Table 3 Stress influence law of pier on demolition construction of middle-span closure segment
Structural position of pier | Sid-span side | Mid-span side | ||
|---|---|---|---|---|
Influence law | Increase | Decrease | Increase | Decrease |
Self-weight | -5% | + 10% | -5% | + 10% |
Moment of inertia | / | / | / | / |
Effective prestress | 105% (2/3 h ~ h) | 75% (2/3 h ~ h) | 75% (2/3 h ~ h) | / |
Anchoring degree-prestress | 0% (1/2 h ~ h) | 100% (1/2 h ~ h) | 0% (1/2 h ~ h) | 100% (1/2 h ~ h) |
Modulus of Elasticity-C | / | / | / | / |
Modulus of Elasticity-Ps | -20% (3/5 h ~ h) | + 10% (3/5 h ~ h) | / | -20% (3/5 h ~ h) |
Temperature difference | -20℃ (3/5 h ~ h) | + 20℃ (3/5 h ~ h) | + 20℃ (3/5 h ~ h) | -20℃ (3/5 h ~ h) |