Innovative geotechnics is an engineering company with the aim of researching and developing geotechnical design and analysis programs. Foundation analysis and desing foundation design 1. While other programs use simple rigid body principles to determine the distribution of forces to individual piles, pile group analysis does a comprehensive analysis of the pilesoil interaction to determine the distribution. Deeper zone of influence for end bearing shaft group fhwa nhi10016 after tomlinson, 1994. Administrators, engineers, and researchers are faced continually with many highway problems on which much information already exists either in documented form or in terms of undocumented experience and practice.
The program computes deflection, bending moment, shear force and soil response. Efficiency of a pile group can also be obtained by using converse labarre formula. Piles may be located at different elevations and be battered independently. 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. This reference case deals with the analysis of a pile group composed of a.
Civilax on analysis and optimization of prismatic and axisymmetric shell structures. The site lies entirely within an area of reclamation, which is understood. Pile group settlement estimation research to practice. Pile modelling the proposed method was developed to capture the response of a pile group subjected to horizontal load. Example calculations forpile resistance analysis andverifications note. Evaluation of group factor method for analysis of pile groups.
Piles are most effective when combined in groups or clusters. Analysis of vertical bearing capacity of a group of piles in cohesionless soil navfac dm 7. Pdf comparison of four pile group analysis programs. Pilegrp pile group analysis for a rigid pile capmat. It allows the users to zoom, rotate and move the displayed results smoothly in threedimensional space with mouse or keyboard. Dpile group formerly known as mpile enables the analysis of the threedimensional be havior of single piles and pile groups. Design for settlement of pile groups by the unified design. Pdf a brief outline is given of the basis of analysis used in two computer programs, piglet and defpig, for analysis of pile group response. Foundation analysis and design 53 journal of geotechnical and geoenvironmental engineering, asce, vol. Design the pile cap shown in the following figure with 12 in. Pile driving analyzer pda for high strain testing pile. Fixed head pile was assumed, the resulted pile head displacement is 1.
Thus, the pile group efficiency is equal to the ratio of the average load per pile in the group at which the failure occurs to the ultimate load of a comparable single pile. Analyze a group of piles for loads in any direction using the same advanced soilstructure model used in the static pile program. A cap is necessary to spread the vertical and horizontal loads and overturning moments to all the piles in the group. In all the examined cases, a load test on a single pile was also available. A simplified approach for nonlinear analysis of the loaddisplacement response of a single pile and a pile group is presented using the loadtransfer approach. Performancebased design factors for pile foundations. B1 determining the axial pile resistances fromstaticpile loadtests, andultimateand serviceabilitylimit state analyses b1. The pile driving analyzer pda system is the most widely employed system for dynamic load testing and pile driving monitoring in the world. Implementation of aashto lrfd bridge design specification. This paper will compare these methods, provide insights into the proper understanding of nsf effects on pile behaviour and.
Simplified method for settlement prediction of single pile and pile. Among different methods that exist for analysis of soilpile interaction, the py method is the most widely used one in practice because it is easy to. A new method of analysis is presented for singlepiles and pile groups which offers a considerable degree of reliability without having to do either impossibly. Pile driving analyzer systems also evaluate shaft integrity, driving stresses, and hammer energy. Four computer programs clap, piglet, repute and plaxis 3d, have been used for the analysis of pile groups subjected to applied loadings. Diagrammatic geological model adopted from ahmad abdelrazaq et al. The users can view deformed shape of pile group once the analysis is successfully completed. Five methods for calculation of pile group settlement were compared and applied to.
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. Pile spacing effects on lateral pile group behavior. Pile design software pile group analysis py curves. Ultimate vertical load bearing capacity of pile analysis is done by static analysis based on c. The program assumes the pile cap to be rigid and the piles to be. The pile group worksheets assume a minimum of 2 piles and a maximum of either 25, 75, 300, or 400 piles for a pile group. Such an analysis may yield pile group flexibility, stiffness, deflection, and distribution of loads. Single vertical pile was analyzed under a lateral load of 80 kn using relationships developed by reese and matlock. Analysis of pile groups civil engineering community.
