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Study and Implementation of Health Monitoring Process for Half-through and Through Arch Bridges
CHEN Huai;HE Rong;HE Wei;HU Feng
   2011, 31 (6): 172-175.   DOI: 10.3969/j.issn.1006-1355-2011.06.039
Abstract （1659）            Save
According to the structure characteristics of half-through and through arch bridges, the bridge health monitoring process and the concept of bridge health records are proposed. And the health indicators and characteristics of the bridge health records are analyzed. When monitoring the bridge health, the standard model and health records should be established firstly. Then, the inspection object and observation index can be determined, and the in-situ testing according to the monitoring process is carried out. Finally, comparing the measured data of each index with its reference value in the health records, the working condition of the bridge can be analyzed. Taking Liujiang Bridge on Beijing-Hong Kong-Macao expressway as an example, the implementation of health assessment is illustrated. The monitoring results show that the 4th span of the bridge was in good health at that time.
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Study on the Influence of Suspender Damage on Mechanics Characteristics of Suspender Sestem in Through and Half-through Arch Bridges
HE Wei;HE Rong;LI Ya-wei
   2011, 31 (6): 24-28.   DOI: 0.3969/j.issn.1006-1355-2011.06.006
Abstract （1087）            Save
Suspenders are important force-transmission components of through and half-through arch bridges. Their mechanical situation is closely related to the safety of the arch bridges. Since suspenders can only withstand tension, their tensile forces and the safety of the arch bridge will change when a suspender damages. In this paper, based on perturbation theory, the changing laws of the tensile forces and displacements of the suspenders due to the suspender damage are studied by means of a three-dimensional finite element model. Taking Liujiang Bridge in Beijing-Hong Kong-Macao expressway as an example, this model is verified. Results show that when a suspender damages, its internal force will reduce, but the reduction ratio is less than its damage extent. The forces of the other suspenders of the same arch rib with the damaged suspender increase, but the increasing reduces rapidly as the suspender getting far away from the damaged one. The forces of the suspenders of the opposite arch rib essentially keep unchanging. The displacements of suspender joints also change due to the suspender damage, but the change ratio is less than the damage extent and gradually reduces as the distance between the undamaged hanger and the damaged one increased. As the damage extent of suspender increases, the rates of changes of both forces and displacements of suspenders increase too.
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