Design of slab examples and tutorials by sharifah maszura syed mohsin example 2. Make the slabs square or rectangular, with an aspect ratio not to exceed 1. Design and construction of pile supported concrete industrial floors piled floors in distribution centres are attracting unfavourable attention among developers and building owners and there is some nervousness about the commonly used steelfibrereinforced concrete sfrc designs. Design examples pile pier foundations view of cap with column above and piles below foundation design 29. Slabs are generally designed on the assumption that they consists of a number of beams of breadth one meter. The design follows the regulations in bkr 4 and bbk 5. Most codes provide little direct design guidance for pile extension connection. Pile grids are normally in the range 3 x 3m to 5 x 5m, depending on the pile capacities and the intensity of loading. Intermediate, geopierreinforced mat slab versus deep. Manual for design of slabs, pile caps and footings. They may be supported on two opposite sides only fig. The method has proved to compete and give trustworthy designs in the construction of pile supported suspended slabs used in several realized projects, see table 1.
Visualfoundation structural analysis and design software. It is assumed that the ground gives no support but simply acts as in situ formwork for the floor slab. Aci 360, guide to design of slabs onground describes these floors as slabs. Request pdf design of steelfibrereinforced pilesupported slabs concrete society technical report 631 provides general design guidance for steelfibrereinforced concrete sfrc, which is. Pile supported slabs are quite common in areas where soilstructure interaction may create differential settlement or long term tolerance problems. These slabs are designed assuming no structural support from the ground, the ground only acting as insitu formwork. Design the pile cap shown in the following figure with 12 in. Design mat on pile foundation in safematraft design course duration. This report presents the results of a study to assess the. Aci 318 is not applicable to posttensioned slab onground residential foundations. Element analysis fea and design results of the engineering software program spmats.
The design process for the now withdrawn bs8110 design standard works slightly differently to that used in the new ec2 bs en 199211. The support system has completely changed from the slab onground to a pile supported system. Force on a pile eq on unloaded pile pile supporting structure. The structural slab is designed without any ground support.
During the design process, it is very important to assign a proper value of. Different types of loads on pile foundations and their. Oneway and twoway slabs oneway slabs transfer the imposed loads in one direction only. Installing piles can be very expensive and the design process is very complex and time. Use it as you see fit, but please note that there is no technical support available to answer any questions about. Pile supported foundation pile cap analysis and design. Designing pile supported mat foundations in staad foundation. Geosynthetic reinforced pile supported embankments by rutugandha gangakhedkar may 2004 chair. Pdf introduction a pile cap is a thick concrete slab supporting loads from pier or column with upward reactions from piles. The slab is supported on beams of size 225 x 500 mm spaced at 4. Floors and screeds design and construction of pile supported.
A monolithic or thickenededge slab is a ground supported slab on grade with an integral footing i. Sites can sometimes need slabs to be pile supported as well as those situated on poor ground where settlement or loading criteria are particularly sensitive issues. Here at konfloor we can design and construct these floors to the latest design methods using steel fibre reinforcement. Nov 24, 2016 details language english duration 15 mins format. Slab design reading assignment chapter 9 of text and, chapter of aci31802 introduction aci318 code provides two design procedures for slab systems. Download free demo updated august 8, 2019 soilstructure slab on grade software simplifies the calculation of a.
The design is the same as for suspended floors, using the approaches in bs 8110, now withdrawn and superceded by eurocode 2. Pile supported slab on ground concrete engineering general. Reinforced concrete design 1 design of slab examples and. Design of piers pedestals structural design of piles wood, concrete or steel gradebeam checks and reinforcement. New design of suspended pile supported sfrc slabs arch action in. The piles support the elevated structure by remaining solidly placed in the soil.
Design acceleration the elastic design response spectrum used in the analyses is consistent with that recommended by atc40 1996. Design and analysis of retaining walls 3 f crib walls or coffer dams are cells or units to be filled with soil or builtup members of pieces of precast concrete or metal and are supported by anchor pieces embedded in the soil for stability. Over the past decades, there has been an increasing recognition of the strategic use of pilesupported rafts in design of heavilyloaded structures to reduce total and differential settlements. A pile supported structural slab figure 1c alone can cost as much or more than the excavation and. Because pile foundations are set deeply, they are inherently more tolerant to erosion and scour. On the expansion side, the soil subgrade modulus is 100 kcf because the contractor could not match the soil properties under the existing foundation slab, which is 200 kcf. Structural design considerations for uniformlyloaded floor slabs. Design and construction of pilesupported concrete industrial floors piled floors in distribution centres are attracting unfavourable attention among developers and building owners and there is some nervousness about the commonly used steelfibrereinforced concrete sfrc designs. Structure of the guide introduction to pile foundations pile foundation design load on piles. Pile supported foundation pile cap analysis and design based on a geotechnical study, a pile supported foundation is required to support a heavily loaded building column.
