Strains Capacity (TBDY)

The value for the strains capacity of rectangular beams, columns and walls is calculated through different expressions, depending on the state of damage in the structure.

Performance levels of Continuous Use (KK) and Immediate Occupancy (HK)
The value for the strain capacity for the performance levels of continuous use (KK) and immediate occupancy (HK) is defined by the following equation 5.8a of TBDY:

Performance Level of Life Safety (CG)
The value for the strain capacity for the performance level of life safety (CG) is calculated from the following equation:

Performance Level of Collapse Prevention (BP)
The value for the concrete strain capacity for the performance level of collapse prevention, ε_c^(GO), is calculated according to the following equations of TBDY:

For rectangular columns, beams and walls:

For circular columns:

and the value for the steel strain capacity for the performance level of collapse prevention, ε_s^(GO), is calculated according to equation 5.5 of TBDY:

FRP Wrapping
The contribution of the FRP wrapping to members’ strain capacity is taken into account according to section 15B.3 of the Appendix 15B of TBDY.