06-09-2010, 05:10 PM
1. EC8 allows you to choose primary and secondary members for seismic resistance. In the case of secondary elements, their strength and stiffness can be neglected. This elements may not be designed according to the rules for primary structural members. So if you have a structural wall system which takes practically all the lateral load, other members can be designed as secondary members.
2. Increase the reinforcement in the column and/or the dimensions of the column until you satisfy the capacity design checks.
3. If you do a non-linear dynamic analysis you will see that hinges can appear in columns. If this is the case the overall stability of the building is not jeopardized. Also, plastic hinges can form in the top story columns (the codes allow the situation). The formation of plastic hinges in columns will lead to story mechanisms (any form of brittle failure is excluded).
4. An adequate amount of reinforcement is the minimum amount of reinforcement according to the seismic design code.
2. Increase the reinforcement in the column and/or the dimensions of the column until you satisfy the capacity design checks.
3. If you do a non-linear dynamic analysis you will see that hinges can appear in columns. If this is the case the overall stability of the building is not jeopardized. Also, plastic hinges can form in the top story columns (the codes allow the situation). The formation of plastic hinges in columns will lead to story mechanisms (any form of brittle failure is excluded).
4. An adequate amount of reinforcement is the minimum amount of reinforcement according to the seismic design code.