Family house

PROJECT OF A FAMILY HOUSE IN HARARE, ZIMBABWE

A MODULAR HOUSING SYSTEM DESIGNED IN ITALY December 2011

AN OPERATION OF:

T&T COSTRUZIONI s.r.l.

Piazza S.Rocco 10, 42015 Correggio (RE) - Italy Ph. +390522642528 - Fax +390522693340 Email: info@ttcostruzioni.it

STRUCTURAL SYSTEM:

VALTER DECIA COSTRUZIONI MECCANICHE Via dell’Artigianato 44 16121 Finale Ligure (Sv) Ph. +39019680333 – Fax. +390196816370 Email: valterdecia@tiscali.it

Scientific consultant:

UNIVERSITÀ DEGLI STUDI DI GENOVA Dipartimento di scienze per l’architettura Massimo Corradi, Vicente Leina

DESIGN:

STUDEMA

Engineering Via Biglia 3 – 16128 Genova – Italy Ph. +390105537006 – Email info@studema.it Team Leader: Francesco P. De Martino.

Design Team: Francesco P. De Martino, Francesco Nannini, Laura Barabino.

goagroup viale Sauli 4 - 16121 Genova – Italy Ph. +390105702645 - Email info@goagroup.it Team Leader: Nicola Pisani Design Team: Nicola V. Canessa, Gabriele Pisani, Nicola Pisani, Paolo A. Raffetto

1) INTRODUCTION 2) ARCHITECTURAL PROJECT 3) STRUCTURAL SYSTEM

4) STRUCTURAL PROJECT

Site location: HARARE (ZIMBABWE)

HARARE

ZIMBABWE

ZIMBABWE

Document object: architectural and structural design of a two floors mono-familiar house located in Zimbabwe.

Total internal surface: 185 m2 (plus a car box, Area = 23 m2) FAMILY HOUSE IN HARARE, ZIMBABWE

1) INTRODUCTION 2) ARCHITECTURAL PROJECT 3) STRUCTURAL SYSTEM

4) STRUCTURAL PROJECT

Ground floor plan

FAMILY HOUSE IN HARARE, ZIMBABWE

First floor plan

FAMILY HOUSE IN HARARE, ZIMBABWE

Roofing plan

FAMILY HOUSE IN HARARE, ZIMBABWE

South view

East view

FAMILY HOUSE IN HARARE, ZIMBABWE

North view

Ovest view

FAMILY HOUSE IN HARARE, ZIMBABWE

Section A-A’ Vertical section

Plant section

FAMILY HOUSE IN HARARE, ZIMBABWE

3D sketch no.1

3D sketch no.2

FAMILY HOUSE IN HARARE, ZIMBABWE

3D sketch no.3

3D sketch no.4

FAMILY HOUSE IN HARARE, ZIMBABWE

Components modular composition

Basic structure

+ car box

+ panoramic external window FAMILY HOUSE IN HARARE, ZIMBABWE

+ external shed

+ internal closed volume instead of external lodges

Cladding alternatives (suggestions)

Brick cladding

Thermal coat External covering (with stone elements, wood panels , metallic elements)

FAMILY HOUSE IN HARARE, ZIMBABWE

Building external rendering

Example of an external rendering view – wooden finishing facade

FAMILY HOUSE IN HARARE, ZIMBABWE

Building external rendering

Example of an external rendering view – mortar finishing facade

FAMILY HOUSE IN HARARE, ZIMBABWE

Building external rendering

Example of an external rendering view – stone finishing facade

FAMILY HOUSE IN HARARE, ZIMBABWE

Building external rendering

Example of an external rendering view – brickwork finishing facade

FAMILY HOUSE IN HARARE, ZIMBABWE

Rendering (suggestions) Roof view

FAMILY HOUSE IN HARARE, ZIMBABWE

Rendering (suggestions) Internal view

FAMILY HOUSE IN HARARE, ZIMBABWE

Rendering (suggestions) Internal views

FAMILY HOUSE IN HARARE, ZIMBABWE

1) INTRODUCTION 2) ARCHITECTURAL PROJECT 3) STRUCTURAL SYSTEM

4) STRUCTURAL PROJECT

Structural system Innovative steel structure modular system The system is characterized by the union of special steel lattice beams and columns composed by at least two RHS profiles connected by standardized steel rods

Steel rods (S or N or M shape)

RHS profiles

Connections: made by controlled automatized weldings (Standard followed: DM2008 – Circ.Min. 2-2-2009 n°617 – UNI EN ISO 15614-1:2008 – UNI EN ISO 5817:2008 – UNI –EN ISO 3834:2006)

FAMILY HOUSE IN HARARE, ZIMBABWE

Element used for beams and columns

Element “type 1” 3D view

Dimensions

Used as beams

Element “type 2” 3D view Dimensions

Used as beams/columns

Element “type 3” 3D view Dimensions FAMILY HOUSE IN HARARE, ZIMBABWE

Used as beams

Element used for floor structure Element “Type1”