This positions the pile in space and later allows the soil, the water table and loads etc. Fm 54 chapter 7 distribution of loadson pile groups section i. Analysis and design of pile groups 28 1 loads acting on the piles, which will be increased for the piles in the leading rows and decreased for those in the trailing rows of the group. Pile group analysis is the most advanced pile group analysis program available. Group is a wellaccepted tool for analyzing the behavior of pile groups subjected to both axial and lateral loadings. Analysis and design of pile groups 29 1 the ratio of load on pile to the average pile load in the group p p av, and is plotted against the normalised pile spacing sd. Pile caps are structural elements that fulfil the function of transmitting the load from superstructure column or a wall to a group of concrete piles. Reliable estimation of pile group settlement was a key issue. This is a spreadsheet program written in msexcel for the purpose of analysis of pile groups with rigid caps using the elastic method. Pile cap may be designed using one of the following methods. Dc pilegroup analysis of pile groups civil engineering. It can compute the axial capacity for driven piles as well as the pile internal forces and displacements under various loads and soil displacements. Project definition pile the elevation of the top of the pile and the total length of the pile must first be defined figure 4.
Simplified analysis of laterally loaded pile groups. Pdf analysis and design of pile groups researchgate. Pile group settlement estimation research to practice h. Specifically, the properties of the pile group are calculated, and then based upon the applied vertical and horizontal loadings, the vertical and horizontal pile reactions are calculated. Annexb example calculations forpile resistance analysis. Lpile is a specialpurpose and internationally recognized computer program based on rational procedures for analyzing a pile under lateral loading using the py method. Instructional materials complementing fema p751, design examples. Consider a group of three piles, each of 600 mm diameter installed in one row. Comparison with field and laboratory tests indicates that the behavior of pile groups predicted by the analysis is in qualitative agreement with observed behavior. The load carried by an individual pile or group of piles in a foundation depends upon. A comparison of the capabilities of each program is presented and then a parametric study is made of a six. Analysis method for laterally loaded pile groups using an. A brief outline is given of the basis of analysis used in two computer programs, piglet and defpig, for analysis of pile group response.
This paper demonstrates that it is possible to use the pile group analysis presented as a practical method for solving design problems. Lpile solves the differential equation for a beamcolumn using a finite difference approach. Powerful 3d visualization of various pile group analysis results such as displacements, bending moments, shear forces and soil reactions. Pilegroup pile group analysis pile design software. Pile group size number of rows foundation design 33. Rspile is a general pile analysis software for analyzing driven pile installation, axially loaded piles and laterally loaded piles. Pile group analysis spreadsheet program written in msexcel for the purpose of analysis of pile groups with rigid caps using the elastic method. Analysis of vertical bearing capacity of a pile group of in cohesive soil as a rigid earth block according to fhwa standards.
Specifically, the properties of the pile group are calculated, and then based upon the applied vertical and horizontal loadings, the. Theory, practice and software about us civilax based to server in civil engineering provides etabs and sap2000 tutorials, civil engineering spreadsheets, civil engineering ebooks and many more civil engineering downloads. Flexibility coefficients and interaction factors for pile group analysis. Detailed information is presented on pile design principles and criteria. The program was developed to compute the distribution of loads vertical, lateral, and overturning moment up to three orthogonal axes applied from any multiple locations in the pile cap to piles arranged in a group. A study of two methods article pdf available in journal of geotechnical engineering 1093 march 1983 with 2,683 reads how we measure reads.
Pile supported foundation pile cap analysis and design. A comprehensive lrfd design example problem is presented and solved to demonstrate the development and application of design charts using both static and field analysis methods. A computer program for basic pile group analysis, cpga, was developed through the computeraided structural engineering case project by the task group on pile structures and substructures. A summary of the main capabilities and limitations of some of the computer programs discussed above is presented in table 10. Analysis of pile group behavior astm international. High strain dynamic load tests, also called pda tests, assess the capacity of several piles in a single day. From the available borehole data it was assessed that the geological pro. The problem of a laterally loaded pile embedded in soil is closely related to the beam on an elastic foundation. Innovative geotechnics provides innovative geotechnical design tools for soilstructure interaction and deep foundation problems such as single piles or pile groups under lateral and vertical loads. This report describes the development of a performancebased framework to create seismic designs of pile group foundations that consider all potential levels. The programs are briefly introduced and the basis of each program is described.
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