Progressive Collapse Analysis Of CRRC Culture Centre Of Science And Technology

With the rapid development of economy,the large space structure possess the feature of huge space volume and cover large open areas,which makes it being used more and more widely in the project construction such as railway station,exhibition hall and terminal.Even more,some of these buildings are regarded as the local landmark with high importance.Thus,the structure would easily concur progressive collapse when suffer the unexpected loading due to the failure of topical components,causing a large number of substantial losses.Therefore,it's necessary to consider the ability of anti-progressive collapse in the structural design process.This thesis uses a practical engineering project-CRRC culture centre of science and technology as a model,applying the AP method for progressive collapse dynamic analysis and evaluates the ability of the anti-progressive collapse.The main work could be expounded in the following respects:(1)This thesis introduces the research status and related regulations of structural progressive collapse analysis both domestic and overseas,summarizes the commonly used research methods in progressive collapse.It mainly introduces the research results in the field of large space structure,and the significance of this thesis.(2)This thesis introduces the theoretical basis of the progressive collapse design,including several commonly used analysis and design methods.The contents of the AP method are described in detail,including the method of screening the key components,the definition of the load and the judgment standard when the structure is collapsed.Besides,it lists the related influence factor about the DIF in static analysis.(3)This thesis use CRRC culture centre of science and technology as the model and selects failure components of the structure by sensibility analysis based on conceptual judgment.Then process dynamic analysis on the model by transient unloading method of equivalent loads,and discuss the proper value of equivalent loading time to as well as equivalent unloading time tp,then finish the analysis of progressive collapse.The results indicate that the max vertical displacement is 89.5mm,the max stress ratio is 0.89,which are both in accordance with strength criteria and deformation criteria.(4)Other than the mature research results on frame structure in progressive collapse,there's been various of details being discussed on dynamic magnification factor in the large space structure static analysis.This thesis take the actual engineering as the object of study,make comparison in vertical displacement between static analysis under different dynamic magnification factor and dynamic analysis.Moreover,this thesis analyzes the following elements systematically:max stress ratio,exterior load,damping ratio and equivalent unloading time,which would influence the dynamic magnification factor in the analysis of static progressive collapse.