Seismic Isolator HDRB
Design, optimization and verification of circular HDRB seismic isolatorsSoftware for the design and verification of circular HDRB (High Damping Rubber Bearing) seismic isolators to EN 15129, EN 1337-3 and NTC 2018. The built-in optimizer automatically searches for the smallest-diameter isolator geometry that satisfies every check, while still delivering the stiffness and damping the designer requires. Checks are summarized with bar charts and reported in a detailed calculation report with formulas, results and comparison against the code limits. The isolator's technical drawing updates in real time as parameters change, while the F-Δ hysteretic diagram shows the force-displacement loop and the energy dissipated per cycle.
- Checks aligned with EN 15129, EN 1337-3 and NTC 2018, for circular isolators
- Automatic geometry optimization (diameter, layer thicknesses, compound) at a target equivalent stiffness
- Full calculation report: formula, values and limit comparison for every check
- Section technical drawing, updated in real time as parameters change
- Hysteretic F-Δ diagram with energy dissipated per cycle
- Three compressibility modulus (Ec) formulations compared side by side (EN 15129, EN 1337-3, NTC)
- Real-time utilization bars on the governing checks
The isolator's equivalent horizontal stiffness is Ke = Gdin·A / te, where Gdin is the compound's dynamic shear modulus, A is the isolator area and te is the total vulcanized rubber thickness: a softer compound or a thicker rubber layer lowers Ke, lengthens the isolated period and reduces the seismic forces transmitted to the structure.