Pile Cap Design

Step 1: Design Data Input & Pile Coordinate Generation

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Material Properties

Concrete Strength (f'c) - ksi:

Steel Strength (fy) - ksi:

Reinforcing Cover - in:

Column Dimensions

Column X Dimension - ft:

Column Y Dimension - ft:

Eccentricity X - ft:

Eccentricity Y - ft:

Footing Properties

Footing Thickness - ft:

Pile Embedment - in:

Pile Overhang - in:

Site Conditions

Ground Elevation - ft:

Footing Top Elevation - ft:

Water Elevation - ft:

Soil Weight - ksf:

Pile Configuration

Number of Piles X:

Number of Piles Y:

X Spacing - ft:

Y Spacing - ft:

Pile Diameter - in:

Pile Capacity

Bearing Capacity - tons:

Side Friction - tons:

Compression Factor:

Uplift Factor:

Pile Tip Elevation - ft:

Boring Reference:

Phase 1 Complete!

Design parameters established and pile coordinates generated successfully.

Moving to Phase 2: Load Cases Input Section

Step 2: Load Cases Data Input

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Import from File

Paste from Excel/CSV:

Current Load Cases:

Load Case	Factor	Fx (k)	Fy (k)	Fz (k)	Mx (k-ft)	My (k-ft)	Actions

Data Summary:

Total Load Cases: 0 Max Fx: - Max Fy: - Max Fz: -

Phase 2 Ready!

Load cases configured successfully.

Moving to Phase 3: Pile Force Distribution Analysis

Step 3: Pile Force Distribution Analysis

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Pile Group Properties:

Force Distribution Table:

Pile Force Summary:

Pile No.	X (ft)	Y (ft)	Pmax (k)	Max LC	Pmin (k)	Min LC

Analysis Summary:

🎯 Interactive Pile Force Distribution Visualization

This interactive visualization displays the pile force distribution in a top view with beautiful hover effects and zoom capabilities. Each pile is color-coded based on its maximum force value.

Controls: Hover over piles for details, scroll to zoom, click and drag to pan, use Reset View to return to default.

Phase 3 Ready!

Force distribution analysis complete.

Next: Ready for Phase 4 - Structural Design Checks!

Step 4: Structural Design Calculations

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Factored Demands (from analysis)

One-Way Shear (per-ft strip)

V_u (kips/ft):

Use demand at a section located d_v from the face.

Punching (Two-Way) Shear

V_u (kips):

Demand on critical perimeter at d_v/2 from faces.

Flexure

M_u (kip-ft):

Provide governing factored moment for the design strip.

Pull Demands from Load Case

Select Source

Load Case:

Strip Direction:

Cap Dimensions (derived)

Cap Length (X):

—

Cap Width (Y):

—

Overhang (each side):

—

One-Way Shear Slicer (uses pile reactions from selected LC)

Slice Setup

Load Case:

Strip Direction:

Which side contributes:

Cut offset from column face (in):

Average both sides of the cut

Show column outline on canvas

Section is placed at d_v from the column face, plus optional offset. The shear is the sum of pile reactions on the chosen side of the cut. Per-ft demand divides by the section length.

Slice Result

Cut Location:

—

V_u (kips):

—

Section Length (ft):

—

V_u per-ft (kips/ft):

—

One-Way Shear Capacity Check

Shear Capacity Formulas (LRFD 5.8.3.3)

V_c1 = φ_v × 0.0316 × β × √f'_c × b_w × d_v

V_c2 = 0.25 × f'_c × b_w × d_v

V_n = min(V_c1, V_c2)

Where:

φ_v = 0.90 (strength reduction factor for shear)
β = 2.0 (per LRFD 5.8.3.4.1)
f'_c = concrete compressive strength (ksi)
b_w = footing width (ft)
d_v = effective shear depth (ft)

⚡ Two-Way Shear (Punching Shear) Check

Punching Shear Formulas (LRFD 5.13.3.6)

V_n1 = (0.063 + 0.126/β_c) × √f'_c × b₀ × d_v

V_n2 = 0.126 × √f'_c × b₀ × d_v

V_n = min(V_n1, V_n2)

Where:

β_c = 2.0 (ratio of long side to short side of pile)
b₀ = perimeter of critical section (in)
φV_n = φ × V_n (design shear capacity)

Flexural Moment Design

Flexural Design Formulas

M_u = P_u × d_crit

A_s = 0.85 × (f'_c/f_y) × b × d × [1 - √(1 - 4M_u/(1.7 × 0.9 × f'_c × b × d²))]

Where:

M_u = factored moment (kip-ft)
P_u = factored pile load (kips)
d_crit = critical section distance (ft)
A_s = required steel area (in²)
f_y = steel yield strength (ksi)

Interactive 3D Structure View

Step 1: Design Data Input & Pile Coordinate Generation

Material Properties

Column Dimensions

Footing Properties

Site Conditions

Pile Configuration

Pile Capacity

Phase 1 Complete!

Step 2: Load Cases Data Input

Paste from Excel/CSV:

Current Load Cases:

Data Summary:

Phase 2 Ready!

Step 3: Pile Force Distribution Analysis

Pile Group Properties:

Force Distribution Table:

Pile Force Summary:

Analysis Summary:

🎯 Interactive Pile Force Distribution Visualization

Phase 3 Ready!

Step 4: Structural Design Calculations

Factored Demands (from analysis)

One-Way Shear (per-ft strip)

Punching (Two-Way) Shear

Flexure

Pull Demands from Load Case

Select Source

Cap Dimensions (derived)

One-Way Shear Slicer (uses pile reactions from selected LC)

Slice Setup

Slice Result

One-Way Shear Capacity Check

Shear Capacity Formulas (LRFD 5.8.3.3)

One-Way Shear Results

⚡ Two-Way Shear (Punching Shear) Check

Punching Shear Formulas (LRFD 5.13.3.6)

Two-Way Shear Results

Flexural Moment Design

Flexural Design Formulas

Flexural Design Results

📋 Design Summary

Complete Design Summary