Abstract
In this paper, bi-directional loading hybrid tests are carried out to examine the response behavior of square shaped steel bridge piers under the prescript ground accelerations in the Design Specification of the Road Bridge. Each of these ground motions has 2 horizontal components. Both unilateral and bilateral excitations are imposed to 2.4m high steel pier models with a 450mm × 450mm section. It is found from the experiments that the bilateral excitation deteriorates the lateral force of the piers compares to unilateral excitation.
