Finite element simulation of cyclic flexural behavior for braced frame beam-column connections

2012 ◽  
pp. 221-228
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Flexural Behavior ◽  
Braced Frame ◽  
Element Simulation

scholarly journals Experimental Study on Energy Dissipation Performance and Failure Mode of Web-Connected Replaceable Energy Dissipation Link

2019 ◽  
Vol 9 (15) ◽  
pp. 3200 ◽  
Author(s):  
Zhanzhong Yin ◽  
Zhaosheng Huang ◽  
Hui Zhang ◽  
Dazhe Feng
Keyword(s):  
Finite Element ◽  
Energy Dissipation ◽  
Finite Element Simulation ◽  
Rotation Angle ◽  
Frame Structure ◽  
Seismic Events ◽  
Mechanical Behaviors ◽  
Braced Frame ◽  
Element Simulation ◽  
Section Size

In the current design method of the eccentrically braced frame structure, the energy dissipation link and the frame beam are both designed as a whole. It is difficult to accurately assess the degree of damage through this method, and it is also hard to repair or replace the energy dissipation link after strong seismic events. Meanwhile, the overall design approach will increase the project’s overall cost. In order to solve the above mentioned shortcomings, the energy dissipation link is designed as an independent component, which is separated from the frame beam. In this paper, the energy dissipation link is bolted to the web of the frame beam. Both finite element simulation and test study of eight groups of energy dissipation links have been completed to study their mechanical behaviors, and the energy dissipation links have been studied in the aspects of length, cross section, and stiffener spacing. The mechanical behaviors include the energy dissipation behavior, bearing capacity, stiffness, and plastic rotation angle. The results indicate clearly that the hysteretic loop of links in the test and finite element analysis is relatively full. By comparing the experimental and finite element simulation data, it can be found that the general shape and trend of hysteretic loop, skeleton curve, and stiffness degradation curve are basically the same. The experiment data explicitly shows that the energy dissipation link of web-connected displays good ductility and stable energy dissipation ability. In addition, the replaceable links possess good rotational capacity when the minimum rotation angle of each specimen in the test is 0.16 rad. The results of the experiment show that the energy dissipation capacity of the link is mainly related to the section size and the stiffening rib spacing of the link. The energy dissipation ability and deformation ability of the link is poorer as the section size becomes larger; meanwhile, these abilities are reduced with the decrease of the stiffening spacing. The experiment result shows that the damage and excessive inelastic deformations are concentrated in the link to avoid any issues for the rest of the surrounding elements, and the links can be easily and inexpensively replaced after strong seismic events. The results are thought provoking, as they provide a theoretical basis for the further study of the eccentrically braced frame structure with replaceable links of web-connected. In future work, the author aims to carry out his studies through optimized design methodology based on the yielding criterion.

Experimental and analytical investigations on flexural behavior of bamboo beams strengthened with steel bars

2021 ◽  
pp. 136943322110262
Author(s):  
Kang Zhao ◽  
Yang Wei ◽  
Shaocong Yan ◽  
Si Chen ◽  
Fenghui Dong
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Finite Element Simulation ◽  
Limit State ◽  
Ultimate Bearing Capacity ◽  
Utilization Efficiency ◽  
Flexural Behavior ◽  
Finite Element Software ◽  
Element Simulation ◽  
Steel Bars

The embedding of steel bars is proposed to enhance the load-bearing performance of bamboo beams. Based on laboratory tests, the bending behavior of bamboo beams reinforced with steel bars or prestressed steel bars was analyzed using finite element software. Comparing the finite element simulation results with those measured in tests, it can be found that the load–displacement curves coincide with each other, and the strain development processes in the mid-span are basically the same. The prediction by the finite element simulation has good accuracy. The embedding of steel bars and prestressed steel bars can effectively improve the ultimate bearing capacity (up to 27.0%), bending stiffness at the serviceability limit state (up to 42.61%), ductility (up to 22.9%), and material utilization efficiency (up to 34.1%) for the bamboo beams. The embedding of steel bars makes the bamboo in the compression zone of the beams develop with higher efficiency, and applying the prestress for steel bars can produce reverse bending deformation and reduce the actual deflection for the reinforced bamboo beam under service load. Under the same reinforcement ratio, the prestress level has a relatively small influence on the ultimate bearing capacity (up to 4.5%) and stiffness (up to 4.5%) of the reinforced beam.

Flexural behavior of additively manufactured Ultem 1010: experiment and simulation

2018 ◽  
Vol 24 (6) ◽  
pp. 1003-1011 ◽  
Author(s):  
Gregory Taylor ◽  
Xin Wang ◽  
Leah Mason ◽  
Ming C. Leu ◽  
K. Chandrashekhara ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Fused Deposition Modeling ◽  
Layer Structure ◽  
Three Dimensional ◽  
Experimental Tests ◽  
Flexural Behavior ◽  
Content Type ◽  
Fused Deposition ◽  
Element Simulation

Purpose The purpose of this paper is to study the flexural behavior of additively manufacture Ultem 1010 parts. Fused deposition modeling (FDM) process has become one of most widely used additive manufacturing methods. The process provides the capability of fabricating complicated shapes through the extrusion of plastics onto a print surface in a layer-by-layer structure to build three-dimensional parts. The flexural behavior of FDM parts are critical for the evaluation and optimization of both material and process. Design/methodology/approach This study focuses on the performance of FDM solid and sparse-build Ultem 1010 specimens. Flexure tests (three-point bend) are performed on solid-build coupons with varying build orientation and raster angle. These parameters are investigated through a full-factorial design of experiments (DOE) to determine optimal build parameters. Air gap, raster width and contour width are held constant. A three-dimensional nonlinear finite element model is built to simulate the flexural behavior of the FDM parts. Findings Experimental results include flexure properties such as yield strength and modulus, as well as analysis of the effect of change in build parameters on material properties. The sparse-build FDM parts chosen from the experimental tests are simulated based on this developed model. Thermo-mechanical simulation results show that the finite element simulation and experimental tests are in good agreement. The simulation can be further extended to other complicated FDM parts. Originality/value From the DOE study, sparse-build coupons with specific build parameters are fabricated and tested for the validation of a finite element simulation.

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