Department for ENGINEERING STRUCTURES
Professor Vlado MICOV, Ph.D
Head of Department
Bridge Engineering
What can we offer?
IZIIS Experience in the Field of
Bridge Engineering

Evaluation of seismic parameters (local and
regional) for design of bridges
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Seismic evaluation and retrofit of existing
bridges
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Diagnosis, repair and strengthening of
existing bridges
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Experimental in situ investigations of existing
bridges
…Contd.
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Dynamic analyses of bridges during design
phase
Application of seismic isolation of bridge
structures
Creation of information systems for bridge
populations in Macedonia needed for the
purpose of developing an integral Bridge
Management System (BMS)
Application of Methodology for Diagnosis of
RC Bridge Structures:
“Goce Delcev” Bridge in Skopje
Destructive test for
measurement of forces in
the cables of the middle rib
Taken concrete
samples
Experimental Study
o
o
o
o
Ambient vibration tests
Forced vibration tests
Quasi-static tests
Shaking-table tests
o
o
o
o
Ambient vibration tests
Forced vibration tests
Quasi-static tests
Shaking-table tests
Equipment for ambient vibration measurements
 Seismometers
 Signal conditioner
 Fourier analyzer
 Plotter
o
o
o
o
Ambient vibration tests
Forced vibration tests
Quasi-static tests
Shaking-table tests
Equipment for forced vibration measurements
• Shakers
• Control units
• Accelerometers
• Amplifiers
• Fourier analyzer
Ambient and Forced vibration measurements
on bridges - Case studies
RC bridge near“Holliday In”
hotel, Skopje
Mode shapes of transversal, vertical
and longitudinal vibrations
Pre-stressed RC overpass,
Skopje
Mode shapes of transversal, vertical
and longitudinal vibrations
o
o
o
o
Ambient vibration tests
Forced vibration tests
Quasi-static tests
Shaking-table tests
Disposition of a model ready for quasi-static
test in IZIIS’ laboratory
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o
Shaking table test on a model
Selected prototype structure for design of
test models
o
o
Ambient vibration tests
Forced vibration tests
Quasi-static tests
Shaking-table tests
Designed model of a bridge with incorporated
neoprene bearings and rubber stoppers
1. Model M1 - Neoprene bearings, actual vertical loads and rubber stoppers
2. Model M2 - Neoprene bearings, actual vertical loads, without rubber stoppers
3. Model M3 - Neoprene bearings, vertical loads lower than the prescribed ones
Seismic isolation of bridge structures
1. Experimental tests on rubber stopper elements for control of
dynamic behavior
2. Experimental tests on neoprene bearings under seismic loads
3. Seismic shaking table tests on bridge models with
incorporated seismic isolation elements
4. Theoretical research and formulation of nonlinear models of
individual seismic isolation models
Experimental tests on neoprene bearings
View of a neoprene bearing
Schematic presentation of deformations
Disposition of equipment used for
quasi-static tests
Application of cyclic displacement during a
test
Selection of a bridge structure and vibration
control elements
Bridge over Vardar river along
the Skopje – Gevgelija motorway
…Seismically Isolated Bridge
Structures…
o
Application of elements for isolation and absorption of
seismic energy in bridge structures is economically justified.
o
Design of isolation and seismic energy absorption elements
can be successful and verified based on direct dynamic
analyses performed for each concrete case
o
By use of typified elements for isolation and control of
vibrations, practical design is simplified and based on
selection of optimal elements for each concrete case.
Repair of Bridge Structures:
Analytical Modeling and Static & Eigen Analyses
Bridge “Goce Delchev” in Skopje
Seismic Evaluation of Bridge Structures:
Analytical Modeling and Dynamic Analyses
…Animation of the Structural Response due to
Earthquake Excitations
Simulation of the
structural behavior under
real seismic input
Problems regarding the bridge populations in
Republic of Macedonia
 Problems related to existing structures
 Problems related to design of new structures
…Problems related to design of new
bridge structures
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The institute can be involved in the phase of design of
new bridge structures as performer of design,
particularly contributing to harmonization of the
technical documentation with the new standards (Euro
codes).
The Institute can also be involved in the phase of
design as a reviewer, in which way it will cooperate
with other design engineers contributing to their
involvement in application of the Euro codes.
…Design of new pedestrian bridge “Oko”
in Skopje
Numerical model
…Construction of the pedestrian bridge
“Oko” in Skopje (with “Constructor” – Split)
Construction of the foundation
piles – drilling phase
Reinforcement of the
foundation piles
Construction of the
right-side abutment
Thank You For Your Attention