EXAMPLE 6. BUILDING VALUATION & REDESIGN STUDY

EXAMPLE 6: "STUDY FOR THE VALUATION AND REDESIGN OF A BUILDING ACCORDING TO THE CANC. 86 (CAN.EPE)§5: The equivalent lateral stiffness Ke is obtained as the occupant stiffness corresponding to a force equal to 60% of the yield strength Vy which is defined by the intersection of the lines mentioned above. The reduced slope (a) of the second branch is determined by a line passing through the point of the (real) non-linear resistance curve corresponding to the failure displacement (δu), beyond which a significant reduction in the strength of the beam is observed (Fig. In all cases the resulting value of α must be positive (or zero), but not exceed 0.10 (to be compatible with the other assumptions of the δt estimation method, such as the coefficient C1, see Fig. 5.2). § 5.5.5.2b and § 5.7.4.2a). The recommended value for the percentage reduction in strength is 15%, provided that no failure of a main vertical element has occurred at this level (in which case the bilinearisation shall be performed at the displacement corresponding to this failure). Simplistically, and since no estimation of the available ductility of the building is required, the slope Ke can be taken as the passenger value for a resistance level equal to 60% of the maximum resistance (Vmax), and the yield strength Vy, for the calculation of the R index relation (S5.7), as 80% of Vmax. ❖ The first parameter concerns the slope of the second branch, which is: - With the simplification method: constant - By the method of equal areas: as a starting slope. With a value of 0 the second branch will be drawn horizontally in both methods. ❖ The Ke option refers to the starting slope of the first branch, which is: - With the simplification method: constant - By the method of equal areas: as a starting slope. ❖ The neglected slope (a) refers to the second branch: - with a value of 0, is automatically calculated with a limit of 0.10 as provided for in the EIA, while - with a user value , is plotted fixed at that slope. The default values of the program are the values provided for in the CAN.EPE. ❖ In the section "Type of building for the calculation of C1-C2" you select the type your building to calculate the above factors which are used for the calculation of the targeted movement. (CAN.EPE)§5.7.4.2: The target movement δt is allowed to be calculated based on the following relation (S5.6) and corrected as follows: δt= C0 C1 C2 C3 (Te2/ 4π2 ) Se(T) (Σ5.6)