Steel beams with web openings reinforced on one side

1978 ◽  
Vol 5 (4) ◽  
pp. 451-461 ◽  
Author(s):  
Roger Lupien ◽  
Richard G. Redwood
Keyword(s):  
Strain Hardening ◽  
Ultimate Strength ◽  
Steel Beams ◽  
Web Openings ◽  
The One ◽  
The Web

Tests are described on six beams containing mid-depth rectangular holes which were reinforced by welding horizontal bars to one side of the web. The objective was to evaluate the effect of one-sided reinforcement on the ultimate strength. Particular reference was made to beams with slender webs and to the effect of moment-to-shear ratio. The efficiency of the one-sided reinforcement was judged on the basis of the predicted capacity of a symmetrically reinforced beam with the same reinforcement area. It was found that, due to strain hardening, the ultimate strength achieved was in some cases equal to this predicted strength and, on the basis of such results, suggestions relating to design are made.

scholarly journals Improving Behavior of Castellated Beam by Adding Spacer Plat and Steel Rings

2018 ◽  
Vol 26 (4) ◽  
pp. 331-344 ◽  
Author(s):  
Hayder Wafi Ali Al-Thabhawee ◽  
Muslim Abdul-Ameer Al-Kannoon
Keyword(s):  
Ultimate Strength ◽  
Low Cost ◽  
Element Model ◽  
Steel Beams ◽  
Web Openings ◽  
Modes Of Failure ◽  
Beam Depth ◽  
Zigzag Pattern ◽  
Castellated Beam ◽  
The Web

Castellated steel beams are those members which are made from hot rolled steel I-section firstly by cutting the web in zigzag pattern and rejoining the two halves by welding together to form a hexagonal castellated beam such that the depth of section will be increased. Generally, the openings made in the web are with hexagonal shape; however, octagonal shape of web openings is typically obtained by providing spacer plate which is utilized to increase the depth of beam. Nowadays, using castellated beams in building construction becomes very popular because of their useful functions such as ease of service provision, strength and low cost. This study focuses on improving the behavior of hexagonal and octagonal castellated beam with spacer plate. The ultimate strength of the original (parent) I- section beam increases due to the increasing its depth. The increment of castellated beam depth; however, leads to post buckling in its web and to many other modes of failure when these beams are subjected for loading. Hexagonal and octagonal castellated beams which are fabricated using parent I-section (IPN140) are analyzed using finite element model (FEM).The analysis results revealed that using ring stiffeners around edge of holes contributes effectively in strengthening the web. It was found that using ring steel stiffeners can reduce the stress concentration around the edge of holes and improve the behavior of these beams by increasing the ultimate strength and minimizing the deflection. From the numerical (FEM) results obtained by using ANSYS14, it is concluded that ultimate strength of castellated beam can be improved by providing spacer plate and ring stiffeners around the web hole. Also, the results showed that ultimate strength of octagonal castellated steel beam can be increased up to (53%) more than the parent beam (IPN140) with providing only (13.0%) weight of steel (spacer plate plus ring steel stiffeners).

scholarly journals Reinforcing the Octagonal Web Openings of Castellated Beam by Steel Rings

2019 ◽  
Vol 12 (1) ◽  
pp. 7-16
Author(s):  
Hayder W. Al-Thabhawee ◽  
Abbas A. Mohammed
Keyword(s):  
Failure Modes ◽  
Ultimate Load ◽  
Steel Beams ◽  
Failure Behavior ◽  
Web Openings ◽  
Finite Element Software ◽  
Steel Material ◽  
Allowable Load ◽  
Castellated Beam ◽  
The Web

Castellated steel beams are section steel members with hexagonal or octagonal web openings which they are made from standard hot rolled steel section I or H. The main advantage of these members is their economic material. An additional important advantage is a possibility to guide service ducts through the openings. The presence of the web openings influences the members’ failure behavior around the openings, new local failure modes will come into existence, such as the buckling of the web post between the openings, or yielding around the openings. Castellated beams with octagonal openings usually fail due to web post-buckling because of the increase in depth. The current study focused on improving the behavior of the castellated beam with octagonal openings using steel ring stiffener and adjusting the best dimension and distribution for the stiffeners. All the models of specimens have been fabricated from a parent I section (IPE 140). The models have been modeled and analyzed using finite element software ANSYS (version 15). The analysis results showed that reinforcing octagonal castellated beams by adding steel ring stiffeners around octagonal web opening was very active way to increase the ultimate load for long span, where the ultimate load of reinforced octagonal castellated beam increased up to (286%) compared with parent I-section beam. Economically, the percentage of additional steel material which used to expansion and reinforce the castellated beams (spacer plate and steel ring stiffeners) was (36%) when compared with the weight of parent I-section beam. While the allowable load at deflection (L/180) was (260 %) compared to the allowable load of parent section at the same deflection. The gained benefit was increasing the ultimate and allowable load of reinforced octagonal castellated beams by (186%) and (160%) respectively by using additional steel material only (36%) from the weight of parent I- section, which the additional steel material consisted from the spacer plates and steel rings. Also, the results indicate that the best dimensions for the ring were when thickness equal to the web thickness of the parent section and the width equal to the half of the parent section flange width.

