It can also refer to plastic or glass fiber caps placed over the tops of wooden pilings to protect them against rot and to stop birds nesting on the pilings. The first part of the result outcome is the detail drawing of the pile cap with include the dimension of pile cap, number of main reinforcement needed for the pile cap including the bar spacing and spacing between the piles. The pile cap has normalweight concrete with a compressive strength of 4000 psi and grade 60 reinforcement. It should be noted seismic performance of piletopile cap connections. Design the pile cap shown in the following figure with 12 in. This software is not a part of the ses or utility library bundle. This software will aid structural engineers both at design and construction stage.
Figure 1 shows the formation of typical potential plastichinges. Behavior of pile caps on one steel pile medcraveonline. Pile cap forces maximum compression within pile cap. The users can view deformed shape of pile group once the analysis is successfully completed. The as driven centroid of load of any pile group at cutoff elevation shall be within 5% of the plan location of the designed centroid of load. Download pile cap designing excel excelsheet for pile cap. Incorporation of setup into driving resistance estimation for cohesive soils. The cast concrete pile cap distributes the load of the building into the piles. Apr 18, 2017 safe 2014mat foundation designpart 1, engahmad alawwad duration.
Grade of concrete m 30 grade of steel fe 500 size of column 680 x 300 mm axial force 1560 kn moment mx 339 knm moment mz 0. How to design pile cap for group of piles in foundation. There is a scarcity of published information available in the subject area of pile cap lateral resistance. The second part of this project will determine whether the same design of pile cap for normal pile cap can be used when eccentricity occurs. The webinars contain comprehensive technical content and practical design examples.
Factor steel hpile timber pile prestressed concrete pile concretefilled pipe pile structural load factors. The pile cap design, shape, and dimensions are discussed here. This presentation provides an overview of the new crsi pile cap design guide the guide has been developed as a standalone publication intended to provide the practicing engineer with a detailed overview of pile cap design, detailing, and analysis methodologies that represent the current state of practice in the industry and meet the latest. Pile cap design spreadsheet jobs, employment freelancer. Pile spacing, edge distance, and pile cap thickness. A reinforced concrete slab or block which interconnects a group of piles and acts as a medium to transmit the load from wall or column to the piles is called a pile cap. A pile cap is the mat that rests on groups of piles and forms part of the foundation. The main components of the foundation are the pile cap and the piles. Safe 2014mat foundation designpart 1, engahmad alawwad duration. The pile cap was modelled as a 0 mm thick concrete plate element on staad pro, while the piles were modelled as 600 mm diameter columns with a length of 2m supported on a fixed base.
The process of constructing the bridge can be divided into 2 parts, those are. It should be noted seismic performance of pile to pile cap connections. Pile group analysis and pile cap design product overview. Top of pile to be 12 above the soil surface soil data. In general, piles should be spacing at 3 times of pile diameter in order to transfer load effectively to.
Design of pile cap free download as powerpoint presentation. In general, piles should be spacing at 3 times of pile diameter in order to transfer load effectively to soil. Pile cap project phase iii final report western transportation. The pile cap should normally be rigid so as to distribute the forces equally on. It can also refer to plastic or glass fiber caps placed over the. Piles are slender linear structural elements, whose purpose is to transfer the load from the superstructure to the soil. Introduction a pile cap figure 1 is a stocky reinforced structure which spreads and distributes the load from a column or bridge pier downwards into supporting piles. The short column was adopted to avoid wide variation of result due to second order effects and to avoid large displacement which is not practicable and also not. Department of civil and environmental engineering master of science pile groups are often used to provide support for structures. Comparisons with results from 48 pile cap tests demonstrate that the oneway shear design provisions of the present aci building code are excessively conservative for deep pile caps, and that the traditional flexural design procedures for beams and twoway slabs are unconservative for pile caps.
It usually forms part of the foundation of a building, typically a multistory building, structure or support base for heavy equipment. In general it is designed like a footing on soil but with the difference that instead of uniform reaction from the soil, the reactions in this case are concentrated either point loads or distributed. The experimental test to show that the two pile caps with conformation rough of the column and walls of the socket, support more load in. It generally develops part of the foundation of a building, specifically a multistory building, structure or support base for heavy equipment. Embedment of pile into pile cap diameter or width of pile ultimate anchorage bond stress characteristic yield strength of reinforcement design ultimate bond stress characteristic cube strength of concrete at 28 days ultimate force in a bar or a group of bars tie force kn design ultimate horizontal load on pile. Note that development of a plastic hinge at the piletopile cap interface does not typically result in failure of the structure. When a pile cap is designed by truss analogy, 80% of the tension reinforcement is concentrated in the region where the cap is supported on piles and at the column, which depends on design moments. The pile head at cutoff elevation shall be within 50 mm of plan locations for bent caps supported by piles, and shall be within 150mm of plan locations for all piles capped below final grade. Appendix b columnto pile cap connections appendix c pile to pile cap connections this design guide has been developed to provide the practicing engineer with a detailed overview of pile cap design, detailing, and analysis methodologies that represent the current state of practice in the industry. 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.
Finite element analysis of pilesoilcap interaction under. Tgpiles allows the user to analyze any pile arrangement for the applied loads dead, live, and wind and design the pile cap accordingly. Analyze any pile arrangement and design the pile cap accordingly, including cap thickness, steel requirements, and rebar spacing. Comparisons with results from 48 pile cap tests demonstrate that the oneway shear design provisions of the present aci building code are excessively conservative for deep pile caps, and that the traditional flexural design procedures for beams and. Depending upon type of soil, pile material and load transmitting characteristic piles are classified accordingly. Design guide for pile caps crsi resource materials.
