Bridge Software Institute
Spring, 2007 Issue #9
Welcome to the spring issue of the BSI Newsletter!
In this issue's Technical Corner we will discuss some of the new features available with the
release of FB-MultiPier v4.11.
The articles 'Technical Corner' and 'Discussions' are open for input from all readers. If you
have a topic that you think should be discussed, let us know. Did you create a great model
with features that you want to share? Everyone is welcome to submit articles for possible
inclusion in subsequent issues. Please contact BSI at BSl@ce.ufl.edu with your ideas.
What's New at BSI
We would like to announce the release of the new FB-MultiPier v4.11. The program is
available for download from the BSI website.. The new version contains fixes to the latest
reported bugs and also includes a number of new features. The new features include:
-In 3D Edit Window and 3D Bridge Window, added options to hide various node types,
i.e. column nodes, pile cap nodes, pier cap nodes, cantilever nodes and pile node using
the right click mouse option.
-Added Element Data Dialog in the 3D Edit Window
-Added Pier Cross Section Table for input of all pier cross section data from a single
table. This can speed up the data entry process.
-Added file viewing feature/search option for viewing .out file. This allows for quick
access to the different portions of the text output file.
-Global Axes in all 3D Windows
-Bearing Rotation option
-New Soil Type: Limestone (McVay): No 2-3 Rotation
-Standalone version of Soil Table, which can be downloaded and used free of charge.
In this table one can toggle between SI and English units. The table can be imported
into FB-MultiPier. (See example below Fig. 8)
We also have a number of short tutorials that are available on our website. These self-guided
tutorials demonstrate the use of different features of the program. The aim of these tutorials is
to introduce the users of all levels to new and existing features of the program. We will add
new tutorials regularly to better communicate and explain the use of our program.
Henry Bollmann P. E.
What's New at BSI
New Release v4.11
Tutorial's on BSI
Make sure you have
the most current
PO Box 116580
New Features Modeling Tips
Bearing Angle Rotation and Pier Rotation (Fig. 1) can be set at any angle on the Bridge Page. In Fig. 1, the Pier is
skewed 45 deg. and the Bearings are set at 0 deg. aligned with the superstucture.
Fig. 2 R9. 3
Mat foundation piles (Fig. 2) can be quickly changed to drilled shafts Fig. 3 by using the Add/Remove Cap and
Add/Remove Pile feature in the Pile Edit Window. The pile cap elements in Fig. 3 serve only to connect the columns to
the shaft and must be stiff in order to transfer the forces as a rigid link. The unit weight of the pile cap element would
typically be given a value of zero. The column is attached to the Pile Cap via four rigid links as described in
Help>General Modeling> Column Connection to the Pile Cap.
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A new soil model "Limestone (McVay): No 2-3 axis Rot" (Fig. 4) allows the user to either exclude or include the effect of
side shear in soil-pile interaction using the P-Y curve of Florida limestone during the analysis This option is activated by
choosing the Edit button; it is defaulted off (Fig. 5) and can be activated by checking "Soil Resistance due to Pile
Rotation about 2 and 3 axes" from the Additonal Soil Properties dialog (Fig. 6). When the option is turned on to include
the side shear effect in the soil response, the program adds two additional degrees of freedom with respect to rotation
about 2- and 3-axis at soil springs and computes stiffness terms based on force equilibrium. However, the user should
use this option with the necessary caution and only where the use is justified.
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SELECTIVE fF 71T qUTPUJT CONTrC.1L
SOIL BEHAVIOR The UniverSity Of Florida, Florida Departmint
NUMBER OF HODES FOR EACH SPAN (BRIDGE DECK) of Transportatlon, Ors. Marc Holt, Mike McVay
BRIDGE SPAN PROPERTIES cliff Hays Mark wiliams and Petros Christou
LOAD FACTORS FOR SELF WEIGHT AND BUOYANCY F dicllaim any warranty, eXprssed or lpoled,
P I E R including but not limited o, an, ir'. Id
GEMERAL INFORMATION warranty of fircnet for a partti. lar I~ Iris
GRID DATA INFORMATION or accuracy of the FE-Pier s.oft.are t
ANALYSIS OPTIONS The developers shall not be liable for any damages
Surrnary of Displacerients at Pile Heads incurred through the use Of FB-Hul1IPrCe
PILE SEG ENT INFORfMATIOH DATA
SECTION DATA FOR SECTION/SEIMENT :
PILE SET DATA DESCRIPTION ::: PF M U T I P I E R ::
INPUT FOR STRUCTURAL ANALYSIS FB-MultiPier version 4.11
GENERAL PIER INFORMATION DATA p
MATERIAL PROPERTIES FOR PILE CAP AND FRAME (PI
PIER MEMBER CONNECTIVITY written by Marc Hoit, Mike McVay, Cliff Hays
PILE CAP ELEMENT CONNECTIVITY Mark william, Petros ChritSto
GENERAL LOAD DATA
SPAN (BRIDGE DECK) LOAD DATA Civil & CO4ttal Enr,inerrring, Ur,iv.rs'it> of Florida
ANALYSIS RESULT5 S upporced by Floriaa Oep'Tareient of Tranjporcatlon
RESULTS FOR LOAD CASE 4 and the Feaerisl m14lQn A.mlnrristrrarlon
MAXIMUM STRAINS IN THE PILES The program calculates the Response
SLU OF TOTAL SOIL SPRING LOADS of the Bridge Pier Pile soil Structures
Analytical Force Results for each Pile
ANALYTICAL PILE CAP SHELL STRESS RESULTS The &nal,sis includes PreL.ad. S1atc,
DASHPOT FORCES Oynamlic lcipor.Pn SpectrWmln r Time hl;tor-r)
CONVERGENCE REPORT or Push Over
MAXIMUM STRAINS IN THE PILES
ANALYTICAL FORCE RESULTS FOR PIER I The PrOFgra HandleS NOrninear Soil Belvio,0 .
