Δωρεάν ηλεκτρονικός υπολογιστής πλάκας βάσης

ο Αμερικανός workflow designs the steel column and base plate to AISC 360-22 and AISC Design Guide 1 (3έκδοση), and the concrete support and anchorage to ACI 318-19. Sections are drawn from the AISC Steel Construction Manual (15ου Έκδοση) databases, in imperial or metric units.

Checks performed:

1. Column-to-base-plate weld check
2. Column bearing on the base plate
3. Ρουλεμάν από σκυρόδεμα
4. Base plate flexural yielding under compression load
5. Base plate flexural yielding under tension load
6. Anchor rod tensile rupture
7. Anchor rod shear rupture
8. Concrete breakout in tension
9. Concrete breakout in shear
10. Anchor pullout
11. Concrete shear pryout
12. Concrete side-face blowout in tension
13. Tension-shear interaction for anchor steel and for concrete

ACI 318-19 treats a single anchor and an anchor group under different provisions, and the distinction has a large effect on the projected breakout area that governs tension and shear capacity. Whether a layout behaves as separate anchors or as a group depends on the spacing relative to the embedment depth, and the calculator makes that determination from your geometry rather than asking you to. A four-anchor pattern at wide spacing and a twelve-anchor pattern at close spacing are each assessed under the correct case.

Ευρωκώδικας designs follow EN 1993-1-8:2005 for the connection, ΣΕ 1992-1-1:2004 for the concrete and EN 1992-4:2018 για άγκυρες, supported by SCI P358 and SCI P398 and the National Annex to BS EN 1993-1-8:2024. Both European and British section libraries are available, so UB, UC and SHS profiles can be used alongside HE and IPE sections.

Checks performed:

1. Column-to-base-plate weld check
2. Ρουλεμάν από σκυρόδεμα, with base plate flexural yielding under compression load
3. Base plate flexural yielding under tension load, using yield line analysis
4. Anchor steel failure in tension
5. Anchor steel failure in shear
6. Concrete cone failure in tension
7. Concrete edge failure in shear
8. Anchor pull-out
9. Concrete shear pryout
10. Concrete side face blow-out due to tension
11. Combined tension and shear interaction for anchor steel checks and for concrete checks
12. Initial rotational stiffness for fixed base plates

The tension-side calculation is where Eurocode differs most visibly from the American approach. Rather than an equivalent cantilever, ΣΕ 1993-1-8 works from an equivalent T-stub and a yield-line pattern in the plate, and the pattern that forms depends on where the anchors sit relative to the flange and web. The calculator identifies the governing pattern among the possible modes: Η πρόσβαση στο GSD γίνεται μέσω του Section Builder μέσα από τον Πίνακα ελέγχου, non-circular, or double curvature.

Two inputs that often need a workaround elsewhere are handled directly. Grout strength is selected as either below 30 MPa or at least 30 MPa, which sets the joint coefficient used in the bearing calculation. Anchor hole clearance is classified as clearance-free, code-compliant or non-compliant, which affects the shear resistance. Exposure class and structural class inputs drive the durability checks.

Αυστραλός designs follow AS 4100:2020 for the steel column and plate, ΟΠΩΣ ΚΑΙ 3600:2018 for the concrete support and AS 5216:2021 for cast-in anchorage. Sections come from the Australian libraries, with AS/NZS 3679.1 και 3679.2 grades for open sections and AS/NZS 1163 grades for hollow sections.

Checks performed:

1. Column-to-base-plate weld check, with weld category set as SP or GP
2. Ρουλεμάν από σκυρόδεμα
3. Base plate flexural yielding under compression load
4. Base plate flexural yielding under tension load
5. Anchor steel failure in tension
6. Anchor steel failure in shear
7. Concrete cone failure in tension
8. Concrete edge failure in shear
9. Anchor pull-out
10. Concrete shear pryout
11. Concrete side face blow-out due to tension
12. Combined tension and shear interaction for anchor steel checks and for concrete checks

ΟΠΩΣ ΚΑΙ 5216:2021 leaves several decisions to the engineer, and the calculator surfaces them as inputs instead of fixing them behind the scenes. Anchor ductility sets k7 for the steel shear check. The degree of restraint determines whether the anchor is treated as free to rotate or restrained at the plate, which changes the lever arm and the bending induced in the rod. Prying and the lever arm itself can be entered directly or left on the automatic calculation. Because each assumption appears in the input and again in the report, a reviewer can see what was assumed rather than reverse-engineering it from the numbers.

