https://structloads.com/blogs Notes, worked examples and explainers on load takedowns, tributary areas and structural load paths. en Tue, 28 Jul 2026 06:06:31 GMT https://structloads.com/blogs/udl-on-a-beam-from-tributary-area https://structloads.com/blogs/udl-on-a-beam-from-tributary-area Thu, 04 Jun 2026 00:00:00 GMT Turn a floor pressure into a uniform line load on a beam: multiply the tributary width by the load. Here is the method, beam self-weight, and the two-way equivalent UDL. load-paths https://structloads.com/blogs/how-to-calculate-beam-reactions-from-a-slab https://structloads.com/blogs/how-to-calculate-beam-reactions-from-a-slab Thu, 04 Jun 2026 00:00:00 GMT A slab loads a beam, and the beam passes that load to its end supports as reactions. Here is how to find them by statics, for uniform, triangular and trapezoidal loads. load-paths https://structloads.com/blogs/concrete-slab-self-weight-calculation https://structloads.com/blogs/concrete-slab-self-weight-calculation Thu, 04 Jun 2026 00:00:00 GMT Slab self-weight is thickness times density. Reinforced concrete is about 25 kN per cubic metre, so a 150 mm slab weighs about 3.75 kN per square metre. Here is how to get it right. fundamentals https://structloads.com/blogs/typical-floor-live-load-values-by-occupancy https://structloads.com/blogs/typical-floor-live-load-values-by-occupancy Thu, 04 Jun 2026 00:00:00 GMT Floor live load depends on use, and codes set minimum values by occupancy. Here is a reference table for offices, homes, retail, storage and more, in kPa and psf. codes https://structloads.com/blogs/how-to-do-a-structural-load-takedown https://structloads.com/blogs/how-to-do-a-structural-load-takedown Thu, 04 Jun 2026 00:00:00 GMT A load takedown traces gravity loads from the slabs down to the foundation. Here are the five steps, a worked column, and the checks that catch errors. load-paths https://structloads.com/blogs/foundation-reactions-from-load-takedown https://structloads.com/blogs/foundation-reactions-from-load-takedown Thu, 04 Jun 2026 00:00:00 GMT The foundation reactions are where a takedown ends: the load each column and wall delivers to the ground. Here is how to read them and turn them into foundation design loads. load-paths https://structloads.com/blogs/load-takedown-spreadsheet-vs-software https://structloads.com/blogs/load-takedown-spreadsheet-vs-software Thu, 04 Jun 2026 00:00:00 GMT Spreadsheets are flexible and free but slow on geometry; software automates tributary areas and stacking. Here is an honest comparison and when each one wins. workflow https://structloads.com/blogs/how-to-read-a-structural-floor-plan https://structloads.com/blogs/how-to-read-a-structural-floor-plan Thu, 04 Jun 2026 00:00:00 GMT A structural floor plan tells you the grid, the supports, the spans and the loads. Here is what each element means and what to extract for a load takedown. workflow https://structloads.com/blogs/tribby3d-alternative https://structloads.com/blogs/tribby3d-alternative Thu, 04 Jun 2026 00:00:00 GMT Looking for a Tribby3d alternative for tributary areas and load takedown? StructLoads is a free, browser-based option. Here is an honest comparison of the two. workflow https://structloads.com/blogs/what-is-a-transfer-beam https://structloads.com/blogs/what-is-a-transfer-beam Thu, 04 Jun 2026 00:00:00 GMT A transfer beam carries a column or wall that stops part-way down and redistributes its load to supports below. Here is what it does, why it is used, and how load flows through it. load-paths https://structloads.com/blogs/roof-live-load-vs-snow-load https://structloads.com/blogs/roof-live-load-vs-snow-load Thu, 04 Jun 2026 00:00:00 GMT A roof carries both a minimum roof live load and a snow load, and the larger governs. Here is the difference, how each is found, and which one to design for. codes https://structloads.com/blogs/lintel-load-calculation https://structloads.com/blogs/lintel-load-calculation Thu, 04 Jun 2026 00:00:00 GMT A lintel carries