TY - BOOK
T1 - Product development of standardized reinforcing units
T2 - Part 1: Principles of product development and prefabricated reinforcing systems
AU - Nykyri, Pekka
AU - Nikkari, Kari
AU - Sarja, Asko
PY - 1982
Y1 - 1982
N2 - The aim of this research at VTT has been to develop the
reinforcing products for beams, columns, slabs and
footings that are suitable for industrial prefabrication.
The research is concerned with a study of the
reinforcement systems based on the reinforcing strips and
wire fabrics formed by joining the bars with longitudinal
wires together.
In the research, a new reinforcement system has been
developed. The system is suitable for prefabrication
purposes and is based on reinforcing strips joined by
welding the deformed bars together with the principles
for the appropriate product selection. The reinforcement
system includes the following:
1. The tensile reinforcing unit of a beam (reinforcing
strip)
2. The shear reinforcing unit of a beam, in which it is
included
- reinforcing unit for anchorage of tensile
reinforcement
- the shear reinforcing unit of a span(3 alternatives)
- the diagonal reinforcing unit of a span
3. The reinforcing unit of a column (reinforcing strip)
4. The reinforcing strip of a slab
5. The reinforcing strip of a wail
6. The reinforcing strip of a footing
In using these prefabricated reinforcing units the
reinforcement of a structure is composed of some of these
reinforcing units. This way it is possible to succeed in
accomplishing the flexible use of reinforcing units in
combination and good flexibility of dimensions. In
designing and fabricating the reinforcement of the
structures use can be made of reinforcing units with few
exceptions in accordance with the present authorised
specifications. This new reinforcement system makes
possible the fabrication, of all reinforcing units as
stocked items, what provides completely new fabrication
and application possibilities for the prefabricated
reinforcing unit. The share of work on site is
essentially reduced compares with in-situ reinforcement
work and the same applies to the use of present-day
prefabricated reinforcing units.
On the basis at the information gathered from the
literature and during two months' visit to the Federal
Republic of Germany by Pekka Nykyri, research officer of
the Concrete and Silicate laboratory at VTT, the
principles of a reinforcement system based on the use of
wire fabric and a proposal for a cage reinforcement
system suitable for various structural members in our
country have been presented. Wire fabric reinforcements
can be used as an alternative to bar strip reinforcements
wherever applicable.
In the research report, general features of the use of
prefabricated reinforcing units and the state of
development in this respect in different countries are
considered. In particular possibilities of improving
anchorages of tensile and shear reinforcing units of the
beams and their splicing are discuessed.
The proposed reinforcement systems still need further
development and performance studies, as well as detailed
product development and guidance on dimensioning.
AB - The aim of this research at VTT has been to develop the
reinforcing products for beams, columns, slabs and
footings that are suitable for industrial prefabrication.
The research is concerned with a study of the
reinforcement systems based on the reinforcing strips and
wire fabrics formed by joining the bars with longitudinal
wires together.
In the research, a new reinforcement system has been
developed. The system is suitable for prefabrication
purposes and is based on reinforcing strips joined by
welding the deformed bars together with the principles
for the appropriate product selection. The reinforcement
system includes the following:
1. The tensile reinforcing unit of a beam (reinforcing
strip)
2. The shear reinforcing unit of a beam, in which it is
included
- reinforcing unit for anchorage of tensile
reinforcement
- the shear reinforcing unit of a span(3 alternatives)
- the diagonal reinforcing unit of a span
3. The reinforcing unit of a column (reinforcing strip)
4. The reinforcing strip of a slab
5. The reinforcing strip of a wail
6. The reinforcing strip of a footing
In using these prefabricated reinforcing units the
reinforcement of a structure is composed of some of these
reinforcing units. This way it is possible to succeed in
accomplishing the flexible use of reinforcing units in
combination and good flexibility of dimensions. In
designing and fabricating the reinforcement of the
structures use can be made of reinforcing units with few
exceptions in accordance with the present authorised
specifications. This new reinforcement system makes
possible the fabrication, of all reinforcing units as
stocked items, what provides completely new fabrication
and application possibilities for the prefabricated
reinforcing unit. The share of work on site is
essentially reduced compares with in-situ reinforcement
work and the same applies to the use of present-day
prefabricated reinforcing units.
On the basis at the information gathered from the
literature and during two months' visit to the Federal
Republic of Germany by Pekka Nykyri, research officer of
the Concrete and Silicate laboratory at VTT, the
principles of a reinforcement system based on the use of
wire fabric and a proposal for a cage reinforcement
system suitable for various structural members in our
country have been presented. Wire fabric reinforcements
can be used as an alternative to bar strip reinforcements
wherever applicable.
In the research report, general features of the use of
prefabricated reinforcing units and the state of
development in this respect in different countries are
considered. In particular possibilities of improving
anchorages of tensile and shear reinforcing units of the
beams and their splicing are discuessed.
The proposed reinforcement systems still need further
development and performance studies, as well as detailed
product development and guidance on dimensioning.
M3 - Report
SN - 951-38-1599-4
T3 - Valtion teknillinen tutkimuskeskus. Tutkimuksia - Research Reports
BT - Product development of standardized reinforcing units
PB - VTT Technical Research Centre of Finland
CY - Espoo
ER -