Prefabrication

Code:

EC0046

Acronym:

PFAB

Keywords
Classification	Keyword
OFICIAL	Materials

Instance: 2011/2012 - 1S

Active?	Yes
Responsible unit:	Construction Materials Division
Course/CS Responsible:	Master in Civil Engineering

Cycles of Study/Courses

Acronym	No. of Students	Study Plan	Curricular Years	Credits UCN	Credits ECTS	Contact hours	Total Time
MIEC	15	Syllabus since 2006/2007	5	-	5	52,5	133

Teaching language

Portuguese

Objectives

Recently, prefabrication has received growing attention and nowadays it plays a central role in the industrialization of the construction with reinforced and prestressed concrete. This construction procedure involves several specificities, in comparison with the traditional procedures of construction “in-situ”.

This course unit aims to provide basic information on the different topics covered by the program of the course unit. The student shall be able to apply the information provided and the code provisions, to the resolution of practical problems presented in the practical classes. The student shall be able to analyse alternative solutions for the construction of prefabricated floors and for the connection between precast elements. The student shall be able to judge and evaluate the adopted strategies for the solution of the problems. Contact with the organization and procedures of real prefabrication companies will be provided by field trips to precast plants.

Program

Chapter 1 PREFABRICATION IN CONSTRUCTION
Industrialization of construction.
Advantages and inconveniences of prefabrication.
Quality, execution deadlines, costs, conception and security.
Prefabricated solutions in wood, metallic materials and concrete.

Chapter 2 PREFABRICATION IN CONCRETE
Light, half-light and heavy prefabrication.
Products produced in Portugal.
Plain concrete products.
Reinforced structural concrete products.
Complex of reinforced structural concrete products.
New materials in concrete prefabrication.

Chapter 3 QUALITY IN CONCRETE PREFABRICATED ELEMENTS
Quality in construction, design and execution.
Product quality.
New technologies and constructive procedures.
Quality control.

Chapter 4 CODES ON PREFABRICATION IN CONCRETE
European regulation.
Constructive procedures.
Conception and design of sections, elements and connections.

Chapter 5 PREFABRICATION OF FLOOR STRUCTURES
Slabs.
Systems for prefabrication of building floors.
Composite beam-block floors. Conception and design. Constructive procedures.
Composite slabs made of solid planks with in-situ concrete. Conception and design. Constructive procedures.
Hollow core slabs. Conception and design. Constructive procedures.
Double-T units with topping. Conception and design. Constructive procedures.

Chapter 6 CONNECTIONS BETWEEN PRECAST ELEMENTS IN CONCRETE BUILDINGS
Basic mechanisms for transference of shear and axial forces (compression and tension).
Pinned and fixed connections.
Beam-column connections. Column-column connection. Column-foundation connection.
European codes.
Elastomeric bearing pads. Elastomeric reinforced bearing pads. Conception and design.
Connection to the supports in between beam-block floor systems.
Tying systems and structural integrity in case of accident.

DEMONSTRATION OF THE SYLLABUS COHERENCE WITH THE CURRICULAR UNIT'S OBJECTIVES:

The syllabus focuses on the various issues indicated in the unit’s objectives. The acquisition of key competencies and skills is stimulated though theoretical presentations and discussions, and also by means of the confrontation with practical problems and contact with one or more prefabrication companies. The syllabus is organized in such a way so that generic knowledge is transmitted initially. The degree of detail is progressively increased, so that the various issues under analysis can be adequately managed and understood.

Mandatory literature

ULL; Planning and design handbook on precast building structures. ISBN: 174266115
Elliott, Kim S.; Precast concrete structures. ISBN: 0-7506-5084-2
Fédération Internationale de la Précontrainte (FIP), Fédération Internationale du Béton (fib); Composite Floor Structures. ISBN: 1-874266-38-7
Fédération Internationale de la Précontrainte; Precast prestressed hollow core floors. ISBN: 0-7277-13752
Rui de Sousa Camposinhos e Afonso Serra Neves; Lajes aligeiradas com vigotas pré-tensionadas. ISBN: 972-752-081-2

Teaching methods and learning activities

Lectures comprise oral presentations and discussion of case studies. Practical lessons include practical problems, calculation of applications and also field trips to precast plants.

DEMONSTRATION OF THE COHERENCE BETWEEN THE TEACHING METHODOLOGIES AND THE LEARNING OUTCOMES:

The combination of theoretical presentations, discussion of the course-unit contents, solving of practical problems and field trips allows for an efficient learning experience at this education level.

Evaluation Type

Distributed evaluation with final exam

Assessment Components

Description	Type	Time (hours)	Weight (%)	End date
Attendance (estimated)	Participação presencial	49,00
Problem nº 1	Teste	5,00
Problem nº 2	Teste	5,00
Problem nº 3	Teste	5,00
Problem nº 4	Teste	5,00
Final Exam	Exame	3,00
	Total:	-	0,00

Amount of time allocated to each course unit

Description	Type	Time (hours)	End date
Study	Estudo autónomo	31
	Total:	31,00

Eligibility for exams

To get access to the final exam, the student cannot exceed the maximum number of absences from class admitted by the NGA. In the present years, the maximum number of absences is three. This rule is not applied in the case of students covered by the exceptions included in the NGA.

Calculation formula of final grade

The final grade is taken as the weighted average of the Distributed Evaluation and the Final Exam, whose weights are 0.15 and 0.85 respectively. The final classification is rounded to the nearest integer.

The Distributed Evaluation consists of 4 practical problems which are presented in different practical classes over the semester. The Distributed Evaluation is rounded to the nearest tenth.

The Final Exam consists of written work which comprises two components (theoretical and practical). The practical component consists of an open-book exam. The classification of the Final Exam is rounded to the nearest tenth.

Examinations or Special Assignments

not applicable

Special assessment (TE, DA, ...)

The evaluation of students excused of frequency, under the cover of the paragraph 3º of the Artº 4º of the NGA, will be made by criterion adopted for ordinary pupils: Distributed Evaluation based on four practical problems presented in the practical classes and Final Exam.

Classification improvement

The final improvement of classification is gotten through a written test only (the final exam, which can be required by students who have already gotten positive grade in the course unit). There is no possibility to specifically improve the classification of the Distributed Evaluation. The final grade is taken as the best of the final exam for improvement of classification and the original positive grade.

Observations

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Estimated working time out of classes: 3 hours per week