καναδικός designs use CSA S16:19 for the steel column and base plate and CSA A23.3:19 for the concrete support and anchorage, with reference to the CAC Concrete Design Handbook (3έκδοση). Sections come from the CSA libraries, including HSS G40.21 profiles and W shapes, with standard CSA grades for the column, ράβδοι πλάκας και αγκύρωσης.

Checks performed:

1. Column-to-base-plate weld check
2. Column bearing on the base plate
3. Ρουλεμάν από σκυρόδεμα
4. Base plate flexural yielding under compression load
5. Base plate flexural yielding under tension load
6. Anchor rod tensile rupture
7. Anchor rod shear rupture
8. Concrete breakout in tension
9. Concrete breakout in shear
10. Anchor pullout
11. Concrete shear pryout
12. Concrete side-face blowout in tension
13. Tension-shear interaction for anchor steel and for concrete

CSA A23.3:19 sets its anchor resistance factors through resistance-modification classifications rather than fixed values, and these are selected in the calculator as classifications. Choosing ductile or brittle for the steel-governed case, and Condition A or Condition B for the concrete-governed case, updates the underlying tension and shear factors to the values the code requires. Each factor can still be overridden where a project specification calls for something different.

The Canadian workflow can also check base plate flexural capacity both parallel and perpendicular to the applied moment, which matters for plates close to square or where the anchor layout is not aligned with the bending axis.

Base plates are among the most repeated connections in structural steel, and most of the work in designing one is work a computer should be doing: checking dimensions against code minimums, running the same twelve checks across every load combination, writing up the calculation, and drawing the detail. The calculator automates all four.

Strength calculations assume the connection can be built as drawn. Before any capacity check runs, the calculator reviews the geometry for conflicts and buildability and reports the result in a Detailing Check Summary.

The checks detect clashes and non-conforming geometry: anchors spaced too closely, anchors too near the plate edge, a base plate with a larger footprint than the concrete supporting it, welds that foul the anchor positions. They also flag values that fall outside the range normally seen in practice, which catches genuine design problems and simple input errors alike — a thickness entered in the wrong units, a decimal point in the wrong place, an embedment depth that is an order of magnitude out.

The current checks are:

• Weld size — compared against the minimum and maximum required by the selected design code
• Anchor clearance — whether there is physical room to fit a washer and turn a nut, accounting for nearby welds and adjacent geometry
• Base plate edge distance — minimum anchor-to-edge distance for the selected code
• Embedded plate dimensions — compared against a suggested minimum of four times the anchor diameter
• Concrete splitting — minimum anchor spacing and minimum cover (not applied in the Australian workflow)
• Minimum anchor count — four anchors recommended as a minimum

A failed check names the dimension responsible, so the correction is obvious. Checks can be disabled individually in Design Settings, and where a flagged item is acceptable for the project you can override it and run the design anyway. These are the details that are cheap to fix at the design stage and expensive to fix on site, once the anchors are cast and the plate has arrived from the fabricator.

One click runs the full set of checks — steel, σκυρόδεμα, weld and anchorage — across every load combination in the model at once. The results table lists each check with its demand, its capacity, the demand-to-capacity ratio and the load combination governing that particular check, so you can see which combination is driving each result rather than only whether it passed.

The calculation report is built from the same run, with no separate write-up step. It contains the step-by-step working for every check, the referenced equation and clause number from your selected code, and scaled illustrations of the input geometry and the anchor check surfaces. Project name, Εταιρία, σχεδιαστής, project ID and client details carry through from the Details tab into the report header. Εξαγωγή σε PDF ή HTML.

The point of showing the full working is reviewability. A checker can follow the calculation line by line and see the assumptions rather than accepting a capacity figure and a pass mark, which is also what makes the output usable as a record of design for approval.

Once the design passes, the same model produces the detail drawing. The output is a proper CAD drawing with layers and annotations, not a screenshot of the model.

