The image below is the first portion of a detail report for a concrete beam showing the member information, warnings, force diagrams, code checks, and span information.
You can tell the Member Type by looking at the black title in the upper left corner next to the red member label. This title will always show the member type (Beam).
The Member Information in the text above the force diagrams shows basic member information as well as the Concrete Stress Block type used in the solution.
The next section of the detail report contains the Member Force Diagrams. The diagrams shown are envelope diagrams of all solved load combinations. Any Unused Force Warnings or critical Design Warnings will be shown directly below the force diagrams in the detail report. An enlarged interactive member force diagram can be accessed by clicking on the desired diagram.
Beams - Design Results
Each enlarged diagram will also have a slider bar at the bottom of the window for checking forces at all loca-tions along the member. There is also an Abs Max button that will jump the slider bar to the absolute maximum value in the diagram. Note that once an enlarged diagram is opened, diagrams for other forces may be accessed via the pull down menu on the left.
The Code Check Information directly below the force diagrams is a summary of the governing checks for bend-ing and shear, their location, and the section capacities at those locations. Separate bendbend-ing checks for the most critical top and most critical bottom condition are given. Gov Muz Top and Gov Muz Bot represent the gov-erning ultimate moment in the top and bottom of the beam respectively. Gov Vuy represents the govgov-erning ulti-mate shear along the local y axis of the beam.
The values phi*Mnz Top and phi*Mnz Bot represent the nominal moment strength in the top and bottom of the beam respectively, reduced by the appropriate Strength Reduction Factor, Phi, as indicated in the
code. Likewise, the value phi*Vuy represents the nominal shear strength in the beam, reduced by the appro-priate Phi Factor.
There is also general concrete, reinforcement, and bar cover information about the section provided which you would need if you were doing a hand check. Concrete Type (Normal Weight vs Light Weight) is automatically determined from the Concrete Weight density per the ACI code. λ is taken from theMaterialsspreadsheet. The E_Concrete value shown here is either the value entered on the Materials Spreadsheet or is the calculated value based on the given f’c and weight density (if the 'E' value was left blank on the Materials Spreadsheet).
The Span Information gives the start and end of each span centerline within the member, as well as the dis-tance from the support centerline to the face of the support for each end of the span.
The next portion of the detail report shown below contains detailed information for the placement of the Bend-ing Steel and the BendBend-ing Span Results for each span. The bendBend-ing capacity for the governBend-ing section in each span is shown as Mnz, the nominal moment strength. Rho Min and Rho Max are the minimum and maximum required reinforcement ratios at each location. These values are based on the minimum and maximum rein-forcing requirements for flexural members as described in ACI 318-11 sections 10.5.1 and 10.3.3/10.3.5 respec-tively. Rho is the ratio of reinforcement corresponding to the area of steel provided at each location, As Prvd. The As Req value is the area of steel required at each location.
Note:
l Per ACI 318-11 Section 10.5.3, the reinforcement ratio (ρ) chosen by the program can be less than ρmin when As Provided exceeds AsRequired by more than 33%
The next portion of the detail report, shown above, contains detailed information for the placement of the Shear Steel and the Shear Span Results for each span. Shear results are shown by region within each span. The number of regions used is a function of the shear diagram, with the maximum number of regions being taken from the Shear Regions setting on the Design tab of the Global Parameters Dialog. The number, size, and spac-ing of reinforcspac-ing bars is given for each region. Also indicated is the nominal shear strength, Vn, in each region.
The portion of the nominal shear strength provided by the concrete and the steel, Vc and Vs respectively, is given for each region. The area of steel required, As Reqd, and the area of steel provided, As Prvd, are also given for each shear region and are reported as 'area of steel per unit dimension', i.e. in2/in or mm2/mm.
It should be noted that the values for Mn and Vn given in this section of the detail report are the UNREDUCED nominal capacities of the member at each span/region. The actual design capacities would be obtained by mul-tiplying these values by their respective Phi Factors indicated in the code.
The last section of the detail report shows the Beam Reinforcement Detailing Diagrams. The Rebar Detailing portion of the report shows elevation views of the beam complete with top and bottom flexural reinforcement indicated for the left, middle, and right portions of each span. The number and size of bars required in each sec-tion is indicated on the top middle of each drawn bar. The required length of each bar is indicated on the bottom middle of each drawn bar in parenthesis. Development lengths are shown in parenthesis at one end of each bar and is represented by a dashed line. For bars at the ends of the beam, hook lengths are given in addition to the development lengths and are shown in brackets.
Note:
l Development lengths are calculated per ACI 318-11 Section 12.2.2 and 12.5.2. No additional factors are used, aside from the lightweight modification factor.
Beams - Design Results
The values shown at the bottom corner of each span indicate the distance from the start of the beam to the face of a support. Flexural bars at the ends of the beam are measured beginning at the face of the support and bars at intermediate supports are measured to the center of the support.
The number, size, and spacing of shear reinforcement is also indicated below each span in the corresponding shear region. Each shear region is indicated by vertical lines at the bottom of the beam.
The Cross Section Detailing portion of the report shows cross sectional views for the start, middle, and end of each beam span. The number and size of flexural bars for each cross section are shown as well as the orientation of the shear ties/stirrups. The clear cover to each stirrup for the top and sides is shown. The overall beam dimensions for each span are indicated on the 'Start' cross section.