. Finite element analysis results were compared with experimental test data.

Finite Element Analysis of Prestressed Steel Reinforced Concrete Beam

2013 ◽  
Vol 433-435 ◽  
pp. 2302-2308
Author(s):  
Cheng Quan Wang ◽  
Yue Feng Zhu ◽  
Yong Gang Shen
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Element Model ◽  
Reinforced Concrete Beam ◽  
Reinforcement Ratio ◽  
Ultimate Capacity ◽  
Element Analysis ◽  
Steel Reinforced Concrete ◽  
Prestressed Reinforcement ◽  
Strength And Ductility

Non-linear finite element model of prestressed steel reinforced concrete(PSRC) beams were carried out by using software ABAQUS. The effects of the parameters of non-prestressed reinforcement ratio, prestressed reinforcement ratio, effective prestressed force and non-prestressed tendons yield strength on the ultimate strength and ductility of PSRC beam were investigated. It is found that increase of the tension reinforcement ratio has little impact on the ultimate deflection but can improve the ultimate capacity of PSRC beam. Increase of the prestressed steel ratio can significantly improve the cracking load, stiffness and ultimate capacity of PSRC beam. The effective prestressed force can improve the bearing capacity of PSRC beam.

Nonlinear Finite Element Analysis of the Bearing Capacity of a New Type of Column under Axial Load

2011 ◽  
Vol 255-260 ◽  
pp. 45-48 ◽  
Author(s):  
Ya Feng Xu ◽  
Xin Zhao ◽  
Yi Fu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Bearing Capacity ◽  
Axial Load ◽  
Load Capacity ◽  
Element Model ◽  
Steel Tube ◽  
Element Analysis ◽  
Composite Columns ◽  
Steel Ratio

Based on experimental research, the bearing performance of the new column (steel tube-reinforced concrete composite columns combination strengthened with angle steel and CFRP) has been studied in detail by finite element method. A finite element model is established based on a series of assumption. The load-displacement curves are obtained. The influence of steel ratio and thickness of CFRP layers to the bearing capacity is analyzed too. The result shows that both the steel ratio and the thickness of CFRP layers have great contribution to the axial load capacity. The finite element analysis results and theoretical analysis which are in good agreement show that simulation results are generally right.

The Effects of Interbedded Friction on Load Capacity of Rhombic Wire Wound Vessel

2011 ◽  
Vol 221 ◽  
pp. 517-521
Author(s):  
Jun Fei Wu ◽  
Wei Gao ◽  
Xiao Chen Zhu
Keyword(s):  
Finite Element ◽  
Program Development ◽  
Load Capacity ◽  
Element Model ◽  
Parametric Modeling ◽  
Post Processing ◽  
Element Analysis ◽  
Whole Process ◽  
The Finite Element Analysis ◽  
The Finite Element Model

From the parametric modeling, the APDL tool can be used in ANSYS to build the finite element model of rhombic wire wound vessel. Only a small amount of parameters have to be input in order to accomplish the whole process of program development such as constructing model, meshing, creating contact pairs, bringing restrictions and loads to bear on vessels as well as solving and post-processing. It can be easy to use the developed batch program to achieve the finite element analysis of vessels and get the influence of interbedded friction on the load capacity of rhombic wire wound vessel under different working pressures.

scholarly journals Experimental and Numerical Investigation of Short-Term Behavior of Partially Precast and Partially Encased Composite Beams

2020 ◽  
Vol 28 (3) ◽  
pp. 29-39
Author(s):  
Liufeng Zhang ◽  
Yinghua Yang
Keyword(s):  
Finite Element ◽  
Load Capacity ◽  
Peak Load ◽  
Element Model ◽  
Bending Test ◽  
Test Results ◽  
Short Term ◽  
Element Analysis ◽  
The Finite Element Model ◽  
Bending Response

AbstractIn this paper, the short-term behavior of a new partially pre-cast and partially encased composite (PPEC) beam is studied. This paper reports the results of a 4-point bending test on a full-scale PPEC beam and sets out the load displacement response, short-term stiffness, peak load capacity and failure mode of the proposed PPEC beam. In addition, a finite element analysis of the PPEC beam is carried out, and the numerical simulation results are compared with the test results. The results show that the finite element model can reflect the bending response of the PPEC beam. In this paper, three different calculation methods are used to compare the deflection of the PPEC beam. The results show that the values calculated by the bending-shear coupling method formula agree relatively well with the test results.

scholarly journals Numerical Simulation and Experimental Investigation on Seismic Performance of Composite Structural Connection of Encased CFST Column and Reinforced Concrete Beam with Steel Ring

2020 ◽  
Vol 14 (1) ◽  
pp. 309-320
Author(s):  
Aravind Raj Ponsubbiah ◽  
Divahar Ravi ◽  
Sangeetha S P ◽  
Meenambal T ◽  
Frieda F S
Keyword(s):  
Experimental Investigation ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Seismic Performance ◽  
Experimental Studies ◽  
Absorption Capacity ◽  
Rc Beam ◽  
Element Analysis ◽  
Equivalent Viscous Damping ◽  
Structural Connection

