| The collapse accident of structures occurred frequently in recently years, whichhas drawn great attention of engineering researchers. The progressive collapse ofstructures especially important long-span and high-rise building can cause heavydamage. Many researchers propose the design methods and conceptions of collapseprevention, and many countries have issued corresponding provisions to preventprogressive collapse of structures, the failure of critical components and itsperformance under dynamic load has drawn widespread concern. Experimental studyresearch of the beam-column assemblies were conducted to study the impactmechanical properties by using the drop hammer tester of Hunan University, and thenumerical analysis was carried out using finite element software ABAQUS. The mainresearch work is summarized as follows:(1) According to the FEMA350standard, two kinds of beam-to-columnconnections were designed, and the experiment study of the impact mechanicalproperties of the structure were further conducted, the failure mode of the differentbeam-to-column connections were examined, the development of specimendeformation and hammer impact force in the process of impact were analyzed.(2) The finite element model of the structure was developed by using finiteanalysis software ABAQUS, the impact force time history curve and the displacementtime history curve were compared with experimental ones respectively, which showsgood aggrement and proves the reliability of the estabilished finite element model.(3) Based on the experimental and numerical results, the dynamic developmentmodels of catenary action were carried out, then the author analysed the developmentof the internal force using the model, and compared the static platform value, which isseparated from the dynamic force, with the estimates, the exactly similar resultillustrates the rationality of the finite element static analysis model.(4) According to the test data and the finite element analysis results, the failuremode and the dynamic behavior of structures were carried out to effectively assessthe collapse resistance of structures. |
