Skip Navigation

Research & Publications from OSES Engineering in Ottawa
Shear Stress Prediction: Steel Fiber-Reinforced Concrete Beams Without Stirrups

American Concrete Institute - Structural Journal

 

Document Name: 108-S29

Author(s): Sam (Haisam) Yakoub

Publication: ACI- Structural Journal

Volume: 108

Issue: 3

Pages: 304-314

Keywords: absolute reduction factor; failure; geometry factor; shear stress; steel fibre-reinforced concrete; strain; volume fraction
Date: May 1, 2011

 

Abstract:

This paper develops an equation to predict steel fibre contribution to the shear strength of steel fibre-reinforced concrete (SFRC). This equation is used to modify the CSA A23.3-04 general shear design method and Bažant and Kim equations so that the modified relations safely predict the shear strength of SFRC without stirrups. This paper analyzes 218 shear failure tests previously conducted on SFRC without stirrups and 72 tests on reinforced concrete—with no stirrups and no steel fibres—to verify the applicability, accuracy, and efficiency of the two equations developed in this paper and five other equations from the literature. Furthermore, it shows that hooked steel fibres are not as efficient as crimped fibres. The round fibre is among the most efficient fibres used in those tests. Moreover, it recommends a procedure to calculate steel fibre geometry factors, another factor to evaluate engineering equations, and further research on different SFRC aspects.

 

None Rocking Seismic Isolation System for Continuous Serviceability.

 

None Rocking Seismic Isolation System for Continuous Serviceability is a seismic protection system that consists of a unique seismic bearing that does not rock horizontally but vibrates vertically slightly, where all buildings and most other structures have the dynamic capacity to resist slight vertical movements as their material resistance is higher under shortly applied dynamic loads.  Finite element analyses for a 10m x 10m x 6m high, one story building module under time history of a historical earthquake, which scaled to have max accelerations 2.0g, which returns max 0.06g horizontal response accelerations in the dynamic analyses.  In addition, the system was tested using two storeys small scale 1/10 wood model 1.5mx0.8mx1.3m height loaded with 350lbs. The model was shacked with 0.25m max displacements, with periods 0.5-0.8 sec, and the shacking lasted 60 secs. The model responses were estimated using 2 cups of water, one on top and the other on the base, where the cup on the top of the building did not spell at all. In contrast, the cup on the base spelt a few times before it overturned.

 

A complemental part of our system, is the seismic controller, which might be used as well with the existing Pendulum Bearing seismic isolators, to reduce excessive displacements, and further reduce transmitted forces, allowing using less friction of the contacted surfaces, and preventing the resonance in that device. Our system is patented US 9021751, and CA2672314 C. Our system will reduce the cost of construction spent on seismic protection and allow to reach much higher building heights with much less costs in the countries susceptible to strong earthquakes.

 

New Global Wind Power Technology 

 

Our wind power technology is a uniquely designed system that solves  all inherent problems with current wind farms. Our Wind Energy Turbine Shell Station (WETSS),  balances fluctuations, cut down surplus power losses, and avoids adverse environmental effects on habitats, to mention a few. Currently, the average amount of backup energy in current wind farms are higher than the average feed-in wind energy when connceted directly to an exisiting grid.

 

WETSS turbines are economical and easier to build. It’s easier and cheap enough to store wind energy in hydrogen generated by electrolyzing water. Wind turbines in WETSS operate in higher wind speeds and at much higher altitudes.

 

WETSS FEATURES:

Multi-level frame Structure, is a typical WETSS which has ~ 50 up to 200 stacking wind farms, one wind farm on each level


  Seismic and wind load resistant
  Easy construction from inside, no need for outside large cranes. 
  Economical design
  Sharp reduction in the required land area. 
  No noise, flicker effects, or / and danger on birds.

Reduces costs of Hydrogen to nearly $0.5 /kg of Hydrogen ($20 BOE).

 

To learn more about the features and profits of WETSS, contact us today. Our staff will be happy to help you with your needs.

Information

OSES Engineering
100 Metcalfe Street, Suite 200, Unit 353
Ottawa, Ontario, K1P 5M1

Hours

Monday - Tuesday 09:00 AM - 07:00 PM

Wednesday - Thursday 09:00 AM - 06:00 PM

Friday 09:00 AM - 05:00 PM

Saturday - Sunday Closed

Service Area

  • Ontario

  • Services Available Worldwide

Social

Send to a friend

Send the url of this page to a friend of yours

Copyright OSES Engineering 2022 - Legal
Created by

Legal notice