Multi-scale simulation study on pounding effects of spandrel structures in long-span deck-type arch bridges
The spandrel structures of long-span deck-type arch bridges are highly irregular girder-span structures,in which the pounding effects under earthquakes are not only different from ordinary regular girder bridges,but also affected by the deformation of the arch ring.To explore such pounding effects,the multi-scale simulation was carried out to incorporate the three-dimensional pounding-friction model and the plastic damage constitutive relationships of materials.A long-span arch bridge was selected as an example to investigate the pounding behavior and local damage characteristics of adjacent girders at the expansion joints and also between the girder and retainers.Furthermore,the influences of spandrel structure configurations were discussed on the pounding behaviors and the shear response of columns.The results showed that the simply-supported spandrel structure is prone to produce the maximum pounding forces at the expansion joints near the 1/4 spans.The spandrel girders tend to collide eccentrically due to the influence of the spatial deformation developed in the main arch,which causes serious damage to the exterior box girders.Whichever the spandrel structure configuration is adopted,the strongest pounding effect between the girder and retainers is mainly found near the arch apex.The spandrel structure configuration has a significant impact on the pounding behaviors.When the spandrel structure is continuous or piecewise continuous,the pounding forces generated both at the expansions and retainers can be significantly reduced,and the strongest pounding effect near the 1/4 spans can also be avoided.Therefore,the reasonable span distribution and separation of spandrel structures is an effective way to reduce the pounding effects of long-span arch bridges.
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万方数据
维普