the wall and floor above an opening. Here is how to find its load, the triangular masonry-load idea, and a worked example for a door or window head. load-paths https://structloads.com/blogs/how-to-check-a-load-takedown https://structloads.com/blogs/how-to-check-a-load-takedown Thu, 04 Jun 2026 00:00:00 GMT Four quick checks catch most load-takedown errors: area balance, reaction ratios, total load, and units. Here is how to run each one and what a failure tells you. workflow https://structloads.com/blogs/free-structural-engineering-student-software https://structloads.com/blogs/free-structural-engineering-student-software Thu, 04 Jun 2026 00:00:00 GMT Students need tools that teach, not just compute. StructLoads is a free browser tool for load takedowns and tributary areas, with no install and a visible formula trace. workflow https://structloads.com/blogs/manual-vs-software-load-takedown https://structloads.com/blogs/manual-vs-software-load-takedown Thu, 04 Jun 2026 00:00:00 GMT A hand load takedown teaches the method and stays transparent; software is faster and exact on geometry. Here is an honest comparison and when each one is the right call. workflow https://structloads.com/blogs/how-to-do-a-load-takedown-fast-and-check-it https://structloads.com/blogs/how-to-do-a-load-takedown-fast-and-check-it Thu, 04 Jun 2026 00:00:00 GMT Speed in a load takedown comes from drawing once and checking smart. Here is the fast workflow and the three checks that catch most errors. workflow https://structloads.com/blogs/one-way-vs-two-way-slabs https://structloads.com/blogs/one-way-vs-two-way-slabs Thu, 04 Jun 2026 00:00:00 GMT Whether a slab spans one way or two changes how load reaches the beams, and what shape the tributary areas take. Here is how to tell them apart and when the distinction actually changes your numbers. fundamentals https://structloads.com/blogs/triangular-and-trapezoidal-loads-on-beams https://structloads.com/blogs/triangular-and-trapezoidal-loads-on-beams Thu, 04 Jun 2026 00:00:00 GMT A two-way slab loads its beams with triangles and trapezoids set out by the 45-degree rule. Here is where the shapes come from, the equivalent UDL, and a worked example. fundamentals https://structloads.com/blogs/how-to-export-a-load-takedown-report https://structloads.com/blogs/how-to-export-a-load-takedown-report Thu, 04 Jun 2026 00:00:00 GMT A load takedown is only useful if you can hand it over. Here is how to export it as a PDF, Excel or CSV, what each format is for, and what a good report contains. workflow https://structloads.com/blogs/best-load-takedown-software https://structloads.com/blogs/best-load-takedown-software Thu, 04 Jun 2026 00:00:00 GMT Which tool should you use for a gravity load takedown? A fair comparison of StructLoads, dedicated tributary tools, calc platforms, full analysis suites and spreadsheets. workflow https://structloads.com/blogs/45-degree-rule-for-tributary-area https://structloads.com/blogs/45-degree-rule-for-tributary-area Thu, 04 Jun 2026 00:00:00 GMT The 45-degree rule sets tributary boundaries by bisecting the angles between supports. Here is what it is, how it relates to the midline method, and when it applies. fundamentals https://structloads.com/blogs/tributary-width-for-a-beam https://structloads.com/blogs/tributary-width-for-a-beam Thu, 04 Jun 2026 00:00:00 GMT A beam's tributary width is half the spacing to the parallel member on each side. Multiply it by the floor load for the uniform load on the beam. Here is the method with numbers. fundamentals https://structloads.com/blogs/what-is-a-load-path-in-a-building https://structloads.com/blogs/what-is-a-load-path-in-a-building Thu, 04 Jun 2026 00:00:00 GMT A load path is the continuous route a load follows to the ground. Here is what it means, the gravity and lateral paths, and why continuity and redundancy matter. fundamentals https://structloads.com/blogs/fastest-way-to-calculate-column-axial-loads https://structloads.com/blogs/fastest-way-to-calculate-column-axial-loads