Architecture – Complete Study Notes

Introduction

Architecture is the science and art of planning, designing and constructing buildings that satisfy functional, structural, environmental, aesthetic and social requirements. An architect combines engineering principles with artistic creativity to create safe, sustainable and comfortable built environments.

The profession involves planning residential, commercial, institutional, industrial and public buildings while considering climate, culture, economy, safety and legal regulations.

Major topics asked in TNPSC CTS include: Building Planning, Building Materials, Construction Technology, Structural Basics, Climatology, Building Services, Estimation, Town Planning, Landscape Architecture, Green Buildings, National Building Code (NBC), Building Bye-laws and Architectural History.

1. Principles of Building Planning

Building planning is the arrangement of rooms and spaces according to functional requirements.

Important Principles

• Aspect – Arrangement of rooms according to sunlight. Example: Kitchen – East, Bedroom – South/West, Living Room – North/East. Advantages: Better daylight, reduced electricity, healthy indoor environment.
• Prospect – Good external views from windows and balconies. Example: A park-facing living room is preferred over facing a garbage yard.
• Privacy – Two types: External Privacy (protection from outsiders) and Internal Privacy (between family members). Methods: Proper room arrangement, compound walls, screens, landscaping.
• Grouping – Related rooms should be located together. Example: Kitchen near dining room, bedroom near attached toilet.
• Roominess – Creating a spacious feeling without increasing area. Methods: Larger windows, proper lighting, open planning, light colours.
• Orientation – Positioning the building according to sun and wind direction. Objectives: Reduce heat gain, improve ventilation, save energy. In India, east-west orientation is generally preferred depending on climate.
• Circulation – Movement inside buildings. Two types: Horizontal circulation and Vertical circulation. Examples: Corridors, stairs, lifts, ramps. Good circulation reduces travel distance.
• Elegance – Beauty achieved through proportion, balance, colour, texture and materials.
• Flexibility – Spaces should allow future modifications. Example: Movable partitions.
• Economy – Planning should minimize construction and maintenance cost without reducing quality.

2. Building Components

Foundation

Lowest part of the building transferring loads safely to soil. Functions: Stability, prevent settlement, resist moisture, transfer loads.

• Shallow Foundation: Strip footing, Isolated footing, Combined footing, Raft foundation.
• Deep Foundation: Pile foundation, Caisson foundation.

Plinth

Portion between ground level and floor level. Functions: Prevent dampness, raise building above ground, improve appearance.

Damp Proof Course (DPC)

Layer preventing moisture from rising. Materials: Bitumen, Asphalt, Cement concrete, PVC membrane.

Walls

Vertical structural members. Types: Load-bearing walls, Partition walls, Cavity walls, Retaining walls, Shear walls.

Columns

Vertical members transferring loads. Materials: RCC, Steel, Timber, Stone.

Beams

Horizontal members supporting slabs. Types: Simply supported, Cantilever, Continuous, Fixed beam.

Slabs

Flat horizontal structural members. Types: One-way slab, Two-way slab, Flat slab, Ribbed slab, Waffle slab.

Roof

Topmost protective covering. Types: Flat roof, Pitched roof, Shell roof, Dome roof, Folded plate roof.

Doors

Functions: Access, Security, Privacy, Ventilation. Types: Battened door, Flush door, Panel door, Sliding door, Folding door, Revolving door, PVC door, Glass door.

Windows

Purpose: Lighting, Ventilation, View. Types: Casement, Sliding, Fixed, Pivoted, Bay, Dormer, Clerestory, Skylight, Louvered.

Stairs

Means of vertical movement. Components: Step, Rise, Tread, Landing, Handrail, Stringer. Types: Straight, Dog-legged, Open well, Spiral, Helical, Bifurcated.

Ramps

Used for barrier-free movement. Recommended slope: 1:12. Essential for universal accessibility.

3. Building Materials

Stone

Properties: Hardness, Durability, Strength, Weather resistance. Uses: Foundations, Masonry, Flooring, Monuments. Types: Granite, Basalt, Sandstone, Limestone, Marble.

Bricks

Made from burnt clay. Standard modular size: 190 × 90 × 90 mm. Advantages: Durable, Fire resistant, Economical. Types: First class, Second class, Third class, Fourth class.

Cement

Binding material. Ingredients: Limestone, Clay, Gypsum. Types: OPC, PPC, Rapid hardening cement, Sulphate resisting cement, White cement, Low heat cement.

