'Comparison of performance of High-strength to Normal-strength Reinforced Concrete Slab under Blast Loading using Experiments and Finite Element Modeling' is a research study conducted at University of Missouri - Kansas city

1. Comparison of performance of High-strength to Normal-strength Reinforced Concrete
Slab under Blast Loading using Experiments and Finite Element Modeling
Author: PI: Ganesh Thiagarajan
Gunjan Shetye Associate Professor,
Graduate Student Civil Engineering, University of Missouri-Kansas City
Civil Engineering, University of Missouri-Kansas City (Grant # 748085, Hazard Mitigation and Structural Engineering )
The Problem Objective Finite Element Modeling in LS-DYNA Experimental and Numerical Model comparison
 Civilian structures around the world have  The study focusses on  Finite element model of the Figure 1: Crack propagation behavior and comparison with experiment for Slab#2
been targets of aggressor attacks in the two types of reinforced slab was generated in LS-DYNA
past and recent times. concrete (RC) slabs, pre-post .
namely high strength  3 mesh sizes were applied.
 Threat to human life. concrete reinforced with  Support conditions as per the
high strength steel experiment were provided by
 Blast resistant design has been applied to (HSC-VR) and normal restraining the nodes.
military structures in the past. strength concrete reinforced with normal strength steel (RSC-R).  Blast surface was defined on the
 The effect of reinforcement ratio on the response is also considered model.
 The need of the hour is to transfer by looking at two different reinforcement ratios for each slab
blast-effects mitigation technologies combination.
Geometric models Damage patterns observed in Winfrith
Concrete Model.
Damage patterns observed in the
from military to civilian applications. Alfred P .Murrah Federal Building after the Bombing
 Finally, slabs with a single layer of reinforcement steel in the experiment
Incident
Courtesy: http://en.wikipedia.org unloaded face and a double layer of steel in both the loaded and
unloaded blast face will be compared.
Measures
 Conduct experimental and analytical studies on structural systems
Scope
which represent conventional civilian buildings and construction  An experimental investigation was carried out on 12 RC slab
practices. panels, each panel of size 64” X 34” X 4” having combination of
HSC-VR and RSC-R were tested by applying blast pressures in a
 Use computer based modeling to asses extent of damage to Shock Tube (Blast Load Simulator).
building’s structural components.
 The same set of 12 slab panels are numerically modeled using Finite
 Conduct research and testing of common building materials such as Element Modeling in LS-DYNA using mainly two material models
regular strength concrete and conventional steel rebar. which are Concrete Damage Model Release 3 and Winfrith concrete
Model.
Introduction
 Two different reinforcement ratios for two different bar spacing are Note: Results for deflection of slabs for experiment and LS-DYNA cannot be disclosed here as they are a part of blind prediction contest under the
 The project aims to conduct experimental and analytical study of being studied and also two types reinforcement configuration, single research project.
the components of a conventional civilian structural system and double mat which are widely used are considered.
components: slab, columns and beams for blast loading. Material models in LS-DYNA Discussion and Conclusion
 Comparison of results obtained in the Experiment is compared
 The analytical study is through two numerical modeling procedure: with Finite Element Analysis results.
1. Single Degree of Freedom Methods
Experimental Investigation
SBEDS/CEDAW:
Programs widely used Blast Load Simulator (Shock Tube)
by structural engineers RC slab
http://www.mfg.mtu.edu/cyberman/machtool/mac
panel
htool/vibration/x2.gif
mounted in
2. Advanced Finite Element Modeling target vessel
LS-DYNA:
A non-linear transient
dynamic finite element
analysis program Future Work
Slab model in LS-DYNA
RC slab panel
Blast load application
RC slab panel (back
Research significance view) response
mounted on
supporting
under blast loading frame Numerical Simulation
 The research presented aims at strengthening a component of
structural system, a reinforced concrete slab by using high
LS-DYNA Simulation results displaying contours of stress distribution
performance material.
 The effectiveness in resisting blast loading of such a strengthened
slab is being analyzed using computer based finite element modeling
in LS-DYNA.
Acknowledgement
 An experimental investigation was carried out on 12 reinforced
concrete slab panels by subjecting them to pressure conditions
equivalent to those in a blast event as generated by a shock tube
(Blast Load Simulator).
 The behavior of these slabs is recorded in terms of the total
displacements, strain and acceleration. The post-test observations of
this slabs investigated the failure crack patterns in detail. a. Damage Rel3 Model b.Winfrith Concrete Model
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12 sets of RC slab panel post-test images