Thu, 04 Jun 2026 00:00:00 GMT The fastest way to get column axial loads is to draw the plan once and let the tributary areas and stacking resolve. Here is the workflow and why it beats sketching. load-paths https://structloads.com/blogs/snow-load-calculation-asce-7 https://structloads.com/blogs/snow-load-calculation-asce-7 Thu, 04 Jun 2026 00:00:00 GMT ASCE 7 turns ground snow into a roof snow load with a handful of factors. Here is the flat-roof and sloped-roof formula, what each factor means, and a worked example. codes https://structloads.com/blogs/eurocode-load-combinations-explained https://structloads.com/blogs/eurocode-load-combinations-explained Thu, 04 Jun 2026 00:00:00 GMT EN 1990 sets the load combinations for European design. Here are the ULS expressions 6.10, 6.10a and 6.10b, the partial and psi factors, and a worked example. codes https://structloads.com/blogs/how-to-calculate-tributary-area-for-a-wall https://structloads.com/blogs/how-to-calculate-tributary-area-for-a-wall Thu, 04 Jun 2026 00:00:00 GMT A wall collects a tributary strip, not an area like a column. Here is how to find its tributary width, turn it into a line load, and where the strip method applies. fundamentals https://structloads.com/blogs/tributary-area-on-an-l-shaped-floor https://structloads.com/blogs/tributary-area-on-an-l-shaped-floor Thu, 04 Jun 2026 00:00:00 GMT The re-entrant corner of an L-shaped floor is where hand tributary sketches drift. Here is why, how clipping to the outline fixes it, and the area-balance check that proves it. fundamentals https://structloads.com/blogs/load-combination-worked-example https://structloads.com/blogs/load-combination-worked-example Thu, 04 Jun 2026 00:00:00 GMT One column, every gravity combination, worked end to end in both ASCE 7 and Eurocode. See exactly how service loads become a governing factored reaction. codes https://structloads.com/blogs/gravity-load-path-slab-to-foundation https://structloads.com/blogs/gravity-load-path-slab-to-foundation Thu, 04 Jun 2026 00:00:00 GMT Follow one gravity load from the slab through the beam, column and footing to the soil. Here is each handoff in the load path and why tracing it prevents errors. load-paths https://structloads.com/blogs/eurocode-vs-asce-7-load-combinations https://structloads.com/blogs/eurocode-vs-asce-7-load-combinations Thu, 04 Jun 2026 00:00:00 GMT ASCE 7 and Eurocode reach similar safety by different bookkeeping. Here is a side-by-side of the gravity combinations, the factors, and a worked comparison. codes https://structloads.com/blogs/tributary-areas-explained https://structloads.com/blogs/tributary-areas-explained Thu, 04 Jun 2026 00:00:00 GMT Tributary area is the single idea that turns a floor plan into column reactions. Here is the clean mental model, the midline method, and the cases where sketching it by hand quietly fails. fundamentals https://structloads.com/blogs/multi-storey-load-takedown-explained https://structloads.com/blogs/multi-storey-load-takedown-explained Thu, 04 Jun 2026 00:00:00 GMT In a multi-storey building, loads stack down the columns floor by floor. Here is how the top-down accumulation works, how transfers fit in, and a worked three-storey column. load-paths https://structloads.com/blogs/how-to-calculate-column-loads https://structloads.com/blogs/how-to-calculate-column-loads Thu, 04 Jun 2026 00:00:00 GMT A column's load is every floor it carries, added up. Here is how to find the axial load from tributary areas, stack it through floors, and factor it. load-paths https://structloads.com/blogs/asce-7-load-combinations-explained https://structloads.com/blogs/asce-7-load-combinations-explained Thu, 04 Jun 2026 00:00:00 GMT ASCE 7 gives the factored load combinations that size members. Here are the gravity LRFD and ASD combinations, what the factors mean, and a worked example. codes https://structloads.com/blogs/column-load-schedule-explained https://structloads.com/blogs/column-load-schedule-explained Thu, 