8B. ANALYSIS PART 2

CHAPTER 8B 'ANALYSIS' 119 in order to use the slopes of its two branches to calculate the eigenperiod and the corresponding spectral acceleration. Selecting it displays the following dialog box There are two methods for calculating the bilinear curve: • The " simplifying " one, with values as provided by the CANEE and entered in the parameters discussed below • The " equal area method ", where these parameters are used as the starting positions to determine the bilinear. The first parameter concerns the slope of the second branch, with the • simplifying method: fixed • method of equal areas: as a starting slope. With a value of 0 the second branch will be drawn horizontally in both methods. Option Ke refers to the starting slope of the first branch, with the - simplifying method: fixed - method of equal areas: as a starting slope. The " Negative gradient (a) " refers to the second branch: with a value of 0, is automatically calculated with a threshold of 0.10 as provided for in the CANEP, while