The amplification factor in ASCE 7-10 Section 12.2.3.2 (d), when used, applies to only the seismic component of the reaction forces, not the entire reaction-included gravity loads. Lateral forces in the longitudinal direction are typically resisted by the exterior walls and corridor walls. limit the maximum height of wood structural panel-sheathed shear walls to 65 feet above the base of the seismic force-resisting system (SFRS) in Seismic Design Categories (SDC) D, E, or F. In order to gain additional stories, increase building area, and stay within the allowable building and seismic system heights, the IBC and ASCE 7 each have provisions which enable podium designs. PODIUM DECKS RELIABLE, DURABLE, FAST BUILD FROM A SOLID CONCRETE FOUNDATION One of the fastest growing methods for urban retail and housing construction is podium structures. endobj And, although concrete is inherently durable, leaving it unprotected is an invitation for premature deterioration. STRUCTURE magazine is the premier resource for practicing structural engineers. American Society of Civil Engineers (ASCE). This article covers important design considerations and traditional approaches related to the design of a five-story wood-framed structure over a two-story concrete or masonry podium. One Kingdom Street has a steel frame, on a typical 12m x 10.5m grid, comprising fabricated cellular steel beams supporting a lightweight concrete slab on a profiled steel deck. Most industry standards require 1 to 2% slopes to address drainage issues of podium decks. Typically, they are exposed to all extremes of the weather. The two-stage analysis also allows the seismic base of the upper portion to be the top of the lower portion. Your project may have a shoring height of 8 foot or 80 feet, or a slab … The lateral load-resisting system consists of wood-frame shear walls for the upper stories and concrete shear walls for the lower story. <>/ExtGState<>/XObject<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 612 792] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> An R-2 occupancy above a Type 1-A construction, parking garage. - type of construction only for wood-framed buildings on top of podium. Concrete is taken off by the four elements that make up the structure. Rooftop and podium concrete decks are used for car parks, equipment plants, and similar situations. Special steel trusses were . endobj The concrete acts as a live load during the pours and on this project caused the steel to deflect up to 2” in some cases because no shoring was required. Figure 4. Using the flexible diaphragm assumption would allow distribution of diaphragm forces to shear walls to be based on tributary area. construction over a one-story concrete podium slab and is assigned to Seismic Design Category D. The gravity load framing system consists of wood-frame bearing walls for the upper stories and concrete bearing walls for the lower story. 9 0 obj <> covers the entire building. Wall rotation for shear walls typically includes the consideration of rod elongation, anchor slip, and the crushing effects at the bearing plate and wall plates. <> Similar force modifications for wind demands do not apply. On that basis, some confusion and lack of consistency exist regarding which type of diaphragm analysis should be employed for a given project. A fast, … 16 0 obj b) The period of the entire structure is not more than 1.1 times the period of the upper portion considered as a separate structure supported at the transition from the upper to lower portions. Shoring Systems. He is the author of The Analysis of Irregular Shaped Structures: Diaphragms and Shear Walls, published by McGraw-Hill and ICC. It is recommended that bearing plates, rod couplers and shrinkage-compensating devices be installed at each floor to provide a more efficient system and reduce story drift. ASCE 7-10 Section 12.3.1.1 (c) allows diaphragms in light-frame structures to be idealized as flexible when 1½ inches or less of non-structural topping, such as concrete or a similar material, is placed over WSP diaphragms, and each line of vertical elements of the SFRS complies with the allowable story drift of ASCE 7-10 Table 12.12-1. Deck Footings. IBC 2015 Section 510.2 allows an upper portion of any construction type to be built over a lower portion where the two portions are treated as separate and distinct structures. The requirement to waterproof is to protect the parent substrate, allowing for usage of the deck and the protection of the area underneath (from definitions). Because the International Building Code (IBC) treats podium … �P��� � Podium slabs are special type of floor system that transfers loads from a steel or wood frame structure above the slab to walls and columns below. endobj Contact publisher for all permission requests. <> <> Doug Thompson. Typical floor plans for mid-rise multifamily construction. PODIUM DECK AND PARKING DECK . If your deck calls for concrete … With ever-increasing land costs