Mechanical Properties of Segmental Steel-UHPC Composite Deck Panels for Long-Span Cable-Stayed Bridge
Ultra-high Performance Concrete exhibits much higher compressive strength than the normal concrete,the application of which brings benefits associated with self-weight reduction of bridge structures.This paper presents a segmental composite deck structure that consists of the orthotropic steel deck plates and UHPC layer,applicable to long-span cable-stayed bridge,where the UHPC layer not only participates in but also contributes to the dead-load-carrying performance of the main girder.The orthotropic deck plates are connected with the UHPC layer by the group PBL connectors with low,notched perfobond ribs.The Danjiangkou Reservoir Bridge was used as a case.The static performance and influential factors of the proposed composite deck structure in the full bridge as well as in a main girder segment were analyzed in a finite element model.The anti-shear safety of the shear connection was evaluated.As per the analysis,the design of the segmental composite deck structure consisting of orthotropic steel plates and UHPL layer is governed by the tension of the UHPC layer and the compression of the orthotropic steel deck plate.As a constituent of the main structure,UHPC layer can effectively reduce the stress level of the orthotropic steel deck in the first system.To properly thicken the UHPC layer and U ribs and add secondary diaphragms is more effective in reducing the tensile stress in the UHPC layer and the compressive stress in the orthotropic steel deck plate,than thickening steel deck plates and diaphragms.Under the action of typical load combinations at the service stage,the maximum stresses in the UHPC layer and orthotropic steel deck plate can reach 68％-98％and 38％-86％of the corresponding stress limits,respectively,indicating good compliance with the design requirements and efficient material utilization.The transverse and longitudinal anti-shear safety coefficients of the group PBL connectors with low,notched perfobond ribs reach 12.3 and 4.0,respectively,indicating that the shear strength of the proposed connection details of the orthotropic steel deck plates and the UHPC layer could meet the design requirements.
cable-stayed bridgecomposite deck panelUHPCsegmental prefabricationPBL connectorstatic performanceinfluence parameterfinite element method
万方数据
维普
