Transverse collaborative working performance (TCWP) is of great importantce to assembled beam bridges’ safety and serviceability, which can be charaterzied by the ability of transvese connections (hinge joints) to transfer force. This paper proposes a multi-beam model connected by distributed springs for assembled beam bridges’ modal characteristic analysis. Both the strain and displacement modal shape (surface) of this multi-beam model can be expressed as a product of longitudinal base function and transverse proportional coefficient vector, which can be obtained explicitly by solving a matrix eigenvalue problem. The transverse proportional coefficient vectors in the solutions can be seen as transverse modal shapes in a cross-section. Then, two types of monitoring indexes (baseline-free and baseline-required) based on transverse modal shapes for hinge joint damage detection and TCWP monitoring are constructed. The applicability of indexes proposed is proved by numerical simulations in different damage cases and index analysis in consideration of modal noise or not.

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The hinge joints of the assembled concrete multi-girder bridge (ACMGB) are the main components of transverse transmission of loads and the decline of their transmission capacity would lead to the degradation of the transverse cooperative working performance (TCWP) of the multi-beam system. As the key working performance of this kind of bridges, its severe degradation would

The hinge joints of the assembled concrete multi-girder bridge (ACMGB) are the main components of transverse transmission of loads and the decline of their transmission capacity would lead to the degradation of the transverse cooperative working performance (TCWP) of the multi-beam system. As the key working performance of this kind of bridges, its severe degradation would result in the single-girder-bearing phenomenon inducing bridge collapse. In order to detect TCWP degradation timely, this paper proposes a vibration-based monitoring scheme of the ACMGB, where structural vibration information are collected by accelerometers and dynamic strain guages at the bottom of girders in mid-span. These monitoring data are then used for identifing transverse mode shape of the multi-beam system and its derivated index in order to evaluate TCWP. This scheme has been implemented on three adjacent ACMGBs in Tongji Road Viaduct in shanghai and the preliminary analysis of monitoring data proves the effectiveness and rationality of the monitoring scheme proposed in this paper, which has the potential of the TCWP evaluation.