Punching behaviour of RC flat slabs under reversed horizontal cyclic loading

Reversed horizontal cyclic loading tests of flat slab specimens with studs as shear reinforcement

“…Based on the geometry and conditions of the test setup, the unbalanced moment and the drift ratios are directly obtained by respectively multiplying the horizontal force and dividing the horizontal displacement by the total height of the column. The hysteretic diagram of specimen C‐Ref is very similar to that of the specimen C‐50 reported in Almeida et al and tested using the same test setup. From the figure, it is noticed that the hysteresis diagrams were stable for all specimens.…”

“…Detailing of the top and bottom bars is given in Figure . The longitudinal reinforcement and instrumentation used was similar to that of the slab specimens without shear reinforcement described in Almeida et al…”

“…However, they use simplified boundary conditions, such as borders that are free of bending moments and vertically fixed, which lead to a static position of the zero‐moment line and the inability to have bending moment redistribution . To overcome some of these limitations, a different test setup has been developed at Department of Civil Engineering, Faculty of Sciences and Technology, Universidade NOVA de Lisboa (DEC/FCT/UNL) . This setup allows vertical displacements at the slab borders; equal magnitude of shear forces, bending moments and rotations at the slab borders; mobility of the line of inflection location along the longitudinal direction and the possibility of applying high vertical load ratios.…”

“…The subassembly used for this purpose is denoted as (3) in Figure a. A more detailed description of this test setup can be found in Almeida et al…”

Behavior of RC flat slabs with shear bolts under reversed horizontal cyclic loading

“…Throughout the last decades, reinforced concrete flat slab structures have been abundantly used all around the world, however, it has been proven to sometimes do not behave satisfactorily under seismic actions. Several researchers such as Hanson and Hanson, Hawkins and Mitchell, Symonds and Mitchell, Robertson and Durrani Durrani and Du, Almeida et al, Gouveia et al, Inácio and Isufi et al performed experimental tests that subjected flat slabs specimens to combined vertical and cyclic horizontal loads. These types of structures showed limited horizontal drift capacity and ductility under horizontal loading, especially if it is combined with gravity loads.…”