The sheet includes plan and elevation views, full dimensions, weld callouts, a load schedule and a title block. Callouts, drawing notes and title block information are all editable, the drawing can be scaled, and a long list of paper sizes is available. Download it as a PDF ready to issue, or open it in SkyCiv CloudCAD to develop it further — adjust layers, add notes and lay out the sheet without leaving SkyCiv.

The time saving is straightforward: nobody redraws the base plate by hand, which takes a drafter a couple of hours per detail. The saving holds up through revisions too. When the plate thickness changes or an anchor moves, regenerate the drawing and the new sheet comes out with the updated geometry and dimensions already in place, rather than sending someone back into the CAD file to chase every affected annotation.

Any design you can set up in the calculator can also be run programmatically through the SkyCiv API, SkyCiv Renderer API standalone.baseplate namespace. Submit the design object, receive the full check results, and generate the calculation report without opening the interface.

A run uses two functions: standalone.baseplate.start to open the session, then standalone.baseplate.check to submit the design. Because both are required, each base plate set-up costs 2 Πιστώσεις API.

The API supports all four major code families — American, Αυστραλός, Canadian and Europe — and the request structure is the same for each. The differences between codes are confined to the resistance factors, design settings and material values, so an integration built for one code extends to the others without restructuring the payload.

The case for the API is volume. If you are designing the same connection across forty columns in a warehouse, sizing plates for a product line of mounting frames, or building a configurator that has to produce a base plate on demand, running them as a batch replaces the work of setting up each model by hand.

Full input reference and sample payloads for each design code are in the standalone.baseplate API documentation.

A first base plate model takes under ten minutes. Choose a design code and a starting template, then work through the tabs in order.

1. Project details. Set your units and enter the project name, Εταιρία, σχεδιαστής, project ID and client. These carry through to the calculation report and detailed drawing, so filling them in now saves editing the report later. Design factors and check options sit here as well, under Design Settings, already populated with the defaults for your chosen code.
2. Γεωμετρία. Select the column shape — I-section, ορθογώνια ή τετράγωνο HSS, or circular HSS — then pick the profile from the AISC, ΣΕ, AS or CSA database and set the grade, ή εισαγάγετε προσαρμοσμένα Fy και Fu. Set the base plate width, length and thickness, add grout if the connection has it, and define the concrete dimensions, compressive strength and whether it is cracked or uncracked. Auto-Size will proportion the plate to the column and the concrete to the plate; it works from geometry only, so treat it as a starting point rather than a design.
3. Άγκυρες. Set the anchor diameter, grade and embedded end condition — straight, rectangular plate, circular plate or hook — along with the embedment length έχω. You can also choose to use welded plate washers, if supported by the selected design code. Positioning is covered in the next section.
4. Συγκολλήσεις. Choose fillet or CJP/FPBW, set the weld material and leg size, and adjust the setback on I-sections to clear the fillet radius. You also choose how compression reaches the plate: through the welds, or by direct bearing of the column section on the plate, which is the default and the usual arrangement where the column end is prepared for bearing.
5. Column loads. Enter factored loads — axial, shear and strong-axis bending. Axial follows the convention that positive is compression and negative is tension. Add as many load combinations as the design needs; each check reports which one governs. If the structure is modelled in SkyCiv Structural 3D, these values are the support reactions.
6. Run the checks. The Detailing Check Summary comes first. Clear it, or override where appropriate, then run the design checks for the full results table and the detailed calculation report.
7. Generate the detailed drawing. Once every check passes, generate the drawing. Print it as it comes, in the default style and layout, or open it in SkyCiv CloudCAD to develop it further. CloudCAD is SkyCiv’s own drafting software, and editing there requires a subscription.

Anchor layout is built from pre-defined patterns rather than placed anchor by anchor. Choose the pattern that matches your detail and the calculator positions the rods symmetrically about the column for you, which removes the layout arithmetic and rules out the asymmetry behind most anchor setting-out errors. The patterns available depend on the column shape:

• I-section columns — Corners, Flange Only, Web Only
• Rectangular and square columns — Corners, Top/Bottom Only, Left/Right Only, Όλες οι πλευρές
• Circular columns — Corners

Within a pattern you control the number of anchors, the spacing in each direction and the edge distance to the plate edge. The pattern sets the arrangement; you set the dimensions. Fully custom positioning, meaning individual anchors at arbitrary coordinates, is not yet included.

