I need more clarification about what you mean by "LISP FOR STRUCTURE". Are you looking for:

• Implementation of data structures in LISP/Scheme?
• Converting existing code to LISP-style structures?
• Examples of data structures in LISP?
• Something else?

Please specify what you'd like help with regarding LISP and structures.

I need clarification about what you want to create for the rebar in the pile cap. Are you looking for:

1. A structural design calculation spreadsheet?
2. A drawing specification with rebar layout?
3. Code to automate rebar design calculations?
4. Something else?

Please specify the format and requirements for the pile cap rebar design.

I'll create a comprehensive drawing specification for rebar in a pile cap.

I'll create a detailed technical drawing specification for the pile cap reinforcement.

For a 1m x 2m pile cap, here's a typical rebar calculation:

Assumptions:

• Bar spacing: 150mm center-to-center
• Clear cover: 50mm (sides), 75mm (bottom)
• Bar size: T16 (16mm diameter)

X-direction (2000mm length):

• Effective length: 2000 - 2×50 = 1900mm
• Number of bars: 1900 ÷ 150 + 1 = 13 bars

Y-direction (1000mm width):

• Effective length: 1000 - 2×50 = 900mm
• Number of bars: 900 ÷ 150 + 1 = 7 bars

Total rebar: 13 + 7 = 20 bars

Typical layout:

• Bottom mat: 20 bars (13T16 + 7T16)
• Top mat: 20 bars (13T16 + 7T16)
• Vertical ties: 4-6 bars per pile
• Total: ~40-50 bars depending on pile configuration

For comparison:

• @100mm spacing: ~35 bars each direction
• @200mm spacing: ~15 bars each direction

The exact number depends on your specific design requirements and pile layout.