Analysis And Simulation Of Nonlinear Static And Dynamic Hybrid Theory And The Boom System

The demands for high-level，super high-rise buildings rescue and fireextinguishing and working high above the ground are increasing，so hundreds ofmeters level elevating platform fire engines have become indispensable fireequipments. The structure of the hybrid jib is the important component and keyfunction part of the elevating platform fire engine，which can ensure operatingprecision，range，bearing capacity and degree of safety. The jib design standardswill directly affect our fire control products’ international standing. At present，there are less scholars of our country to research the theory of static anddynamic design of the hybrid jib structure for elevating platform fire truck， andthere is no mature design standards and design handbook. DG113m aerialplatform fire truck as the research object，the pros and cons of different staticand dynamic theories and methods is researched. Different theoretical analysisresults provide not only an important theoretical reference for the realization ofthe jib structure lightweight，safety and economization but also an importanttheoretical basis to draft and revise for elevating platform fire truck standards.At the same time，the results provide an important reference value for the similarboom structure of static，dynamic research. The paper includes the followingaspects:（1）A set of suitable and scientific load combination form is put forwardaccording to the characteristics of the hybrid jib structure of elevating platformfire truck， considering load properties， steel performance， workingcharacteristics of the structure and taking the selection method of partial loadfactors，dynamic amplification factor，Resistance coefficient andHigh-riskcoefficient of the arm crane;（2）Using three kinds of stresse（sallowable stress[]，ultimate stresslim and calculated stress）as parameters，taking the maximum safety of allowablevalues and calculated stress the purpose，the suitability and practicability of fourkinds of design theories and methods（allowable stress method based on lineartheory，allowable stress method based on nonlinear theory，limit state methodbased on linear theory and limit state method based on nonlinear theory）were studied by means of more theoretical calculation of super-long hybrid jibstructure of the elevating platform fire truck and using multiple points of view tocompare these method to get the optimal theory and method. And withVisualC++as a development platform，the parametric theory design system ofthe hybrid jib structure is developed completely;（3）The shell element model of the jib structure and the entity model ofthe slider are established for DG113m elevating platform fire truck based on thefinite element software of solidworks/simulation. Three kinds of nonlinear（geometric， material and contact nonlinearity）and coupling problem of thestructure of the jib are analyzed according to the model to verify the strength，stiffness calculation results of optimal theory and method;（4）The results of the linear transient response and the nonlinear dynamicresponse of the jib structure are researched under impact load to select muchmore appropriate dynamic response analysis methods for the hybrid jib structureof hundreds of meters level elevating platform fire truck;（5）The science of the4kinds of design theories and methods is validatedthrough the strength test of the hybrid jib structure for DG113m elevatingplatform fire truck.