Development of a Simplified Blast Design Procedure and Response Limits for Load-Bearing Precast Wall Panels Subject to Blast Loads

2016 ◽  
Author(s):  
Thomas J. Mander ◽  
Barry L. Bingham ◽  
Michael J. Lowak ◽  
Michael A. Polcyn
Keyword(s):  
Design Procedure ◽  
Blast Loads ◽  
Load Bearing ◽  
Blast Design ◽  
Wall Panels

Finite Element Evaluation of Blast Design Response Criteria for Load-Bearing Precast Wall Panels

2015 ◽  
Vol 6 (1) ◽  
pp. 155-173 ◽  
Author(s):  
Joseph M. Nickerson ◽  
Patrick A. Trasborg ◽  
Clay J. Naito ◽  
Charles M. Newberry ◽  
James S. Davidson
Keyword(s):  
Finite Element ◽  
Response Criteria ◽  
Load Bearing ◽  
Blast Design ◽  
Wall Panels

Precast/Prestressed Concrete Experiments Performance on Non-Load Bearing Sandwich Wall Panels

2011 ◽  
Author(s):  
Clay J. Naito ◽  
John M. Hoemann ◽  
Jonathon S. Shull ◽  
Aaron Saucier ◽  
Hani A. Salim ◽  
...  
Keyword(s):  
Prestressed Concrete ◽  
Load Bearing ◽  
Wall Panels ◽  
Sandwich Wall ◽  
Precast Prestressed Concrete

scholarly journals Behaviour and Failure of Steel Columns Subjected to Blast Loads: Numerical Study and Analytical Approach

2018 ◽  
Vol 2018 ◽  
pp. 1-20 ◽  
Author(s):  
Haitham Al-Thairy
Keyword(s):  
Parametric Study ◽  
Analytical Approach ◽  
Numerical Study ◽  
Slenderness Ratio ◽  
Compressive Force ◽  
Design Procedure ◽  
Blast Load ◽  
Blast Loads ◽  
Steel Columns ◽  
Failure Patterns

The main objective of this study is the numerical simulation of the behaviour and failure patterns of steel columns under blast loads using the dynamic finite element package ABAQUS/Explicit. A numerical model is suggested and validated against published experimental tests on full-scale wide-flange steel columns subjected to dynamic blast loads under constant axial compressive force. Afterwards, the validated model is used to investigate the effect of important parameters on the behaviour and failure patterns of steel columns under blast pressure through an extensive parametric study. The parameters include the blast impulse, the blast energy, the blast load, the blast duration, the column boundary condition, the column slenderness ratio, and the blast direction. The conclusions extracted from this parametric study may be used to develop a thorough understanding of the behaviour and failure of steel columns subjected to blast load which, in turn, could lead to a more accurate practical design procedure. The study also presents derivations and validations of a proposed analytical approach to calculate the critical blast impulse at which a steel column losses its global stability. Comparison between the critical impulse-axial force curves obtained from the proposed equation and that extracted from numerical simulations indicates the validity and feasibility of the proposed equation.

Design guidelines and optimization of ultra-high-performance fibre-reinforced concrete blast protection wall panels

2020 ◽  
Vol 11 (4) ◽  
pp. 494-514
Author(s):  
Mohtady Sherif ◽  
Hesham Othman ◽  
Hesham Marzouk ◽  
Hassan Aoude
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
High Performance ◽  
Optimization Techniques ◽  
Blast Load ◽  
Fibre Reinforced Concrete ◽  
Blast Loads ◽  
Finite Element Software ◽  
Wall Panels ◽  
High Performance Fibre

