Experimental Study on Reinforced Single-column under Eccentric Load

In recent years, accidents of overall lateral overturning of simply-supported and continuous girder bridges have occurred in the world. Since 2018, Shanghai has carried out overturning design verification and risk identification for such girder bridges. Based on the calculation results and the actual bridge inspection results, the paper proposes a reinforcement method for the bridges with single-column. An additional steel bent beam is connected to the column, and additional auxiliary bearings on the lateral sides of the original bearings are arranged. By this method the steel bent beam is connected to the original columns through studs, which can reduce the construction time and guarantee the behaviour between the single-column and the bent beam. A full-size test specimen was designed and tested to investigate the behaviour and capacity of the reinforced method.

Through the test results, load-displacement curved was obtained and cracks were observed and recorded. The joint between UHPC and the column cracked and was the unfavourable design section for the method.

This method can guarantee the force state of bridges under service time, and the anti-overturning capacity is increased by the additional steel bent beam and bearings under extreme loading conditions.