Paving

Structural Slab

Ceiling Ducts Thermal Insulation Acoustic Insulation

FAMILY HOUSE IN HARARE, ZIMBABWE

Technical Datas: • Structural panel thickness 37.5 mm • Single elements sizes 1000 mm x 500 mm • Element weight 22.5 kg

Main features 

Lightness: The maximum weight for each profile is about 0.085kN/m



Resistance: Each beam component is made with rolled steel of certified mechanical properties



Simplicity: Structure very quick to assemble (simple connections, rational modular construction system)



Duration: Elements made by galvanized steel structure protection against atmospheric agents



Economy: Precast modular system simplification of the structure installation (less global work costs)



Dry mounting: Structure assemblage by dry unions to build the building is not necessary waiting time

FAMILY HOUSE IN HARARE, ZIMBABWE

Experimental tests In 2010 an experimental construction (built with the same technology of the structure proposed for the Zimbabwe’s family house) has been dynamically tested for seismic action in Italy.

Structure module, scale 1:1 FAMILY HOUSE IN HARARE, ZIMBABWE

Displacement tranductors

Experimental tests The construction system could resist to earthquakes with p.g.a higher than 0.5 g.

Resonance tests: • Frequency range: 0.5 – 36 Hz • Sweep rate: 0.5 octave/min • Peak excitation level: 0.05g

Main tests: • Frequency range: 0.71– 37 Hz • Time history (th): 40 s • Strong part of th: > 20 s • Sampling rate: 400 Hz

Displacement diagrams

Standards followed: CEI 75-16, 1997-06, 75-16 “Classification and environmental conditions – Part 2: Environmental conditions appearing in nature – Earthquake vibration and shock”, DM2008 – Circ.Min. 2-2-2009 n°617 FAMILY HOUSE IN HARARE, ZIMBABWE

1) INTRODUCTION 2) ARCHITECTURAL PROJECT 3) STRUCTURAL SYSTEM

4) STRUCTURAL PROJECT

The admissible capacity of the ground has been preliminarily defined on the base of the soil geotechnical parameters (that depend on the type of ground present) and of the characteristics chosen for the foundation system.

The admissible capacity of the ground has been preliminarily defined on the base of the soil geotechnical parameters (that depend on the type of ground present) and of the characteristics chosen for the foundation system.

Operation principles Each floor structure: composed by the union of different orthogonal lattice beams

The saddle roof structure made by the union of lattice beams connected to the perimetral beams of the third level by a special joint (allow many little adjustments in the execution phase).

Material properties Concrete for foundations: C25/30 (Rck >= 30 N/mm2) Lean Concrete under foundations: C12/15 (Rck >= 15 N/mm2) Reinforcement steel: B 450 C fy/fyk < =1.35 (ft/fy) > = 1.13 Profiles steel: S 275 JR UNIEN 10025 fy > = 275 N/mm2

FAMILY HOUSE IN HARARE, ZIMBABWE

Soil properties Admissible capacity of the ground defined on the base of the soil geotechnical parameters – characteristics of the foundation system.

Load analysis • • • • •

Self weight (self weight of the profiles used) Dead loads (complementary-finishing works) Live loads (2 kN/m2, typical value for buildings like this) Wind action (acting on the building facade and on the coverage) Earthquake action (applied in the C.G of the masses)

Load combinations Load combination as required by the followed structural codes FAMILY HOUSE IN HARARE, ZIMBABWE

Numerical simulation Numerical model of the whole structure developed with finite element method software: Beams/columns â&#x2020;&#x2019; modeled by using mono-dimensional elements (2 nodes)

Foundation system Linear elements (foundation beams) jointed to form a grid structure (pre-dimensioned on the basis of the admissible capacity of the soil/maximum pressure on the ground)

FAMILY HOUSE IN HARARE, ZIMBABWE

Assembling phases

FAMILY HOUSE IN HARARE, ZIMBABWE

Structural design Ground floor plan Floor structure Beams “1” 1 elements “type 1”

Beams “2” 2 elements “type 2”

FAMILY HOUSE IN HARARE, ZIMBABWE

4 elements Columns “type 2”

Columns

4 elements “type 2”

First floor plan

Beams “3” 1 elements “type 3”

Stairs position Floor structure

Beams “1” 2 elements “type 1” Beams “2”

2 elements “type 2”

FAMILY HOUSE IN HARARE, ZIMBABWE

Structural design

Roof structure

Transversal section

Beams “1” Structural joints Stairs position

Columns

R.c.

Foundation footing

FAMILY HOUSE IN HARARE, ZIMBABWE

Roof structure

Structural design Longitudinal section

Structural joints

Beams “3”

Beams “2”

R.c. foundation footing

Column

FAMILY HOUSE IN HARARE, ZIMBABWE

Stairs position

STUDEMA Engineering

goagroup

Via Biglia 3 – 16128 Genova – Italy Ph. +390105537003 +390105537006 +393342839803 - Email: info@studema.it

Viale Sauli 4 - 16121 Genova – Italy Ph. +390105702645 Email: info@goagroup.it