and the rising cost of steel and concrete… 2012 and 2015. International Code Council, Whittier, CA. %PDF-1.5 (For all other building requirements this is still one building because two residential stru ctures are interconnected by a common parking garage. In multifamily residential structures, a concrete Podium Slab typically acts as both a structural floor and as a transfer slab for wood and light gauge steel framed construction above. It has become increasingly important to consider the relative stiffness of diaphragms and shear walls, and the effects of multi-story shear walls as buildings become taller and more complex in shape. Figure 1. Table 12.6-1 of ASCE 7 only allows equivalent lateral force for certain characteristic. PONDS, PODIUMS, PLANTERS, WALKWAYS AND SERVICE DECK EDGWARE ROAD, LONDON THE WATER GARDENS Triflex (UK) Ltd @TriflexUK 01785 819119 www.triflex.co.uk info@triflex.co.uk Triflex (UK) Ltd. | Whitebridge Way | Stone | Staffordshire | ST15 8JS CASE STUDY. The sum of the lateral forces from the walls above is transferred to the walls below as shown in Figure 5. In North America, “podium” buildings, which include multiple stories of wood over an elevated concrete “podium deck,” have become especially prevalent. Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. By James Cooper, P.Eng., LEED AP O+M Owners, engineers, and contractors involved in the design, operation, maintenance, and restoration of parking garages and building podium decks … 15 0 obj STRUCTURE® magazine is a registered trademark of the National Council of Structural Engineers Associations (NCSEA). The last term accounts for rigid wall rotation. Podium decks … Thank you Bill Lellis Fire Marshal. As we’ve mentioned elsewhere, the culprit for premature deterioration is moisture. Structurally, ASCE 7-10 Section 12.2.3.2 provides a two-stage analysis procedure that can be beneficial for seismic design of podium projects. x��}�SS�����$�� Connection requirements to the podium slab are shown in Figure 4. Structural provisions in the American Society of Civil Engineers’ Minimum Design Loads for Buildings and Other Structures (ASCE 7) Podium construction—also known as pedestal or platform construction—typically includes multiple stories of light wood framing over a single- or multi-story podium of another construction style, which may include retail as well as above- or below-grade parking levels. Waterproofing of roofs is one of the most important structural requirements of any building. These allow you to provide secure 1st level or underground support for parking lots or administrative areas below sturdy wooden structures. “The ceilings were 9 feet with no fur downs since the open web truss system allowed for mechanical and exhaust ducts to run Several connector manufacturers now have joist hangers that are unique for this type of installation, which simplifies the process. Commercial buildings (e.g. PODIUM DECKS A podium deck can be used as an infill between and/or attached to building structures. ,m�Э�e1��.�����?^�iK��+�1Ȋ�l8s kPT�� :��(�9@[��|��)` Next, once all the floors are reviewed, areas of the building are defined for non-typical (Podium … And, although concrete is inherently durable, leaving it unprotected is an invitation for premature deterioration. Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. ASCE 7-10 Section 12.2.3 notes that, when combining different seismic-force-resisting systems in the same direction, the most stringent applicable structural system limitations of ASCE 7-10 Table 12.2-1 shall apply. endobj PODIUM DECKS A podium deck can be used as an infill between and/or attached to building structures. These materials use the following take off units in an estimate: Rebar - pounds or tons The second term accounts for shear deflection and nail slip. Podium construction can be an efficient and cost-effective way to meet the rapidly growing demand for student housing across the country. This article covers important design considerations and traditional approaches related to the design of a five-story wood-framed structure over a two-story concrete or masonry podium. PETRA, Incorporated is a recognized leader in Pre-Construction, General Contracting, Construction Management, Design-Build, and Concrete Services. 