ANALYTICAL PILE CAP SHELL STRESS RESULTS Linear Pile Cap and Linear and HonLinear Piles snd Piers
UNIAXIAL INTERACTION DIAGRAM
FINAL M AXiMtASJMINIMUMS FOR ALL LOAD CASES
eaxiumi/Mintnium Pile Forces Contact: Bridge Software Institute for Support
HaximuTi/1inimui Soil Forces HTTP;//BSI-WEB.CEUFL,EDU
Maximrtum/itnitnuin Pile oisplacements
Maximuil Vi4 f mui Coluin Forces ..---............ .................................
MaximanrLMi nimum Pier Cap Forces
anialyi; Start : 4:0S3p
analysis End : 4:Opm
anal (.Is Time : 1 seconds
Outpul File Selected: C'Progrern Files\Tect Progrom\FB-Mun~Pler.ODefouFiles\leaute,out EA
Results Viewer (Fig. 7) is a new feature, which allows the user to browse the .out file by Headers. This feature is
available from the Control menu > View Analysis Data > Results Viewer. By selecting a Header in the Header List the
Output Results is scrolled to the location in the output file. For complete instructions on using the results viewer check
the Help Manual.
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Standalone version of Soil Table. Soil Table Tutorial
Henry Bollmann P. E. Research Engineer, Bridge Software Institute
"FB-MultiPier only allows me to generate a pin or a fixed connection between pile and cap. What options do I have for modeling
The program allows for multiple cross-sections along each pile of a pile set. Segment one (at the pile head) can be dimensioned
and reinforced in such a manner that the assumed strength of the connection is modeled. A very common example is the
assumed connectivity of a prestressed pile embedded only a foot or two into a pile bent cap. One may wish to take advantage of
the partial fixity, particularly for an extreme event case. By viewing the strength interaction diagrams, generated by the software,
one can quickly see if the assumed behavior will be met.
Recently we encountered an interesting model where the foundation consisted of two different pile types. A few drilled shafts
carried all the horizontal forces and a multitude of small pre-cast piles carried ONLY axial compression. For this case the
designer modeled the small piles using a segment located at the pile head which had the desired axial compressive
characteristics but with almost no bending resistance and a separate soil set was specified which allowed for no axial soil
resistance other than the one way tip compressive resistance.
"What is the best use for the MultiPier option?"
This release of FB-MultiPier allows for the independent rotation of the bearings and substructure unit, as shown above. This
feature enhances the usefulness of a multiple pier model when the substructure is skewed to the superstructure. The multiple
pier models can be created very rapidly by copying one substructure unit and then editing each unit. These models are useful to
establish the relative stiffness of bridge units and the overall force distributions. For the case of vessel collision loading this
multiple pier model is particularly powerful. If a multiple pier model is used for purposes other than establishing global force
distributions to the foundations, then users should first verify that the bearing reactions calculated by the program are what is
expected. Modeling assumption/approaches of Multi-Pier must be well understood. For instance, the users may have to adjust
the properties of superstructure by trial and error such that the transfer beam would represent a realistic system stiffness of
bridge span and girders (and diaphragm where applicable) in order to achieve a desired load distribution to the bearings,
particularly when multiple bearings are specified.
BSI Program Status
T l FB-MultiPier V4.11 Download a FREE demo today!
i Released: May 8, 2007 Continuing Development Technical Support Available
FB-MultiPier is the successor to FB-Pier. In addition to all the capabilities of FB-Pier the FB-MultiPier program allows for
the modeling of an entire bridge that consists of multiple piers that are connected with bridge spans. In addition to the
multiple load cases and the AASHTO coefficients that are available in FB-Pier, the new program is capable of performing
dynamic analysis for the entire bridge. For more information about FB-MultiPier, click here.
[-] FB-Deep V1.21 Download a FREE demo today!
Released: March 11, 2005 Continuing Development Technical Support Available
The FB-Deep computer program is a Windows based program used to estimate the static axial capacity of drilled shafts
and driven piles. The methodology is based upon Federal Highway Administration (FHWA) reports. FB-Deep guides the
user through pile and shaft materials data, shape and dimensional inputs, soil properties, and boring log info. FB-Deep
presents the data analysis in both clear graphical and text form. For more information about FB-Deep, click here.
nn FB-Pier V3.21
Released: October 15, 2004 Final Release Technical Support Available
This program has been replaced by FB-MultiPier and all sales or renewals will be directed to the FB-MultiPier program.
FB-Pier is still available for download by valid licensed holders.
FB-Pier was designed for the analysis of bridge pier structures composed of nonlinear pier columns and cap supported
on a linear pile cap and nonlinear piles/shafts with nonlinear soil. FB-Pier couples nonlinear structural finite element
analysis with nonlinear static soil models for axial, lateral and torsion soil behavior to provide a robust system of analysis
for coupled bridge pier structures and foundation systems. The program performs the generation of the finite element
model internally given the geometric definition of the structure and foundation system as input graphically by the designer.
For more information about FB-Pier, click here.
If you need to contact BSI for any reason you can use any of the methods below:
Online: bsi.ce.ufl.edu Email: firstname.lastname@example.org
Fax: (352) 392-3697
Bridge Software Institute
University of Florida
PO Box 116580
Gainesville, FL 32611
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