About the author  ⁄ Roumen V. Mladjov, S.E.

Roumen V. Mladjov, P.E., S.E., has more than 52 years in structural and bridge engineering, and in construction management. He lives in San Francisco and his main interests are structural performance, efficiency and economy. He can be reached at rmladjov@gmail.com.

To the engineers and builders of the amazing, elegant, and powerful structures commonly known as Great Bridges.

Remarkable, Signature or Great Bridges?

Mankind has been building bridges since the time of early civilizations. Today, bridges are all around us – they provide easier, faster, and safer connections between two points. Bridges have evolved from merely utilitarian structures to become symbols of cities, countries, and human progress.

Read More →

The Role of Engineers, Architects, and Builders

Bridges are among the oldest structures used by mankind. From meeting purely utilitarian necessities, bridges have evolved with time to become symbols of human progress, of cities and entire countries. Among the thousands of bridges around us are the bridges that we all admire, the bridges that are the symbols of the eternal human aspiration for building longer and taller, stronger and faster.

Read More →

Part 2: A Study for Structural Efficiency and Economy in Construction

This article references several detailed Tables. Unfortunately, space constraints dictate not reprinting Table 1 from the May 2016 issue of STRUCTURE.

Efficiency and economy of structures are important parts of structural engineering. Efficiency and economy are not new ideas: engineers build many remarkable bridges and buildings under strict financial constraints.

Read More →

The U.S. Department of Transportation has determined that the country has too many existing bridges that need replacing or upgrading, rehabilitating or retrofitting. At the end of 2014, according to the National Bridge Inventory, more than 145,800 highway bridges are listed as structurally deficient or functionally obsolete; this is about 27% of all bridges based on total bridge deck areas. In some states, the situation is even worse; for example, in California the deficient bridges are 34.6%, and in New York State they are 59.8%!

Read More →

“This marks the physical beginning of the greatest bridge yet erected by the human race.”
President Herbert Hoover at the groundbreaking ceremony, 1933

The San Francisco-Oakland Bay Bridge is one of the greatest American bridges. Built during the Great Depression, the bridge soon became known as the “working horse of Northern California,” carrying the heaviest traffic in the region.

Read More →

Structural Forum is intended to stimulate thoughtful dialogue and debate among structural engineers and other participants in the design and construction process. Any opinions expressed in Structural Forum are those of the author(s) and do not necessarily reflect the views of NCSEA, CASE, SEI, C3Ink, or the STRUCTURE® magazine Editorial Board.

The Bay Bridge is one of the grandest engineering achievements in American history, as described in the Feature article this month. However, the recent renovation has not added a single lane to relieve traffic congestion, which has a negative impact on the Bay Area and California economies. There is one obvious solution for the problem – to build a second crossing between San Francisco and Oakland on an alignment approximately parallel to the original bridge.

Read More →