TOPIC 1C Flashcards
Key Factors: Material strength (compressive or tensile), length, and slenderness
Axial Force (N)
___________ cross-sectional areas are required for higher axial loads.
Larger
Key Factors: Material’s shear strength, beam depth, and span
Shear Force (V)
The member’s depth h significantly influences its ability to resist shear forces, as shear stress t = V/b(h)
Shear Capacity
_________ in depth can reduce the required width b for the member.
Increase
May be required for higher shear loads.
Shear Reinforcement stirrups
Key Factors: Moment of inertia, section modulus, and material’s flexural
strength
Bending Moment (M)
The required section modulus S is determined from the bending moment M using S = M/fy’, where fy’ is the yield strength of the
material.
Moment Capacity
___________ the depth of the beam increases the moment capacity significantly
Increasing
_________ and ________ dictate whether deeper or wider sections
are needed
Span length, load conditions
Key Factors: Polar moment of inertia and material’s shear strength.
Torsional Moment (T)
For members subjected to torsion, the ______ of the cross-section is critical
Polar Moment of Inertia (J)
Are more efficient at resisting torsion due to uniform distribution of material
Circular Sections
Provides guidelines and standards for designing structural members like beams, columns, slabs, and foundations to ensure the safety and stability of buildings.
NSCP 2015
The specific sizes of structural members
depend on factors such as?
- Load Requirements
- Span Lengths
- Building Use
- Material Strength
A general rule of thumb is that the beam depth should be _______ to _______
of the span
1/10, 1/12
For a span of ________, the beam depth would be approximately________.
4m, 400mm
Typically, the width of the beam is ______ to ______ times the depth.
0.4, 0.6
For a beam with a depth of 400 mm, the width could range from ______ to ______.
160mm, 240 mm
The minimum size for beams specified by NSCP 2015, depending on seismic
requirements (Chapter 5), generally should not be less than ________ in width
and _______ in depth, especially for buildings in seismic zones
200mm, 400mm
For low-rise buildings (1 to 3 stories), a column size of _______ is commonly used
300mm x 300mm
For medium to high-rise buildings (4 to 10 stories or more), column sizes typically range from ________ to ________ or larger, depending on the loading and building height.
400mm x 400mm, 600mm x 600mm
The minimum column dimension in
seismic zones is typically _______.
300mm
Columns should have at least ___ longitudinal bars for square or rectangular columns and at least ___ longitudinal bars for circular
columns.
4, 6
Typically, the thickness is L/20, where L is the shorter span
One-Way Slabs
For a 4-meter span, the slab thickness would be around _______.
200mm
Typically, the thickness is L/30, where L is the longer span
Two-Way Slabs
For a _______ span, the slab thickness could be around 200 mm or more.
6 meter
For residential floors, a minimum thickness of ______ (5 inches) is common.
125mm
For commercial floors with higher live loads, slab thickness could range from _____ to ____ (6 to 8 inches) or more depending on the load
150mm, 200mm
Typically, the minimum thickness of footings is _______ (12 inches), but the size depends on the soil bearing capacity and column load.
300mm
For heavier loads or poor soil conditions, combined footings or mat foundations may be required, with thicknesses ranging from ____ to _____ or more.
500mm, 1000mm
