Study On Seismic Design Method And Dynamic Performance Of Space Steel Pipe Truss Structure

Being developed from grid structure, steel pipe truss structure is a new structural formthat can make full use of material properties, and combines with the requirements of function,beauty and economic benefits perfectly, because of this this structure is extensively applied inthe world, but the research for it tends to specific engineering examples, there is no generaldesign calculation method, so it is necessary to further study steel pipe truss structure. steelpipe truss beam and arch are two main forms of space steel pipe truss structure, this articlemainly conducts a systemic research of dynamic property, dynamic response and seismicsimplified calculation method for two forms.In order to get pivotal impact parameters of steel pipe truss beam and arch, whichprovides the basis for the concept design of steel pipe truss structure, separately conductmodal analysis for natural vibration property of steel pipe truss beam and arch by ANSYS.The conclusion is depth-span ratios H/L, section aspect ratio W/H, hinged spacing S havecertain effects on dynamic property of steel pipe truss beam and arch. And then conductvariable parameters spectrum analysis for dynamic response of steel pipe truss beam and archseparately and the variable parameters include depth-span ratio H/L, section aspect ratio W/H,hinged spacing S. We can get the conclusion that depth-span ratio H/L influences dynamicresponse of steel pipe truss beam and arch markedly. When designing steel pipe truss beam,depth-span ratio should be controlled within1/28, aspect ratio should be controlled within1/2.3and hinged spacing should be controlled outside of4meters, but hinged spacing shouldnot be too big. When designing steel pipe truss arch, depth-span ratio should be controlled inthe range0f1/28-1/8, aspect ratio should be controlled within1/1.2and hinged spacingshould be controlled in the range0f outside of4meters, but hinged spacing should not be toobig.Additionally, define horizontal earthquake impact factor=steel pipe’s max maximumaxial force under horizontal earthquake/corresponding steel pipe’s axial force under staticforce. Conduct a spectrum analysis for steel pipe truss beam and arch under different siteclassification， seismic intensity and earthquake group. The conclusion is that siteclassification and seismic intensity have markedly influence on K, and earthquake groupinfluences K unobviously. When the steel pipe’s axial force under static force is known, it iseasy to get top boom’s, lower boom’s and web member’s maximum axial force underhorizontal earthquake.