2. Background
In this Calculation Report the design for the structure of a resedential
home is provided by Prefabicados y Modulares de Monterry, S de R.L. DE C.
V.
For the design of this structure the following design guidelines were
considered, in accordance to the plans provided by PyMM.
1 Solid Walls and Slabs of Lightweight Concrete
2 Load Bearing Walls
3 Foundation Slabs
4 Live load of Roof of 170 kg/m2
5 Additional Dead Load of Slab of 170 kg/m2
This report is presented in a descriptive format, giving special emphasis in
describing the criteria of analysis and the designs utilized in this structure.
A annex to the main body of the report is also presented, where the results
of the computer simulations are itemized for the structural design.
2 Description of the Structure
The structuring of the home consists of prefabricated walls and slabs (figure
1), Foundation slabs. (Figure 2), Walls, slabs and Foundation Slabs are
assembled, (Figure 3), Facades (Figure 4) and a spare room can be attached on
site with solid concrete walls and slabs (Figure 5) The walls and the slab are
cast monolithicly with lightweight concrete, the foundation slab is cast
with high strength concrete and the facades are cast with lightweight
concrete.
Once cast the components are connected to form a house.
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3. 3 Dimensional View of the Slabs and Walls
3 Dimensional view of the Slab and Walls. The slab and walls are
cast monolithically with concrete with the density of 1.400kg/m3,
and with the Strength of 130kg/cm2 with a thickness of 12cm, the
walls were articulated at the bottom where it connects to the
foundation slab.
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4. 3 Dimensional View of the Foundation Slab
The foundation slab is cast with 300kg/cm2 concrete, the
supports for the slab are shown supporting the connections
with the walls of the home in its first state of load
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5. 3 Dimensional View of the Assembly
The assembly for the walls, slab and foundation slab is modeled
in what is considered in its final state, when they are assembled on
site in the model they are supported on springs whose stiffeness is
similar to the final terrain. Attached to the foundation slab.
6. 3 Dimensional View of the Facades
The Facades are simply modeled supported on the connection
points where they are attached to the wall plates of the home,
cellular concrete was used with a density of l.400/m3
7. 3. Design Criteria
For the final dimensioning of the structural elements the guidelines set by
PyMM were taken into account for the design. The criteria used in the design
are:
a) The elements of the concrete ; were carried out following the
recommendations of ACI-318-05, ACI-523.2R-96 Y ACI-213R-99
b) High strength concrete was considered with the compression strength
of 300 kg/cm2, 150 kg//cm2 and for the cellular concrete of 130kg/cm2.
c) Reinforcement steel of 4200kg/cm2 was considered.
4. Estimation of design loads and combinations
Presented below to calculate the loads considered for the design of the
structure and foundation, as well as combination of loads used in the
structural analysis.
4.1 Dead Load
It is considered the as the weight of the main structure, concrete plate, clay
block, reinforcement steel and others.
Following way:
Concept Weight (Kg/m2)
Weight of the plate (cellular concrete) 175
Weight of the plate (high strength concrete) 300
Additional Dead Load
Weight of tile and mortar 55
Weight of dividing walls 100
Weight of finishing 15
8. 4.2 Live Load
A mezzanine of three walls is considered a live load.
Live Load of 170 kg/m2
4.3 Design Combinations
Several combinations of loads were considered in the designing of the struct-
-ural elements. The basic loads used and combinations for the main structure
were included in the analysis, while the loads used for the foundations were done
separately, both combinations are shown together.
Basic Loads
Typical Load Identification in model
Dead Load (weight) Dead
Over Dead Load SD
Live Load LIVE
Combinations for the design of the superstructure
Typical Load Identification in model
DEAD + LIVE SERV
1.2 DEAD + 1.6 LIVE 12D16L
9. 5. Structural Analysis Program SAP-2K
Consideration 1
Walls and slab casted monolithically simply supported on the foundation.
SLAB
Last Moments in Slab (M11)
20. Consideration 2
Walls and Slabs cast monolithically, modeled in
conjuction with the foundation, supported on
springs.
WALL
Last moments in slab(M11)
32. Design for concrete slab M11
Maximum positive moment
General Notes
Calculation of area of steel
Maximum negative moment
General Notes
Calculation of area of steel
33. Design of concrete slab M22
Maximum positive moment
General Notes
Caculation of area of steel
39. Revision of Shear
Shear resistance of Cellular Concrete
Actual Shear
Shear Resistance
Shear resistance in high strenth concrete
Actual Shear
Shear resistance
40. Design of slab foundation M11
Maximum positive moment
General Notes
Calculating area of steel
