SEISMIC DESIGN VERIFICATION OF STEEL PRE-ENGINEERED BUILDINGS

2016 ◽  
Vol 3 (2) ◽  
Author(s):  
Satish Kumar S. Rajaram ◽  
Nibedita Sahoo
Keyword(s):  
Seismic Design ◽  
Local Buckling ◽  
Element Model ◽  
Reduction Factor ◽  
Response Reduction Factor ◽  
Lateral Capacity ◽  
Post Buckling ◽  
The Moment ◽  
Ductile Behavior ◽  
Strength And Ductility

Steel built-up I sections, composed of plates with high width-to-thickness ratios (slender sections), are commonly used in pre-engineered buildings under the premise that the design is governed by wind. However, in the event of a severe earthquake, the sections are susceptible to local buckling and may exhibit a non-ductile behavior. Therefore it is imperative to check the performance of such structures under the maximum credible earthquake (MCE). As a first step towards this objective, it is necessary to evaluate the post-buckling strength and ductility of such sections. In this study, a Finite element model is developed to analyze the inelastic post-buckling response of semi-compact and slender plates. The information can be used to predict the moment-rotation curves for I-sections with slender webs. A parametric study was carried out on a total of 54 pinned-base PEB frames of varying spans and heights. The elastic seismic demand under severe earthquake was estimated and compared with the design lateral capacity of PEB frames. From the results, it is concluded that even for higher seismic zones, low ductility sections (1.5 to 2) are adequate to survive MCE. Alternatively, if the design is verified for a response reduction factor of 2, then non-ductile sections can also be used.

A numerical investigation of overstrength and ductility factors of moment resisting steel frames retrofitted with GFRP plates

2014 ◽  
Vol 41 (1) ◽  
pp. 17-31 ◽  
Author(s):  
Mohammad Al Amin Siddique ◽  
Ashraf A. El Damatty ◽  
Ayman M. El Ansary
Keyword(s):  
Steel Frames ◽  
Local Buckling ◽  
Element Model ◽  
Steel Beams ◽  
Shell Elements ◽  
Glass Fiber Reinforced ◽  
Moment Resisting ◽  
Spring System ◽  
The Moment ◽  
Nonlinear Finite Element Model

This paper reports the results of an investigation conducted to assess the effectiveness of using glass fiber reinforced polymer (GFRP) plates to enhance the overstrength and ductility factors of moment resisting steel frames. The GFRP plates are bonded to the flanges of steel beams of the frame with an aim to enhance their local buckling capacities and consequently their ductility. The flexural behaviour of GFRP retrofitted beams is first determined using a nonlinear finite element model developed in-house. In this numerical model, consistent shell elements are used to simulate the flanges and web of the steel beam as well as the GFRP plate. The interface between the steel and the GFRP plate is simulated using a set of continuous linear spring system representing both the shear and peeling stiffness of the adhesive based on values obtained from a previous experimental study. The moment–rotation characteristics of the retrofitted beams are then implemented into the frame model to carry out nonlinear static (pushover) analyses. The seismic performance level of the retrofitted frames in terms of overstrength and ductility factors is then compared with that of the bare frame. The results show a significant enhancement in strength and ductility capacities of the retrofitted frames, especially when the beams of the frame are slender.

Numerical Study on Precast RC Wall Panels with Angle Steel Boundary Components

2013 ◽  
Vol 351-352 ◽  
pp. 578-582
Author(s):  
Xiu Feng Xu ◽  
Tao Wang
Keyword(s):  
Seismic Design ◽  
Numerical Study ◽  
Element Model ◽  
Design Code ◽  
Steel Angle ◽  
Seismic Design Code ◽  
Wall Panels ◽  
Angle Steel ◽  
Rc Shear Wall ◽  
Strength And Ductility

To evaluate the seismic behavior of precast reinforced concrete (RC) shear wall with steel boundary components, two pieces of prefabricated RC wall panels are tested quasi-statically under different axial compression forces. Both panels performed larger ductility than requested by the current seismic design code. Finite element model is then constructed to investigate the function of steel boundary components. The model is first calibrated by the experimental results. The strength, stiffness, and crack development all agree well with the phenomenon observed from experiments. Then the area of steel angle is changed as the main parameter to affect the seismic performance of RC wall panels. It is observed that the strength and ductility of a panel with steel boundary components are larger than that with common rebar boundary elements.

