Table 2 Stress influence law of girder on demolition construction of middle-span closure segment
Structural position of girder | Top slab | Bottom slab | ||
|---|---|---|---|---|
Influence law | Increase | Decrease | Increase | Decrease |
Self-weight | + 10% | -5% | -5% | + 10% |
Moment of inertia | -15% | / | / | -15% |
Effective prestress | / | 75% | 75% (side span) | 75% (mid span) |
Anchoring degree-prestress | 100% (side span) | 100% (mid span) | 0% | 100% |
Modulus of Elasticity-C | / | / | / | / |
Modulus of Elasticity-Ps | + 10% | -20% | + 10% | -20% |
Temperature difference | + 20℃ | -20℃ | -20℃ | + 20℃ |