Steel Structure Design of a Multi-Story Comprehensive Service Building with Long Cantilever Trusses
This study examines the steel structure design of a multi-story comprehensive service building employing a steel frame-brace-long cantilever system.The structure features multiple interruptions in second-story columns,resulting in large cantilever and long-span structures on the third floor,reduced effective floor width due to significant floor openings,and various seismic vulnerabilities despite being a multi-story building.By employing a rational truss layout and leveraging the combined strength of multiple trusses,the design optimizes load transmission paths,resolving issues related to vertical deformation and load-bearing capacity in extensive cantilevered areas.Vertical vibration peak acceleration in large cantilever and long-span corridor structures was validated through floor comfort analysis.The design incorporates elastic time-history analysis,elasto-plastic analysis,seismic performance-based design,buckling analysis of steel supports at the roots of large cantilever trusses,anti-progressive collapse calculations,multi-scale joint stress analysis,and complex floor stress analysis.These calculations and reinforcement measures ensure the long cantilever truss system achieves reliable seismic performance.
Long Cantilever StructureFloor ComfortJoint AnalysisCollapse Prevention DesignComplex Floor Stress
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