scholarly journals Response Reduction Factor for Different Heights of RC Structure

2019 ◽  
Vol 9 (2) ◽  
pp. 3273-3276
Keyword(s):  
Seismic Analysis ◽  
Pushover Analysis ◽  
Reduction Factor ◽  
Framed Structures ◽  
Response Reduction Factor ◽  
Rc Structure ◽  
Non Linear ◽  
Linear Behaviour ◽  
Rc Framed Structures ◽  
Strength And Ductility

Seismic analysis is considered as an important parameter for any structural design. The strength and ductility of frame members in seismic design depends on the response reduction factor. In this paper four symmetrically framed structures are considered of different heights under the critical zone condition. The primary emphases of this work is regarding calculation of response reduction factor values attained from designing RC framed structures. The results are computed by applying non-linear static pushover analysis. SAP-2000 software is used for analyzing the non-linear behaviour of the structure.

Development of Indian standards in EQ resistant design of bridges – past, present and future prospects

2021 ◽  
Author(s):  
Alok Bhowmick ◽  
Harpreet Singh
Keyword(s):  
Seismic Design ◽  
Soil Condition ◽  
Reduction Factor ◽  
Design Parameters ◽  
Seismic Zone ◽  
Ground Acceleration ◽  
Response Reduction Factor ◽  
Local Soil ◽  
Importance Factor ◽  
Indian Railway

<p>Evolution of seismic design provisions in various Indian Standards over the last 50 years have been reviewed in this paper. Seismic provisions of Bureau of Indian Standards (BIS) code (IS 1893), Indian Road Congress (IRC) standard (IRC:6 &amp; IRC:SP:114) and Indian Railway standards (IRS code) are compared. Design parameters for comparison include the seismic zone factor / peak ground acceleration, importance factor, local soil condition, design spectra and response reduction factor.</p>

Efficacy of Importance Factor in Seismic Design of Indian Buildings

2016 ◽  
Vol 857 ◽  
pp. 71-75
Author(s):  
V. Sukumar ◽  
J. Arunachalam ◽  
D.C. Haran Pragalath
Keyword(s):  
Seismic Design ◽  
Reduction Factor ◽  
Seismic Load ◽  
Base Shear ◽  
Public Buildings ◽  
Response Reduction Factor ◽  
Rc Frames ◽  
Time Period ◽  
Importance Factor ◽  
Load Evaluation

At present, seismic load evaluation for design of Indian buildings are carried out using Indian seismic code. In which, building Time period, Response Reduction factor and Importance factor alters design base shear majorly. Currently IS code defines Importance factor differently as “1” for general buildings and “1.5” for public buildings. This factor makes public buildings as heavier sections as it increases design base shear. However there are no evidence that, how this importance factor affects/alters/improves the seismic behavior of buildings. In this present study, four storey RC frames are designed with different importance factors. Pushover analyses are carried out to find its effects on over strength factor and response reduction factor.

Simulation of Cold Bends by Finite Element Method

2004 ◽  
Author(s):  
M. Behbahanifard ◽  
J. J. R. Cheng ◽  
D. W. Murray ◽  
Joe Zhou ◽  
K. Adams ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Local Buckling ◽  
Element Model ◽  
Shell Elements ◽  
University Of Alberta ◽  
Main Pipe ◽  
Residual Curvature ◽  
Residual Strains ◽  
The Moment

A composite finite element model for cold bend simulation of energy pipelines is presented in this paper. Four-node shell elements with material and geometric nonlinearity are used to model a pipe in straight condition. An elastic pipe, having the same nodal coordinates as the main pipe along with elastic radial links are used as a tool to prevent local buckling and ovalization of the main pipe during the cold bend process. By dividing the elastic pipe into series of rings along the axis of the pipe and by conducting a four-step procedure, residual curvature is developed in a specific segment of a pipe. Based on the proposed concept, different methods of cold bending are discussed and the results are presented. University of Alberta cold bend trials were used to validate the proposed finite element model. The moment-curvature response, pattern of imperfections, and distribution of maximum residual strains are obtained by the finite element model and compared with the test results.

scholarly journals Probabilistic seismic response analysis of coastal highway bridges under scour and liquefaction conditions: does the hydrodynamic effect matter?

