Compound Arch — Two Internal Hinges
Fixed-pin arch with two internal hinges, a 90 kN vertical crown load and a 40 kN horizontal side load; all four segments carry compression (arch action), and the fixed wall supplies a 120 kN·m moment reaction.
Category: frame · Difficulty: Expert
Solution
| Support | Rx (N) | Ry (N) | Mz (N·m) |
|---|---|---|---|
| A | -85 | 45 | -120 |
| D | 45 | 45 | 0 |
All reaction values are computed by the StatIQ structural engine, not generated text. Signs follow the solver's convention: a positive Ry acts upward, a negative Ry downward; a positive M is counter-clockwise.