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The Alvord Lake Bridge was the first reinforced concrete bridge built in America. It was built in 1889 by Ernest L. Ransome, an innovator in reinforced concrete design, mixing equipment, and construction systems. The bridge was constructed as a single arch 64 feet (20 m) wide with a 20-foot (6.1 m) span. [1]
The bridge is constructed of reinforced concrete because studies after the 1906 San Francisco earthquake showed that reinforced concrete withstood earthquakes. [ 3 ] [ 4 ] The nearly one-quarter-mile (0.4 km) span cost US$245,967 (equivalent to $8,043,000 in 2023) to build, and consumed millions of board feet of local redwood timber for the ...
An unreinforced concrete arch is technically a masonry arch that use only very small stones, that is the aggregate of the concrete, sand and gravel. Such an arch would not stand without mortar. Some modern bridges are built masonry style with precast concrete blocks, like Gladesville Bridge that has a span of 305 metres (1000 ft). These types ...
The span replacement took place between 2002 and 2013, and is the most expensive public works project in California history, [5] with a final price tag of $6.5 billion, a 2,500% increase from the original estimate of $250 million, which was an initial estimate for a seismic retrofit of the span, not the full span replacement ultimately completed.
The bridge was built under budget for $199,861 (equivalent to $3.64 million in 2023 dollars [5]) and, at 360 feet (110 m), [1] was the longest concrete arch span in the California State Highway System. When it was completed, it was the highest single-span arch bridge in the world, [6]: 45 and it remains one of the tallest. [7]
Span range: Short to medium: Material: steel, reinforced concrete, prestressed concrete: Movable: Movable bridges of this type are very rare. Only one swing bridge of this type was known (demolished Nov. 11-19th 2009) Design effort: High: Falsework required: Depends upon length, materials, and degree of prefabrication
The roadway for the approach structures was supported during construction by an underlane self-launched movable scaffolding system (MSS), [21] and is the first project in California to use a MSS. [22] The MSS was designed to bridge the 235 ft (72 m) span between piers and to support the concrete as it was poured for each span. Once the concrete ...
Single span rigid-frame bridges are typically made of reinforced concrete and are commonly used on parkways and other roadways. [4] This design is an efficient use of material as the cross section at mid-span is relatively narrow and the amount of concrete needed at the abutments is reduced. [4]