2015. If a rigid diaphragm analysis is warranted, the transverse walls would also act to resist torsional forces. Mid-rise structures using podium designs provide many opportunities for cost-effective, higher-density construction. Usually these slabs are … Typical mid-rise five stories of wood framing over the two-story concrete podium. My question will the R-2’s be protected with an NFPA 13 or 13R system. For buildings designed in jurisdictions enforcing codes preceding the 2015 IBC, this would require an alternate means and methods request approval by the Authority Having Jurisdiction (AHJ). These overturning forces are cumulative to the foundation. The requirement to waterproof is to protect the parent substrate, allowing for usage of the deck and the protection of the area underneath (from definitions). Recent Blog Posts. Reinforced concrete floor decks have become increasingly popular in homes over the last decade, and many of the floor systems used are adapted from commercial construction. We partner with developers and architects that run the gamut in terms of experience - from seasoned post-tensioned concrete podium … However, this method of framing has an increased potential for vertical shrinkage. Typical framing details for load-bearing wood-framed walls. endobj This can significantly affect multi-story shear wall stiffness and capacity. Podium slab construction techniques. �t} �lK5mH7M�U���iG��ҘV׹�l����t��i\�I1�i�q�'�E�dʦ��1�j9�vholB�9B�.M�����fL�-z7�j������n6� � �Z�*��r�ƽ�큂����j� sΠ[�J���� Roofdex HB is water-based with ultra-low VOC levels, which means it is safe, environmentally friendly and releases no hazardous solvents or strong odour during application.. As Roofdex HB is cold applied, requiring no torches, burners or other heating equipment during application, it poses no fire risks. Beton’s CONIROOF system can meet these requirements. New studies and discussions are taking place to consider including the effects of wall bending and rotation of the walls acting together as a unit, as will be discussed in Part 2 of this article. <> Semi-balloon framing can be used to reduce vertical shrinkage. The St. Teresa’s of Calcutta affordable housing project topped out on the corner of 14th & Commercial in downtown San Diego this month. Unless a diaphragm can be idealized as either flexible or rigid in accordance with Sections 12.3.1.1, 12.3.1.2 or 12.3.1.3, the structural analysis shall explicitly include consideration of the stiffness of the diaphragm (i.e. <> However, knowing that this allowance is provided in the 2015 edition often eliminates the AHJ’s concerns. Comments posted to STRUCTURE website do not constitute endorsement by NCSEA, CASE, SEI, C3 Ink, or the Editorial Board. American Forest and Paper Association (AF & PA). gypsum wallboard) having a response modification coefficient of R=2 would require the WSP walls to be designed for forces in excess of three times greater (6.5/2) than if only WSP walls are used. In 1999, the Structural Engineers Association of California Code and Seismology Committees recommended that relative flexibility requirements outlined in ASCE 7 Section 12.3.1 be considered for wood framed diaphragms. endobj For SDPWS Equation 4.3-1, the first term represents the bending deflection resulting from the lateral forces applied at the top of the wall. Questions or comments regarding this website are encouraged: Contact the webmaster. This allows measuring the maximum SFRS height for a wood structural panel-sheathed shear wall system, in SDC D through F of 65 feet, from the top of the podium. <> As overturning forces develop, the bearing plates at the tension boundary members act to resist these forces causing bearing perpendicular-to-grain stresses and crushing at the bearing plate, sole plate, and top plates of the wall. The Polyurea system has been developed over the last 20 years for use in the waterproofing industry for concrete decks, reservoir roofs, bunds, top of basement wall detailing green roofs as well as lorry beds, ships hulls and bridges. How Full Can Concrete Trucks be when Driving on Slabs-on-Grade? On similar past projects we have used CIP concrete for the podium level where deflections due to gravity loads are minimum. endobj Special Design Provisions for Wind and Seismic with Commentary (SDPWS-15). Nationwide, there has been an increase in the demand for multi-story mixed-use and multi-residential structures. This system utilizes top flange joist hangers to support the floor framing off the bearing walls. The upper slab of the concrete podium typically acts as both a fire separation and structural transfer slab for the framing above. <> Sacramento, CA, SEAOC/IBC Structural Design Manual, Volume 2. 10 0 obj Check out our deck … Nationwide, there has been an increase in the demand for multi-story mixed-use and multi-residential structures. Elevated deck plans also include the use of a ledger board in their design. WITH INTENSIVE GREEN ROOFS 4 NOPHADRAIN . 0 INTRODUCTION 1 DESIGN CONSIDERATIONS. Typically, they are exposed to all extremes of the weather. endobj Typically, they are exposed to all extremes of the weather. We will teach you how to determine the code compliant size of your footings based on the soil type and tributary loads. This allows two stories of podium with five stories of wood framing above to meet the 85-foot maximum building height limitation and also meet the 65-foot SFRS height limit. Learn More. This has decreased costs and also contributed to concrete floors' popularity. Regarding sprinkler protection. Combining light-framed shear walls sheathed with other materials (e.g. [ 17 0 R] endstream
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