Behaviour of hybrid steel beams with closely spaced web openings

2020 ◽  
Vol 22 (1) ◽  
pp. 93-100 ◽  
Author(s):  
Rujuta A. Bhat ◽  
Laxmikant M. Gupta
Keyword(s):  
Steel Beams ◽  
Web Openings

scholarly journals File Not Found: Rarity in an Age of Digital Plenty

2014 ◽  
Vol 15 (1) ◽  
pp. 68-74 ◽  
Author(s):  
Doug Reside
Keyword(s):  
Cultural Heritage ◽  
Good Deal ◽  
The State ◽  
Web Portal ◽  
Web Based ◽  
Rare Books ◽  
The One ◽  
The Web

In the first section of the submission guidelines for this esteemed journal, would-be authors are informed, “RBM: A Journal of Rare Books, Manuscripts, and Cultural Heritage uses a web-based, automated, submission system to track and review manuscripts. Manuscripts should be sent to the editor, […], through the web portal[…]” The multivalent uses of the word “manuscript” in this sentence reveal a good deal about the state of our field. This journal is dedicated to the study of manuscripts, and it is understood by most readers that the manuscripts being studied are of the “one-of-a-kind” variety (even rarer than the “rare . . .

scholarly journals Experiment and Design Method on Cold-Formed Thin-Walled Steel Lipped Channel Columns with Slotted Web Holes Under Axial Compression

2017 ◽  
Vol 11 (1) ◽  
pp. 244-257 ◽  
Author(s):  
Xingyou Yao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Ultimate Strength ◽  
Test Results ◽  
Distortional Buckling ◽  
Steel Columns ◽  
Cold Formed Steel ◽  
Thin Walled ◽  
Shell Finite Element ◽  
The Web

Background: Cold-formed steel structural sections used in the walls of residential buildings and agricultural facilities are commonly C-shaped sections with web holes. These holes located in the web of sections can alter the elastic stiffness and the ultimate strength of a structural member. The objective of this paper is to study the buckling mode and load-carrying capacity of cold-formed thin-walled steel column with slotted web holes. Methods: Compression tests were conducted on 26 intermediate length columns with and without holes. The tested compressive members included four different kinds of holes. For each specimen, a shell finite element Eigen-buckling analysis and nonlinear analysis were also conducted. The influence of the slotted web hole on local and distortional buckling response had also been studied. The comparison on ultimate strength between test results and calculated results using Chinese cold-formed steel specification GB50018-2002, North American cold-formed steel specification AISI S100-2016, and nonlinear Finite Element method was made. Result: Test results showed that the distortional buckling occurred for intermediate columns with slotted holes and the ultimate strength of columns with holes was less than that of columns without holes. The ultimate strength of columns decreased with the increase in transverse width of hole in the cross-section of member. The Finite element analysis results showed that the web holes could influence on the elastic buckling stress of columns. The shell finite element could be used to model the buckling modes and analysis the ultimate strength of members with slotted web holes. The calculated ultimate strength shows that results predicted with AISI S100-2016 and analyzed using finite element method are close to test results. The calculated results using Chinese code are higher than the test results because Chinese code has no provision to calculate the ultimate strength of members with slotted web holes. Conclusion: The calculated method for cold-formed thin-walled steel columns with slotted web holes are proposed based on effective width method in Chinese code. The results calculated using the proposed method show good agreement with test results and can be used in engineering design for some specific cold-formed steel columns with slotted web holes studied in this paper.

scholarly journals The Invasive Niche, a Multidisciplinary Concept Illustrated by Gorse (Ulex Europaeus)

2019 ◽  
Author(s):  
Anne Atlan ◽  
Nathalie Udo
Keyword(s):  
Social Factors ◽  
Global Scale ◽  
The Other ◽  
Ulex Europaeus ◽  
Explanatory Variables ◽  
Factors Influencing ◽  
Invasive Status ◽  
Noxious Weed ◽  
The One ◽  
The Web

This study analyzes the natural and social factors influencing the emergence and publicization of the invasive status of a fast growing bush, gorse (Ulex europaeus), by comparison between countries on a global scale. We used documents collected on the web in a standardized way. The results show that in all the countries studied, there are several public statuses attributed to gorse. The invasive status is the one that is most shared. The other most frequently encountered status are those of noxious weed, and of economically useful. The invasive status is publicized in nearly all countries, including those where gorse is almost absent. We quantified the publicization of the invasive gorse status of gorse by an indicator with 5 levels, and then performed a multivariate analysis that combines natural and social explanatory variables. The results lead us to propose the concept of invasive niche: the set of natural and social parameters that allow a species to be considered invasive in a given socio-ecosystem.

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