Department for ENGINEERING STRUCTURES

Professor Vlado MICOV, Ph.D Head of Department

Bridge EngineeringWhat can we offer?

IZIIS Experience in the Field ofBridge Engineering

Evaluation of seismic parameters (local and regional) for design of bridges

Seismic evaluation and retrofit of existing bridges

Diagnosis, repair and strengthening of existing bridges

Experimental in situ investigations of existing bridges

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)

…Contd.

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 Ambient vibration testso Forced vibration testso Quasi-static testso Shaking-table tests

Equipment for ambient vibration measurementsEquipment for ambient vibration measurements

Seismometers

Signal conditioner

Fourier analyzer

Plotter

o Ambient vibration testso Forced vibration testso Quasi-static testso Shaking-table tests

• Shakers

• Control units

• Accelerometers

• Amplifiers

• Fourier analyzer

Equipment for forced vibration measurementsEquipment for forced vibration measurements

o Ambient vibration testso Forced vibration testso Quasi-static testso Shaking-table tests

Ambient and Forced vibration measurementson bridges - Case studies

Ambient and Forced vibration measurementson 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

Disposition of a model ready for quasi-static test in IZIIS’ laboratory

Disposition of a model ready for quasi-static test in IZIIS’ laboratory

o Ambient vibration testso Forced vibration testso Quasi-static testso Shaking-table tests

Shaking table test on a modelShaking table test on a model

Selected prototype structure for design of test models

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

o Ambient vibration testso Forced vibration testso Quasi-static testso Shaking-table tests

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

Seismic isolation of bridge structuresSeismic isolation of bridge structures

Experimental tests on neoprene bearingsExperimental 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

Selection of a bridge structure and vibration control elements

Bridge over Vardar river along the Skopje – Gevgelija motorway

…Seismically Isolated Bridge Structures…

…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

Repair of Bridge Structures: Analytical Modeling and Static & Eigen Analyses

Bridge “Goce Delchev” in SkopjeBridge “Goce Delchev” in Skopje

Seismic Evaluation of Bridge Structures: Analytical Modeling and Dynamic Analyses

Seismic Evaluation of Bridge Structures: Analytical Modeling and Dynamic Analyses

…Animation of the Structural Response due to Earthquake Excitations

…Animation of the Structural Response due to Earthquake Excitations

Simulation of the structural behavior under

real seismic input

Simulation of the structural behavior under

real seismic input

Problems regarding the bridge populations in Republic of Macedonia

Problems regarding the bridge populations in Republic of Macedonia

Problems related to existing structures

Problems related to design of new structures

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.

…Problems related to design of new bridge structures

…Problems related to design of new bridge structures

…Design of new pedestrian bridge “Oko” in Skopje

…Design of new pedestrian bridge “Oko” in Skopje

Numerical model

…Construction of the pedestrian bridge “Oko” in Skopje (with “Constructor” – Split)

…Construction of the pedestrian bridge “Oko” in Skopje (with “Constructor” – Split)

Construction of the foundation piles – drilling phase

Construction of the right-side abutment

Reinforcement of the foundation piles

Thank You For Your Attention