04 Jun 2026 00:00:00 GMT A column load schedule lists every column with its loads, level by level, down to the foundation. Here is what it contains, how to build one, and how to read it. workflow https://structloads.com/blogs/import-a-floor-plan-from-dxf-or-pdf https://structloads.com/blogs/import-a-floor-plan-from-dxf-or-pdf Thu, 04 Jun 2026 00:00:00 GMT Stop redrawing plans from scratch: import a DXF or PDF and trace the geometry to place supports. Here is how plan import works, the difference between the two, and how to set the scale. workflow https://structloads.com/blogs/bearing-wall-load-takedown https://structloads.com/blogs/bearing-wall-load-takedown Thu, 04 Jun 2026 00:00:00 GMT A bearing wall carries floor load as a line reaction per metre, not a point load. Here is how to take a wall down, what feeds its line load, and how it reaches the footing. load-paths https://structloads.com/blogs/what-is-superimposed-dead-load https://structloads.com/blogs/what-is-superimposed-dead-load Thu, 04 Jun 2026 00:00:00 GMT Superimposed dead load is the permanent weight added on top of the structure's self weight: finishes, services, ceilings and partitions. Here is what counts and typical values. fundamentals https://structloads.com/blogs/how-to-calculate-footing-loads https://structloads.com/blogs/how-to-calculate-footing-loads Thu, 04 Jun 2026 00:00:00 GMT A footing carries the column above it plus its own weight. Here is how to find the load for bearing and for footing strength, using service and factored values. load-paths https://structloads.com/blogs/what-is-the-governing-load-combination https://structloads.com/blogs/what-is-the-governing-load-combination Thu, 04 Jun 2026 00:00:00 GMT The governing load combination is the one that produces the largest design effect on a member. Here is how to find it, why it varies, and a worked example. codes https://structloads.com/blogs/how-to-calculate-wall-line-load https://structloads.com/blogs/how-to-calculate-wall-line-load Thu, 04 Jun 2026 00:00:00 GMT A wall's line load is its weight per metre of length: height times thickness times unit weight. Here is the method, typical material weights, and a worked example. fundamentals https://structloads.com/blogs/tributary-area-vs-influence-area https://structloads.com/blogs/tributary-area-vs-influence-area Thu, 04 Jun 2026 00:00:00 GMT Tributary area is the floor that loads a member; influence area is the larger area whose load affects it. Here is the difference, the KLL factor, and why it drives live load reduction. fundamentals https://structloads.com/blogs/how-loads-transfer-from-a-slab-to-beams https://structloads.com/blogs/how-loads-transfer-from-a-slab-to-beams Thu, 04 Jun 2026 00:00:00 GMT A slab hands its load to the beams that support it, as a uniform strip in one-way action or as triangles and trapezoids in two-way action. Here is how, with the load shapes. fundamentals https://structloads.com/blogs/area-load-vs-line-load-vs-point-load https://structloads.com/blogs/area-load-vs-line-load-vs-point-load Thu, 04 Jun 2026 00:00:00 GMT Loads come in three forms: area loads on slabs, line loads on walls and beams, and point loads at columns. Here is what each means, its units, and how they convert. fundamentals https://structloads.com/blogs/column-load-takedown-by-hand-step-by-step https://structloads.com/blogs/column-load-takedown-by-hand-step-by-step Thu, 04 Jun 2026 00:00:00 GMT How to take one column down by hand: tributary area per floor, load per floor, accumulate down the building, then factor. A full worked example with numbers. load-paths https://structloads.com/blogs/free-tributary-area-calculator https://structloads.com/blogs/free-tributary-area-calculator Thu, 04 Jun 2026 00:00:00 GMT Need tributary areas without the sketch and spreadsheet? StructLoads is a free browser tool that computes them from a plan you draw, exactly and instantly. workflow https://structloads.com/blogs/tributary-area-of-an-edge-column-vs-corner-column