Deformations-Stresses

Frame model

In order to understand the concepts of the static and seismic behavior of the buildings, a single-storey structure is examined. The structure consists of two frames (each frame consists of two columns connected to one beam) and a slab. Foundations are not taken into account, while columns are considered fully restrained (fixed) at their base.

The structure consists of four columns, two beams and a slab (project B_331) [*]NoteThe educational version of the related software runs the project <b_331>.

Τhe load of the slab covering is g_e=1.00 kN/m².

Τhe imposed (live) load on the slab is q=5.00 kN/m².

The additional linear load on each is g_w=20.00 kN/m.

The design seismic acceleration applied to the centroid of the diaphragm is a_x=0.650·g [*]NoteThe seismic acceleration a_x on this level is result of the earthquake acting in X direction. Each mass m that belongs to this level reacts with an inertial force F_x=a_x·m. The sum of seismic forces comprises the seismic loading of the structure for seismic action in +X direction. The same stands for +Y direction. In this example the structure is classified as inverted pendulum [see 6.1.5(6)] and belongs to seismic risk zone Z3 having a_gR=0.36g and fundamental periods along X and Y, 0.250 sec and 0.158 sec respectively. Therefore, a_x=a_y=0.720 [see the example of the 6.1.6