A method for effective beam widths of slabs in flat plate structures under gravity and lateral loads

This paper reports one phase of a research program at the University of Washington on the seismic response of flat plate to column connections. In particular the behavior of connections containing integral beam stirrup reinforcement in the slabs is discussed. The paper compares different approaches for designing that stirrup reinforcement, outlines the benefits of placing stirrup reinforcement in the slab, and gives guidelines as to the design and proper detailing necessary for that stirrup reinforcement. The effects of concentration of the flexural reinforcement in the immediate column region are also examined. Ductility ratios, energy absorption, energy dissipation, and degeneration of stiffness characteristics of the specimens are reported together with the lateral loads for first yielding and maximum capacity of the specimens.

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A numerical analysis on slender columns for flat-plate structures using finite element method (FEM) technique

IOP Conference Series Materials Science and Engineering ◽

10.1088/1757-899x/455/1/012096 ◽

2018 ◽

Vol 455 ◽

pp. 012096

Author(s):

Apoorv Choudhary ◽

Milind Malik ◽

Jay Prakash ◽

Ajay Kumar ◽

Sachin Tiwari

Keyword(s):

Finite Element Method ◽

Finite Element ◽

Numerical Analysis ◽

Flat Plate ◽

Plate Structures ◽

Slender Columns ◽

Element Method

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Behaviors of Repaired Edge Column Slab Connections after Punching Failure Using Normal and Non-Shrinkable (CAH) Concrete

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.845.166 ◽

2016 ◽

Vol 845 ◽

pp. 166-174

Author(s):

I. Ketut Sudarsana

Keyword(s):

Flat Plate ◽

Punching Shear ◽

Normal Concrete ◽

Plate Structures ◽

Shear Damage ◽

Concrete Mix ◽

Surface Confinement ◽

Strength And Stiffness ◽

Original Strength ◽

Punching Failure

Column slab connections in flat plate structures are critical part of the structure. Punching shear damage to the connections may occur during construction or post moderate earthquakes. To avoid demolishing overall structures with such damage, connections may be repaired to restore the original strength of the structures. This paper presents behavior of repaired edge column slab connections using normal concrete and non-shrinkable (CAH) concrete. Four edge connections of flat plate structure after failure were repaired using normal and non-shrinkable (CAH) concrete respectively for two connections. The connections were re-tested to fail under combined shear and moment. The results show that bonding agent Sika Top Armatec 110 Epocem gave an excellent bond between the old concrete and the repaired concrete in the tests of repaired edge column slab connection as there are no cracks observed along the concrete interface. The edge connections repaired using normal concrete can have similar strength and stiffness as the original connections when good curing is provided The edge connections repaired using an expansive CAH concrete exhibited less strength and stiffness compared to the original edge connections due to lack of surface confinement. The Superplasticizer used in CAH concrete (Mix. B) improves concrete expansion but reduce the strength of the repaired connections

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