aluminum bridges

The first aluminum bridge

Первый алюминиевый настил моста был установлен в городе Pittsburgh (США) в 1933 году.

However, the first all-aluminum bridge was built near Massena city in the US state of New York 1946 году. This railroad bridge was originally built as a twin-track steel bridge. V 1946 year long span 30,5 m was replaced by a riveted plate-girder structure of the aluminum alloy 2014. It should be noted, that the railway was not a trunk, and served as a local plant for the smelting of aluminum.

Total North America between 1946 and 1963 year was built 9 bridges, 8 of which still stand.

alyuminievyy-most-arvideFigure 1 – Алюминиевый мост Arvida (Квебек, Канада), built in 1950 году

Aluminum bridges in Europe

In Europe, the first aluminum bridge dates from 1949 годом (Sutherland, Великобритания). Yet 35 Bridges have been built between 1949 and 1986 year, most of them - between 1950 and 1970 years.

In the Netherlands, the first aluminum bridge was built in Amsterdam in 1955 year and another one near Anna Paulowna in 1961 году. Moreover, two bridges old flooring was replaced with aluminum, one in Amsterdam 1958 year and one in Rotterdam 1985 году.

1995 - the year of the revival of aluminum bridges

History shows aluminum bridges, that worldwide only a few aluminum bridges were built between 1970 and 1995 years. However, beginning with 1995 in the United States, as well as in Europe and Japan, New initiatives have been taken to develop and promote the construction of aluminum bridges. In Europe, in particular, in Norway and Sweden, It was found near 80 aluminum bridge decks, which replaced the old wooden or concrete floorings.

Advantages of aluminum bridges

causes, which caused increased interest in aluminum bridges, They are as follows.

1) Коммерческая выгода применения более легких конструкций, to:

  • increase the variable load on the bridge, it is important to update the existing bridges, for example, such, как мост вблизи города Lyon (Франция) (рисунок 2);
  • снижение стоимости механизированных (например, подъемных) мостов и мостов с длинными пролетами, у которых вес конструкции является основной нагрузкой;
  • расширение существующих мостов путем добавления легких конструкций;
  • упрощение сборки и строительства;
  • lower transport costs.

2) Выгода с точки зрения принципа устойчивого развития:

  • минимизация потребления материалов;
  • reducing costs and environmental impact of maintenance operations.

3) Возможность поставки прессованных алюминиевых профилей с большим разнообразием поперечных сечений, usually up to 600 mm and a width of 400 mm.

4) Значительный рост понимания алюминия как конструкционного материала, which occurred over the past decade.

5) Конкурентная стоимость алюминиевых конструкций. With proper design of the initial cost of aluminum constructions can compete with steel, whereas the complete lifecycle analysis usually shows benefit of using aluminum structures due to lower maintenance costs and longer life.

alyuminievyy-most-lyonFigure 2 – Алюминиевый мост вблизи города Lyon (Франция)

Eurocodes for aluminum bridges

In Europe, the design of aluminum bridges based on the following regulations – Eurocodes:

  • Расчетные нагрузки для алюминиевых мостов:
    EN 1991-1-3 (Еврокод 1): Воздействия на конструкции, part 1-3: Конструкции, prone to fatigue stresses.
  • Расчет статической прочности алюминиевых мостов:
    EN 1999-1-1, (Еврокод 9), part 1-1: Общие правила проектирования.
  • Расчет усталостной прочности алюминиевых мостов:
    EN 1999-1-3 (Еврокод 9), part 1-3: Конструкции, prone to fatigue stresses.

aluminum alloys, which are currently used for bridges, 5xxx series alloys are, for example, 5083, and 6xxx, for example, 6061 and 6082. These alloys have sufficient strength, as a static, and fatigue, good weldability and good corrosion resistance.

Important features of aluminum bridges

1) Низкий модуль упругости алюминия:

  • increased deflections,
  • increase the risk of vibration and
  • tendency to buckling.

2) Склонность к усталостным разрушениям:

  • переменные нагрузки имеют высокие значения по сравнению с постоянными нагрузками;
  • the fatigue strength of aluminum is approximately two times lower, than steel.

3) Риск гальванической коррозии при прямом контакте между алюминием и сталью.

A source:

  1. Aluminium Bridges – Past, Present and Future /T. Siwowski – Structural Engineering International 4/2006