Perimeter Security Design 4 4 1 Introduction P-Books Pdf

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m To expand the palette of elements that can gracefully or. unobtrusively provide perimeter security in a manner that does not. clutter the public realm while avoiding the monotony of endless. lines of jersey barriers or bollards which only evoke defensiveness. see Section 4 6 2 for an example of an innovative unobtrusive. security element, m To produce a coherent strategy for deploying specific families. of streetscape and security elements in which priority is given to. achieving aesthetic continuity along streets rather than solutions. selected solely by the needs of a particular building under the. jurisdiction of one owner or agency, m To provide perimeter security in a manner that does not impede. the city s commerce and vitality nor excessively restrict or impede. operational use of sidewalks or pedestrian and vehicular mobility or. impact the health of existing trees, Perimeter protection may participate in all three layers of defense. The first layer applies when the access control is outside the property. line The second layer applies when there is controlled access around. a building within the property line The third layer applies to under. ground parking or parking underneath a plaza see Chapter 6 Section. 6 4 It also applies when the access control is at the building face. Perimeter security protection is accomplished by design strategies that. use a variety of methods to protect the site The two following sections. provide some broad guidelines for the design of barrier systems and de. tails of the characteristics of barriers currently in use. 4 2 BARRIER SYSTEM DESIGN,4 2 1 Issues of Barrier Systems Design. he architecture and the landscaping of the site entry elements. are the first part and may be the only part of the project that is. visible As such they introduce the identity of the site and its ar. chitectural style and quality and impart a sense of welcome or stay away. Figure 4 1, Sidewalks should be open and accessible to pedestrians to the greatest ex.
tent possible and security elements should not interfere with circulation. particularly in crowded locations,4 2 Perimeter security design. Figure 4 1,Custom bollards match,the architecture at a. defended corner, Issues to be considered in the design of the barrier system include. m To ensure protection to the desired level the design and selection of. barriers should be based directly on the design base threat assessed for. the project as well as available countermeasures and their ability to. mitigate risk, m The barrier layout at sidewalks should be such that a constant clear. path of 8 feet or 50 of the sidewalk whichever is the greater should. be maintained, m For buildings with a yard security elements should be placed in or at.
the edge of the yard depending on available space and stand off. m All necessary security elements should be installed to minimize. obstruction of the clear path If it is necessary for space reasons to place. elements at the curb they should be placed in an available amenity strip. adjacent to most curbs since this space is already designated for street. furniture and trees and is not part of the existing clear path. m Any security or other object placed on the curb should be at. least two feet from the curb line to allow for door opening and to. facilitate passenger vehicle pick up and drop offs if this can be done. anywhere along the curb However the most effective placement. is at a maximum of two feet this allows the barrier to engage the. engine block and mass of an approaching vehicle before the tires have. impacted the curb and begun to launch it over the barrier Ideally. drop off points should be located in pull over or stopping points. where the setback is greatest At a distance of more than two feet the. curb can become a major factor in barrier height requirements and in. reducing their effectiveness,perimeter security design 4 3. m A bollard barrier system is less intrusive if it is short in length and. thoughtfully integrated into the entire perimeter security system The. bollard materials should harmonize with the building architecture. Figure 4 2 shows a small row of bollards protecting a building entrance. The custom designed stainless steel bollards harmonize well with the. building architecture,Figure 4 2,Stainless steel covers. on bollards harmonize,with the building, m Monotonous repetition of a single element should be avoided Block. after block of the same element no matter how attractive does not. create good design Figures 4 3 and 4 4 When a continuous line of. bollards approaches 100 feet they should be interspersed with other. streetscape elements such as hardened benches planters or trees. Figure 4 3,Monotonous,repetition of bollards,4 4 Perimeter security design. Figure 4 4,These bollards resemble a wall,SOURCE NCPC.
m Hydraulic barriers drop arm beams and the complete system including. security gatehouses are visually intrusive Wherever possible such entry. controls should be located in access roads and service alleys. m The use of a combination of barrier types establishes a flexible design. palette that responds to security requirements in accordance with. diverse perimeter conditions Figure 4 5,Figure 4 5. Top Combination of,low retaining walls,and low bollards. Bottom left,Combination of,oversize bollard,and large planters. placed on very wide,sidewalk Bottom,right Combination of. tree and bollards,perimeter security design 4 5, Opportunities to add a palette of elements such as varied bollard types.
engineered sculptured forms hardened street furniture low walls and. judicious landscaping can all assist in creating a functional yet attractive. barrier that will enhance the setting Solutions that integrate a number of. appropriate perimeter barriers into the overall site design will be more. successful Figure 4 6,Figure 4 6,A combination of,barrier types for. a variety of threat,conditions Vehicle,access to this building. is prevented by custom,designed bollards a,sculptured concrete. barrier fences and,SOURCE DESIGN DELLA,VALLE BERNHEIMER. ARCHITECTS, The graphic box following shows varied bollard sizes combined with other.
elements to reduce the monotony of a long curbside barrier system. BOLLARD VARIATIONS AS PART OF THE STREETSCAPE, Small and large bollards trees and plants In a few years. the trees will dominate the,streetscape right,Bollards trees and lamp. standards below,4 6 Perimeter security design, m The placement of barriers at corners driveways sally ports stairs and. handicapped ramps requires careful attention, m Barriers at the edges of soil slopes need to be investigated carefully. m Corners need creative design for example to, increase the area to account for pedestrian Corners can be vulnerable points for.
