Reinforced Concrete and Steel Structures Design Help Ch-3

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Chapter 3: Design concept, Assumptions

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3.1 Concept Report and Design Parameters

3.1.1 Project Overview

The structural plan of Zone Z on the fifth floor involves a fixed reinforced concrete beam running on the horizontal direction 4 and slab panel that intersected axis 3-5 and horizontal axis A-H comprising several functional sections that include service rooms, corridors, and steam rooms up to jacuzzi facility and kids activity areas that exhibit different loading conditions that influence the structural designing model.

3.1.2 Design Philosophy

The design accounts design based on the limit state principles required by the AS3600-2009 i.e.And ultimate limit state (ULS) with respect to strength and serviceability limit state (SLS) with respect to deflection control and crack width limitation (Sadkovyi et al., 2021). The thrust of the loads and the slab panel are transferred as a continuous T-beam system, the element being a shape of a single way spanning element due to the ratio of more than 2.0.

3.1.3 Key Design Parameters

Design life 100 years structuralComponents.
Provisions in design AS3600-2009, concrete structures power, AS1170 Series, pr. loading.
ConstructionPlace it is erected in Sydney, Australia(temperate climate region).
Structural System: Cast-in-Place Thin-Frame reinforced by beam energy and Slabs, T-beams and slabs.
Fire Resistance Construction Fire rating of 2 hours.

3.1.4 Design Assumptions

Preliminary design because of the simplicity were supported beam analysis (conservative approach).
Place of tributary distributed evenly in area.
Not another colony of supports.
Tolerances in construction in line with AS3600.
The inspection and maintenance of service life done periodically.

3.2 Material Properties

3.2.1 Concrete Properties

Concrete Grade: N32

common compressive strength: f C = 32 Mpa after 28 days.
Target mean strength: f'cr = 40.5 Mpa (the safety margin being 8.5 Mpa )
Modulus elasticity: Ec 30,100 Mpa (constructed in line with AS3600 Clause 3.1.2)
Density D 2400 kg/m3 (24 kN/m3 unit weight)
Tensile strength: f'ct = 0.36√f'c = 2.04 MPa
Poisson's ratio: νc = 0.2
count Co thermal expand coefficient = 10 x 10^-6/^o

Durability Parameters:

Maximum water-cement ratio: 0.41
Minimum cement content fits 441 kg/m 3 (greater than minimum of 310 kg/m 3 in AS3600)
The maximum aggregate dimension: 25 mm (sub-angular crushed stone)

3.2.2 Reinforcement Properties

Steel Grade: D500N (Deformed bars)

Yield strength: fsy = 500 MPa
Modulus of elasticity: Es = 200,000 MPa
Density: ρs = 7850 kg/m³
Minimum bend: The AS3600 Table 13.1.2.1.
Bar sizes: N12Height: N12
general: N20 female height: N16 N28 bar size: N24

3.2.3 Exposure Classification and Cover Requirements

Class A2, Moderate exposure (interior elements of temperate climate) exposure

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Riskiness: Low to moderate carbonaton.

Minimal (interior environment) exposure

Concrete Cover Requirement:

Weight: 25 mm minimum.
R2: 20 mm minimum.
Caution over fire resistance and stability.

3.3 Loads and Load Combinations

3.3.1 Dead Loads (G)

Structural Self-Weight:

Slab (300mm thick): 24 × 0.30 = 7.2 kN/m²
T-beam stem (200mm × 250mm): 24 × 0.20 × 0.25 = 1.2 kN/m
Giving self-weight portion Half or fifth of beam self weight Adding width divisions.

