BuildX Load Generator

Wind Loads

Building Geometry

B = windward face width (normal to wind), L = depth (parallel to wind). Swap B/L and re-run for the orthogonal wind direction.

Mean roof height, h (m) Width normal to wind, B (m) Depth parallel to wind, L (m)

Location

Province, city, or municipality

Use a custom wind speed

Skips location lookup — enter any V (kph), same for every category

No location selected

Risk / Occupancy Category

NSCP 2015 §103 — determines wind map

Exposure Category

Terrain roughness upwind

Exp B

Urban / Suburban

Exp C

Open Terrain

Exp D

Flat / Water

Enclosure Classification

Determines internal pressure coefficient GCpi (NSCP Table 207A.11-1)

Enclosed

GCpi = ±0.18

Partially Enclosed

GCpi = ±0.55

Open

GCpi = 0

Topographic Effects (Kzt)

Wind speed-up over an isolated hill, ridge, or escarpment — NSCP 2015 §207A.8

Consider wind speed-up over hills or escarpment

Off = flat terrain, Kzt = 1.0

Kzt = 1.00 (flat terrain)

Result

Building Geometry

Regular-shaped rectangular building, per ASCE 7-10 §26.2 Low-Rise Building definition

Mean roof height, h (m) Least horizontal dimension (m) Other horizontal dimension (m) Roof angle, θ (deg)

Load case

Case A

Transverse (across ridge)

Case B

Longitudinal (along ridge)

Location

Province, city, or municipality

Use a custom wind speed

Skips location lookup — enter any V (kph), same for every category

No location selected

Risk / Occupancy Category

NSCP 2015 §103 — determines wind map

Exposure Category

Terrain roughness upwind

Exp B

Urban / Suburban

Exp C

Open Terrain

Exp D

Flat / Water

Enclosure Classification

Determines internal pressure coefficient GCpi (NSCP Table 207A.11-1)

Enclosed

GCpi = ±0.18

Partially Enclosed

GCpi = ±0.55

Open

GCpi = 0

Topographic Effects (Kzt)

Wind speed-up over an isolated hill, ridge, or escarpment — NSCP 2015 §207A.8

Consider wind speed-up over hills or escarpment

Off = flat terrain, Kzt = 1.0

Kzt = 1.00 (flat terrain)

Result

Structure Type

Matches STAAD's ASCE-7 Structure Type list

Solid Freestanding Sign / Billboard

Force-coefficient (Cf) method, ASCE 7-10 Ch. 29.3

Chimney / Tank / Similar Structure

Force-coefficient (Cf) method, ASCE 7-10 Ch. 29.4 — square, hexagonal/octagonal, or round cross-section

Open Sign / Lattice Framework / Trussed Tower

Not built yet — each has its own Cf table not yet digitized here

Structure Geometry

Fields change based on the type selected in Step 1

Clearance, ground to bottom of sign (m) Sign width, B (m) Sign height, s (m)

Location

Province, city, or municipality

Use a custom wind speed

Skips location lookup — enter any V (kph), same for every category

No location selected

Risk / Occupancy Category

NSCP 2015 §103 — determines wind map

Exposure Category

Terrain roughness upwind

Exp B

Urban / Suburban

Exp C

Open Terrain

Exp D

Flat / Water

Topographic Effects (Kzt)

Wind speed-up over an isolated hill, ridge, or escarpment — NSCP 2015 §207A.8

Consider wind speed-up over hills or escarpment

Off = flat terrain, Kzt = 1.0

Kzt = 1.00 (flat terrain)

Result

Element / Member

What is this wind pressure being applied to?

