THE CONCRETE BRIDGE MAGAZINE

SUMMER 2017

ASPIRE is a quarterly magazine published by PCI in cooperation with the associations of the National Concrete Bridge Council. The editorial content focuses on the latest technology and key issues in the Concrete Bridge Industry.

Issue link: http://www.aspiremagazinebyengineers.com/i/844035

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F H WA 48 | ASPIRE Summer 2017 The Federal Highway Administration (FHWA) recently completed the first edition of its Bridge Security Design Manual. 1 The manual was developed through an FHWA indefinite delivery, indefinite quantity contract with HDR Engineering and written by subcontractor PEC Engineering. It is available on the FHWA website. The manual provides information for structural engineers, planners, owners, and others to incorporate effective strategies in bridge projects and make highway systems resilient against terrorist threats. These threats have been a growing concern in the United States since the September 11, 2001, attacks, and it has been shown by the Mineta Institute 2 and others that transportation structures are among the most popular targets for terrorist organizations. While previous infrastructure security research and practice have focused primarily on buildings, the limited bridge- specific design guidance suggests that bridges may not be well protected against the common loadings these terrorist threats can impart to bridge components. "The primary objective of this bridge security design manual is to present state-of-the-art guidance on bridge- specific security planning, extreme loading phenomenology and characterization, and protective design strategies to be used by the highway bridge community in terrorist threat vulnerability assessments of existing bridges, resilient design of new bridge construction, and emergency planning efforts." 1 The manual covers a broad range of topics, including security planning, material performance, blast phenomenology, mechanics of structural elements, dynamic response of structures, protective design guidance, example designs for several component types (such as concrete towers), and the use of the software tool, Anti-terrorism Planner for Bridges (ATP- Bridge). The chapters covering these topics are fairly well self-contained. For example, the reader who is interested in understanding protective design for a concrete tower can use that chapter and relevant sections on loading, materials, mechanics, and response to gain a reasonable understanding of how to design a resilient tower. Of particular interest to those who are new to this topic may be the chapters on planning, materials, and blast phenomenology. This information explores these topics from the bridge designer's point of view and provides background and fundamental principles that are carried forward into specific examples of protective design. The chapter on ATP-Bridge stands alone to describe the use of the software design tool developed by the U.S. Department of Homeland Security and the authors of the manual. ATP- Bridge is a practical, engineering-level software program capable of predicting the response and anticipated damage of critical bridge components subjected to a variety of threat scenarios. ATP- Bridge features flexible software architecture designed to be continuously updated with state- of-the-art research and intuitive, user-friendly functionality that aligns with practice. The protective measures described in the manual use FHWA Unveils New Bridge Security Design Manual by Steve Ernst, Federal Highway Administration Table of contents from the Bridge Security Design Manual. All Figures and Photos: Federal Highway Administration. • 1.0 INTRODUCTION – History of Terrorist Events Involving Transportation Infrastructure • 2.0 SECURITY PLANNING FOR HIGHWAY BRIDGES – Threat Mitigation Strategies • 3.0 MATERIALS PERFORMANCE Explosives • 4.0 BLAST PHENOMENOLOGY – Types of Explosions • 5.0 MECHANICS OF STRUCTURAL ELEMENTS – Conventional Reinforced Concrete Elements • 6.0 DYNAMIC RESPONSE OF STRUCTURES – Dynamic Analysis Process • 7.0 DESIGN GUIDANCE FOR REINFORCED CONCRETE COLUMNS • 8.0 DESIGN GUIDANCE FOR STEEL CELLULAR TOWERS • 9.0 DESIGN GUIDANCE FOR REINFORCED CONCRETE TOWERS • 10.0 DESIGN GUIDANCE FOR HIGH-STRENGTH STEEL CABLES • 11.0 DESIGN GUIDANCE FOR OTHER BRIDGE COMPONENTS • 12.0 ANTI-TERRORIST PLANNER FOR BRIDGES (ATP-BRIDGE) SOFTWARE – Dynamic Analysis of Reinforced Concrete Columns – Dynamic Analysis of Steel Cellular Tower Panels – High-Strength Steel Cables Table of Contents

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