Superimposed Dead Loads:

Corridor Areas:

Granite flooring (20mm): 26.4 × 0.02 = 0.53 kN/m²
Border (ornamental) marble: 0. 20 kN/ m 2.
Gypsum board ceiling (12mm): 0.13 kN/m²
Total superimposed: 0.86 kN/m²

Service Room:

Ceramic tile flooring (10mm): 0.27 kN/m²
Gypsum ceiling: 0.13 kN/m²
Total superimposed: 0.40 kN/m²

Steam Room/Jacuzzi:

Non-slip ceramic tiles: 0.30 kN/m²
Water-resistant ceiling: 0.15 kN/m²
Total superimposed: 0.45 kN/m²

Kids Room:

Ceramic tile flooring: 0.30 kN/m²
penetrated gypsum ceiling: 0.20 kN/m and this is a unfavourable result affecting to be ticking.
Total superimposed: 0.50 kN/m²

3.3.2 Live Loads (Q)

Occupancy Classifications per AS/NZS 1170.1:

Corridor (C3): 4.0kN/m 2 and 4.5kN concentrated with the earth.
Service Room (A1): The pills spread is 2.0 kN/m 2 and localisation 1.8 kN.
Steam Room/Jacuzzi (A2): dispersed 2.0 kN/m 1.8 kN concentrated.
Kids Room (A3): 4.0 kN/m 2 distributed in 2.7 Concentrated kN.

3.3.3 Special Loads

Jacuzzi Water Load:

Design water depth: 1.0 m
Water unit weight: 10 kN/m³
Liquid pressure: Flp = 10 kN/m²
Final liquid load Su = 1.2 + Flp = 12.0 kN /m 2 (AS1170.0 Clause 4.2.3)

3.3.4 Load Combinations

Ultimate Limit State (AS1170.0 Section 4):

2G + 1.5Q (fundamental combination)
LC2: 1.35G (permanent load check)
At load: 0.9G(min stablized load)

Serviceability Limit State:

LC4: G + ψsQ (short -term combination, ψs =0.7)

LC5: G +ψ lQ (long-term combination, ψs = 0.4 )

Critical Design Loads:

The maximum ULS load achieved in Jacuzzi area:{1.2(7.2 + 0.45) + 1.5(2.0 + 12.0)}/m² = 30.18 kN/m².
The LC1, LC1 with special liquid loading is controlled.

3.4 Floor Plans and Structural Elements

3.4.1 Structural Grid System

Grid Layout:

Horizontal axis: 1, 2, 3, 4, 5, 5a, 6 (Horizontal separation 3.6 -4.2m)
vertical axes A, B, C, D, E, Fg, G, H (average distance 4.1-4.9m).
Location of Zone Z: this is where the grid 3-5 meets A-H.

3.4.2 Primary Structural Elements

Continuous RC Beam (Horizontal Axis 4):

Span length: 3600mm (centre to centre supports)
Cross-section: t-psychology skimmer configuration.
Beam dimensions as illustrated below should be as follows: 500mm deep x 250mm deep web.
As3600 Clause 8.1.5.2 recommend a maximum practical flange width of 1150mm.
Effective depth: d = 500 - 25 - 16/2 = 467 mm

Slab Panel (Grid 3-5, A-H):

Plan dimensions: 3600mm × 8000mm
Aspect ratio: Ly/Lx = 8000/3600 = 2.22 > 2.0
Type: short direction one way slab.
Thickness: 300mm (satisfies L/D = 8000/300 = 26.7 ≤ 28)
Effective depth: d = 300 - 25 - 12/2 = 269 mm

3.4.3 Support Conditions

Beam supports: Pinned column (to analyse reinforced)
Slab supports: continual T- beam on two sides facing.
Constructing joints Where practicable be least moment.

3.4.4 Structural Integration

The continuous beam on the column is the dominant load-carrying medium that focuses distributed loads on slab panel on both ends of the column and they are then propagated to the column supports. The T- beam system has the best structural performance since it utilises the potential of the slab to carry negative moment zones as a compression flexural flange without affecting the web to the level of shear resistance.

The one-way span slab panel due to the high aspect ratio redistributes loads primarily in a short direction on the supporting beams (Ellobody, 2023). This makes simplicity of analysis and description integration of reinforcing much easier and gives structural adequacy to the outlined loading conditions.

Load Transfer Mechanism:

Force on the top of a slab.
Slab thickness Distribution to supporting beams.
value: Post tributary effects on the load concentrate into the beam.
Columns and transfer of foundation system.

This structural system has offered an integrated system structure within which loads are effectively distributed, not mentioning that the AS3600 standard on strength, serviceability and durability of the functional components of the different functions in Zone Z have been met.

Reference List

Journals

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