8B. ANALYSIS PART 2

CHAPTER 8B 'ANALYSIS' 49 • In the " XZ Levels " section We define from which level to which level the horizontal seismic load will be applied. It is proposed that the upper level be defined as the last full level (not staircase ends). This level will include the control node , which will be either the bulkhead node or another node on the outer perimeter of the building. The option ' Check for plasticisation below the reference level ', when ticked, takes into account as possible locations for plastic joints also elements below the reference level. • In the section " Seismic Combinations " We define the combinations for which inelastic analyses will be performed. Each combination means that a seismic force will be applied in the specific direction (x or z) with a factor of 1 and a seismic force in the transverse direction with a factor that you specify in the " Transverse load factor " field. The default value is 0.3. We also determine the type of distribution of the seismic force along the height of the building (triangular or rectangular). The CANPE requires both seismic distributions. Also, if we want to take into account, in addition to the seismic forces, moments resulting from the accidental eccentricities, then we activate the fields " Accidental eccentricities Eh and Ez ". • " Select Base Cutting Force from Design Spectrum " when checked, uses as base cutting force the one calculated by the dynamic analysis. OBSERVATION: Selecting all combinations with the random eccentricities produces a total of 64 combinations which means 64 inelastic analyses resulting an increase in vector resolution time.