Analysis of Military Protective Structures: a Framework for Quantifying Cost-Benefit of Existing and New Protective Systems
Total Page:16
File Type:pdf, Size:1020Kb
ANALYSIS OF MILITARY PROTECTIVE STRUCTURES: A FRAMEWORK FOR QUANTIFYING COST-BENEFIT OF EXISTING AND NEW PROTECTIVE SYSTEMS by Henry J. Crofoot, CPT, EN A thesis submitted to the Faculty and the Board of Trustees of the Colorado School of Mines in partial fulfillment of the requirements for the degree of Master’s of Science (Civil and Environmental Engineering). Golden, Colorado Date ___________________________ Signed: __________________________ Henry J. Crofoot Signed: __________________________ Dr. Shiling Pei Thesis Advisor Golden, Colorado Date ___________________________ Signed: __________________________ Dr. Terri Hogue Professor and Department Head of Civil and Environmental Engineering ii ABSTRACT The United States military is constantly evolving into an organization equipped by the latest technology and seeking the greatest protection per cost ratio for its members in harm’s way. While new protection methods are steadily produced by the Engineering Research and Development Command, most protective structure options fall into either very expensive or very labor-intensive structures with widely varying degrees of reusability and transportability. Furthermore, there is currently no widely accepted quantitative approach to help the decision- making process when choosing which system to use in a specific condition. This study will seek to create a framework which can be used to aid the decision-making process based on quantitative calculation of cost benefit of various protective systems. The framework will encompass resource metrics of man-hours, machine hours, and monetary cost. The calculations and assessments will also be affected by quantitative evaluations of military situations which can increase or decrease each value of resource metric. This study will also investigate the potential of using a mass timber product, namely Cross Laminated Timber (CLT) panels, as a protective structure that may be useful in certain military situations. While not designed to replace other systems, it is another option for military commanders and staffs to consider when choosing the most efficient and economical protection method for their soldiers. iii TABLE OF CONTENTS ABSTRACT...................................................................................................................................iii LIST OF FIGURES.........................................................................................................................vi LIST OF TABLES.........................................................................................................................vii LIST OF SYMBOLS....................................................................................................................viii CHAPTER 1 INTRODUCTION...................................................................................................1 CHAPTER 2 BACKGROUND AND BRIEF HISTORY OF PROTECTIVE STRUCTURES........................................................................................................8 2.1 Bronze Age and Early Warfare...............................................................................10 2.2 Medieval Combat...................................................................................................13 2.3 American Revolution and Napoleonic Warfare......................................................14 2.4 The World Wars.....................................................................................................17 2.5 Asymmetric Warfare..............................................................................................22 2.6 Modern Counterinsurgency...................................................................................24 CHAPTER 3 METHODOLOGY: SITUATIONAL ANALYSIS...............................................28 3.1 Resource Metrics....................................................................................................29 3.2 Protection Archetypes............................................................................................31 3.2.1 Sandbags and Pickets.............................................................................................31 3.2.2 Reinforced Concrete...............................................................................................32 3.2.3 Berms.....................................................................................................................34 3.3 Military Influence Factors......................................................................................36 3.3.1 Mission...................................................................................................................37 3.3.2 Enemy....................................................................................................................37 iv 3.3.3 Terrain....................................................................................................................39 3.3.4 Civil Considerations...............................................................................................40 3.3.5 Time and Troops Available....................................................................................40 3.4 Calculation of Resource Requirements – Quantitative Analysis............................41 CHAPTER 4 PRELIMINARY VALIDATION: EXISTING SYSTEMS................................... 43 4.1 Hypothesis..............................................................................................................43 4.2 Sandbags and Pickets vs. Reinforced Concrete......................................................44 4.3 Berms vs. Sandbags and Pickets.............................................................................47 4.4 Sensitivity Analysis – Conclusion..........................................................................51 CHAPTER 5 MASS TIMBER PROTECTIVE STRUCTURE...................................................53 5.1 Introduction to Cross-Laminated Timber (CLT)....................................................53 5.2 Preliminary CLT Bunker Design............................................................................55 CHAPTER 6 COST ANALYSIS FOR CLT PROTECTIVE OPTION.......................................59 6.1 Comparison and Analysis of CLT versus Reinforced Concrete..............................59 6.2 Comparison and Analysis of CLT versus Berms....................................................62 CHAPTER 7 CONCLUSIONS AND RECOMMENDATIONS.................................................67 7.1 Conclusions............................................................................................................67 7.2 Recommendations..................................................................................................69 REFERENCES..............................................................................................................................72 APPENDIX A SITUATIONAL ANALYSIS VARIABLES.........................................................73 APPENDIX B SUPPLEMENTAL ELECTRONIC FILES...........................................................77 v LIST OF FIGURES Figure 1-1 HESCO Bastion properties with real-world use for ammunition storage..................4 Figure 1-2 Use of temporary berms with soldier securing the perimeter....................................6 Figure 2-1 Historical flowchart of protection.............................................................................9 Figure 2-2 Samurai armor, as illustrated in historical texts from the 16th Century....................12 Figure 2-3 Schematic of Hoplite armor from ancient Greece...................................................13 Figure 2-4 Marksburg Castle, Germany, built 12th Century AD..............................................14 Figure 2-5 Entrenchments at the Battle of Vicksburg, 1863.....................................................16 Figure 2-6 Soldier in the trenches at the Battle of the Somme, 1916........................................18 Figure 2-7 German machine gun position along the Normandy coast, pre-invasion ...............19 Figure 2-8 Japanese pillbox, Iwo Jima, 1945...........................................................................21 Figure 2-9 Guard Tower at Xuan Loc, Vietnam, ca. 1968........................................................24 Figure 2-10 HESCO barrier protects soldiers executing duties in Afghanistan..........................25 Figure 3-1 Methodology Flowchart.........................................................................................28 Figure 3-2 Material Thickness for protection against direct and indirect fires.........................29 Figure 3-3 Example design for a two-soldier fighting position ...............................................32 Figure 3-4 Aerial view of a large area protected by berms.......................................................35 Figure 3-5 D7 dozer constructs the berm from Figure 3-4........................................................35 Figure 5-1 Generic CLT Panel Configuration..........................................................................54 Figure 5-2 CLT Bunker Proposed design, isometric views......................................................55 Figure 5-3 CLT Bunker Left Elevation View...........................................................................57 Figure 5-4 CLT Bunker Front and Rear Elevation View..........................................................57 vi LIST OF TABLES Table 3-1 Sandbag and Picket Archetype Military Influence Factors.....................................38