For coupled shear-wall spandrels acting as deep beams, why diagonal reinforcement trusses supersede slender beam assumptions?

Choices

• (A) Deep beams ignore shear design entirely
• (B) Diagonal compression struts and tensile chords form strut‑and‑tie load paths across deep coupling chords
• (C) Thermal blankets replace reinforcement
• (D) Bernoulli bending alone governs regardless of coupling depth