8B. ANALYSIS PART 2

CHAPTER 8B 'ANALYSIS' 51 • In the " Calculate constant LS shear length value " option you specify: if the shear length of the elements will be calculated with a fixed value based on the their length in all steps, as prescribed by the CANEP* (ticked) or whether it will be calculated at each step of the inelastic analysis on the basis of the resulting intensive quantities, where Shear Length = M/V at the end section of the element, i.e. the distance of the end section from the zero point of the moments. • The parameter " Active stiffness " concerns the way of calculating the stiffnesses of the elements of the structure. The first step of the inelastic analysis calculates the intensive quantities from the permanent and mobile loads of the structure. The stiffnesses that taken into account for these quantities are multiplied by the coefficients specified in the scenario parameters in the " Members " option. In the second step of the inelastic analysis where the seismic load is applied, the program now gives three possibilities for this calculation: • Home : The stiffnesses of the elements will be maintained with unit factors in all steps of the process. • Calculation at each step : The CANEE provides at each step of the pushover one reduction of stiffness. This option recalculates at each step, regardless of whether or not a plastic joint has been created, the stiffnesses based on the provisions of the CANEPE. The value of the stiffnesses to which the impairment is applied is the original value and not the impaired value applied only in the first step. • After the plastic joint : This option is the same as the previous one with the difference that the impairment takes place after the plastic joint has been created. Until the step this element retains the rigidity of the first step. OBSERVATION: For the M.I.P. masonry, the Home is always taken regardless of the from option.