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Effectiveness of classical rolling pendulum bearings
Raftoyiannis, Ioannis G.,Michaltsos, George T. 테크노프레스 2016 Multiscale and multiphysics mechanics Vol.1 No.2
During the last decades, Pendulum Bearings with one or more concave sliding surfaces have been dominating bridge structures. For bridges with relative small lengths, the use of classical pendulum bearings could be a simple and cheaper solution. This work attempts to investigate the effectiveness of such a system, and especially its behavior for the case of a seismic excitation. The results obtained have shown that the classical pendulum bearings are very effective, mainly for bridges with short or intermediate length.
Deflection of Castellated I-Beams under Transverse Loading
Ioannis G. Raftoyiannis,George I. Ioannidis 한국강구조학회 2006 International Journal of Steel Structures Vol.6 No.3
The fatigue behaviour of thin-walled CHS-to-SHS T-joints (t < 4 m) under in-plane bending are studied in this paper. Thefailure modes observed in the fatigue tests are described. Surface crack growth was recorded at progressive stages of fatiguelife, from initiation, through-thickness life and end of test failure. The characteristics of fatigue crack initiation and propagationare described. The stress concentration factors (SCFs) along the weld toes at both the circular brace and the square chord are-dimensional joint parameters on SCFs are discussed. The resultant SCFs are compared to both the SCFs from CHS and RHSparametric formulae in IIW guidelines. Both the fatigue tests and FE analyses showed that the hot spot locations of the CHS-to-SHS T-joints were located at the weld toe of the square hollow section chord.
Dynamic behavior of footbridges strengthened by external cable systems
Ioannis G. Raftoyiannis,George T. Michaltsos 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.66 No.5
This paper deals with the lateral - torsional motion of bridges provided with external cables acting as dampers under the action of horizontal dynamic loads or of walking human crowd loads. A three dimensional analysis is performed for the solution of the bridge models. The theoretical formulation is based on a continuum approach, which has been widely used in the literature to analyze bridges. The resulting equations of the uncoupled motion are solved using the Laplace Transformation, while the case of the coupled motion is solved through the use of the potential energy. Finally, characteristic examples are presented and useful results are obtained.
Effectiveness of classical rolling pendulum bearings
Raftoyiannis, Ioannis G.,Michaltsos, George T. Techno-Press 2017 Coupled systems mechanics Vol.6 No.2
During the last decades, Pendulum Bearings with one or more concave sliding surfaces have been dominating bridge structures. For bridges with relative small lengths, the use of classical pendulum bearings could be a simple and cheaper solution. This work attempts to investigate the effectiveness of such a system, and especially its behavior for the case of a seismic excitation. The results obtained have shown that the classical pendulum bearings are very effective, mainly for bridges with short or intermediate length.
Dynamic behavior of footbridges strengthened by external cable systems
Raftoyiannis, Ioannis G.,Michaltsos, George T. Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.66 No.5
This paper deals with the lateral - torsional motion of bridges provided with external cables acting as dampers under the action of horizontal dynamic loads or of walking human crowd loads. A three dimensional analysis is performed for the solution of the bridge models. The theoretical formulation is based on a continuum approach, which has been widely used in the literature to analyze bridges. The resulting equations of the uncoupled motion are solved using the Laplace Transformation, while the case of the coupled motion is solved through the use of the potential energy. Finally, characteristic examples are presented and useful results are obtained.
Michaltsos, George T.,Raftoyiannis, Ioannis G. Techno-Press 2009 Interaction and multiscale mechanics Vol.2 No.4
This paper presents a simple model for studying the dynamic response of multi-span bridges resting on piers with different heights and subjected to earthquake forces acting transversely to the bridge, but varying spatially along its length. The analysis is carried out using the modal superposition technique, while the solution of the resulting integral-differential equations is obtained via the Laplace transformation. It has been found that the piers' height and the quality of the foundation soil can affect significantly the dynamic behavior of such bridges. Typical examples showing the effectiveness of the method are presented with useful results listed.