The paper presents results of the laboratory tests made for the prototype resilient under sleeper pads in the Warsaw University of Technology laboratory unit. These pads are dedicated to reduce vibrations transmitted to the vicinity of the railroad and to improve the resistance of the railroad structure. The laboratory testing program was carried out for elastomeric materials (polyurethane and rubber based) due to the PN-EN 16730 standard. The obtained values of the key parameters were used in order to determine the insertion loss vibration level by applying analytical method. The paper presents the influence of selected parameters i.e. static and dynamic moduli on the reduction of vibration and structure-borne sound level.
On the 14th of February, 2015, a huge fire broke out on Łazienkowski Bridge; a five span bridge, 423 m long and 28 m wide, built in the years 1972-74. It was a fully steel structure with four plate girders and orthotropic deck.The fire started under the first span during the replacement of wooden service decks. The next day, the Department of Bridges of the Warsaw University of Technology was designated to conduct an expertise material investigation, geometrical verification, and FEM model analysis. The subject of this paper concentrates on geometrical issues.The main difficulty of this task was the lack of full reference data regarding the bridge's original structure. The old design was incomplete and there was no actual surveying results for the undamaged structure. As a conclusion, some remarks focused on surveying measurements and on the final decision regarding this bridge are given. It was eventually exchanged into a brand new one and put into public use on the 28th of October, 2015.
<p>A huge fire on Lazienkowski Bridge across Vistula River - one of the most important bridges in the center of Warsaw – capitol of Poland occurred on 14 of February 2015. The bridge was built in 1972-74as full steel structure with three wooden service decks between girders. It consisted of five four girders continuous spans 76,5+90,0+90,0+90,0+76,5 m. The fire started during the exchanging of these wooden elements under the first span. It started in the afternoon and was extinguished next day in the morning. During that time three spans were under fire. Extensive investigation and analysis were done during next 6 weeks including material investigation, geometrical verification of steel superstructure and FEM model analysis to determine the behavior of bridge during thermal overloads. Following results are presented in the paper i.e. local deformation of the deck and webs of the girders, global rotation of the outer girders and global displacement of the all four girders (also due to bearing and expansion joints behavior).</p>
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