Nonlinear finite element analysis of R.C slabs including membrane action

Dissertant

Ali, Ali Rashid

Thesis advisor

al-Husni, Hisham Muhammad

University

University of Technology

Faculty

-

Department

Department of Building and Construction Engineering

University Country

Iraq

Degree

Master

Degree Date

2013

English Abstract

Previous analysis of membrane action in R.C slabs of the sophisticated shapes and boundary restraints were attempted following classical methods of approach.

The obtained solutions from these studies are re-examined in this research by following a different course of approach, which is a numerical technique based on nonlinear finite element analysis.

Slab materials and boundary conditions are first modeled to enable applying ANSYS computer program to perform the required analysis.

Comparison of the present finite element results with corresponding results from existing experimental tests and previous theoretical predications verified the accuracy of the proposed finite element model.

Therefor this model is used in the present research to analyze membrane action in one-way R.C slab-beam system.

Two types of one-way R.C slab-beam panels are investigated.

In the first type (type 1), the slab is located at top of edge beams while in the second type (type2) the slab is located at mid-depth of edge beams.

It is found that panels type1 can carry higher ultimate loads than panels type2.

The effects of the two flexural stiffnesses of the edge beams (the vertical stiffness Kv and the horizontal stiffnesses Kh ) on the ultimate load capacity of these panels are also investigated which should higher ultimate loads for higher values of Kv and Kh.

A typical slab-beam panel of type1 is chosen to study the effect of some important parameters on its ultimate load and load-deflection behavior.

These parameters include concrete compressive strength fc , slab thickness ts , slab reinforcement ratio( p ) and steel yield stress fy .For a particular panel with certain values of these parameters, it is found that the ultimate load Wu of the panel is more than three times its corresponding Johansen‘s simple yield line theory load WJ .

This enhancement in load is attributed to the combined effect of bending and compressive membrane forces developing in the slab with continuing defection.

The ultimate load of the panel is also found to increase with increasing fc , ts , p and fy but since the corresponding Johansen‘s simple yield line theory load WJ increases much more than Wu , the load ratio Wu/WJ becomes smaller with increasing ts ,( p ) and fy but it is larger value of ( ??´).

Main Subjects

Engineering & Technology Sciences (Multidisciplinary)

Topics

• Building materials
• Concrete
• Reinforced concrete

• APA
• MLA
• AMA

Language

English

Data Type

Arab Theses

Record ID

BIM-417472