queuing while interspersing effective barriers vehicle bomb attacks They are often the. that can consist of non obvious objects area of greatest approach speed greatest. such as traffic signals signs lighting etc In number of approach avenues and most. addition corners can offer the opportunity to perpendicular impact Unless they are. consider barrier design in depth to facilitate carefully designed to impede bomb laden. pedestrian flow and protection while vehicles it may be possible for an attacker. preventing vehicle entry to drive onto the sidewalk and proceed. unimpeded to an intended target,Space for several functions are important consid. erations 1 pedestrians to circulate during the, green signal phase 2 a pedestrian holding area during the red signal. phase 3 vehicles turning the corner and 4 people joining in the. queue at the red signal phase These space requirements demand that. sidewalk corners be kept clear of obstructions Reduction of corner space. can lead to people using the roadbed as a waiting area Sidewalk corners. defined as the space created by extending lines to the edge of the side. walk should be free of objects No part of a corner curb cut should have. any security elements Wrap around corners stretches from the edge of. one curb cut to the edge of the adjacent one at rounded sidewalk cor. ners should not be permitted, m Emergency evacuation and access are important considerations. The primary goal of perimeter security is to provide facilities with a. layer of barrier protection However the same protection that keeps. dangerous vehicles or people away could also keep first responders. from approaching the building quickly and enabling people to exit. m Landscape materials can soften and naturalize the appearance of. many types of constructed barriers improving their appearance and. compatibility with the surrounding areas Figure 4 7. m When possible position gates and perimeter boundary fences outside. the blast vulnerability envelope, m For high risk buildings barriers should be provided at site and. building entries Vehicles should not be permitted to park next to the. perimeter walls of the secured area,perimeter security design 4 7.
Figure 4 7,Low and high,walls softened with,landscaping. m In case of an elevated risk vehicles can be used as very temporary. physical barriers when placed in front of buildings or across access. roads but they are very detrimental to the character of an entry when. used as a long term risk mitigation measure, Case Study 5 describes a large agency complex in Washington D C that. features an arcaded crescent that wraps around two sides of the building. and encloses an internal garden space This creative security barrier. makes a positive contribution to the urban environment. CASE STUDY 5 A MAJOR GOVERNMENT BUILDING,1 0 INTRODUCTION. This new government building using,innovative security barriers is located at. the intersection of two major streets in a,city s industrial area that is undergoing.
urban renewal The complex is designed,to engage the street edges with an. entrance across from a nearby transit,center Retail facilities border to the east. while a trellised garden wall to the south,animates the street edges in addition to. enhancing the perimeter security,4 8 Perimeter security design. CASE STUDY 5 A MAJOR GOVERNMENT BUILDING continued. 1 1 Project Scope, The building program includes general office space training rooms laboratories a library an.
auditorium underground parking and auxiliary services A three story planted arcaded crescent. wraps around the north and west boundaries enclosing an internal garden space Loading docks. and an inspection booth are integrated into the architecture and garden walls. 1 2 Project Team, Moshe Safdie and Associates with OPX Architecture Associate Architects. 1 3 Project Schedule,Completed in 2007,2 0 DESIGN APPROACH. 2 1 Issues Addressed,m Security needs of a major,government building. m Limited space in existing urban,2 2 Security Strategy. First Layer of Defense,m Unusual perimeter arcade which.
provides attractive integrated,m Entry controls and screening. Second Layer of Defense,m Walls with attractive security. Third Layer of Defense,m Building architecture incorporates. risk mitigation measures,3 0 BLENDING WITH THE NEIGHBORHOOD CONTEXT. m Nice transition from neighborhood low rise buildings. m Arcade and landscaped plaza adds amenity,4 0 INNOVATIONS AND BEST PRACTICES.
m A mix of barriers and deterrents designed within the context of the site and its surroundings. provides multiple layers of protection and creates an amenity for the neighborhood. m Security is part of the aesthetic of the architectural design an integral component instead of. an afterthought,perimeter security design 4 9,4 2 2 Barrier Crash Test Standards. There is a wide variety of design methods and devices that can be used to. provide protection The site risk analysis see Chapter 2 will provide in. formation on the nature of the threat to be mitigated and the designer. needs to know the relative performance of the methods that are available. so that appropriate choices can be made for the various conditions that. will be encountered Since this publication is primarily concerned with. protecting buildings from bomb carrying vehicles effectiveness in stop. ping vehicle entry is a critical performance parameter. The crash testing standard in common use was developed by the. Department of State DOS To obtain DOS certification the vehicle bar. rier must be tested by an independent crash test facility to meet DOS. standards The test specifies perpendicular barrier impact by a 15 000 lb. 6810 kg diesel truck, Initially the DOS standard provided for three levels of intrusion. m Level 3 Allows intrusion of the vehicle 36 inches 0 91 m into the. m Level 2 Allows intrusion of the vehicle 20 feet 6 1 m into the barrier. m Level 1 Allows intrusion of the vehicle 50 feet 15 2 m into the barrier. In February 2003 the standard was revised and levels 1 and 2 were de. leted The standard currently provides certification for three classes of. protection,Certification Class Speed mph Speed kph. K12 50 mph 80 kph,K8 40 mph 65 kph,K4 30 mph 48 kph. To become certified with a DOS K rating the 15 000 lb vehicle must. achieve one of the K rating speeds and the bed of the truck must not. building architecture m Monotonous repetition of a single element should be avoided Block after block of the same element no matter how attractive does not create good design Figures 4 3 and 4 4 When a continuous line of bollards approaches 100 feet they should be interspersed with other streetscape elements such as hardened benches planters or trees Figure 4 2 stainless steel

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