Ultra-high-performance fibre-reinforced concrete is the latest generation of structural concrete, having outstanding fresh and hardened properties; this includes the ease of placement and consolidation with ultra-high mechanical properties, as well as toughness, volume stability, durability, higher flexural and tensile strength, and ductility. As more research is being focused on it, the material behaviour and characteristics are getting more understood, and the research demand for the special applications of the ultra-high-performance fibre-reinforced concrete is growing higher. One special application that ultra-high-performance fibre-reinforced concrete is thought to have an outstanding performance at is in the field of protective structures, specifically against blast loads. This article presents part of a study that is concerned with the behaviour and response of ultra-high-performance fibre-reinforced concrete wall panels under blast load. Size and shape optimization techniques were combined in this study to optimize the design of a 200-MPa ultra-high-performance fibre-reinforced concrete under blast loads using finite element modelling. This design optimization aims to maximize stiffness and minimize the cost while satisfying both design stresses and construction requirements. The design variable to be optimized for are the thickness ranging from 100 to 300 mm at 25 mm increments, in addition to the reinforcement ratio of 0%, 0.2%, 1% and 3%, and aspect ratio of 1, 1.5 and 2; the boundary condition is four edges fixed and restrained. The numerical simulation has been performed using an explicate finite element software package. The complete behaviour of an ultra-high-performance fibre-reinforced concrete is defined using the concrete damaged plasticity model. The concrete constitutive model has been developed considering the contribution of tensile hardening response, fracture energy and crack-band width approaches to accurately represent the tensile behaviour and guarantee mesh independence of results. The blast load is applied using the Conventional Weapons method of the US Army Corps of Engineers that is readily available in the finite element software. The validity of the numerical model used is verified by comparing numerical results to experimental data.

scholarly journals Research and practices of large composite external wall panels for energy saving prefabricated buildings

2019 ◽  
Vol 289 ◽  
pp. 10012
Author(s):  
Yunxing Shi ◽  
Yangang Zhang ◽  
Kun Ni ◽  
Wei Liu ◽  
Ye Luo
Keyword(s):  
Production Process ◽  
Energy Saving ◽  
Thermal Insulation ◽  
Sandwich Panel ◽  
Composite Panel ◽  
Sandwich Composite ◽  
Composite Panels ◽  
Load Bearing ◽  
External Wall ◽  
Wall Panels

The production process and application of large composite external wall panels (composite panels for short) are introduced in this paper. Composite panels with both load bearing and thermal insulation were formed by pouring normal concrete (NC) and ceramsite foamed concrete (CFC) continuously according to particular technological requirements, which made two layers into a seamless whole. The layers of NC and CFC are for load bearing and thermal insulation respectively. The composite panels were manufactured in the scale of industrial production, and applied to several energy saving prefabricated buildings successively, instead of polystyrene sandwich composite panels (sandwich panel for short) as external wall panels. There are several obvious advantages of the composite panel over the sandwich panel or outer benzoic board. Firstly, it solved the problems of durability of polystyrene and the complex production process of the sandwich pane, the production process of the external wall was thus greatly simplified. In addition, the fire risk was much reduced.

High Performance Precast Wall Panels with Shear Transfer Provided by Carbon Fiber Grid

2011 ◽  
Vol 84-85 ◽  
pp. 613-617 ◽  
Author(s):  
Yoo Jae Kim ◽  
Tom Harmon ◽  
Byoung Hee You
Keyword(s):  
North Carolina ◽  
Carbon Fiber ◽  
Flexural Strength ◽  
Design Procedure ◽  
Expanded Polystyrene ◽  
Composite Panel ◽  
State University ◽  
Shear Transfer ◽  
North Carolina State University ◽  
Wall Panels

Composite insulated wall panels using carbon fiber grid in combination with expanded polystyrene (EPS) insulation have been produced for over 5 years. The carbon fiber grid and the EPS act together to provide shear transfer between the wythes of the composite panel. A design procedure has been developed, based on testing at Washington University and North Carolina State University. The approach discussed here is to ensure that the flexural strength, the cracking moment, and the deflection are all within acceptable limits. This paper first discusses the testing that has been performed to develop the material properties used in the design procedure. Then methods for computing the flexural strength, the cracking moment and the deflection are also presented. Deflections are not often an issue and cracking moments can be easily controlled by the amount of prestress. Therefore, the most important concern is providing adequate shear transfer. The design procedures discussed here were later verified by full scale testing at North Carolina State University.

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