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Bridge and Structure Design

MI Engineering personnel have over 65 years of experience designing bridges in North Carolina, South Carolina, Virginia, and West Virginia. From the simplest cored slab span to the most complex curved steel girders, every project is held to the same high standards for quality design and on time delivery. Example projects highlighting recent staff experience are shown below.

R-2552AA - US 70 Goldsboro Bypass (Wayne County, NC)

While at Ko & Associates, PC in 2006 MI Engineering staff designed a bridge for the US 70 Goldsboro Bypass for the North Carolina Department of Transportation. The bridge carries Ramp DB to US 70 crossing over the US 117 Bypass between existing US117 and Salem Church Road. It is a two-span curved steel girder structure (335 ft total length) featuring a post-tensioned concrete integral interior bent.

The Goldsboro Bypass is part of a larger effort by NCDOT to bypass US 70 around several towns between Raleigh and the coast. The Goldsboro Bypass segment of the project (R-2554) has a total length of 20.6 miles and an estimated cost of $299 million. Construction is currently underway.

R-2552AA - US 70 Clayton Bypass (Wake and Johnston Counties, NC)

While at Ko & Associates, PC in 2004 MI Engineering staff designed two bridges for the US 70 Clayton Bypass project on an accelerated schedule for the North Carolina Department of Transportation. The bridge design was completed in less than 6 months and construction began 6 months later.

Bridge number 1087 is a four-span continuous curved steel girder bridge with a total length of 233.0 m (764.4 ft) and a clear roadway width of 9.0 m (29.5 ft). Bridge number 1088 is a five-span continuous curved steel girder bridge with a total length of 282.0 m (925.2 ft) and a clear roadway width of 12.0 m (39.3 ft). Both bridges have radial end bents on piles. Interior bents are radial hammerhead bents, except bent 1 at both bridges are double hammerheads skewed at 50 degrees from radial.

R-1030 D - US 117 Bypass (Wilson County, NC)

While at Ko & Associates, PC in 2001 MI Engineering staff designed 4 bridges for the NCDOT as part of the US 117 Bypass around Wilson, NC. Construction on the bypass began in September 2003 and was completed in September 2006.

A pair of dual bridges carries US 117 over the CSX Railroad. The superstructures consist of concrete deck on Type IV AASHTO girders made continuous for live load. The substructure consists of concrete end bents and post and beam interior bents supported by steel H-piles. A third structure carries an interchange ramp over the same section of railroad. Superstructure and substructure are similar to the dual bridges, but an increased skew angle makes the spans slightly longer.

The fourth bridge carries an interchange ramp over both lanes of US-264. This two-span continuous curved steel plate girder has severe skews up to to 145 degrees.