These webinars presented by the author of the crsis design guide for pile caps providing the practicing engineer with a detailed overview of pile cap design, detailing, and analysis methodologies that represent the current state of practice in the industry. Oct 04, 2014 the term pile cap may be used to describe a reinforced concrete slab constructed on top of a group of foundation piles to evenly displace or spread the load they are to carry. Behavior of model steel hpiletopilecap connections article in journal of constructional steel research 80. If the spacing is less than 3 times of diameter, pile group settlement and bearing capacity should be checked. Design of pile cap as per is 2911 part i sec 3 2010, the pile cap may be designed by assuming that the load from column is dispersed at 45 from the top of the cap up to the mid depth of the pile cap from the base of the column or pedestal.
Thermal cracking of concrete pile caps editora dunas placement in layers of small height, precooling and postcooling of concrete comptia network n10 005 pdf download filetype pdf. The forces acting on the pile caps are obtained in the same way as for footings, as is the pile cap design. In the following chapter we learn about, classifications, functions and pros and cons of piles. Piles are used to carry the load of the structure deep into the ground, and pile caps form the solid foundation on which the piers are then built. Piles may also be used where the soil is particularly affected by seasonal changes, to transfer the load below the level of such influence. Capping a pile group further adds to the systems resistance due to the passive earth pressure from surrounding backfill. Pile caps are tridimensional structural elements whose function is to transfer the forces in the column to a set of piles. Behavior of model steel hpiletopilecap connections. A pile cap is a thick concrete mat that rests on concrete or timber piles that have been driven into soft or unstable ground to provide a suitable stable foundation. In this tutorial it is explained how to use nonlinear finite element analysis nlfea to determine the reinforcement design for a pile cap which complies with the. Parametric analysis on bridge reinforced concrete elevated pile. Aug 18, 2015 design of pile cap as per is 2911 part i sec 3 2010, the pile cap may be designed by assuming that the load from column is dispersed at 45 from the top of the cap up to the mid depth of the pile cap from the base of the column or pedestal. Finite element analysis of pilesoilcap interaction under lateral load 811 table 2.
Due to the presence of the forms on the sides and bottom of the pile cap, which being made of wood provide thermal insulation, the primary heat flow occurs toward the top of the pile cap. The second part of this project will determine whether the. The term pile cap may be used to describe a reinforced concrete slab constructed on top of a group of foundation piles to evenly displace or spread the load they are to carry. Any configuration of up to 200 piles may be analyzed for both axial and biaxial bending moments. Determination of generalized soil category based on the ratio of pile penetration in cohesive and noncohesive layers. Download limit exceeded you have exceeded your daily download allowance. The shape and plan dimensions of the pile cap depends on the number of piles in the group and the spacing between each pile. More information on how the pile caps are designed can be found in the footing analysis and design section of the footing analysis and design page. In this paper, data was collected from 21 pipe pile projects constructed in ohio khan, 2011. Comparative design of triangular pile cap with free pdf.
Extensive displaying options such as model contour, pile and pile cap color, local and global axes, shape scaling factor and pile numbering are available in pilegroup for the users to personalize the 3d graphical presentation. Design of deep pile caps by strutandtie models scielo. Length from midplate to pile tip recall that the helical plates are spaced at three times the diameter of the nearest lower plate. Design and reanalysis of pile cap with five piles under. Note that development of a plastic hinge at the pile to pile cap interface does not typically result in failure of the structure. When a pile cap is designed by truss analogy, 80% of the tension reinforcement is concentrated in the region where the cap is supported on piles and at. Practical design to eurocode 2 the webinar will start at 12. Discussion on pile retap 24 hours after eod for piles with driving resistance at eod less than the required nominal driving resistance. A pile cap stands for a compact concrete material that is supported with concrete or timber piles driven into soft or unsettled ground to build up a perfect durable foundation. Potential inelastic damage has occurred at the interface between pile heads and pile cap as evidenced in recent earthquakes. Oct 05, 2016 construction of pile cap a what is pile cap. The column or wall on pile cap should be centered at the geometric center of the pile cap in order to transferred load evenly to each pile.
Excel spreadsheet pile cap design bs8110 example jobs. Pile cap design calculation civil engineering community. Data included the number of piles, restrike time, pile length, pile diameter, initial total capacity. Substructure pile foundation, pile cap, pier, pier cap 2. Introduction to pile cap design part 1 register here these webinars presented by the author of the crsis design guide for pile caps providing the practicing engineer with a detailed overview of pile cap design, detailing, and analysis methodologies that represent the current state of practice in the industry. Design and reanalysis of pile cap under eccentricity. Passive earth pressures on a pile cap with a dense sand. Structure of the guide introduction to pile foundations pile foundation design load on piles. The pile cap should normally be rigid so as to distribute the forces equally on the piles of a group. Appendix b columntopile cap connections appendix c piletopile cap connections this design guide has been developed to provide the practicing engineer with a detailed overview of pile cap design, detailing, and analysis methodologies that. Pile supported foundation pile cap analysis and design.
The second part is testing the design under eccentric load and obtaining the maximum eccentricity to be supported by the pile group without failure. The works to the rear elevation of the main property will be completed with a new reinforced concrete liner wall, 150mm thick, to be cast to internal face of piled retaining wall and capping beam. It generally develops part of the foundation of a building, specifically a multistory building, structure or. A pile cap is defined as a concrete block cast on the head of a group of piles, to transmit the load from the structure to the group of piles. Combined rectangular pilecap design excel sheet engineering. Generally, pile cap transfers the load form the structures to a pile group, then the load further transfers to firm soil. Cap 60,000 lb orking l ad,000 lb 12 water table 14 ft. Passive earth pressures on a pile cap with a dense sand backfill. The most common shapes of pile caps are shown in figure below.
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