8.1 Behavior of a steel frame 目 03Hblngtieecgerespons8sof "Fuse"Concept should be Adopted! "Fuse"concept for developing ductile behavior 8.1 Behavior of a steel structures Detail 'fus d to kee capacity to prevent from collapse. 8.2 Design of steel frames 8.2.1 Structural systems 8.2.2 Requirement for arrangement of steel structural system 8.23 Calculation of earthquake action 8.2.4 Cheek for the seismic capacity of members and co e te H<110m.30 stories 33 Fi F 1 D F n SFi D 8.1 Behavior of a steel frame To Survive Strong Earthquake without Collapse: “Fuse” Concept should be Adopted ! Q3: How to achieve ductile responses of steel building structures? “Fuse” concept for developing ductile behavior • Choose frame elements ("fuses") that will yield in an earthquake. • Detail "fuses" to sustain large inelastic deformations prior to the onset of fracture or instability (i.e. , detail fuses for ductility). • Design all other frame elements to be stronger than the fuses, i.e., design all other frame elements to develop the plastic capacity of the fuses. In general, the common building steel structures are designed to keep elastic when subjected to the influence of frequently occurred earthquake, while when subjected to expected rare earthquake the structure should keep their capacity to prevent from collapse. 8.1 Behavior of a steel structures 8.2 Design of steel frames 8.2.1 Structural systems of middle and high rise buildings 8.2.2 Requirement for arrangement of steel structural systems 8.2.3 Calculation of earthquake action 8.2.4 Check for the seismic capacity of members and connections 8.2.5 Detailing requirements for seismic design of members 8.2.6 Seismic check and detailing requirements of joint and connection Profile Plan 1. Moment resisting frame Moment resisting frame is the structure that is composed of beams and columns. The horizontal forces caused by earthquake are transferred to foundation through beams and columns. H<110m, 30 stories. 8.2.1 Structural systems