Friday 13 July 2012

DOES AN INCREASE IN THE STRENGTH OF THE STEEL THAT IS USED IN THE REINFORCEMENT IMPROVE THE MECHANICAL BEHAVIOR OF THE WALL?

For control of cracking, the strength of the steel in the reinforcement has no influence on the amount of reinforcement needed, only the area of the crosssection.
When the reinforcement is assigned a structural role, the fact the steel is stronger, does not mean necessarily that you reduce the amount of reinforcement in the same proportions. Because by the requirements of the minimum amount, in the vast majority of cases, steel does not display even half of the resistance. It is the parameter of steel reinforcement which really improves the mechanical performance in the wall, on account of its ductility, not of the resistance.

For this reason, to prevent cracking and for the transmission of forces it is preferable that the steel has a high percentage of deformation at failure (that is the parameter which determines ductility) than high resistance.

Ghas system

Tuesday 3 July 2012

IS FLATTENED LADDER TYPE REINFORCEMENT THE SAME AS ROUND TRUSS TYPE?

Having the same wire diameter should not be confused with having the same level of reinforcement. When comparing the different types of reinforcement for crack control the calculation for the amount is to do with the surface area of steel facing any vertical section of the wall.
With truss-type reinforcement there are always three wires in contact the entire length, in contrast, in a ladder type you only have two.

Therefore to meet the minimum requirements of reinforcement, comparing both types the truss type is needed less in the wall per square metre.

Furthermore when the reinforcement is assigned a structural role to withstand lateral side actions the only acceptable geometric configuration is the truss-type, for being the only non-deformable one in its own plane.

 
MASONRY REINFORCEMENT_STEEL FOR BRICKS_FISUFOR_GEOFOR_TRUSS TYPE

MASONRY REINFORCEMENT_STEEL FOR BRICKS_FISUFOR_GEOFOR_TRUSS TYPE