The cutting edge american house, with its intertwined spaces, utilitarian zones and cubic structures, was created in europe by le corbusier and others, adjusted in america by the works of the masters, and changed into another figure of speech thro. The following example illustrates the design methods presented in aci 31805 and ibc 2003. Podium deck waterprooing assemblies present signiicant design and liability challenges to building owners and designers. Fivestory woodframe structure over podium slab pages 1 50. In contemporary practice, landscape design bridges the space along with landscape architecture and garden design. I am designing a posttensioned podium slab concrete slab with 4story wood construction ontop.
What is podium slab, its functions, advantages and disadvantages. Woodframed building over podium slab in risa youtube. Sometimes when the ground level starts from podium level the driveways need to be designed for the fire tender load if the buildings need to be serviced from the podium level. Examine relevant building code provisions applicable to multistory podium structures, including considerations for fire and life safety design. These slabs offer high fire ratings, reduced sound transmission, as well as reduced vibrations between living areas. Then, in chapter 3 a wide range of posttensioning applications are illustrated, including foundations, structural walls and service cores. Design considerations for renewing podium waterproofing. Everything you need to know about building with concrete. Simplified design checks of buildings with a transfer structure in regions of lower seismicity mehair yacoubian1, nelson lam2, elisa lumantarna3 and john l. Department of energy buildings for the 21st century buildings that are more energyefficient, comfortable, and affordablethats the goal of does office of building. Because our precast podium slabs are erected faster, were able to reduce onsite construction time. Prepared for the pci hollow core slab producers committee john e. This design example illustrates the seismic and wind design of a hotel that includes five stories of woodframe construction over a onestory concrete podium slab and is assigned to seismic design category d. Way flat slab with no drops typical loading, several spans and member size combinations book extract of design tables design parameters slab layout.
Podium structures have become common in the united states as the demand has increased for dense, mixed use spaces and multiunit residences. Podium slabs are mostly designed as flat slabs or a combination of flat slabs or grids or pt slabs etc based on the design requirements of the architects. This should help the reader to rationally select an efficient overall structural concept for a building. Cover photocollector spread into slab adjacent to shear wall. Posttensioning in buildings is not limited to floor slabs.
Saccoman, chairperson james beerbower ernest markle kevin boyle james markle jeffrey butler milo j. Moreover, a concrete podium slab has no restrictions to support loadbearing walls from the structure above. When designing a typical non podium slab, i typically design the pt system to balance about 50 80% of the dead load of the slab s self weight. For 1m slab width, moment, shear force, oneway continuous slab for continuous slab, moment and shear force can be obtained from table 3. The expsed regions require special treatment, both in regards to th e value of design loads from. Also, it is not advisable to use equation 1 for designing transfer members, including podium slabs. Hence, the thermal gradient loads applied refer to the differences between the top and bottom surface temperatures. Jurgens his article presents a set of guidelines intended to t assist designers in routine posttensioning design, beginning with a discussion of the initial decisions that must be made to design posttensioned floor members.
This article covers important design considerations and traditional approaches related to the design of a fivestory woodframed structure over a twostory concrete or masonry podium. Guidelines for the design of posttensioned floors by bijan o. Sep 03, 2011 reinforced concrete sk 33 section through slab showing stress due to moment. Large fans positioned around the test specimens were effec tive in keeping the bottom surfaces at close to room tem perature. Usually these slabs are situated above parking levels and as such require higher fire ratings and reduced sound transmission. Her expertise lies in midrise wood frame over concrete podium structures. In order to gain an additional story for multilevel woodframed buildings, architects and engineers are increasingly turning to podium or pedestal design rather than building directly on a concrete slab on grade. Countless millions of square feet of 8 hollowcore slabs have been the goto choice for floor and roof construction in hotels, apartments, schools, prisons, and a multitude of commercial buildings for over fifty years. Modeling podium slabs ram staad opentower wiki ram. Manual for the design of hollow core slabs second edition by donald r. Although coldformed steel framing for floor systems also is permitted by the irc, it is not covered here. She has been involved in the design of eight different podium type structures throughout the bay area and has seen many of those through construction.
Practical, code compliant detailing for midrise wood. Some recent problems in applying aci 318 deflection criteria by ken bondy aci fall convention. Structural design and construction of council on tall. For conventionally reinforced flat slab construction with span to depth ratio of 30. Greater design flexibility a concrete podium slab allows the designer the freedom to use a completely different floor plan between the above and below levels. 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. Podium or structural slab filter mesh podium or structural slab filter mesh a1 body a1c1pod podium drain clamp ring to receive 34 drainboard. Post tension slab is a combination of conventional slab reinforcement and additional protruding highstrength steel tendons, which are consequently subjected to tension after the concrete has set. Apr 17, 2017 the cutting edge american house, with its intertwined spaces, utilitarian zones and cubic structures, was created in europe by le corbusier and others, adjusted in america by the works of the masters, and changed into another figure of speech thro. Figure 3 podium slab with tensioning cables and reinforcing steel. Design is defined as the decisionmaking process of planning, sizing, detailing, and developing specifications preceding construction of slabsonground. The reaction at the foundation support would not be transferred to the podium slab. To prevent this from occurring it is best to snap slab edge segments directly to walls ends near the slab boundary. Lrfd for concrete design hold down attachments to concrete options.
