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Reinforcement Drawings for Concrete Slabs

CEDRUS-5 is the most popular program for analysis and design of concrete slabs. It handlesgeneric geometry slabs, with holes, compact or hollow, supported on any layout of linear and point

supports, using the finite element method. The loads may also be generic, distributed, linear or

point, placed at any position on the slab. The finite element mesh is created fully automaticaly and

in zero time we get results for diplacements, reactions, section forces, and reinforcement.

Reinforcement requirement results are produced everywhere on the slab, for the desired

direction, in cm2per meter width or additionaly along section zones, so that the slab is reinforced

in zones with uniform distribution of the concentrated moments, that appear in point supports or

corners of the slab. The only thing missing for a coplete automatic design of the slab is the drawing

of the reinforcement bars on the formwork of the slab, and this is what CEDRUS-5H does.

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CEDRUS-5 model is created fully automatic

and the engineer has only to input the loads.

Furthermore the engineer may define in

ACAD the way the basic upper and lower

reinforcement will be cut, i.e. per span or

continuous over several spans.

Model generation

CEDRUS-5H reads the formwork geometry

from ACAD and generates the model of the

exact geometry of the slab.

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Basic Reinforcement

In CEDRUS-5, according to the calculation

results, the basic reinforcement quantities are

given in cm2/m per slab area. The decision for

the final quantity lies on the engineer and comes

from a visual check of reinforcement isolines

results, as it was happening manually till now

during CEDRUS-5 analysis. The engineer

maintains the advandage to allow localy some

moment peaks, as he did manually.

The engineer may also apply uniform basic

reinforcement to simplify the construction. In

some cases he may apply more basic

reinforcement to undertake forces that dont

appear in this specific analysis under vertical

loads, such as temprature loads, superimposed

loads, or minimum required reinforcement. In

general, basic reinforcement may easily be

modified by the engineer per span, in cm2/m

width upper, lower, in x direction, in y direction,

for given covers and angle.

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Envelopes, Results

We exit CEDRUS-5 after automatic transfer of

the reinforcement results for several limit states:

Servicability-frequent,

Servicability-quasi permanent,

Servicability-occasional and

Ultimate Limit State

which are automatically created or for limit statesdefined by the engineer via envelopes menu of

CEDRUS-5.

Additional Reinforcement

For the calculation of additional upper reinforce-

ment CEDRUS-5H automatically generates

section zones over all supports, linear or point.

The engineer may modify those or define new

section zones. Therefore placement of the

additional reinforcement has two advantages:

The calculation is based on section zones,

so we avoid the problem of concentrated

moments and therefore achieve more

economical solution.

They are generated automatically by the

program, the engineer can modify their

position and dimensions.

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Generation of Reinforcement Bars

CEDRUS-5H generates reinforcement bars and

prepares drawings for ACAD. First we select

the desired bar diameters and distances and

whether to respect or not the minimum

reinforcement requirements of the Code.

Then, completely automatic, the proposed

basic reinforcement appear on the screen

according to the engineers decisions in

CEDRUS-5.

Through Check we get the exploitation factor

on every reinforcement position to evaluate the

economy of the solution. Exploitation factor is

defined as the ratio of required (calculated) over

available reinforcement. Exploitation factor

serves for the evaluation of the strength andeconomy of reinforcement.

Together with the evaluation of deformations in

CEDRUS-5, they form a key criterium for the

selection of the thickness of the slab.

The minimum proposed additional reinforcement

are also automatically produced on the screen,

according to the reinforcement requirements of

section zones of CEDRUS-5. Through Check

the program returns the exploitation factor of the

minimum proposed reinforcement. Through

Design the program automatically proposes

diameter and distance for every reinforcement

position.

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Automatic production of formwork

drawings for ACAD

Previewing the formwork drawing for ACAD the

angineer can define drawing titles, assumptions,

legend, drawing border, paper, scale, text sizes

and it is ready to export to ACAD.

You may add or modify everything you desire in

ACAD. Though, there is not much to do since

the drawing is automatically produced in a high

level of completeness.

Even the aesthetic and readability of the

drawing may be improved by the engineer, since

the reinforcement bar and its distribution line

may be modified through corresponding

parameters of the attributes form of the

reinforcement position.

Every solution produced by Design is

registered to a reinforcement list. The list can

be activated and further modified by the

engineer.

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cubus Hellas LtdSoftware Consulting Services

CUBUS HELLAS Ltd . 7 154 51 . : (210) 6722 360 366 389 FAX : (210) 6722382

e-mail: cubus@ath.forthnet.gr www.cubushellas.gr

Bar Lists in EXCEL

The program also exports Bar Lists to EXCEL

ready to order. The exact weight of straight

length and bended bars is written in the lists and

through that you may have another estimation

of the economy of the solution.