scholarly journals Damage mechanism of existing RC slabs with reinforcing steel plate

2019 ◽  
Vol 258 ◽  
pp. 05011
Author(s):  
Kenta Namba ◽  
Chikako Fujiyama ◽  
Tsutomu Niina
Keyword(s):  
Cross Sections ◽  
Three Dimensional ◽  
Simulation Models ◽  
Damage Mechanism ◽  
Steel Plates ◽  
Reinforcing Steel ◽  
Wheel Load ◽  
Element Analysis ◽  
Rc Slab ◽  
Rc Slabs

The purpose of this study was to clarify the damage mechanisms of existing reinforced concrete (RC) slabs with reinforcing steel plates through the use of a three-dimensional nonlinear finite element analysis. An actual wheel load running test was simulated. Two panels of RC slab were cut from existing bridges and were used as the test specimens. Simulation models were built for each specimen with different modeling concepts for the rebar; RC elements, and solid elements. After the wheel load running simulations, the strains were examined through use of the strain contours at various cross sections. In the model using solid element for the rebars, the mechanisms for the generation and development of the horizontal cracks were analyzed in detail. Furthermore, the strain components of the referential elements were carefully analyzed for different loading cycles and positions. Although the decisive cause of the horizontal crack has not been clarified yet, the crack development processes were mostly demonstrated through this study.

Nonlinear Finite Element Analysis of Spring-Back Characteristics in the Cold-Forming Process of Three-Dimensionally Curved Thick Metal Plates

2013 ◽  
Vol 135 (3) ◽  
Author(s):  
Jeom Kee Paik ◽  
Jeong Hwan Kim ◽  
Bong Ju Kim ◽  
Chang Hyo Tak
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Steel Plates ◽  
Research Centre ◽  
Spring Back ◽  
Forming Process ◽  
Element Analysis ◽  
Cold Forming ◽  
Metal Plates ◽  
National University

The present paper is part of the study to develop the advanced computer aided manufacture (CAM) system called the changeable die system (CDS) that applies the cold-forming technique to produce curved thick metal plates with complex, three-dimensional geometry [Paik et al., 2009, “Development of the Changeable Die System for the Cold-Forming of Three-Dimensionally Curved Metal Plates,” The Lloyd's Register Educational Trust Research Centre of Excellence, Pusan National University, Korea]. This paper focuses on the procedure of predicting the spring-back characteristics using elastic-plastic large deflection finite element method, which is a key technical element within the framework of the CDS process. The validity of the procedure is confirmed by comparison with experimental results obtained by the CDS machine in the cold-forming process of curved steel plates.

Stiffness and design for strength of trapezoidal Belleville springs

2011 ◽  
Vol 46 (8) ◽  
pp. 825-836 ◽  
Author(s):  
N L Pedersen ◽  
P Pedersen
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Cross Sections ◽  
Poisson Ratio ◽  
Three Dimensional ◽  
Displacement Curve ◽  
Structural Behaviour ◽  
Design Standards ◽  
Element Analysis ◽  
Non Linear

Belleville springs or coned disc springs are commonly used in machine design. The geometric dimensions of the spring and the determination of non-linear force–displacement curve are regulated by different standards. However, the theory behind Belleville spring design standards is founded on a study published in 1936. Furthermore, the common spring design with cross-sections of uniform thickness poses problems in terms of non-uniformity of stress distribution. In view of this, non-linear three-dimensional finite element analyses of spring designs including uniform or variable thickness are carried out in this paper. Finite element results are compared with analytical predictions and critically analysed in terms of the effect of Poisson ratio, overall stiffness, and stress distribution in the spring. This is done in order to verify the range of validity of design standards. Finite element analysis emerges as a powerful and computationally cheap approach to assess the structural behaviour of Belleville springs regardless of their geometry and level of non-linearity.

scholarly journals Simplified 2D Finite Element Model for Calculation of the Bearing Capacity of Eccentrically Compressed Concrete-Filled Steel Tubular Columns