Developers, architects, engineers, contractors, educators and. A combination of these values will determine the slab stresses at the time of stressing and at service loads. Discuss the advantages of podium construction and the unique design benefits of using timber as a primary building material. The support arrangement below the podium slab is mostly configured for parking or retail. Design of woodoverconcrete podium structures youtube. Posttensioning of foundations, transfer beams and plates, posttensioned masonry and the combination of precast elements with castinplace concrete by means of posttensioning offer other interesting opportunities. Podium designs are one way to maximize the number of stories, increase unit density, and lower construction costs. Podium drain solutions f1100cpvpaver paver podium system f1100cbp below paver podium system mifab strainer top 4 ips strainer clamp 34 high drainboard waterproofing membrane a1c1pod podium drain clamp ring to receive 34 drainboard a1 body podium or structural slab filter mesh podium or structural slab filter. This design example illustrates the seismic design of a four story wood framed hotel over one story of concrete podium slab which is assigned to seismic design category d. What is podium slab, its functions, advantages and. Solutions for transferpodium slabs prestressed hollowcore floor members offer a distinct advantage over other traditional slab materials for the following reasons. Single family podium construction precast solutions.
Post tension slab working principle, components and. At esr, we have the knowledge and expertise to design and replace existing failing waterproofing systems. Anchor reinforcement for concrete podium slabs simpson. As the basement slab be used to prop the basement walls, no movement joint be allowed in the basement. One of the fastest growing segments of multifamily housing today is the use of podium structures. Unless otherwise noted, all referenced table, figure, and equation numbers are from these books. Posttensioned podium slab structural engineering general. 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. Seismic design of castinplace concrete diaphragms chords, and collectors. Structural design and construction of hyundaihyperion project, seoul, korea kwangryang chung1, inki kim2, myeonghan kim3. Key changes in the 2019 edition of the aci building code.
Reinforced concrete slabs subjected to thermal loads f. Improve comfort and save energy in homes with slabongrade floors office of building technology, state and community programs energy efficiency and renewable energy u. Improve comfort and save energy in homes with slabongrade. Some recent problems in applying aci 318 code deflection. Find the following parameters for design moments in step 2 per unit width step 4 note. A guide for practicing engineers, second edition, gcr 1691742, nehrp seismic design technical brief no.
A summary of important design considerations for this type of system. Typically, these are comprised of ground level parking with 34 levels of conventional residential construction above, deriving their name from the podium that separates the two occupancies. As can be seen in the example above, equation 1 is one of the most useful tools at the disposal of engineer designing posttensioned concrete. As part of a buildings exterior element, landscaped podiums or waterproofed plaza. Aalami a must have reference book for engineers, students, contractors, building officials, and researchers. Part 1 overviewthis design example illustrates the seismic and wind design of a hotel that includes five stories of woodframeconstruction over a onestory concrete podium slab and is assigned to seismic design category d. The gravity load framing system consists of woodframe bearing walls for the upper stories and concrete bearing walls for the lower story. Design considerations for renewing podium waterproofing the l andsc aped podium. This hollowcore level can act as a podium slab, where loading from the wood frame construction above can be transferred directly into the foundation walls. This pdf file contains a chapter of 23 pages with various aspects of flat slabs including four example of flat slab design.
In many instances, the podium sl abs feature exposed areas for access or landscacping. Thin slab floor systems for high rise towers by steven m. Building floor planbuilding floor plan fl a 12 000 ft floor area 12,000 sq. Your slab design may require more flexural bars or they may already be there to meet other slab design requirements.
Design of slab for flexure 067 m unit width of slab. Oneway simply supported slab analysis and design of the slab similar to design of simply supported beam as indicate in the previous chapter. When designing a typical non podium slab, i typically design the pt system to balance about 50 80% of the dead load of the slabs self weight. Shear wall to podium slab interface amplification of seismic forces. This webinar will demonstrate how to build a multiple story wood framed building on top of a concrete podium slab using risafloor es to design. Because our precast podium slabs are erected faster, were able to reduce onsite construction time and deliver greater return on investment, all year round. The gravity load framing system consists of woodframe bearing walls for the upper stories and concrete bearing walls for. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. This problem most often occurs at walls that are skewed to the global x or y axes and the slab edge segment is modeled continuous past the wall end. Flat slab analysis, design and detailing pdf civil engineering. One of the fastest growing segments of multifamily housing today is the use of podium.
Simplified design checks of buildings with a transfer. Podium slabs precast podium slabs with designbuild engineering support early in the project save time and money. We use topoftheline urethane waterproofing materials to waterproof slabs and then restore all finishes back to their original conditions. New landscape design plans architecture cities ideas landscape design is an independent profession and a design and art tradition, practised by landscape designers, combining nature and culture. The arrangemnet of the walls and columns above the podium slab is generally selected to suit the occupancy above the podium mostly residential or off ice occupancy. As the residential tower drops down to its podium at the pool and recreation deck level, discontinuing the expressed. This hybridisation helps achieve the formation of a much thinner slab with a longer span devoid of any columnfree spaces. A 2 2area 2 a c 2 2 posttensioned concrete design table 11 list of symbols used in the aci 31808 code cp area enclosed by the outside perimeter of the section, in a g gross area of concrete, in. A 2 2area 2 a c 2 2 posttensioned concrete design table 11 list of symbols used in the aci 31808 code cp area enclosed by the outside perimeter of the section, in a g gross area of concrete, in a 2 l total area of longitudinal reinforcement to resist torsion, in a o area enclosed by the shear flow path, sqin a oh area enclosed by the centerline of the outermost closed. This necessiatates the design of the podium slab to account for repositioning of the loads from above.
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