PROPOSED 2-STOREY COMMERCIAL BUILDING @ Block 3, Puntod, Cagayan de Oro City
STRUCTURAL ANALYSIS AND DESIGN CRITERIA
Code and Specification The following structural codes and specification shall be used in the structural analysis and design of the reinforced concrete special moment resisting 2-storey residential building. 1.) National Structural Code of the Philippines 2015, Volume 1, 7th edition – Generally for the entire Analysis and Design Requirements. 2.) American Standard for Testing and Materials (ASTM)
Material Strength The following material strengths shall follow the specification used for the 2-storey building i.e. Material Properties Minimum Concrete Compressive Strength, (fc’) Columns:
fc’ = 3000 psi (21 MPa)
Beams:
fc’ = 3000 psi (21 MPa)
Slabs:
fc’ = 3000 psi (21 MPa)
Footing:
fc’ = 3000 psi (21 MPa)
Reinforcement steel bars shall be deformed and shall conform to ASTM 615
Main bars, (16mm or larger)
fy = 276 MPa (Grade 40) fy = 414 MPa (Grade 60)
Secondary bars, (12mm>)
fy = 228 MPa (Grade 33)
Loads Design loads and forces are those resulting from self-weight of the building including all other permanent loads referred to us the dead loads. Occupancy or non-permanent loads referred to as the live loads, and earth quake loads as sometimes called as seismic loads acting in most critical combinations using the appropriate load factors as recommended by the governing National Structural Code of the Philippines (NSCP2015).
Dead Loads – consist of the weight of all materials of construction incorporated into the building or other structure, including but not limited to walls, floors, roofs, ceilings, stairways, built-in partitions, finishes, cladding and other similarly incorporated architectural and structural items, and fixed service equipment, including the weight of cranes.
It must confirm to; Table 204-1 (Minimum Densities for Design Loads from Materials (kN/m³) of NSCP 2015 Table 204-2 (Minimum Design Dead Loads (kPa) of NSCP 2015
Live Loads – shall be the maximum loads expected by the intended use or occupancy but in no case shall be less than the loads required by the tables below;
Table 205-1 (Minimum Uniform and Concentrated Live Loads) of NSCP 2015
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 co untry generally falls in a high seismic-risk zone.
Occupancy Category: Essential Occupancy
Table 103-1 of Section 103
Occupancy Importance Factor: I = 1.5
Table 208-1 of Section 208.4.2
Nearest Source Factor: 16.0 kM Nearest to Tagoloan River Fault Near Source Factor, Na & Near Source factor, Nv Table 208-5, Table 208-6
Seismic Source Type:
A
Faults with Max Moment Magnitude, M
See table 208-4 of NSCP2015 7.0 ≤ M ≤ 8.4
Soil Type must confirm to table 208-2 of NSCP 2015 7 th edition
Rw:
8.5
Structural system numerical coefficient representative of the inherent over-strength and global ductility capacity for Concrete Moment Resisting Space Frame system. Table 208-11A of NSCP 2015 7th edition.
LOAD COMBINATION
As per section 203.3.1 of NSCP 2015 7th Edition D = dead load E = earth quake load set forth in Section 208.6.1 Em = estimated maximum earth quake force that can be developed in the structure as set forth in Section 208.6.1 F = load due to fluid with well-defined pressures and maximum heights H = load due to lateral pressure of soil and water in soil L = live load, except roof live load, including any permitted live load reduction P = ponding load R = rain load T = self-straining force and effects arising from contraction or expansion resulting from temperature change, shrinkage, moisture change, creep in component materials, movement due to differential settlement, or combination thereof W = load due to wind pressure
