Experimental and numerical evaluation of innovated T-resisting frames with haunched horizontal plate girders

2020 ◽  
Vol 23 (8) ◽  
pp. 1669-1682
Author(s):  
Payam Ashtari ◽  
Mohammad Rahnemoun ◽  
Irandokht Rasouli
Keyword(s):  
Seismic Response ◽  
Numerical Evaluation ◽  
Horizontal Plate ◽  
Link Length ◽  
Main Concept ◽  
Shear Yielding ◽  
Plate Girders ◽  
Modeling Techniques ◽  
Test Result ◽  
Abaqus Software

In this article, a novel configuration for innovated T-resisting frames is proposed. New configuration uses haunched beams with three configurations as horizontal plate girders with prismatic link beam. Using haunched beams confirms T-resisting frame main concept with shear yielding which results in better seismic performance. Haunch configuration leads to achieve any link length ratio especially for very short links. To evaluate seismic response of the haunched beam, a half scale T-resisting frame specimen with haunched configuration at side column face is subjected to a proper cyclic loading protocol. In addition, the same frame is modeled in ABAQUS software to validate the modeling techniques. Results of verification showed good conformity between numerical analysis and test result. Finally, several numerical examples are studied to investigate the effect of height and span length on T-resisting frames with different haunch locations and various link lengths in seismic response. It was found that shear yielding of haunched beams results in high ductility and more energy dissipation and a proper behavior in comparison with prismatic ones.

scholarly journals Validation of a Design Procedure for Failure Mode Control of EB-Frames: Push-Over and IDA Analyses

2013 ◽  
Vol 7 (1) ◽  
pp. 193-207 ◽  
Author(s):  
Luigi Mastrandrea ◽  
Elide Nastri ◽  
Vincenzo Piluso
Keyword(s):  
Seismic Response ◽  
Failure Mode ◽  
Design Procedure ◽  
High Energy ◽  
Collapse Mechanism ◽  
Braced Frames ◽  
Link Length ◽  
Eccentrically Braced Frames ◽  
Ductility Demand ◽  
Global Type

The paper is devoted to the investigation of the seismic response of eccentrically braced frames characterised by links having different length. In addition, the analysed structures have been designed according to a methodology, already proposed by the authors, aiming to guarantee a collapse mechanism of global type. Therefore, the results of the nonlinear analyses herein presented provide the validation of the proposed design procedure, by testifying that all the designed structures exhibit a global failure mode where all the links are yielded while all the columns remain in elastic range with the exception of the base section of first storey columns, leading to high energy dissipation capacity and global ductility. Furthermore, two different distributions of the link lengths are examined. The first one is characterised by short links with uniform lengths along the height of the structure. The second one is characterised by the use of link elements having different length at the different storeys which are selected to assure the same value of the non-dimensional link length. The seismic response of EB-Frames with such distributions of the link length is investigated by means of both push-over analyses and dynamic non-linear analyses. The comparison of the performances is mainly carried out in terms of plastic hinges distribution, local ductility demand and frame lateral stiffness.

scholarly journals Numerical evaluation on the efficiency of the submerged horizontal plate type wave energy converter

2019 ◽  
Vol 47 (3) ◽  
pp. 543-551
Author(s):  
Flávio Seibt ◽  
Camargo de ◽  
Santos Dos ◽  
Neves Das ◽  
Luiz Rocha ◽  
...  
Keyword(s):  
Wave Energy ◽  
Numerical Evaluation ◽  
Wave Energy Converter ◽  
Horizontal Plate ◽  
Energy Converter ◽  
Type Wave ◽  
Submerged Horizontal Plate ◽  
Plate Type

scholarly journals Numerical Evaluation of Seismic Response of Asymmetrical Reinforced Concrete Frame Buildings

2018 ◽  
Vol 7 (4.20) ◽  
pp. 491
Author(s):  
Mohammed J. Hamood ◽  
Layla A. Ghalib ◽  
Ameer G. Abdalwahab
Keyword(s):  
Reinforced Concrete ◽  
Dynamic Analysis ◽  
Seismic Response ◽  
Numerical Evaluation ◽  
Seismic Capacity ◽  
Reinforced Concrete Frame ◽  
Joint Research ◽  
Accurate Analysis ◽  
Static And Dynamic Analysis ◽  
Nonlinear Static

Asymmetrical multi-storey buildings are almost unavoidable in modern structures due to various types of useful and architectural requirements. Latest earthquakes showed that irregular distribution of mass, stiffness and strength cause serious damage in building structural systems. This paper investigates the numerical simulation of buildings with plan irregularity and presents a case study to demonstrate the numerical evaluation of the seismic response of a three real plan-asymmetric reinforced concrete building tested at full scale at the European Laboratory for Structural Assessment of the Joint Research Center, Ispra / Italy within the SPEAR project. The structural evaluation performed through a validated Finite Elements Package, modeled by the general purpose ABAQUS, which is able to run accurate analysis, in particular nonlinear static and dynamic analysis considering both geometric nonlinearity and material inelasticity.Adequacy of the numerical modeling is verified by comparing numerical and experimental results through evaluation of the seismic capacity and dynamic characteristics of the building. The provisions of the adopted seismic code for designing such buildings are also checked over and done with the nonlinear static and dynamic analysis by verifying the proficiency of an analytical model for simulating the nonlinear response of structures considered to conduct an investigation into experiments.   

Electron Microscopic Characterization and Quantitation of Air Borne Particulate Matter with Special Emphasis on Asbestos

1972 ◽  
Vol 30 ◽  
pp. 356-357
Author(s):  
Peter K. Mueller ◽  
Glenn R. Smith ◽  
Leslie M Carpenter ◽  
Ronald L. Stanley
Keyword(s):  
Electron Microscopy ◽  
Light And Electron Microscopy ◽  
Ambient Air ◽  
Quality Standard ◽  
Primary Objective ◽  
Cellulose Ester ◽  
Main Concept ◽  
Electron Microscopic ◽  
Air Samples ◽  
Diffraction Patterns

At the present time the primary objective of the electron microscopy group of the Air and Industrial Hygiene Laboratory is the development of a method suitable for use in establishing an air quality standard for asbestos in ambient air and for use in its surveillance. The main concept and thrust of our approach for the development of this method is to obtain a true picture of fiber occurrence as a function of particle size and asbestos type utilizing light and electron microscopy.We have now available an electron micrographic atlas of all asbestos types including selected area diffraction patterns and examples of fibers isolated from air samples. Several alternative approaches for measuring asbestos in ambient air have been developed and/or evaluated. Our experiences in this regard will be described. The most promising method involves: 1) taking air samples on cellulose ester membrane filters with a nominal pore size of 0.8 micron; 2) ashing in a low temperature oxygen plasma for several hours;

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