75461 - Structural Strengthening and Rehabilitation M

Learning outcomes

At the end of the class, student has knowledge of of available techniques and their application for strengthening or upgrading existing structural systems, with special emphasis on historical structures. In particular, at the end of the course he/she is able to assess materials and structural deficiency using field test or analytical methods, as well as to identify the suitable materials and techniques to strengthening and upgrading of gravity load-designed buildings for earthquake load resistance.

Course contents

1. HISTORIC MASONRY STRUCTURES, QUALITY AND TESTING

Quality of masonry, testing methods at component and assembly level for strength estimate. Capacity models, from laboratory tests to masonry wall strength.

Case study n. 1 – Testing on a old storehouse in Trieste.

2. DAMAGE STATES IN MASONRY BUILDINGS AFTER EARTHQUAKES AND SAFETY ASSESSMENT METHODS OF HISTORIC BUILDINGS

Behaviour of historic masonry buildings during earthquakes. Definition of the possible state of damage and identification of the causes. How to acquire knowledge of the building state and its structural performances.

Level of analysis for seismic safety assessment: simplified methods for assessing global performances of the building (Resisto method and LV1 method), local collapse mechanisms, full non linear analysis.

Examples of application of the different level of analysis.

Case study n. 2: Damage scenarios after Aquila (2009), Emilia (2012) and Centro Italia (2016) earthquakes.

Case study n. 3: Vulnerability assessment of historic monumental buildings: Pandone Castle in Molise

3. CRITERIA AND TECHNOLOGIES FOR REHABILITATION OF HISTORIC MASONRY BUILDINGS

Main goals to be achieved in masonry building strengthening. The box behaviours of a masonry building. Use of steel ties.

Masonry walls - Rehabilitation techniques for historic masonry structures. Traditional technologies for repairing masonry cracks (injections, reinforced injections, hoops, etc.) – Techniques for large stone buildings and walls

Curved masonry elements (vaults, arches, etc) - Traditional and innovative consolidation techniques for masonry vaults and domes.

Use of innovative materials - Use of composite materials (FRP, FRCM) for strengthening of masonry walls and curved structures: properties of composite materials, strengthening criteria and rules for intervention design.

Wood structures in historic buildings – classical timber structures for roofs and floors. Criteria for rehabilitation of timber structures. Advanced use of timber structures: use of wooden floor diaphragms for seismic strengthening of masonry buildings

Foundation structures – Foundation typologies in historic masonry buildings - Consolidation techniques of foundations (rehabilitation with micro piles, soil consolidation, use of consolidating injections).

Case study n. 4: Design of rehabilitation interventions on historic buildings: masonry buildings in Parma, Corinaldo (AN)

- HOMEWORK

Seismic vulnerability assessment of a simple masonry building; definition of the rehabilitation strategies and of most important interventions.

Readings/Bibliography

Usefull readings:

• CNR-DT 200 R1/2013 Istruzioni per la Progettazione, l’Esecuzione ed il Controllo di Interventi di Consolidamento Statico mediante l’utilizzo di Compositi Fibrorinforzati (in Italian)
• RELUIS-Schede illustrative dei principali meccanismi di collasso locali negli edifici esistenti in muratura e dei relativi modelli cinematici di analisi (in Italian)

Teaching methods

Lectures, homework, students' presentation

Assessment methods

The final evaluation will be formulated considering the evaluation of the homework, the presentation given by each student and the evaluation of an oral exam about the theoretical aspects covered during the course.

Students will be asked to prepare a 15 minutes presentation on a topic selected from a list which will be provided at the beginning of the course. They will give the presentation at the end of the course, before the oral exam.

Teaching tools

Blackboard, power-point presentations uploaded on Virtuale web-site

Office hours

See the website of Michele Palermo

See the website of Francesca Ferretti