2021 ◽  
Vol 11 (24) ◽  
pp. 11645
Author(s):  
Anton Chepurnenko ◽  
Batyr Yazyev ◽  
Besarion Meskhi ◽  
Alexey Beskopylny ◽  
Kazbek Khashkhozhev ◽  
...  
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Cross Sections ◽  
Three Dimensional ◽  
Element Model ◽  
Longitudinal Force ◽  
Effective Area ◽  
Element Analysis ◽  
Tubular Columns ◽  
Cfst Columns

Concrete-filled steel tubular (CFST) columns are widely used in construction due to effective resistance to compression and bending joint action. However, currently, there is no generally accepted effective calculation method considering both nonlinearities of the materials and lateral compression. The article proposes the finite element analysis method of concrete-filled steel tubular columns in a physically nonlinear formulation by reducing a three-dimensional problem to a two-dimensional one based on the hypothesis of plane sections. The equations of Geniev’s concrete theory of plasticity are used as relations establishing the relationship between stresses and strains. The technique was tested by comparing the solution with the calculation in a three-dimensional formulation in the LIRA-SAPR software package and with the experimental data of A.L. Krishan and A.I. Sagadatov. It has been established that the effective area of operation of circular-section columns are small eccentricities of the longitudinal force. The proposed approach can be applied to analyzing the stress–strain state and bearing capacity of pipe-concrete columns of arbitrary cross-sections. There are no restrictions on the composition of concrete, and the shell material can be steel and fiberglass.

scholarly journals Finite Element Simulation Research on Medium Plate Multi-Pass Welding Temperature Field

2015 ◽  
Vol 9 (1) ◽  
pp. 786-790
Author(s):  
Huawei Liu ◽  
Linxin Niu
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Heat Source ◽  
Steel Plate ◽  
Three Dimensional ◽  
Steel Plates ◽  
Element Analysis ◽  
Welding Temperature ◽  
Welding Arc ◽  
Input Position

V-grooved steel plate 30mm in thickness has been taken into consideration to research on the distribution of temperature field for the multi-pass welding of steel plate with intermediate thickness in the whole process of welding and cooling. With the establishment of a reasonable three-dimensional solid model, the utility of ANSYS software for finite element analysis, the usage of birth-death elements and the setting of normal Gauss heat source, steps have been undertaken to achieve the goal that the process of multi-pass welding about steel plate in intermediate thickness is simulated and the law of distribution about welding temperature field is obtained. The research results indicate the following: the temperature in every point of base metal changes constantly when the steel plate 30mm in thickness is being welded, the heat input position and position behind heat source are the integral parts which have the highest temperature during the process that welded joints are welded, the temperature gradient in front of welding arc is pretty large as well as that behind welding arc is relatively small. The calculation results are consistent with actual observations providing exactly reliable references for stress field of the welding on steel plates.

scholarly journals Implant Inclination and Horizontal Misfit in Metallic Bar Framework of Overdentures: Analysis By 3D-FEA Method

2018 ◽  
Vol 29 (2) ◽  
pp. 166-172 ◽  
Author(s):  
Ricardo Armini Caldas ◽  
Carmem Silvia Costa Pfeifer ◽  
Ataís Bacchi ◽  
Mateus Bertolini Fernandes dos Santos ◽  
Vagner Flávio Reginato ◽  
...  
Keyword(s):  
Bone Tissue ◽  
Cross Sections ◽  
Alveolar Bone ◽  
Three Dimensional ◽  
Element Analysis ◽  
3D Fea ◽  
Negative Effect ◽  
Von Mises ◽  
The Right ◽  
Three Dimensional Finite Element