Lime

Types: Fat lime, Hydraulic lime, Poor lime. Uses: Mortar, Plaster, Whitewashing.

Sand

Fine aggregate. Types: River sand, Manufactured sand (M-Sand), Pit sand. Properties: Clean, Well graded, Free from organic matter.

Aggregates

Types: Fine aggregate, Coarse aggregate. Uses: Concrete preparation.

Concrete

Mixture of Cement, Sand, Aggregate and Water. Grades: M10, M15, M20, M25, M30, M35, M40. Important properties: Workability, Strength, Durability, Impermeability.

Steel

Advantages: High tensile strength, Ductility, Weldability, Recyclable. Types: Mild steel, HYSD bars, TMT bars.

Timber

Common species: Teak, Sal, Deodar, Pine. Defects: Knots, Warping, Cracks, Decay.

Glass

Types: Float glass, Toughened glass, Laminated glass, Reflective glass, Insulated glass. Uses: Curtain walls, Windows, Facades.

Aluminium

Advantages: Lightweight, Corrosion resistant, Recyclable. Uses: Doors, Windows, Curtain walls.

Plastics

Types: PVC, UPVC, Acrylic, Polycarbonate. Applications: Pipes, Doors, Roof sheets, Water tanks.

4. Building Construction

Brick Masonry

Common bonds: English bond, Flemish bond, Stretcher bond, Header bond. English bond is the strongest.

Stone Masonry

Types: Rubble masonry, Ashlar masonry.

Flooring

Types: Cement concrete, Mosaic, Granite, Marble, Ceramic tiles, Vitrified tiles, Wooden flooring. Properties: Durable, Non-slippery, Easy maintenance.

Plastering

Purpose: Smooth surface, Weather protection, Decoration. Common thickness: 12–20 mm.

Pointing

Finishing mortar joints. Types: Flush, Recessed, V-shaped, Weathered.

Painting

Functions: Protection, Decoration. Types: Distemper, Emulsion, Enamel, Cement paint, Acrylic paint.

Formwork

Temporary mould for concrete. Requirements: Strong, Leakproof, Easy removal, Economical. Materials: Timber, Steel, Aluminium, Plastic.

Scaffolding

Temporary support for workers. Types: Single, Double, Steel, Suspended, Cantilever.

5. Basic Structural Concepts

• Dead Load – Permanent load due to self-weight.
• Live Load – Movable load from occupants and furniture.
• Wind Load – Horizontal force due to wind.
• Earthquake Load – Dynamic force generated during earthquakes.

6. National Building Code (NBC)

NBC provides standards for planning, design and construction. Objectives: Public safety, Structural safety, Fire safety, Accessibility, Sustainability.

Major Parts: Administration, Development Control, Fire Safety, Structural Design, Building Services, Plumbing, Electrical Systems, Sustainability, Accessibility, Construction Management.

7. Building Bye-laws

Prepared by local authorities. They regulate: Plot coverage, FAR/FSI, Building height, Setbacks, Parking, Ventilation, Open spaces, Drainage.

Purpose: Planned urban development, Public health, Safety, Environmental protection.

8. Climatology and Environmental Design

Climatology is the study of climate and its influence on buildings. Climate-responsive architecture reduces energy consumption while improving occupant comfort.

Climatic Elements

• Temperature
• Solar radiation
• Rainfall
• Humidity
• Wind direction and speed
• Cloud cover

Indian Climatic Zones

• Hot and Dry (Rajasthan, Gujarat) – High daytime temperature, low humidity. Design: Thick walls, courtyards, small windows, light-coloured exterior.
• Warm and Humid (Chennai, Kochi) – High humidity, heavy rainfall. Design: Large openings, cross ventilation, sloping roofs, verandahs.
• Composite Climate (Delhi, Lucknow) – Experiences all major seasons. Buildings should combine features suitable for different weather conditions.
• Cold Climate (Himachal Pradesh, Kashmir) – Design: Compact buildings, small windows, insulated roofs, south-facing openings.
• Moderate Climate (Bengaluru, Pune) – Pleasant climate throughout the year. Simple passive design techniques are generally sufficient.

Passive Design Techniques

Passive design minimizes energy use without mechanical equipment. Methods: Proper orientation, Natural ventilation, Courtyards, Shading devices, Thermal insulation, Roof gardens, Double glazing, Vegetation.

