Monitoring Index of Transverse Collaborative Working Performance of Assembled Beam Bridges Based on Transverse Modal Shape

Abstract

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.

Vibration-Based Monitoring for Transverse Cooperative Working Performance of Assembled Concrete Multi-Girder Bridge: System Design, Implementation and Preliminary Application

“…In the previous work [23], it has been proved that, under certain assumptions, the modal vibration of ACMGBs can be analyzed by means of a multi-beam model connected by distributed springs. In this section, first of all, the modal analysis process of the multi-beam model is given.…”

“…The acorrding modes are named as tranverse modes. The detailed qualitative analysis and parameter analysis of the transverse mode shape can be found in the previous work [23].…”

“…Consequently, in addition to improving hinge joint performance in terms of design, it is more important for ACMGBs in service period to identify hinge joint transmission function in time, evaluate TCWP, and carry out appropriate hinge joint maintenance. The hidden hinge joints assessment methods are divided into four ones: visual inspection, load test [18], nondestructive testing [19,20] and structure health monitoring (SHM) [21][22][23][24][25][26]. The first three methods above can hardly indentify the early disease in hinge joints in time.…”

“…In the authors' previous work [23], it's deduced that there is one-to-one correspondence in shape between TSMS and TDMS of the multi-beam system according to the transformation relationship between euler beam displacement and strain. However, as obsevrd between Fig.…”

Joint deterioration detection based on field‐identified lateral deflection influence lines for adjacent box girder bridges

“…Foroozandeh and Ariaei 19 studied a spring‐connected parallel beam and analyzed the dynamic performance of the system. Dan et al 20 used springs to simulate bridge joints as a way to consider the change in vibration characteristics due to joint damage and used them for damage identification of joints. In summary, spring is a good tool to simulate joint, which can reflect the change of shear stiffness when joint is damaged.…”