Abstract The aim of this study was to evaluate by three-dimensional finite element analysis (3D-FEA) the biomechanics involved in bar-framework system for overdentures. The studied factors were latero-lateral angulation in the right implant (-10, -5, 0, 5 and 10 degrees), and different bar cross-sections (circular, Hader and oval) presenting horizontal misfits (50 or 150 µm) on the opposite implant. Positive angulation (5 and 10 degrees) for implant inclination to mesial position, negative angulation (-5 and -10 degrees) for distal position, and zero degree for parallel implants. The von Mises stresses evaluated the bar, screw and the implant; maximum principal, minimum principal and shear stress analyses evaluated the peri-implant bone tissue. Parallel implants provide lower stress in alveolar bone tissue; mesial inclined bars showed the most negative effect on prosthetic structures and implants. In conclusion, bar cross-section showed no influence on stress distribution for peri-implant bone tissue, and circular bar provided better behavior to the prosthetic system. Higher stress concentration is provided to all system as the misfit increases.

Investigation on Steel Staggered-Truss System RC Slab

2012 ◽  
Vol 446-449 ◽  
pp. 49-53
Author(s):  
Qing Sheng Guo ◽  
Qing Shan Yang
Keyword(s):  
Response Spectrum ◽  
High Stress ◽  
Shell Element ◽  
3D Models ◽  
Structure Design ◽  
Vertical Load ◽  
Element Analysis ◽  
Design Defect ◽  
Rc Slab ◽  
Rc Slabs

For steel staggered-truss (SST) system, RC slabs are the main structure members to make the whole building work together beside to take the vertical load. There are openings in the RC slabs due to requirement of staircases、lift wells and other services, these openings will reduce the stiffness of RC slab and make stress concentration. Usually, the RC slab is designed under vertical load only, this will lead to the design defect and building calapse for SST structure. There are few research for SST RC slab are presented untill now. In the paper, based on two different 3D models considering or ignoring the stiffness of infilled walls (SIW), a numerical investigation is presented on the structural behaviors of the SST system utilizing the soft ware ETABS. As a finite element analysis method, the shell element is adopted for RC slab & infilled wall, the beam element is adopted for beam、colum and truss members. The structure is asymmetrical due to the SIW, it causes the torsional forces in the building and the extra stresses in the RC slabs, the additional reinforcement need to be provided to strengthen the high stress areas. Comparing with the results of response spectrum analysis under the combination with earth quake load, we make some conclusions, including the capacity of anti-seismic and the effect of the SIW for SST system RC slab，that could be a reference for SST structure design.

scholarly journals Experimental Investigation of an RC Slab Culvert Rehabilitated with Grouted CSPs

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Bai-Jian Li ◽  
Wen-Qiang Fu ◽  
Yu-Ting He ◽  
Xin-Sha Fu
Keyword(s):  
Shear Failure ◽  
Estimation Method ◽  
Steel Plates ◽  
Loading Capacity ◽  
Flexural Failure ◽  
Arch Effect ◽  
Load Carrying ◽  
Rc Slab ◽  
Rc Slabs ◽  
Test Loading

The rehabilitation of an existing culvert with corrugated steel plates (CSPs) has been an emerging technology in recent years, but engineers and researchers are not particularly clear about the working principle of the rehabilitated structure. To investigate the mechanical properties of reinforced concrete (RC) slabs rehabilitated with CSPs, laboratory tests were carried out to explore the calculation method and influencing factors of load-carrying capacity of RC slab culverts rehabilitated with grouted CSPs. The results revealed the following: the flexural failure of the prerehabilitated RC slab has little influence on the test-loading capacity of the rehabilitated system; shear failure will occur in the RC slab and grout, and an arch effect will be formed in the CSP and grout after rehabilitation; the higher the shear strength of the concrete of the RC slab and grout, the greater the test-loading capacity of the rehabilitated system: the RC slab and grout greatly contribute to the test-loading capacity of the rehabilitated system; CSP changes the ductility of the rehabilitated system at the failure stage. It was found that the estimation method for the test-loading capacity of the rehabilitated system based on the shear capacities of the RC slab and grout and the flexural capacity of the CSP is reasonable; the maximum difference between the theoretical and experimental results was less than 30%, and the minimum difference between them was 0%.

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