Solution of Bullet Proof Wooden Frame Construction Panel with a Built-In Air Duct

Anatolijs Borodinecs,Aleksejs Prozuments,Aleksandrs Geikins,Vladislavs Jacnevs,Elina Barone

doi:10.3390/buildings12010030

Anatolijs Borodinecs, Aleksejs Prozuments + Show 3 more

Open Access

https://doi.org/10.3390/buildings12010030

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Journal: Buildings	Publication Date: Dec 31, 2021
Citations: 3	License type: CC BY 4.0

Affiliation: Riga Technical University

Abstract

The growing terrorism threats across the world play an important role in the design of civil buildings and living areas. The safety of personnel is a top priority in unclassified buildings, especially military buildings. However indoor air quality and thermal comfort has a direct impact on personal productivity and ability to concentrate on duties and affect the decision making in stress conditions. The use of wooden structures is becoming more common in the building construction, and application of wooden frame structures for the construction of new buildings as well as for retrofitting the existing buildings. Prefabricated wooded frame construction perfectly fits need of unclassified buildings, allowing significant reduction of construction time and integration of various active and passive elements, such as a fresh air supply duct. Within the scope of this paper a 12 mm thick ballistic panel made of aramid was tested. Ballistic panel, thermal conductivity, and fire resistance of wooded construction panel with embedded air duct were analyzed for the various modelled exterior wall solutions. The main advantage of the proposed technology is fast and qualitative modular construction of unclassified buildings, providing all modern requirements not only for safety, but also for the energy efficiency and indoor air quality. It was found that bullet proof aramid panels do not reduce overall fire safety in comparison to traditional construction materials. However embedded outdoor air supply ducts significantly reduces construction heat transfer coefficient.

Highlights

The safety of personnel is a top priority in unclassified buildings, especially military buildings
There are numerous materials which ensure bullet proof properties: bimodal nanostructured metals [5], polymer–matrix composites [6], para-aramid 3D angle-interlock fabrics [7] etc
One of the innovative solutions is to use bio composite armors made of high-density polyethylene (HDPE) reinforced with chonta palm wood micro-particles [8] or lightweight ballistic materials which are relatively new [9], or to use cross-laminated timber (CLT) [10,11] as ballistic construction material

Summary

Introduction

The safety of personnel is a top priority in unclassified buildings, especially military buildings. European legislation is forcing buildings and industry to switch energy systems to efficient, decarbonize and renewable based [1]. In order to maintain a healthy and comfortable environment for the occupants of the building, it is important to maintain a good indoor environment with highly efficient building envelopes and energy systems [2]. There are numerous materials which ensure bullet proof properties: bimodal nanostructured metals [5], polymer–matrix composites (high-density polyethylene and polypropylene reinforced with aramid fabric) [6], para-aramid 3D angle-interlock fabrics [7] etc. Aramid based ballistic panels were investigated in this study to ensure bullet protection and material integrity. The bullet action depends on the various layers of the aramid fiber materials [15,16,17]

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