An Efficient Model for Seismic Analysis of An Efficient Model for Seismic Analysis of Flat Slab Structures with Flat Slab Structures with The Effects of Stiffness Degradation The Effects of Stiffness Degradation Seung Jae Lee Seung Jae Lee Sungkyunkwan University Sungkyunkwan University
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An Efficient Model for Seismic Analysis of Flat Slab Structures with The Effects of Stiffness Degradation Seung Jae Lee Sungkyunkwan University.
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An Efficient Model for Seismic Analysis ofAn Efficient Model for Seismic Analysis of
Flat Slab Structures withFlat Slab Structures with
The Effects of Stiffness DegradationThe Effects of Stiffness Degradation
Seung Jae LeeSeung Jae Lee
Sungkyunkwan UniversitySungkyunkwan University
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Introduction
• The columns directly support the flat slabs without beams.
• Providing lower story height, good lighting and ventilation
• Remarkable lateral stiffness degradation in the slab
Flat slab structure having capital and drop panel
Drop panel
Capital
Flat slab system
2
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Width of the equivalent frame
y
x
Equivalent frame widthin the y direction
Equ
ival
ent f
ram
e w
idth
in th
e x
dire
ctio
n
h
c1c2Floorheight
Columnabove
Columnbelow
Slab strip
Slab strip
l1
l2
• Widely used for analysis of flat slab structures in practical engineering
• Slab is modeled by equivalent frame
• Elastic analysis is performed
• Effective width proposed by Jacob S. Grossman is commonly used
Equivalent frame method
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• Investigate limitations in the Equivalent Frame Method
• Propose an efficient analysis method using FEM
Reduce modulus of elasticity
Include stiffness degradation in the slab depending on lateral drift
Use super element and fictitious beam
Reduce computational time and memory
Objectives
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: Length of span in direction parallel and transverse to lateral load
: Size of support in direction parallel and transverse to lateral load1C ,