Purlin

Roof C&C member — outputs combined DL + Roof LL + WL line load

Truss / Girt

Larger tributary roof C&C member — reuses purlin reaction

Glass Facade / Curtain Wall

Wall C&C panel/mullion — pressure only, no DL/LL

Geometry & Loads

Fields change based on the element selected in Step 1

Wind pressure — required

Mean roof height, h (m) Purlin clear span (m) Purlin spacing (m)

Roof slope — sets slope band & roof LL pitch reduction

Roof rise (m) Roof run (m) Roof has eave/rake overhang

Dead load materials

Roof material Roof material thickness (mm) Insulation Insulation thickness (mm)

Zone reference — building footprint, used only to compute edge/corner zone width "a" (min of the two dimensions, per NSCP — not tied to purlin orientation). Doesn't change any pressure value; only tells you how far from the eave/corner Zone 2/3 extends, so you know which zone to apply to a given purlin's actual position

Building length (m) Building width (m)

Location

Province, city, or municipality

Use a custom wind speed

Skips location lookup — enter any V (kph), same for every category

Risk / Occupancy Category

NSCP 2015 §103 — determines wind map

Exposure Category

Terrain roughness upwind

Exp B

Urban / Suburban

Exp C

Open Terrain

Exp D

Flat / Water

Enclosure Classification

Determines internal pressure coefficient GCpi (NSCP Table 207A.11-1)

Enclosed

GCpi = ±0.18

Partially Enclosed

GCpi = ±0.55

Open

GCpi = 0

Topographic Effects (Kzt)

Wind speed-up over an isolated hill, ridge, or escarpment — NSCP 2015 §207A.8

Consider wind speed-up over hills or escarpment

Off = flat/gently-rolling terrain, Kzt = 1.0 (the default in STAAD and most projects)

Kzt = 1.00 (flat terrain)

Result

Diaphragm Loads

Diaphragm Inputs

Slab thickness (mm) Floor finish Floor finish thickness (mm) Floor fill / levelling layer Floor fill thickness (mm) Ceiling frame/suspension system Ceiling board/finish Board thickness (mm) Interior partition allowance

Interior partitions are a real floor dead load (the source LOADGEN spreadsheet's own floor take-off includes one) — this app previously omitted the term entirely. Choose "None" only if partitions are modelled explicitly as member loads.

MEPF allowance (kPa) Waterproofing (kPa)

Live Load Areas

NSCP 2015 Table 205-1 gives a different live load per occupancy/area type — add one row per area that needs its own LL (e.g. Basic floor area + Exterior balconies), each is reported as its own separate LL line, not summed together.

Beam depth (m) Concrete unit weight (kN/m³) Ground floor wall height (m) Upper floor wall height (m)

Custom Wall Load

Wall height, h (m) — any height

Leave at 0 to skip. Set any wall clear height to get 100/125/150mm CHB line loads for that height, e.g. a parapet or a non-standard-story wall not covered by the GF/tie-beam rows above.

Frame Wall Load (non-CHB)

Frame wall type Frame wall height (m)

For stud walls and clay brick wythes (NSCP TABLES "Frame Walls"). Leave the height at 0 to skip. Produces a member line load the same way the CHB rows do.

Result — STAAD Load Table

Seismic (NSCP 2015 §208)

Fixes 3 gaps vs. the original spreadsheet: R is looked up from structural system (not hand-entered), base shear V is actually computed, and the Zone-0.2 (Palawan/Sulu/Tawi-Tawi) Ca/Cv branch — previously dead code — now works correctly.

Seismic Inputs

Location (province / city search)

Occupancy / Risk category Structural system

Period parameter, Cₜ (Method A, §208.5.2.2)

Method A defines only three Cₜ values, and they don't map one-to-one onto every Table 208-11 row (a dual system can contain both an EBF and a steel SMRF). The auto value is a best-fit default — override it if your system says otherwise.

Building height (m) Soil profile type Seismic source type

Type A

High seismicity, high slip rate

Type B

Most other faults

Type C

Low seismicity/slip rate

Distance to seismic source (km) Total seismic weight W (kN) — example only, replace with your STAAD-computed value Reliability/redundancy factor, ρ (§208.6.1, Eq. 208-20)

ρ = 2 − 6.1/(r_max√A_B) depends on element-storey shear ratios that only come out of your lateral analysis, so this app cannot compute it — enter it, and it will be clamped to the code's limits (1.0–1.5; max 1.25 for special moment-resisting frames; forced to 1.0 in Zone 2 and for drift checks). E = ρE_h + E_v.

