wsbeng_dlg.dcl — Wall/Slab Bending Engineering

File: wsbeng_dlg.dcl
Version: v3.60
Category: Dialog Definitions
Size: 5.8 KB (175 lines)

Note

Wall and Slab Bending Analysis

Specialized engineering calculations for out-of-plane bending in walls (lateral loads) and slabs (gravity loads) with capacity verification.

Functional Purpose

Wall/Slab Bending Engineering - Calculates bending moments, deflections, and reinforcement requirements for walls under lateral loads and slabs under gravity loads.

Key Functions:

  1. Wall lateral load analysis (wind, seismic)

  2. Slab gravity load analysis (floor/roof loads)

  3. Moment calculations (simple span, continuous, fixed)

  4. Deflection checks (serviceability limits)

  5. Reinforcement optimization (minimum rebar for capacity)

User Need

  • Wall design (resist wind/seismic lateral loads)

  • Slab design (support floor/roof gravity loads)

  • Quick capacity verification (existing panels adequate?)

  • Optimization (reduce rebar while maintaining capacity)

Typical Workflow

1. User selects panel type: Wall OR Slab
2. User enters load case:
   • Wall: Wind 30 PSF lateral
   • Slab: 100 PSF gravity (dead + live)
3. User specifies support conditions:
   • Simple span
   • Continuous over supports
   • Fixed at base
4. System calculates:
   • Applied moments
   • Required reinforcement
   • Actual capacity with current rebar
   • Deflection (check L/360 limit)
5. Results displayed: OK or needs more reinforcement

Control Semantics

Panel Type:

  • ptype - Wall or Slab selection

Wall Analysis:

  • wload - Lateral load (PSF)

  • wsupp - Support: Simple, Continuous, Fixed base

  • wheight - Wall height (span)

Slab Analysis:

  • sload - Gravity load (PSF)

  • ssupp - Support: Simple, Continuous

  • sspan - Slab span length

Output:

  • moment - Applied moment

  • required_As - Required steel area

  • actual_As - Current reinforcement

  • ratio - Capacity/Demand

  • deflection - Calculated deflection

  • status - Pass/Fail

Engineering Calculations

Wall Bending (Lateral Load)

Simple Span Wall:

Given: 10' tall wall, 30 PSF wind
M = wL²/8 = 30 × 10²/8 = 375 lb-ft per foot width
M = 0.375 kip-ft/ft

Required As = M / (? × fy × 0.9d)
As = 0.375×12,000 / (0.9 × 60,000 × 0.9×5)
As = 0.19 in²/ft

Use #4 @ 12" o.c. (As = 0.20 in²/ft) ?

Slab Bending (Gravity Load)

Simple Span Slab:

Given: 20' span slab, 100 PSF load
M = wL²/8 = 100 × 20²/8 = 5,000 lb-ft per foot width
M = 5 kip-ft/ft

Required As = 0.42 in²/ft

Use #5 @ 9" o.c. (As = 0.41 in²/ft) ?

Integration

Called By: Engineering tools menu, quick check buttons Outputs: Engineering report, rebar recommendations

Documentation Metadata

Enhancement Status: ? COMPREHENSIVE - ENHANCED [3/23 v3.60 remaining]

End of Document