Mar, 2019 this video demonstrates the tekla tedds rc pile cap design calculation to the eurocode. The pile cap should normally be rigid so as to distribute the forces equally on. Pile caps can be designed using the truss analogy or using the bending theories. Pile cap modeling and design parameters assignment. 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. Instructional materials complementing fema p751, design examples pilepier foundations view of cap with column above and piles below foundation design 29 passive resistance see figure 4. Modeling of pile cap in safe is then ready once you completed the designation of which types of pile cap to use in your foundation design. Pile spacing, edge distance, and pile cap thickness. The above design assumptions and recommendations are considered as guidelines in considering pile cap as your choice of 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. Design of footings and pile caps limiting bearing stress i at.
However, the resistance ofthe pile cap can be as large as the resistance ofthe piles themselves, or even larger. Sachpazis date 100820 chkd by date appd by date rc pile cap design bs8110. As per is 2911 part i sec 3 2010, the pile cap may be designed by assuming. 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. Pile cap design for piles according to aci 31808 spreadsheet. A similar structure to a pile cap is a raft, which is a concrete foundation floor resting directly onto soft soil which may be liable to subsidence.
Crsi pile cap design guide general discussion structural. Pile cap design allows you to interactively design the pile caps by integrating directly with the 3d structural model. Instructional materials complementing fema p751, design examples pile pier foundations view of cap with column above and piles below foundation design 29 passive resistance see figure 4. Type the distance from the bottom of the pile cap to the top of the piles cp, in the selected units. Design of pile in pile foundation part 12 limit state method duration. Pile under pile cap should be layout symmetrically in both directions. The pile cap design, shape, and dimensions are discussed here. It relies on the strut and tie method to determine the amount of reinforcement required in the pilecap. Equations derived considering the strut and tie model are available to calculate the area of. In this post, we are going to design the same triangular pile cap using bending theory and finite element analysis from staad pro. A pile cap is the mat that rests on groups of piles and forms part of the foundation. Pile cap can be designed using o ne of the following methods. Several commercially available programs were used to perform the calculations described in this chapter. The crack width and the stress tensors are shown here at the full load to provide insight in the behavior results at 1.
There is a scarcity of published information available in the subject area of pile cap lateral resistance. Design and give co mplete reinforce ment detailing for a p ile cap, k nowing that column dimension 0. Since the perimeter of the pile cap is less than 2u, normal shear extending across the full width of the pile cap is more critical than punching shear. Design guide for pile caps timothy mays 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. A casingtube with a conical auger tip attached to its end is rotated clockwise and pushed down into the soil 0. The guide offers several practical pile cap design examples including complete manual solutions for vertical and lateral load situations as well as complimentary access to. This video demonstrates the tekla tedds rc pile cap design calculation to the eurocode. Bored pile and pile cap design free download as powerpoint presentation. Thus, designs are based on the procedure for slender footings that can be divided into three separate steps.
Different methods of designing pile caps are in practice. One of the main part in the design process is autocad as it is used to draw the first assumption of the required piles beneath each column and wall. Kindly bear in mind that at the end of the day, it is always the structural engineers decision and judgment will still follow depending on your guts and prerogative, but at least the above basic knowledge can help you dig in and explore pile. Tabulated designs are also provided for all aforementioned pile cap configurations and a wide range of vertical loading, lateral loading, and overturning effects. I would prefer a program that uses a fem solution to determine the pile cap forces, pile reactions, design the reinforcement, etc. Piles are long and slender members which transfer the load to deeper soil or. Will depend on the load and moments at the base of the columns. A pile cap is a thick concrete mat that rests on concrete or timber piles that have been driven into the soft or unstable soil to provide a suitable and stable foundation. The most common shapes of pile caps are shown in figure below. Design methods aci building code the aci building code aci318 does not contain any provisions specifically for deep pile caps. Second step oneway shear strength of pile cap the critical section is located at 2. Practical design to eurocode 2 the webinar will start at 12.