Place your anchors in the tension zone

Knowing where to put anchors so they actually work in tension is one of the more experience-dependent parts of base plate design, so the calculator marks it out for you. The tension zones are pre-defined on the plate and displayed on the model, and where they sit follows the support condition:

• Pinned bases — the zones are the areas closest to the column faces: alongside the flanges and web on an I-section, or along the faces of an HSS.
• Fixed bases under strong-axis bending — the zones sit outside the flanges, between each flange and the nearer edge of the base plate.

These are the areas where an anchor engages in tension, so they are where you want your rods whenever a load case produces uplift or net tension. Those anchors are what holds the column down, and placing them inside the zone keeps the layout consistent with how the tension is calculated.

Turn on Εμφάνιση ζωνών τάσης άγκυρας in the figure settings and the zones appear on the plate as you position anchors, so you can see the right placement while you are still choosing spacing and edge distances. The Anchor Data Summary confirms it afterwards, listing every anchor with its ID, coordinates and whether it sits inside a zone.

If your base carries pure compression with no uplift case, anchor position is a detailing decision and placing rods outside the zones is entirely reasonable. The zones matter once tension enters the picture.

Single Anchors and Anchor Groups

Anchor spacing does something else worth understanding: it decides whether your anchors are assessed as individual anchors or as a group.

The distinction applies to the concrete checks only. Steel tension and shear rupture are always evaluated per anchor, since the capacity of a rod depends on its own area and grade. Concrete capacity works differently, because it depends on the volume of concrete an anchor can mobilise, and neighbouring anchors compete for the same concrete.

What separates the two cases is whether the projected failure surfaces overlap. Anchors that are widely spaced, or shallowly embedded, project cones that stay clear of one another, so each anchor is checked on its own. Bring them closer together or embed them deeper and the cones intersect. From that point the concrete governs the capacity of the whole group, and the group capacity is not the sum of the individual anchor capacities.

The codes use separate equations for the two cases. Under ACI 318-19, tension breakout for a single anchor is Ncb; for a group it becomes Ncbg, which works from the combined projected area and adds an eccentricity modification factor to account for tension being applied off the group’s centroid. Shear breakout and side-face blowout follow the same pattern, each with its own group form. Anchor pullout is the exception: it is always evaluated per anchor, since it is governed by bearing at the embedded end rather than by a concrete cone.

The calculator determines which case applies from your geometry and displays the projected failure areas on the model, so the group behaviour is something you can see alongside the numbers as you set out spacing, embedment and edge distances.

For a fuller treatment of each ACI failure mode and what drives it, δείτε το SkyCiv guide to ACI anchor checks.

Frame analysis usually treats a column base as either pinned or fully fixed. Actual base plates fall between the two. ΣΕ 1993-1-8 therefore expects a fixed base to be justified by the stiffness of the connection.

For Eurocode designs with a fixed base, the calculator computes the initial rotational stiffness Sj,ini of the connection and classifies it against the code limits. The classification is expressed as a multiplier on the column’s own EI/L, with boundaries at the code’s lower and upper bounds, so the output tells you directly whether the base can be treated as rigid, semi-rigid or nominally pinned in the analysis model.

Two inputs are required for the check to run:

1. Provide column height, entered in the Geometry tab. The classification compares connection stiffness against the flexural stiffness of the column it supports, so the same base plate can be rigid under a short stocky column and semi-rigid under a tall slender one.
2. Provide both moment and axial load in the load case. Rotational stiffness is a moment-rotation property, so a purely axial case has no rotation to classify. A moment-only case does not work either. The Eurocode formulation works from the load eccentricity, e = M/N, which has no finite value when the axial load is zero. Both components need to be present for the connection to have a stiffness to report.

If the result comes back below the rigid boundary, the levers are a thicker plate, a longer lever arm between the anchor group and the compression zone, or a stiffer anchor arrangement. Each re-solves immediately, so the effect of a change is a few seconds away rather than a rebuild of the model.