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Xiaowei Wang ◽  
Yutao Pang ◽  
Aijun Ye
Keyword(s):  
Seismic Response ◽  
Seismic Design ◽  
Highway Bridges ◽  
Element Model ◽  
Response Analysis ◽  
Hydrodynamic Effect ◽  
Strong Earthquakes ◽  
Influence Of Water ◽  
Scour Hazard ◽  
Ground Motion Records

AbstractCoastal highway bridges are usually supported by pile foundations that are submerged in water and embedded into saturated soils. Such sites have been reported susceptible to scour hazard and probably liquefied under strong earthquakes. Existing studies on seismic response analyses of such bridges often ignore the influence of water-induced hydrodynamic effect. This study assesses quantitative impacts of the hydrodynamic effect on seismic responses of coastal highway bridges under scour and liquefaction potential in a probabilistic manner. A coupled soil-bridge finite element model that represents typical coastal highway bridges is excited by two sets of ground motion records that represent two seismic design levels (i.e., low versus high in terms of 10%-50 years versus 2%-50 years). Modeled by the added mass method, the hydrodynamic effect on responses of bridge key components including the bearing deformation, column curvature, and pile curvature is systematically quantified for scenarios with and without liquefaction across different scour depths. It is found that the influence of hydrodynamic effect becomes more noticeable with the increase of scour depths. Nevertheless, it has minor influence on the bearing deformation and column curvature (i.e., percentage changes of the responses are within 5%), regardless of the liquefiable or nonliquefiable scenario under the low or high seismic design level. As for the pile curvature, the hydrodynamic effect under the low seismic design level may remarkably increase the response by as large as 15%–20%, whereas under the high seismic design level, it has ignorable influence on the pile curvature.

Comparative nonlinear seismic analysis of an existing RC bridge designed with obsolete codes

2022 ◽  
pp. 136943322210747
Author(s):  
Germán Nanclares ◽  
Daniel Ambrosini ◽  
Oscar Curadelli
Keyword(s):  
Numerical Model ◽  
Seismic Design ◽  
Seismic Analysis ◽  
Nonlinear Dynamic Analysis ◽  
Highway Bridges ◽  
Element Model ◽  
Cyclic Behavior ◽  
Transverse Reinforcement ◽  
3D Finite Element ◽  
Collapse Mechanisms

The evolution of seismic design and calculation criteria for highway bridges has a direct influence on their structural behavior. This paper presents a nonlinear dynamic analysis using a detailed 3D finite element model of an existing bridge, with different design criteria for the column transverse reinforcement, according to code requirements of different times. The numerical model is able to simulate both the collapse of the structure and the generation of damage in its elements when subjected to extreme seismic actions. Through the numerical model, it is possible to represent the cyclic behavior of the concrete, and to evaluate the influence of the transverse reinforcement assigned to the column on the overall response of the bridge. The formation of plastic hinges is verified, as well as the identification of different collapse mechanisms.

Calculating Mechanics Characteristics of Single-Walled Carbon Nanotube Materials by Finite Element Method

2017 ◽  
Vol 730 ◽  
pp. 548-553
Author(s):  
Jing Ge ◽  
Hao Jiang ◽  
Zhen Yu Sun ◽  
Guo Jun Yu ◽  
Bo Su ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Radial Direction ◽  
Element Model ◽  
Beam Element ◽  
Beam Position ◽  
Single Walled Carbon ◽  
Finite Element Software ◽  
Calculation Results ◽  
The Moment

In this paper, we establish the mechanical property analysis of Single-walled Carbon Nanotubes (SWCNTs) modified beam element model based on the molecular structural mechanics method. Then we study the mechanical properties of their radial direction characteristics using the finite element software Abaqus. The model simulated the different bending stiffness with rectangular section beam elements C-C chemical force field. When the graphene curled into arbitrary chirality of SWCNTs spatial structure, the adjacent beam position will change the moment of inertia of the section of the beam. Compared with the original beam element model and the calculation results, we found that the established model largely reduced the overestimate of the original model of mechanical properties on the radial direction of the SWCNTs. At the same time, compared with other methods available in the literature results and the experimental data, the results can be in good agreement.

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