Result

Vertical Distribution of Base Shear (§208.5.5)

Distributes the base shear V above into storey forces ready to apply in STAAD: V = F_t + ΣF_i (Eq. 208-15), F_t = 0.07TV applied at the top level only when T > 0.7 s and capped at 0.25V (Eq. 208-16), F_x = (V − F_t)w_xh_x/Σw_ih_i (Eq. 208-17). Enter each level's seismic weight w_x and its height h_x above the base.

Sourcing: unlike the tables digitized from scanned NSCP pages elsewhere in this app, §208.5.5 had no scanned page available — these equations are corroborated against two independent references that quote NSCP 2015 §208.5.5 verbatim. Cross-check against your own NSCP copy before submitting a design.

Earthquake Recording Instrumentation (DPWH IRR, NSCP 2010 §105.2)

Reference checklist only — this app does not model building type, occupant load, bed/classroom count, or floor area, so applicability to your specific project is a manual check.

Minimum Instrument Specifications

Design Response Spectrum (NSCP 2015 §208.4.2)

From the Static (SLFP) tab

Max period to show, T (sec)

STAAD spectrum pairs (period, Sa)

In STAAD, define this as a User-Defined/Manual Response Spectrum load case and paste these Period–Sa pairs directly into it. This spectrum is elastic (not yet divided by R or multiplied by I) — use STAAD's own Scale Factor option on that load case to apply your project's I/R (Static tab, above) so the resulting member forces land at design level, then cross-check against the RSA/ELF scaling factor below.

RSA / ELF Base Shear Scaling Factor

Enter the base shears STAAD computed from your model — ELF (static, per the Seismic tab) and RSA (response spectrum analysis, using the spectrum pairs above as the elastic, un-reduced input spectrum).

ELF base shear, V_x (kN) RSA base shear, V_x (kN) ELF base shear, V_z (kN) RSA base shear, V_z (kN)

Result

Soil Spring Support (Winkler Foundation Stiffness)

Foundation spring stiffness for STAAD — not a seismic force procedure itself, so it applies the same regardless of whether you use Static or Response Spectrum above.

Allowable soil bearing capacity, qa (kPa) Factor of safety, FS Allowable deflection, δ (mm) Spring tributary width, w (m) Spring tributary length, l (m)

Result

Load Combinations (NSCP 2015 §203)

#	DL	LL	RLL	WL	EQ

Service (ASD)

#	DL	LL	RLL	WL	EQ	Note

Seismic Direction & Torsion Load Cases (NSCP 2015 §208.5 & §208.6.6)

Which set of EQ load cases to define in the analysis model depends on the project's own plan regularity — this is an engineering judgment call, not something this app can determine automatically. Pick the category below that matches the structure.

Wind Loads

Building Geometry

Location

Risk / Occupancy Category

Exposure Category

Enclosure Classification

Topographic Effects (Kzt)

Result

Building Geometry

Location

Risk / Occupancy Category

Exposure Category

Enclosure Classification

Topographic Effects (Kzt)

Result

Structure Type

Structure Geometry

Location

Risk / Occupancy Category

Exposure Category

Topographic Effects (Kzt)

Result

Element / Member

Geometry & Loads

Location

Risk / Occupancy Category

Exposure Category

Enclosure Classification

Topographic Effects (Kzt)

Result

Dead Load (DL)

Roof Live Load (LL)

Wind Load (WL)

Diaphragm Loads

Diaphragm Inputs

Live Load Areas

Custom Wall Load

Frame Wall Load (non-CHB)

Result — STAAD Load Table

Seismic (NSCP 2015 §208)

Seismic Inputs

Result

Vertical Distribution of Base Shear (§208.5.5)

Earthquake Recording Instrumentation (DPWH IRR, NSCP 2010 §105.2)

Design Response Spectrum (NSCP 2015 §208.4.2)

RSA / ELF Base Shear Scaling Factor

Result

Soil Spring Support (Winkler Foundation Stiffness)

Result

Load Combinations (NSCP 2015 §203)

Service (ASD)

Seismic Direction & Torsion Load Cases (NSCP 2015 §208.5 & §208.6.6)