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IST Solar MMS Structural Design & Analysis Tool

Designing Solar Mounting Structures Just Got a Lot More Global: Inside IST SolStruct PV mounting structures v4.4

If you've ever tried to design a PV mounting structure for a project outside your home country, you know the pain. The wind load formula that works in Germany doesn't work in Brazil. The steel design checks that pass under IS 800 don't map cleanly onto AISC 360. And if you're an EPC bidding on projects across three continents, you end up either hiring local consultants for every site or forcing everything through one code and hoping it's conservative enough.
SolStructPV's new v4.4 release is built to close that gap — and it's worth a closer look at what it actually does under the hood.

Six New National Code Families in One Engine

The headline feature of v4.4 is native support for six additional design code families, each with its own wind model, load combinations, snow loads, column buckling curves, lateral-torsional buckling checks, and bolt/anchor rules:

AS/NZS (Australia/New Zealand) — AS/NZS 1170 series, AS 4100, AS/NZS 4600

GB (China) — GB 50009, GB 55001-2021, GB 50017, GB 50018, GB 50797

JIS (Japan) — JIS C 8955:2017 with AIJ allowable-stress steel design

NBR (Brazil) — NBR 6123, 8681, 8800, 14762

SANS (South Africa) — SANS 10160 and 10162 series

NBC/CSA (Canada) — NBC 2020 Part 4 with CSA S16-19

A Country Selector That Actually Tells You What You're Getting

Rather than pretending every country's building code is basically the same as, SolStructPV takes an honest, three-tier approach across roughly 50 countries in seven regions:

Implemented — the national code is built directly into the engine.

Based on — the national standard adopts one of the implemented families; you enter the national annex values and it maps accordingly.

Nearest — there's no dedicated implementation yet, so the closest matching family is used, and the output carries an explicit warning to check results against the actual national code.

Real Engineering, Not Just Wind Pressure Swapping

It would be easy to slap a select your country dropdown on top of a single wind formula and call it done. SolStructPV goes considerably deeper — each code family carries its own:

Wind pressure model (from V_R, w0, V0, v_b,0, or q50 depending on the country)

Load combination sets

Snow load provisions

Column buckling curve

Lateral-torsional buckling and N+M interaction checks

Slenderness limits

Bolt, net-section, and anchor design rules

IST Pitched Roof Solar MMS Structural Design Analysis Tool

How IST SolStructPV's Metal-Roof Rail Analysis Actually Works

Rooftop solar on a pitched metal roof looks simple from the ground: rails run up the slope, modules sit flush against the roofline, done. Structurally, though, it's one of the more unforgiving mounting configurations to get right — every gram of dead, live, wind and snow load has to travel through a chain of rails, L-feet, and the building's own purlins, with almost none of the self-weight ballasting effect that a flat-roof or ground-mount system gets for free. SolStructPV's Purlin-Mounted Rail-Based Solar MMS module is built specifically around that problem.

The Structural Model, Not Just a Layout Tool

Rather than treating a pitched-roof array as a simple tributary-area spreadsheet, SolStructPV builds a real 3D frame model of the installation:

Two rails per module column, positioned at 22% and 78% of the module width along the slope — the standard bearing points for a landscape or portrait module — rather than assuming a single centerline rail.

Rails carried on L-feet (standoffs) at every building purlin the rail crosses, not just at the array's structural frame lines. Each L-foot is modeled as its own member between the roof surface and the rail, so the load path from module to purlin is explicit, not assumed.

Every L-foot base is treated as fully fixed — pinned feet would let the rail roll under load — which reflects how these connections actually behave once bolted to a purlin flange.

The building's own purlins are drawn into the 3D view, the drawings, and the DXF for reference, even though they sit outside the analysis boundary — so the output speaks the same language as the roof it's landing on.

Built on the Same Verified Engine

The purlin-mounted type isn't a bolt-on afterthought — it runs through the same FEM solver, code-family logic, and regression testing as every other structure type in SolStructPV, including the multi-code support (EN, IS, ASCE, AS/NZS, GB, JIS, NBR, SANS, NBC/CSA) added across recent releases. It was validated in a 240-model fuzz run alongside the other structure types added in that release, across codes, layouts, base conditions and section sizes, with zero exceptions and zero non-finite results.

IST Solar Power Plant design software

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