Pile cap design software pile cap design software dengebre structural op 12 mar 15 20. Reinforcement design of a pile cap 4045 we show the results of the crack width fig. Mostly, up to the four numbers of piles are connected by a pile cap to support the concentrated load from the superstructure, truss theory is used to design the pile caps. Type the minimum thickness used in design, in the selected units. Pile supported foundation pile cap analysis and design. Design examples there are five readytouse example files to familiarize you with this software including examples of tension, compression, tieback, soil screw, and end bearing and friction applications. Foundation analysis and design 53 journal of geotechnical and geoenvironmental engineering, asce, vol. The calculation checks the design of pile caps supporting a. Thermal cracking of concrete pile caps editora dunas placement in layers of small. The cast concrete pile cap distributes the load of the building into the piles. Design the pile cap shown in the following figure with 12 in. Tower designchapter 2pile caps design linkedin slideshare.
Utilizing these concrete stress limits, strutandtie models can be used for both flexural design and shear design of deep pile caps. The design progress report is displayed in the output pane. I am looking for a good pilecap design program and was wondering if anyone had any recommendations. Pdf introduction a pile cap is a thick concrete slab supporting loads from pier or column with upward reactions from piles. The contains comprehensive technical content and practical design examples utilizing approximately 30 different, yet commonly used, pile cap configurations. Reinforced pile cap design, in accordance with bs8110. This article is intended to offer a brief introduction to the new crsidfi concrete reinforcing steel institutedeep foundations institute pile cap design guide referred to henceforth as the guide. It should be noted that the resistance factors with special consideration of pile setup are for 7day retap. Jul 20, 2018 the above design assumptions and recommendations are considered as guidelines in considering pile cap as your choice of foundation.
Download to your hard drive simply by clicking on each one. Substructure design chapter 7 wsdot bridge design manual m 2350. This design example demonstrates how to estimate the nominal driving resistance. The shape and plan dimensions of the pile cap depends on the number of piles in the group and the spacing between each pile. This design example is basically the same as track 1, example 1, with additional construction control involving pile retaps or restrikes at 3 days after eod. Pile cap design procedures for vertical and lateraloverturning loads, respectively, are considered, along with a special chapter devoted to seismic design of pile caps.
Kindly bear in mind that at the end of the day, it is always the structural engineers decision and judgment will still follow depending on your guts and prerogative, but at least the above basic knowledge can help you dig in and explore pile cap designing. Pile foundations are the part of a structure used to carry and transfer the load of the structure to the bearing ground located at some depth below ground surface. If the spacing is less than 3 times of diameter, pile group settlement and bearing capacity should be checked. The main components of the foundation are the pile cap and the piles. Reinforced concrete design design of pile cap general pile layout pattern. This includes the aci building code with and without the recent.
May 31, 2019 pile cap design for piles according to aci 31808 spreadsheet. Dec 06, 2019 pile caps can be designed using the truss analogy or using the bending theories. 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. The pile cap has normalweight concrete with a compressive strength of 4000 psi and grade 60 reinforcement. Used in conjunction with building design suite, masterkey. In general, piles should be spacing at 3 times of pile diameter in order to transfer load effectively to soil. Comparative design of triangular pile cap with free pdf. The contribution of the column load to the shear force may be reduced by applying a factor. 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 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. Mod11 lec47 emprical relationship between spt and several soil. See chapter 2 for examples of pile design data sheets that shall be filled out and submitted to the geotechnical engineer at the early stage of design. The calculation checks the design of pile caps supporting a single column with up to 9 piles. How to design pile cap for group of piles in foundation.
Pile cap design provides advanced analysis, design, detailing and scheduling of pile caps, with up to 9 piles supporting circular or rectangular columns. There is a need for improved understanding ofthe factors that control the magnitude ofcap resistance, and for rational design procedures to include cap resistance in the design ofpile groups to resist lateral loads. Type the depth from the soil surface to the top of the pile cap, in the selected units. Pile cap design software structural engineering general. In our post on structural aspects of pile foundation design, we showed how we can determine the number piles required to support a column load, in which we went ahead to design a triangular pile cap based on strut and tie method truss analogy. How to design pile caps in safe the structural world. 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.
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