https://structloads.com/blogs/tributary-area-of-an-edge-column-vs-corner-column Thu, 04 Jun 2026 00:00:00 GMT An edge column carries about half a bay; a corner column about a quarter. Here is why, with the geometry, the load ratios, and a worked comparison. fundamentals https://structloads.com/blogs/how-to-calculate-tributary-area-for-a-column https://structloads.com/blogs/how-to-calculate-tributary-area-for-a-column Thu, 04 Jun 2026 00:00:00 GMT A column's tributary area is the floor region nearest to it. Here is the half-bay method, the interior, edge and corner cases, and a worked example. fundamentals https://structloads.com/blogs/load-takedown-worked-example https://structloads.com/blogs/load-takedown-worked-example Thu, 04 Jun 2026 00:00:00 GMT A column reaction is just every floor above it, added up in the right order. Here is a full three-storey gravity takedown worked by hand, from slab pressures to a factored foundation load. load-paths https://structloads.com/blogs/dead-load-and-live-load-calculator https://structloads.com/blogs/dead-load-and-live-load-calculator Thu, 04 Jun 2026 00:00:00 GMT Need to turn floor build-ups and occupancy into dead and live loads fast? StructLoads is a free tool that computes them and carries them through a full load takedown. fundamentals https://structloads.com/blogs/interior-vs-edge-vs-corner-column-loads https://structloads.com/blogs/interior-vs-edge-vs-corner-column-loads Thu, 04 Jun 2026 00:00:00 GMT An interior column carries about twice an edge column and four times a corner. Here is why, the load ratios, and a worked comparison you can use as a sanity check. load-paths https://structloads.com/blogs/lrfd-vs-asd-load-combinations https://structloads.com/blogs/lrfd-vs-asd-load-combinations Thu, 04 Jun 2026 00:00:00 GMT LRFD factors the loads up and the strength down; ASD keeps loads near service and limits the stress. Here is the difference, the ASCE 7 gravity sets, and a worked example. codes https://structloads.com/blogs/dead-load-vs-live-load-explained https://structloads.com/blogs/dead-load-vs-live-load-explained Thu, 04 Jun 2026 00:00:00 GMT Dead load is the permanent weight of the structure; live load is the movable weight it carries. Here is the difference, typical values, and how each is factored. fundamentals https://structloads.com/blogs/how-to-size-a-column-from-axial-load https://structloads.com/blogs/how-to-size-a-column-from-axial-load Thu, 04 Jun 2026 00:00:00 GMT Once you have a column's factored axial load, a quick required-area estimate gives a trial size. Here is the preliminary method for steel and concrete, with worked numbers. load-paths https://structloads.com/blogs/factored-loads-vs-service-loads https://structloads.com/blogs/factored-loads-vs-service-loads Thu, 04 Jun 2026 00:00:00 GMT Service loads are the real, unfactored loads; factored loads are them multiplied by load factors for strength design. Here is the difference and when each is used. codes https://structloads.com/blogs/asce-7-live-load-reduction https://structloads.com/blogs/asce-7-live-load-reduction Thu, 04 Jun 2026 00:00:00 GMT A column carrying ten floors is not realistically loaded to the full design live load on every one at once. ASCE 7 lets you take credit for that. Here is the formula, the KLL factors, and a worked reduction. codes https://structloads.com/blogs/partition-load-allowance-explained https://structloads.com/blogs/partition-load-allowance-explained Thu, 04 Jun 2026 00:00:00 GMT Movable partitions are covered by a load allowance rather than counted one by one. Here is what the allowance is, typical values, and when a partition is counted as dead load instead. codes https://structloads.com/blogs/beam-tributary-width-calculator https://structloads.com/blogs/beam-tributary-width-calculator Thu, 04 Jun 2026 00:00:00 GMT Get a beam's tributary width and uniform line load without the sketch. StructLoads is a free tool that computes the strip each beam collects and turns it into a UDL. fundamentals