Wyniki wyszukiwania - BazTech

1

Recent research on flexible culverts in sloping terrain

Wadi A., Pettersson L.

Archiwum Instytutu Inżynierii Lądowej

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2017

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Nr 23

293--299

EN

The performance of buried flexible steel structures is directly influenced by the quality of the backfill soil and its configuration around the conduit. The economical choice of these structures stimulates practitioners to expand their different applications including their performance in sloping environment. The presence of steep surface slopes induces unbalanced loading and asymmetrical soil support around the conduit. This paper outlines the latest research efforts on how a flexible culvert would perform in sloping terrain environment. The paper focuses primarily on the structural behaviour of soil loading effects. The investigation highlights the use of numerical simulation in predicting the performance of a case study of flexible culvert under different construction schemes, where the influence of slope intensity and depth of soil cover are briefly presented. Soil slope stability as a major concern is also discussed. The research outcome clearly underlines the importance of soil configuration around steel culverts. The asymmetrical response of the conduit is predictably observed from the results and greatly influenced by the presence of shallow depth of soil covers. Sectional forces tend to increase with the increase of surface slopes. The results also underline the necessity of soil stability investigation when constructing flexible culverts in sloping terrain.

2

Large-span soil steel composite bridges

Wadi A., Pettersson L.

Archiwum Instytutu Inżynierii Lądowej

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2017

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Nr 23

287--292

EN

Soil-steel composite bridges are considered competitive structures being an economical alternative to similar span concrete bridges. They are increasingly used for road and railway bridge construction. Spans have increased and structures with spans over 20 m have been built. The continuous development of infrastructure impels designers to push the limits of these structures for bigger spans with the lowest possible height of cover. Since the birth of the ring compression theory, different design methods have been developed to account for the various conditions and facilitate the use of bigger span structures. Yet, there is an urge to investigate whether the current design procedures are conservative or if they are reasonably accurate to predict the capacity of large-span structures. This paper presents the on-going project involving the capacity of large-span soil-steel composite bridges. The study investigates the use of finite element modelling in predicting the performance of a case study for an ultimate limit state field test. The project also highlights the need and intention to perform an ultimate limit state test for a large-span structure. The outcome of the project is to assess the current design procedures and to reflect recommendations on the design where seen applicable.

3

Fatigue design of soil steel composite Bridges

Pettersson L., Leander J., Hansing L.

Archiwum Instytutu Inżynierii Lądowej

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2012

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Nr 12

237-242

EN

Soil steel composite bridges are used more and more often in road and railroad bridge construction. Spans have increased and structures with spans over 20 m have been built. At the same time road designers call for lower heights of cover. At lower heights of cover the effect of concentrated loads will increase and therefore checking of the fatigue capacity is becoming more important. The paper presents the on-going project involving fatigue testing of bolted connections used to lap corrugated steel plates in Soil Steel Composite Bridges together with an evaluation of the detail category. The project also includes the development of a design procedure for the fatigue design of a Soil Steel Composite Bridge with low height of cover according to the Eurocode.

PL

Kompozytowe konstrukcje gruntowo-stalowe są wykorzystywane coraz częściej w roli mostów drogowych i kolejowych. Rozpiętość tych konstrukcji wzrasta; powstają nawet konstrukcje o rozpiętości przekraczającej 20 m. Jednocześnie projektanci dróg wymagają coraz mniejszej wysokości naziomu. Przy mniejszej wysokości naziomu wzrasta oddziaływanie skupionych obciążeń, co zwiększa znaczenie kontroli wytrzymałości zmęczeniowej. Praca przedstawia prowadzony aktualnie projekt badawczy, obejmujący próby zmęczeniowe połączeń śrubowych służących do łączenia na zakładkę blach w mostach gruntowo-stalowych ze stali falistej wraz z oceną kategorii. Projekt obejmuje również opracowanie procedury projektowania wytrzymałości zmęczeniowej mostów gruntowo- stalowych z niskim naziomem zgodnie z Eurocode.

4

Development of design tools for soil steel composite bridges

Pettersson L.

Archiwum Instytutu Inżynierii Lądowej

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2012

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Nr 12

21-41

EN

This paper describes some of the research background needed for the development of the Swedish design method for Soil Steel Composite Bridges. The research work was undertaken at the Department of Civil and Architectural Engineering, division of Structural Engineering and Bridges, at KTH Royal Institute of Technology in Stockholm, Sweden. With spans growing larger and heights of cover smaller, the aim was to develop a design method that could be used in everyday design work. The design method, based on several full-scale tests, is today a code requirement in Sweden and Finland and is in use in several other countries in Europe. This paper describes some of the background to the design method, but also on-going research and planned future developments.

PL

Praca opisuje częściowo podstawy badań przeprowadzonych w opracowania szwedzkiej metodologii projektowania mostów gruntowo-stalowych. Badania zostały przeprowadzone na Wydziale Inżynierii Lądowej i Wodnej i Architektury w katedrze Inżynierii Budowlanej i Techniki w Królewskim Instytucie Techniki KTH w Sztokholmie w Szwecji. Ponieważ zwiększają się rozpiętości, a wysokości naziomu maleją, celem pracy było opracowanie metody projektowej, którą można stosować w codziennej pracy projektowej. Metoda projektowa, oparta o kilka prób w pełnej skali, stanowi dzisiaj część wymogów przepisów projektowych w Szwecji oraz Finlandii i jest również stosowana w innych krajach europejskich. Praca opisuje część badań, które pozwoliły opracować tę metodę, a także badania prowadzone obecnie i planowane.