building design 2_lecture 2

7/28/2019 Building Design 2_lecture 2

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CE 42: Building Design 2

Lesson 2: Structural Plans and

Details, including Stairs and Slab


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Seatwork

1. Using the Volume Method find the required

number of Cement bags, volume of sand andvolume of gravel for:

100 pcs. of Plinth Footing

Use Class A Mixture.


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Metal Reinforcement/Steel Bars Most widely used reinforcing materials for

almost all types of concrete construction An excellent partner of concrete in resisting

both tension and com ression stresses.

Steel is ten times stronger than concrete inresisting compression and hundred timesstronger in tensile strength

Estimate on the number of pieces isdetermined by Direct Counting.


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Bar Splice, Hook and Bend

Splice or overlapping are provided between

two adjacent bars in order to maintain therequired continuity of stress in the splice zone.

length is in adequate for full development.


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Type of Metal Reinforcement

A. Foundation or Footing reinforcements

1. Footing Slab reinforcement for small and

medium size footings.

. , , .

3. Beam reinforcement for medium construction

4. Beam and Slab for large construction

5. Stirrups


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B. Post and Column Reinforcements

1. Main Vertical reinforcement

a. Single or

b. Bundled bars2. Lateral Ties

a. Outer ties

b. Inner ties

c. Straight ties

3. Spiral Ties for Circular Column4. Dowels for partitions and other futureattachments


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C. Beam and Girder Reinforcement

1. Main Reinforcementa. Straight bars

b. Bend bars

c. Additional cut bars for tension and compressiond. Dowel bars for future attachment

2. Stirrups

a. pen st rrupsb. Closed stirrups

c. Straight stirrups or ties

3. Cut Bars

a. Over and across the support

b. between supports

c. Dowels and hangers for ceiling and partition


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D. Floor Slab Requirement

1. Main reinforcements

a. straight main reinforcing bars extendingfrom one beam to the other

b. alternate main reinforcing bars with bendbetween and over the beam support

c. main alternate bars over su ort beam or

girder)2. temperatures bars tied perpendicular to themain reinforcement

3. Additional alternate cut bars over the support(beam)

4. Dowels and hangers for ceiling and other

attachment


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E. Concrete Hollow Block reinforcement (refer totopics on Masonry Reinforcement)


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Procedures in Estimating Steel Bar

Reinforcement1. Main reinforcement-by direct counting

2. Note formulas for splice, hooks and bends3. Stirrups and lateral ties should be treated

separately. Taking consideration of again their

4. Choose the best available commercial length forthe minimum wastage.

5. Length of tie wire should be cut to a minimumrequired length based the diameter of the barsto be tied on.


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Foundation Bars by First Method Dividing the commercial length with one cut

bar and the answer is fractional

Foun ation Bars y Secon Met o

Dividing the commercial length with one cut

bar and the answer is a whole number


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Solving for Tie Wire1. Determine the number of ties

2. (Number of Ties) x (Length Ties) = ______m

/53 = _____kls of G.I. Wire # 16


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Column Reinforcement (Longitudinal

Bars)

Use direct counting but note the following:

1. bend at the base footing

2. length from footing to ground floor

3. height from ground line to beam4. depth of beam

5. thickness of the floor slab6. dowel for second floor


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Lateral ties(columns) and Stirrups

(beams and girders)

Refer to the plan for spacing, from that, we

can obtain the number of lateral ties orstirrups

,

Tie Wire


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Spiral and Column Ties Consider the pitch. And use Table 3-9

Tie Wire


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Slab (Slab on Grade or Ground floor

slab)

To be treated similar to Foundation

reinforcement

building design 2_lecture 2

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