Design Criteria

July 5, 2018 | Author: angelica buton | Category: Earthquakes, Structural Load, Earthquake Engineering, Reinforced Concrete, Concrete
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Two storey design criteria...

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Project: Two-Storey with Roof Deck Commercial Building Location: Zone 9, Carmen, Cagayan de Oro City

Design Criteria A. Reference Code: The following structural codes and specifications shall be used in the structural analysis and design of the reinforced concrete special moment resisting 2 –storey with roof deck commercial building. 1. National Structural Code of the Philippines 2015, NSCP2015, Volume 1 –Generally for the entire Analysis and Design Requirements.

B. Material Strengths: Material Properties: Minimum Concrete Compressive Strength, fc ’

Columns

fc’= 21MPA (3000psi)

Beams

fc’= 21MPA (3000psi)

Slabs

fc’= 21MPA (3000psi)

Footing

fc’= 21MPA (3000psi)

Reinforcing steel bars shall be deformed and shall conform to ASTM 615

Main Bars (16mm or larger)

fy = 276MPA (Grade 40)

Secondary Bars (less than 12mm)

fy = 228MPA (Grade 33)

C. Loads Loads are forces or other actions that result from the weight of all building materials, occupants and their possessions, environmental effects, differential movements, and restrained dimensional changes. Permanent loads are those loads in which variations over time are rare or of small magnitude. All other loads are variable loads.

1. Dead Loads: Dead loads consist of the weight of all materials and fixed equipment, incorporated into the building of other structure.

1.1 Unit Weight of Concrete

23.6KN/m3

1.2 Walls 4” CHB Walls

21.2 KN/m3

1” Thk Plaster on both faces

0.48 KPa

Full grout

2.84 KPa

1.3 Floor Finishes

Ceramic or Quarry Tile on

0.77 KPa

13 mm mortar bed

1.4 Ceiling Finishes Gypsum Board (per mm thickness)

0.008 KPa

2. Live Loads: Live loads are those loads produced by the use and occupancy of the building or other structure and do not include dead load, construction load, or environmental loads.

2.1 Typical Floors

4.8 KPa

2.2 Roof Deck

4.8 KPa

D. Seismic Loads: The vibratory ground motion caused by the earthquake can have damaging effects on structure and can even lead to collapse. It is extremely important to consider seismic effect in the design of the building in the Philippines because of the fact that the country generally falls in a high seismic-risk zone. NSCP2015 Section 208 provides a general procedure in dealing with Seismic loads which is patterned from the Uniform Building Code. The structure limitations and design is guided with seismic zoning, field characteristics, occupancy and structural configuration. Below are the Seismic analysis parameters for calculation of the lateral seismic forces on the building structure:

1.1 Occupancy Category

Category IV Standard Facilities (NSCP2015 Table 208-1 Section 208)

1.2 Occupancy Importance Factor, I 

Commercial Building (I= 1.0)

1.3 Seismic Zone Factor, Z= 0.40

NSCP2015 Fig.208-1 (Reinforced Seismic Map

of the Philippines)

1.4 Seismic Source Type

Type A

1.5 Near Source Factor

19.9 Km Nearest to Tagoloan River Fault

Near Source Factor, Na

NSCP2015 Table 208-5

Na= 1.0

Near Source Factor, Nv

NSCP2015 Table 208-6

Nv=1.0

1.6 Seismic Resistance Factor Moment-Resisting Frame Structure: Special Reinforced Concrete Moment

Frames Seismic Resistance Factor: 8.5

1.7 Seismic Coefficients , Ca  and  and Cv Z = 0.4 Ca = 0.44Na Cv = 0.44Na

NSCP2015 Table 208-11A

NSCP2015 SECTION 208.4.4.4

E. Design Load Combinations 1.4 Dead Load 1.2 Dead Load + 1.6 Live Load a 1.2 Dead Load + 1.6 Live Load b 1.42 Dead Load + 1.0 Live Load a + 1.25 Earthquake Load r 1.42 Dead Load + 1.0 Live Load b + 1.25 Earthquake Load r 1.42 Dead Load + 1.0 Live Load a + 1.25 Earthquake Load l 1.42 Dead Load + 1.0 Live Load b + 1.25 Earthquake Load l

F. Foundation Soil The allowable soil bearing capacity of the site can be as high as 125 kpa. Contractor shall conduct the necessary soil exploration to determine the configuration of the soil and to design appropriate foundation of the building.

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