Advantages: Lower electricity bills, Better indoor comfort, Reduced environmental impact.

9. Building Services

Building services make buildings functional, safe and comfortable.

Water Supply System

Components: Source, Pump, Underground sump, Overhead tank, Distribution pipes, Fixtures. Common Plumbing Materials: PVC, CPVC, GI pipes, Copper, HDPE.

Sanitation

Purpose: Safe disposal of wastewater, Public hygiene, Disease prevention. Components: Soil pipe, Waste pipe, Vent pipe, Manhole, Inspection chamber, Septic tank, Sewer.

Septic Tank

Used where underground sewer systems are unavailable. Functions: Settles solids, Anaerobic decomposition, Partial treatment before disposal.

Rainwater Harvesting

Collection and storage of rainwater. Methods: Rooftop collection, Recharge pits, Percolation wells, Recharge trenches. Advantages: Groundwater recharge, Reduced flooding, Water conservation.

Electrical Services

Main Components: Transformer, Main panel, Distribution board, Wiring, Switches, Earthing. Types of Wiring: Concealed, Surface, Conduit, Casing and capping.

Earthing

Purpose: Prevent electric shock, Protect equipment, Safe fault current discharge.

HVAC

Heating, Ventilation and Air Conditioning. Functions: Thermal comfort, Indoor air quality, Humidity control. Types: Window AC, Split AC, Packaged units, Central HVAC.

Fire Protection

Active Systems: Sprinklers, Fire extinguishers, Smoke detectors, Fire alarms, Hose reels, Hydrants. Passive Systems: Fire-resistant walls, Fire doors, Fire escape staircases, Smoke barriers.

Types of Fire Extinguishers: Water, Foam, CO₂, Dry Chemical Powder, Clean Agent.

10. Universal Design and Accessibility

Universal design ensures buildings are usable by everyone. Important Features: Ramp (1:12 slope), Lift, Handrails, Tactile paving, Wheelchair turning space, Accessible toilets, Wider doors, Braille signage.

Advantages: Inclusive environment, Safe movement, Barrier-free access.

11. Town Planning

Town planning is the systematic development of urban and rural areas. Objectives: Healthy environment, Efficient transport, Controlled development, Public welfare, Environmental protection.

Principles: Land use zoning, Road hierarchy, Open spaces, Utility services, Public amenities.

Land Use Categories

Residential, Commercial, Industrial, Institutional, Recreational, Agricultural.

Road Pattern Types

Grid iron, Radial, Radial and circular, Linear, Hexagonal.

Smart City Concept

Characteristics: Digital governance, Sustainable transport, Energy-efficient infrastructure, Smart water management, Waste management, Public Wi-Fi, Intelligent traffic systems.

12. Housing

Housing provides safe and healthy living conditions. Types: Individual house, Apartment, Row house, Group housing, Affordable housing.

Characteristics of Good Housing: Ventilation, Lighting, Sanitation, Safety, Privacy, Accessibility, Durability.

13. Landscape Architecture

Landscape architecture deals with planning outdoor spaces. Elements: Trees, Shrubs, Lawn, Water bodies, Walkways, Lighting, Seating, Sculpture.

Functions: Beautification, Climate control, Recreation, Biodiversity, Soil conservation.

14. Green Buildings

Green buildings minimize environmental impact. Objectives: Save energy, Save water, Reduce waste, Improve indoor environment, Lower carbon emissions.

Major Features: Solar panels, Rainwater harvesting, Efficient lighting, Efficient HVAC, Waste recycling, Natural ventilation, Green roofs, Sustainable materials.

• LEED – Leadership in Energy and Environmental Design. International green building certification.
• GRIHA – Green Rating for Integrated Habitat Assessment. India's national green building rating system.
• ECBC – Energy Conservation Building Code. Improves energy efficiency in commercial buildings.

15. Sustainable Architecture

Sustainable architecture balances environmental, economic and social needs.

Principles: Reduce energy consumption, Renewable energy, Local materials, Recycled materials, Water conservation, Waste reduction, Long building life.

16. Disaster Resistant Construction

Buildings should resist natural disasters.

Earthquake Resistant Measures

Symmetrical plan, Strong foundation, Shear walls, Ductile detailing, Reinforced concrete frames, Lightweight roof.

Cyclone Resistant Measures

Strong roof connections, Wind-resistant windows, Proper anchoring, Aerodynamic roof shapes.

