Bentley LEAP RC-PIER Manual – Reinforced Concrete Substructure Analysis and Design

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RC-PIER® is an integrated tool for the AASHTO Standard and LRFD analysis and design of reinforced concrete bridge substructures and foundations. By incorporating both LFD and LRFD specifications in one interface, RC-PIER makes the transition to LRFD simple and efficient. RC-PIER allows users to design multi-column and hammerhead piers, straight, tapered or variable caps, and circular, rectangular (tapered and non-tapered) or drilled-shaft columns. Footing types include isolated or combined, supported on either soil or piles. There is no limit to the number of loads, bearings and piles that may be included in the design. Analysis results are presented in a variety of easy-to-view formats.
The following highlights some of RC-PIER’s main features:
•Ability of dual design codes, AASHTO Standard and LRFD (Standard and California State Specifications), to design reinforced concrete.
•Ability of dual units, U.S. and Metric. Allowed to switch between the two units at any time during program execution.
•Quickly specify project and job descriptions, and select working units.
•Ability to define/view/edit pier data in upstation or downstation view.
•Ability to specify multi-column pier, hammerhead pier or integral pier.
•Specify pier to be at any skew angle.
•Ability to select cap shape, either straight, tapered, variable or integral pier.
•Specify horizontal or inclined cap top surface.
•Ability to select circular, rectangular, rectangular chamfered, rectangular filleted, octagonal and hexagonal column shapes.
•Specify column shape in X-direction, Z-direction, or tapered in both X and Z directions.
•Specify up to two lines of bearings.
•Specify different materials for column, cap, and footing.
•Ability to specify up to two levels of intermediate struts.
•Specify the column bottom to be either fixed or have a spring stiffness matrix specified for partial fixity.
•The spring matrix could be a diagonal matrix representing uncoupled springs or have full matrix representing fully coupled springs.
•Specify checkpoints where you want to obtain results in addition to member nodes.
•Easy modeling of structures with the help of 3-D graphics.
•Specify loads in individual load cases.
•Self-load of substructure is considered automatically.
•Automatically generate superstructure dead loads, live loads with or without permit vehicles, wind loads, wind load on live load, longitudinal/braking load, centrifugal load, temperature load, earthquake load, and vessel collision (LRFD) for integral pier or integral piers.
•Ability to save the live loads for live load generation in a library for repeated use.
Specify load groups to be considered.
•Specify user-defined load groups in a library for repeated use.
•Ability to define specific load groups specifically to carry out design considering plastic hinge moment of column.
•Carry out the three dimensional frame analysis of the bridge substructure.
•Ability to use either impact factor calculated by the program or manually input the impact factor.
•Select which cap, column, and footing design will be based on analysis results with impact factor.
•Ability to define other analysis/design parameters, such as strength reduction factor, cover, multi-presence factor, and crack control factor.
•Ability to specify material overstrength factors for axial and bending capacity.
•Ability to design members as per AASHTO LRFD Bridge Design Specifications, 4th Edition, with 2008 Interims and classify sections into T/I/C (Tension Controlled/In-Transition/Compression Controlled) Section or design as per prior codes.
•Ability to check crack control in LRFD either based on Z factor (LRFD 3rd Edition and earlier) or based on Exposure (LRFD Interims of 2005).
•View individual load case results, load combination results, and envelopes for load groups/limits.
•View member forces in global or member local axis system.
•View analysis result plot diagrams.
•Ability to automatically design cap/strut. The program will automatically generate the required reinforcement and produce satisfying flexural bar placement.
•Ability to specify stirrups in cap and check for adequacy or do auto design.
•Analyze existing piers and footings, specify reinforcements, and then calculate the capacity and compare it to the requirement.
•Ability to check the cap/strut for shear, torsion, cracking, and fatigue.
•Ability to perform either P-delta or Moment Magnification analysis for slender columns.
•For braced frames, compute the braced column k factor as per AASHTO LRFD Interims 2006, art 4.6.2.5.
•Automatically design the column for applied loads and generate the required reinforcement pattern.
•Define rectangular, circular, intersecting hoops or general rebar pattern.
•Define column reinforcement which is either vertical or parallel to column faces.
•Define reinforcement and determine section capacity for applied loads for a column.
•View interaction diagram(s) for the column.
•Ability to compute plastic hinge moment in a column at a user specified location or specify it manually.
•Ability to check cap, column and footing for seismic load combinations considering the plastic hinge moment in column.
•Specify and design isolated, combined, or strap footings.
•Specify and design spread or pile footings.
•Specify user defined pile patterns in a library for repeated use.
•Determine the soil pressure for service and factored loads.
•Either use program computed or your own input of soil pressures/pile reactions for design.
•Design the footing for flexure.
•Ability to check the footing for one-way or two-way shear.
•Option to check the footing for crack control and fatigue.
•Optional strut-and-tie method for analysis of hammerhead cap and isolated pile cap using the LRFD design code. 
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Bentley LEAP RC-PIER Manual - Reinforced Concrete Substructure Analysis and Design
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