基于物元云模型的黄土震陷灾害下桥梁易损性评价OA

To objectively and accurately investigate the hazards of loess geological environments and seismic subsidence on in-service concrete bridges and to implement corresponding mitigation mea-sures,it is particularly important to conduct a vulnerability evaluation of in-service concrete bridges under loess seismic subsidence disasters.Based on the geological conditions and environmental char-acteristics of the loess region in Gansu Province,bridges in this region were situated in Grade IV self-weight collapsible loess and seismically unfavorable zones,necessitating targeted analysis and re-search on their distress issues.Integrating the DPSR model with four aspects of geological condi-tions,response degree,detected damage extent,and maintenance capability,a comprehensive multi-level evaluation indicator system was developed,and vulnerability grading criteria were defined.The matter-element cloud theory evaluation method was introduced.The cloud model,which transformed linguistic values and numerical domains through uncertain relationships,was combined with the mat-ter-element model that resolved incompatibility among indicators.By calculating the digital parame-ters of the matter-element cloud,connection cloud diagrams were generated.The connection degrees of the matter-element cloud were used to construct a connection cloud extension matrix,obtaining the connection degrees between the matter-element indicators to be evaluated and vulnerability grades.By combining weights to comprehensively evaluate the vulnerability grades,an evaluation model based on the connection cloud matter-element extension theory was constructed.This model was ap-plied to evaluate the vulnerability of a concrete bridge in Gansu Province.The results indicated that the in-service concrete bridge under loess seismic subsidence disaster had a vulnerability grade of IV.The bridge demonstrated relatively good stability,and the evaluation results were generally consis-tent with the actual condition of the bridge,demonstrating the effectiveness and applicability of this method for vulnerability evaluation of in-service concrete bridges under loess seismic subsidence disas-ter.This approach provides a decision-making basis for maintenance and reinforcement of in-service concrete bridges in such environments.