Seismic plastic–damage analysis of mass concrete blocks in arch dams including contraction and peripheral joints

2017 ◽  
Vol 95 ◽  
pp. 118-137 ◽  
Author(s):  
Omid Omidi ◽  
Vahid Lotfi
Keyword(s):  
Mass Concrete ◽  
Damage Analysis ◽  
Arch Dams ◽  
Plastic Damage ◽  
Concrete Blocks

Prediction of edge cracks and plastic-damage analysis of Mg alloy sheet in rolling

2011 ◽  
Vol 21 (5) ◽  
pp. 1112-1117 ◽  
Author(s):  
Ding-fei ZHANG ◽  
Qing-wei DAI ◽  
Lin FANG ◽  
Xing-xing XU
Keyword(s):  
Alloy Sheet ◽  
Mg Alloy ◽  
Damage Analysis ◽  
Plastic Damage ◽  
Edge Cracks

Prediction of Inelastic Behavior of Composite Laminates Using Multi-Surface Continuum Damage-Plasticity

2008 ◽  
Vol 47-50 ◽  
pp. 773-776 ◽  
Author(s):  
Bijan Mohammadi ◽  
Hossein Hosseini-Toudeshky ◽  
Mohammad Homayoun Sadr-Lahidjani ◽  
Shahram Aivazzadeh
Keyword(s):  
Composite Laminates ◽  
Damage Mechanics ◽  
Failure Load ◽  
Internal Variable ◽  
Damage Analysis ◽  
Continuum Damage ◽  
Inelastic Behavior ◽  
Surface Plasticity ◽  
Plastic Damage ◽  
Failure Loads

The recently performed investigations in continuum plastic-damage analysis of composite laminates by the authors showed that using a single hardening internal variable for damage and plasticity surfaces may prone to significant errors in response and failure load for some lay-ups. In this paper, the new technique of coupled continuum plastic-damage mechanics including multisurface dissipation potentials are employed to improve the results. The response and failure loads of the laminated composites with different lay-ups are predicted using elastic, damage, and damageplasticity conditions with single and multi surface plasticity and compared with the available experimental results.

Performance Based Specifications for Durability of Mass Concrete Blocks Subjected to Harsh Arabian Gulf Marine Environment

2016 ◽  
Vol 711 ◽  
pp. 444-452
Author(s):  
K. Rahman Muhammad ◽  
Al Omran Zaki ◽  
Ibrahim Mohammed ◽  
Al Nahdi Fahad ◽  
S. Barry Mohammed
Keyword(s):  
Service Life ◽  
Arabian Gulf ◽  
Concrete Structures ◽  
Experimental Investigations ◽  
Eastern Region ◽  
Mass Concrete ◽  
Reinforcing Steel ◽  
Concrete Blocks ◽  
Durability Performance

Concrete structures in the Eastern region of Saudi Arabia are exposed to the harsh Arabian Gulf environment, and they suffer from deterioration due to accelerated corrosion of the reinforcing steel resulting in reduced service life. The service life of reinforced concrete structures in this environment is strongly affected by the quality of concrete. The resistances of concrete to chloride penetration, the chloride threshold for corrosion initiation and corrosion rate of the reinforcing steel are critical in ensuring long-term durability of concrete structures. In order to ensure that the concrete functions in the harsh environment for which it is expected to meet the service life requirement, the concrete must be designed for durability performance. A prescriptive concrete specification emphasizing on limits on mix parameters is generally ineffective for durability issues. A performance based specification based on concrete quality represented by durability indices and compliance criteria measured on cast-in-place concrete provides a framework for the contractor and ready-mix concrete supplier to produce a structure meeting the stipulated service life by the client. This paper presents the results of experimental investigations conducted for mass-concrete blocks used in the quay walls off the coastline on a reclaimed land. For long-term durability, a concrete mix in which 50% and 70% of cement was replaced by ground blast furnace slag was used to cater for the durability performance requirements.

Perméabilité in situ du béton de peau, établie à partir de la percolation d'un gaz en régime d'écoulement permanent

2002 ◽  
Vol 29 (3) ◽  
pp. 360-368 ◽  
Author(s):  
Daniel Perraton ◽  
Alan Carter ◽  
Michel Vaillancourt ◽  
Bruno Lavoie
Keyword(s):  
Superficial Layer ◽  
Mass Concrete ◽  
Construction Site ◽  
Intrinsic Permeability ◽  
Apparent Permeability ◽  
Long Time ◽  
Concrete Blocks ◽  
The Relationship ◽  
Established Technique

In an attempt to apply the concepts developed by Carman and Klinkenberg for the measurement of permeability of a porous media using a gas, a permeameter for the in-situ measurement of intrinsic permeability of skin concrete has been developed. The established technique allows concentration of gas percolation through a well-defined zone in the superficial layer of concrete. The instrument, the measurement method, and the calculation procedure are described in details in this paper. Several series of tests have been performed in laboratory on concrete blocks (300 × 300 × 400 mm) to simulate measurements on the construction site. Three types of concrete, with different porosity, have been tested. The measurement of permeability performed on the concrete blocks have been accomplished both on shaped surfaces, which are representative of skin concrete, and on sawed surfaces, which are representative of mass concrete. Results show that the relationship between the water/cement ratio and the permeability of skin concrete varies distinctively compared with that of mass concrete. The permeameter allows quantification of what has been for a long time qualified as a determining element in terms of the durability of concrete against the corrosion of reinforcement, that is, the distinct permeability of skin concrete from that of mass concrete.Key words: skin concrete, in-situ permeability, intrinsic permeability, apparent permeability, permeameter, Klinkenberg.[Journal translation]

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