ABSTRACT
In the design of flat plate structures, special attention must be paid to the connection between the slab and the supporting columns. Despite extensive studies and improvement of codes in this subject, also there are problems about eva More
ABSTRACT
In the design of flat plate structures, special attention must be paid to the connection between the slab and the supporting columns. Despite extensive studies and improvement of codes in this subject, also there are problems about evaluation of flat slab systems. In this paper punching shear in flat RC slabs is evaluated. Therefore the connections are retrofitted against punching shear, such as studs and column head. It is noted that parametric study is provided by ANSYS software. Finally results of Finite Element Method are evaluated.
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Considering that the execution of column in two-way hollow slabs has some limitations especially in terms of architecture, so in some executions, the column has to be rotated, which will change the spherical balls spacing of the column edge and change the punching shear More
Considering that the execution of column in two-way hollow slabs has some limitations especially in terms of architecture, so in some executions, the column has to be rotated, which will change the spherical balls spacing of the column edge and change the punching shear capacity. In this field of study, no laboratory research and numerical analysis have been performed so far. In the present research , after calibration of ABAQUS finite element software to experimental results, the effect of square column rotation with different spherical balls spacing from column edge, on punching shear capacity and failure mechanism (areas prone to damage) in two-way hollow slab is investigated.The results present that by increasing the spacing of spherical balls from columnedge to (S ≥d) at different angles of rotation, the punching capacity increases and then stabilizes. Under conditions where the spherical balls' distance from the edge of the column is less than (d), the punching shear capacity is reduced by increasing the angle of rotation of the column. This is due to the presence of a damage-prone area at a distance less than (d).
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ABSTRACT
Concrete slabs are of the main components of the concrete structures. Implementing flat slab is more simple and economic than other ones owing to it’s ease of formatting. Furthermore, the flat More
ABSTRACT
Concrete slabs are of the main components of the concrete structures. Implementing flat slab is more simple and economic than other ones owing to it’s ease of formatting. Furthermore, the flat slabs mostly utilized in the buildings with relatively irregular plans of flat slab- column structures. Unfortunately, the typical structures are ready to punching are prone to shear failure, but such shear brittle failure can be controlled by reinforcing the shear. Shear bolts is a shear strengthening method the influence of which on the slabs has been investigated in the present study. In practical situations, it is often necessary to create openings in slab to allow electrical, water or air conditioning ducts to go through floors. The existence of openings and their form along with their dimensions and slab-column connections impact the strength and ductility of the slabs. These specimens were placed under vertical load and cyclic lateral loads. The vertical load for each specimen was kept and cyclic lateral load increased. When the peak tension created, displacement in different points of slab and ductility were compared among different specimens. The analysis results show that shear bolts can increase lateral peak load resisting capacity, the lateral drift capacity at peak load, and also the ductility of the slab-column connections. Shear bolts also change the failure mode of the slab-column connections. Shear bolts capacity of the slab resist the lateral loads increases. The square opening dimensions are smaller better and circular opening more ductility to square opening one with same space.
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