Seminar and lunch on earthquake engineering and historic masonry

# 1 – Selection, scaling and simulation of input ground motion for time
history analysis of structures
# 2 – Earthquake loss estimation and risk assessment methodology:
From concept to real applications

Yasin Fahjan

Department of Earthquake and Structural Engineering, Gebze Institute of Technology, Kocaeli, Turkey

Dr. Yasin Fahjan graduated from civil engineering department of Eastern Mediterranean University in
1992 and completed his Ph.D. from Bogazici (Bosporus) University, Istanbul in 1999. He worked in
earthquake engineering department of Kandilli Observatory and Earthquake Engineering Institute from
1999-2006, then moved to Gebze Institute of Technology to re-establish the department of earthquake and structural engineering. His major fields of research are: earthquake engineering, strong ground motions analyses and processing, earthquake risk assessment, rapid response and early warning systems, computational methods, and seismic analysis for historical structures.


# 3 – Advanced retrofitting and monitoring of historical buildings

Senthivel Ramakrishnan

Research, Development and Innovation Department (I+D+i), ACCIONA Infraestructuras, Spain Dr. Senthivel Ramakrishnan is working as a Research project Scientist in the Research and Development Department at the Acciona Infrastructures in Madrid, Spain. He has bachelor, master and doctoral degrees in Civil/ Structural Engineering from India. He has carried out researches in India, USA, Germany, South Africa and Portugal in the are of structural engineering particularly FEM Modelling, Static, Dynamics, Seismic, Cyclic and Fatigue Tests on Masonry and Concrete Structures/ Materials, Fibre Reinforced Polymer (FRP) Retrofitting Techniques, Masonry in-Filled RC Framed Structures and Model/ Prototype Experimental and Analytical Studies. He has about 16 years of professional work experience and he is author of over 20 research publications in structural masonry and concrete. His present research includes retrofitting and monitoring of historical buildings.

Date: July 12, 2010 (11:00h)

Duration: 2:00 hours

Location: Meeting room, Civil Engineering Department, Guimarães

Enrolment
Enrolment is free of charge but required until July 8. For further
information please contact Ms. Paula Teixeira: phone (253 510218)
or email (sec.estruturas@civil.uminho.pt)
Maximum nº participants 30
Lunch Free Pizza lunch follows the presentation. You must confirm your attendance to the lunch on enrolment

# 1 – Selection, scaling and simulation of input ground motion for time history analysis of structures
The rapid developments in computational facilities allow the time-history analyses to become more common in seismic analysis and design of structures. The selection of convenient time history records is the most crucial issue of the transient seismic analysis of structures. Seismic design codes generally define ground shaking in the form of a response spectrum of acceleration and allow using design spectrum compatible time history records which can be obtained by scaling real earthquake records or by generating artificially or synthetically. Due to the increase of available strong ground motion records, the real recorded accelerograms become one of most valuable source in this field. Artificial accelerograms are generated to match the target design response spectrum by obtaining a power spectral density function from the smoothed response spectrum, and then to derive sinusoidal signals having random phase angles and amplitudes. Synthetic accelerograms are generated from seismological source models and accounting for path and site effects.
In this seminar, existing methodologies and criteria for selection, scaling and simulation of strong ground motion time histories will be reviewed with a discussion on availability, simplicity and suitability for nonlinear structural analysis.

# 2 – Earthquake loss estimation and risk assessment methodology:
From concept to real applications The rapid developments in computational facilities allow the time-history analyses to become more common in seismic analysis and design of structures. The selection of convenient time history records is the most crucial issue of the transient seismic analysis of structures. Seismic design codes generally define ground shaking in the form of a response spectrum of acceleration and allow using design spectrum compatible time history records which can be obtained by scaling real earthquake records or by generating artificially or synthetically. Due to the increase of available strong ground motion records, the real recorded accelerograms become one of most valuable source in this field. Artificial accelerograms are generated to match the target design response spectrum by obtaining a power spectral density function from the smoothed response spectrum, and then to derive sinusoidal signals having random phase angles and amplitudes. Synthetic accelerograms are generated from seismological source models and accounting for path and site effects.
In this seminar, existing methodologies and criteria for selection, scaling and simulation of strong ground motion time histories will be reviewed with a discussion on availability, simplicity and suitability for nonlinear structural analysis.

# 3 – Advanced retrofitting and monitoring of historical buildings
Senthivel Ramakrishnan
Number of historical cultural heritage buildings that needs strengthening is growing worldwide. The L'Aquila earthquake in Italy caused significant damage to cultural heritage buildings. Most of the historical buildings are non-standard and do not meet the current level of structural safety. Damage to historical buildings has shown the vulnerability of masonry wall to in-plane and out-of-plane failures caused by earthquake, wind, blast, or flood load combinations consisting of lateral, transverse as well as axial loads. Hence, retrofitting of historical building is necessary and before the design and development of retrofitting scheme, a complete analysis including continues monitoring is necessary
for a cost effect and efficient retrofitting solution. This presentation is about in-situ shear-compression tests carried out on a historical stone masonry walls in a building from late 19th century. Axial precompression load was varied. The experimental tests were carried out on: i) fresh wall, ii) tested and retrofitted wall, iii) retrofitted fresh wall. Advanced external jacket retrofitting techniques using Fibre reinforced polymer (FRP) rebar was employed in the test programme. A fresh wall specimen was retrofitted with conventional steel reinforcement for comparison with FRP. The presentation includes
also structural health monitoring of this historical building using advance wireless technology.