Bruce Howard Gerhard, 31, a Washington attorney who specialized in government construction and supply contract disputes, was pronounced dead at Fairfax Hospital on Friday of injuries he sustained in an automobile accident on the Capital Beltway.

Virginia State Police said the accident occurred when the car Mr. Gerhard was driving struck a disabled truck that was parked on the side of the Beltway in Fairfax County.

Mr Gerhard was born in West Chester, Pa. He graduated from the University of Virginia in 1970 and earned his law degree from George Washington University in 1973.

He was a partner in the Washington law firm of Lewis, Mitchell & Moore until 1978, when he joined the Washington office of the firm of Gadsby & Hannah, which is headquartered in Boston.He especialized in trial work.

Survivors include his wife, Ellen Tchakirides Gerhard, of Oakton, where the family lives; a daughter, Kelsey Forges, and a son, Duncan William, also of Oakton; his father William H. Gerhard, of Chadds Ford, Pa.; his mother, Harriet D. Gerhard, of Southbury, Conn.; a brother, Lang H. Gerhard, of New York City, and a sister, Pamela G. Skeele, of Syracuse, N.Y.

The family suggests that expressions of sympathy be in the form of contributions to the Nantucket Conservation Foundation, Inc., P.O. Box 13, Nantucket, Mass., 02554.