In this paper, the study is conducted around a three span prestressed concrete (PRC) continuous
rigid frame bridge with a main span of 190 m and consisting of two parallelly-arranged roadway boxgirders.
By wind tunnel tests of an aeroelastic model, the aerodynamic coefficients of the front and rear girders are
discussed and the effect of horizontal angle of airflowβon these coefficients is also studied. Then, a
measurement usingthe thin plate to connecthorizontallythe two parallelly-arranged boxgirders is taken, and
its vibration suppressing effect on the wind induced response is analytically discussed. It is shown that for
long span rigid frame bridges with two parallelly-arranged roadway box girders, connecting horizontally the
two girders in cantilever construction stage can reduce the wind induced horizontal vibration response
effectively and easily.