Flood Resistant Measures

Raised plinth, Proper drainage, Waterproof materials, Elevated utilities.

17. Building Acoustics

Acoustics is the science of sound control. Objectives: Clear speech, Noise reduction, Comfortable environment.

Methods: Acoustic ceiling, Sound-absorbing panels, Double glazing, Thick walls, Carpets, Insulation.

Common Defects: Echo, Reverberation, Noise, Sound leakage.

18. Lighting

Natural Lighting – Uses sunlight through windows, skylights and courtyards. Artificial Lighting – Uses electrical fixtures.

Good Lighting Requirements: Uniform illumination, No glare, Proper brightness, Energy efficiency.

Common Lamps: LED, Fluorescent, Halogen, Incandescent. LED lamps are most energy efficient.

19. Estimation and Specification

Estimate

Approximate cost of construction before execution. Purpose: Budget preparation, Tendering, Material planning, Cost control.

Types: Preliminary estimate, Detailed estimate, Revised estimate, Supplementary estimate.

Specification

Written description of materials, workmanship and quality. Types: General specification, Detailed specification.

20. Quantity Surveying

Quantity surveyor prepares: Quantity take-off, Cost estimate, Tender documents, Bills, Cost control.

Measurement units: Concrete – m³, Brickwork – m³, Plastering – m², Painting – m², Steel – kg, Excavation – m³.

21. Architectural Drawing

Types: Site plan, Layout plan, Floor plan, Elevation, Section, Working drawing, Structural drawing, Electrical drawing, Plumbing drawing.

Scale Examples: 1:20, 1:50, 1:100, 1:200, 1:500.

22. History of Architecture

Indus Valley Civilization

Features: Grid planning, Drainage system, Standard bricks, Public bath.

Buddhist Architecture

Stupa, Chaitya, Vihara.

Temple Architecture

Dravidian Style (South India) – Features: Gopuram, Mandapa, Vimana, Temple tank.

Nagara Style (North India) – Features: Curvilinear Shikhara, Garbhagriha, Mandapa.

Indo-Islamic Architecture

Features: Dome, Arch, Minaret, Calligraphy.

Colonial Architecture

Built during British rule. Features: Columns, Verandahs, Symmetry, Large windows.

Modern Architecture

Characteristics: Functional planning, Reinforced concrete, Glass facades, Steel structures, Minimal ornamentation.

Important Architecture Terms

• Foundation – Transfers load to soil.
• Plinth – Portion between ground and floor level.
• Lintel – Horizontal member above openings.
• Sill – Bottom part of window opening.
• Cornice – Decorative projection at roof level.
• Parapet – Low wall above roof.
• Cantilever – Projecting member fixed at one end.
• Beam – Horizontal load-carrying member.
• Column – Vertical load-carrying member.
• Slab – Flat horizontal structural member.
• Footing – Base supporting the foundation.
• FSI/FAR – Ratio of total built-up area to plot area.
• Setback – Minimum open space around a building.
• Carpet Area – Usable floor area excluding wall thickness.
• Built-up Area – Carpet area plus wall area.
• Super Built-up Area – Built-up area plus common spaces.

Frequently Asked TNPSC CTS Points

• English bond is the strongest brick bond.
• M20 is the minimum concrete grade generally used for RCC works.
• Ramp slope for accessibility is 1:12.
• Cross ventilation improves indoor comfort.
• Rainwater harvesting conserves groundwater.
• GRIHA is India's green building rating system.
• LEED is an international green building certification.
• NBC provides standards for building design and construction.
• Passive design reduces energy consumption.
• LED is the most energy-efficient lighting source.
• Shear walls improve earthquake resistance.
• Grid iron is the most common road pattern.
• Septic tanks treat sewage in areas without sewer networks.
• Earthing protects against electric shock.
• Dravidian temples are characterized by towering gopurams.

Quick Revision Table

Topic	Key Point
Foundation	Transfers building load to soil
Plinth	Protects building from ground moisture
DPC	Prevents rising damp
Beam	Horizontal structural member
Column	Vertical structural member
Slab	Horizontal floor/roof element
FSI/FAR	Built-up area ÷ Plot area
LEED	International green building rating
GRIHA	Indian green building rating
ECBC	Energy Conservation Building Code
HVAC	Heating, Ventilation & Air Conditioning
Ramp	Standard slope 1:12
English Bond	Strongest brick bond
M20	Common minimum RCC concrete grade
LED	Most energy-efficient lighting