Lateral load analysis of waterfront structures supported on. Based on a geotechnical study, a pile supported foundation is. Pdf influence of the pile stiffness on the ground slab behaviour. Pile foundation is the most common type of deep foundation used to transmit structural loads, namely axial load and lateral load into the deeper layers of firm soil.
Pile cap design concrete design structural engineering. Floors and screeds design and construction of pile. There are several issues related to bearing capacity failures. Hello everyone, i am working on a project where we have this large pile supported slab 200 x 300 with a design load of 400psf heavy racking. The effective span of a simply supported slab shall be taken as the lesser of the following. Pdf comparison of moments for pilecap design researchgate. Pdf load transfer mechanisms in pilesupported earth platform. Jointed floors with steel fibers in these floors, closelyspaced sawcut joints form the main defense against random cracks. Foundation analysis and desing foundation design 1.
Pile partially fabricreinforced slab top and bottom combined moment and shear reinforcement pile head. Where pilesupported slabs are used, the subbase is assumed to recede in the longterm, leaving the slab supported solely by the piles. This is a similar effect to what is required in elevated slab supported. Due to lack of corresponding design code, based on the analysis of its structure characteristics and application requirements, it is proposed to carry out load effect combination according to ultimate limit state and serviceability limit state, and the most unfavorable combination of each state is. Download code designing pile supported mat foundations in staad. Over the past decades, there has been an increasing recognition of the strategic use of pile supported rafts in design of heavilyloaded structures to reduce total and differential settlements. Successful pile foundation following hurricane katrina dauphin island, alabama. Pdf four fullscale test sections were constructed in order to analyse the load. Pile slab structure roadbed is a new form of ballastless track for high speed railway.
Continuous one way slab figure 1 shows a clear area of 12 m x 8. The use of automatic construction is often in favour of manual. May 06, 2017 some of the observations made during extraction of results from etabs v 9. It is required to understand the types of loads on piles and their transfer mechanism in order to select and design a suitable type of pile. Install a polyethylene slipsheet directly beneath the slabs. Given the soft and compressible marine clays in the boston area, driven pile foundations were selected to support specific structures, including retaining walls, abutments, roadway slabs, transition structures, and ramps. Their support and expertise is critical to this project and is greatly appreciated. Initially, weak clay has to support a slab and distribute the load. Pile and grade beam foundations should be considered in these conditions, particularly when the blow count is five. Eight large to fullscale columnslab bridge connection will be tested in this study. Instructional materials complementing fema p751, design examples foundation design 3. Oneway and twoway slabs university of asia pacific. Where pile supported slabs are used, the subbase is assumed to recede in the longterm, leaving the slab supported solely by the piles. Pile supported floors konfloor the industrial flooring.
Divide the floor into slabs no more than 110 ft by 110 ft. Hurricane katrina in the gulf coast fema 549 figure 23. Pdf just as other structural elements, ground slabs are an important unit of a building. Pile supported slabs are considered as deep foundations and are introduced after geotechnical investigations have determined that the ground is inadequate for a ground supported slab. Oneway and twoway slabs oneway slabs transfer the imposed. Furthermore, the yielding moment computed for the pile was 750 knm, whereas that for the pile to pile cap connection was 510 knm. The slab will pile supported slab on ground concrete engineering general discussion engtips. The bulk of the added costs come as a result of the mat slab pour. Many industrial ground floors are constructed as pile supported slabs due to high floor loadings andor poor ground conditions. This student guide is intended as just that a guide for students of civil engineering. Struts provide some lateral support for the pile, but very little resistance to rotation.
An existing lshaped foundation slab supported by soil 1 will undergo expansion supported by soil 2. Distance between the centers of bearings, clear span plus effective depth. Oct 04, 2017 commentsobservations regarding modelling in etabs doc no. Civil and coastal engineering the design of embankments on weak foundation soils is a challenge to the geotechnical engineer. Design of steelfibrereinforced pilesupported slabs. Load transfer mechanisms in pilesupported earth platform under slab foundation. Determine slab thickness and concrete strength as if the slab were unreinforced. Manual for design and detailing of reinforced concrete to the code.
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