Introduction: This paper discusses the seismic characteristics of the composite structural joint between the Encased Concrete Filled Steel Tubular (ECFST) Column and Reinforced Concrete (RC) beam. The hysteresis behaviour, envelope curves, ductility, rigidity degradation, energy absorption capacity, and equivalent viscous damping coefficient are also discussed. Methods: In this study, the reinforcement placed longitudinally in the RC beam, which is disunited at the joint due to the tubular section of the ECFST column, is connected by providing links in the form of steel rings at the joint. In this study, four specimens with circular steel rings and square concrete casing along with two control specimens are considered. The number of ring layers and concentric rings are used in different combinations among the specimens. Results: The structural connection with the circular steel rings and square concrete casing at the ECFST column and RC beam joint showed superior seismic performance due to the provision of the longitudinal bar and the increased confinement at the joint due to the steel rings and additional concrete casing. Conclusion: A comparative study was done between the experimental studies and the numerical analysis from the finite element developed using ANSYS. It was found that the experimental investigation results matched with the finite element analysis.

scholarly journals Finite Element Analysis of Bearing Capacity of Reinforced Concrete Pipe Strengthened by TRC

2021 ◽  
Vol 261 ◽  
pp. 02044
Author(s):  
Xinming Zhao ◽  
Cheng Kan ◽  
Yuxiao Ye ◽  
Shaowei Hu ◽  
Baibing Zhou
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Mesh Size ◽  
Element Model ◽  
Displacement Curve ◽  
Concrete Element ◽  
Element Analysis ◽  
Element Mesh ◽  
Concrete Pipe ◽  
Load Simulation

A non-linear 3D finite element model was established to simulate the three edge-bearing test of TRC reinforced concrete pipe. The pipe load-displacement curve, cracking load, and ultimate load simulation values are in good agreement with the test values. Subsequently, a parametric study was conducted. The effects of reinforcement layer bonding mode, mesh size of concrete element, mesh distribution rate and concrete compressive strength on the performance of reinforced concrete pipeline strengthened by TRC were considered. It provides a basis for the design of TRC reinforced concrete pipes.

Finite Element Analysis of Reinforced Concrete Beam for Carbon Fiber-Reinforced Plastic

2015 ◽  
Vol 730 ◽  
pp. 101-104
Author(s):  
Nan Huang ◽  
Hui Li ◽  
Ping Fei Xu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Reinforced Concrete ◽  
Element Model ◽  
Reinforced Concrete Beam ◽  
Reinforced Concrete Beams ◽  
Flexural Behavior ◽  
Element Analysis ◽  
Reinforced Plastic ◽  
Stress Curve

The flexural behavior of reinforced concrete beams strengthened by CFRP is analyzed by using the way which connected tests with finite element simulation.First,through the test to get the load data of one unstrengthened and one strengthened reinforced concrete beam.Then,the finite element model is carried out based on Ansys finite element analysis software.The reinforced beam carrying capacity is improved based on the test data and finite element calculation results.Steel bars stress change curve, CFRP stress curve and the load displacement curves are in good agreement with experimental results.

Evaluation for RC Column Confined Partially with Externally FRP Wrapping Sheet Using Nonlinear FE Analysis

2019 ◽  
Vol 972 ◽  
pp. 129-133
Author(s):  
Yasmeen Taleb Obaidat
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Load Capacity ◽  
Element Model ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Number Of Layers

Little research has been carried out in validating, fiber reinforced polymer (FRP) concrete strengthened column and the effective using partial wrapping. Also the effect of several parameter on strengthen column using the partial wrapping sheet of desired width and thickness around column have not been found out. To this end, a nonlinear 3D finite element model has been developed in current study for CFRP strengthened reinforced concrete column to simulate the behavior accompanied by the effect of partial wrapping with emphasis on load capacity and failure mode. The finite element simulation of CFRP strengthened RC columns is performed using commercial finite element program ABAQUS. Modelling was conducted on reinforced concrete columns with dimensions of 160 x 250 x 960 mm. The finite element model incorporates the nonlinear material behavior of concrete, bilinear stress-strain curve of steel and linear elastic behavior of CFRP material. The concrete was modeled using a plastic damage model. The performance of the FE model was studied by simulating experimental columns from the literature. The load, and strain of CFRP obtained from the FE study were compared with the corresponding experimental results. The FEM results agreed well with the experiments. In addition, to enhance our understanding of the behavior of strengthened reinforced concrete column capacity using partial wrapping the effect of changing the spacing between the CFRP sheets and number of layers were examined. The increase number of layers and decrease spacing give a higher ultimate load capacity, and delay the failure.

Nonlinear Finite Element Analysis of FRP-Strengthened Reinforced Concrete Panels Under Blast Loads

2016 ◽  
Vol 13 (04) ◽  
pp. 1641002 ◽  
Author(s):  
Xiaoshan Lin ◽  
Y. X. Zhang
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Blast Resistance ◽  
Blast Loading ◽  
Element Model ◽  
Element Analysis ◽  
Strain Rate Effects ◽  
Concrete Panels ◽  
Tension And Compression

A finite element model is developed in this paper for numerical modeling of the structural responses of FRP-strengthened reinforced concrete panels under blast loading. Strain rate effects for concrete in tension and compression, steel reinforcements and FRP sheets are taken into account in the finite element model. The commercial explicit hydrocode LS-DYNA is employed to carry out the numerical analysis. The proposed finite element model is validated by comparing the computed results of a conventional reinforced concrete panel and FRP-strengthened reinforced concrete panels under blast loading with the test data from the literature. In addition, the effects of FRP thickness, retrofitted surface, standoff distance and the charge mass on the blast resistance of FRP-strengthened reinforced concrete panels are investigated in this paper.

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