1.0.1 This specification was specially compiled in purpose of make the wind-resistent design of bridges especially the large-span and soft bridge structures be safe, reliable, state-of-art technology, economic and feasible.
1.0.2 This specification is applicable to the stayed-cable bridges with main span less than 800m and the suspension bridges with main span less than 1500m, and the wind-resistent design of other types of bridge structures may also be implemented by making reference thereto.
1.0.3 The wind-resistent design shall comply with the following principles:
1 Within the working life of bridge design, the structure shall not occur with devastating self-excited diffused vibration when the area where the bridge site is appears with maximum wind speed.
2 With design wind loading and other actions, the structure shall be with specified strength and rigidity and shall not occur with static instability.
3 The amplitude of nondestructive wind-induced vibration of bridge structures shall meet the requirements on traffic safety, structural fatigue and traveling comfortableness.
4 The wind-resistent capacity of bridge structure may be improved through pneumatic measures, structural measures and machinery measures.
1.0.4 The tunnel test is one important method to carry out the wind-resistent design of bridge structure.
1.0.5 The wind-resistent design of highway bridge shall not only comply with this specification, but also shall comply with those specified in relevant national compulsory standards.
1 General Provisions - 1 -
2 Terms and Symbols - 1 -
2.1 Terms - 1 -
2.2 Symbols - 3 -
3 Calculation of Wind Speed - 4 -
3.1 Basic Wind Speed - 4 -
3.2 Design standard wind speed - 4 -
3.3 Design Wind Speed at Construction Phase - 7 -
4 Wind Load - 8 -
4.1 General Provisions - 8 -
4.2 Wind Speed of Static Gust - 8 -
4.3 Static Gust Load on Main Beam - 8 -
4.4 Wind Load on Pier, Tower, Hanger Rod, Inclined Bracing Cable and Main Hauling Line - 10 -
4.5 Wind Load at Construction Phase - 12 -
5 Dynamic Property of Bridge - 13 -
5.1 General Provisions - 13 -
5.2 Estimation of the Fundamental Frequency of Stayed-cable Bridge - 13 -
5.3 Estimation of the Fundamental Frequency of Suspension Bridge - 13 -
5.4 Damping Ratio of Bridge Structure - 14 -
6 Recalculation of Wind-resistent Stability - 16 -
6.1 Recalculation of Statical Stability - 16 -
6.2 Recalculation of Galloping Stability - 17 -
6.3 Recalculation of Flutter Stability - 18 -
6.4Wind-resistent Stability Checking in Construction Phase - 20 -
7 Wind-reduced Amplitude-limited Vibration - 21 -
7.1 Buffeting - 21 -
7.2 Vortex Resonance - 21 -
7.3 Vibration on Stay Cable - 23 -
8 Wind-induced Vibration Control - 24 -
8.1 General Provisions - 24 -
8.2 Main Beam - 24 -
8.3 Bridge Tower and Bridge Pier - 24 -
8.4 Stay Cable and Hanger Rod - 24 -
9 Tunnel Test - 26 -
Annex A Distribution Map of Nationwide Basic Wind Speed Value and Basic Wind Speed - 27 -
Annex B Requirements of Tunnel Test - 43 -
B.1 General Provisions - 43 -
B.2 Aerostatic Force Test - 45 -
B.3 Sectional Model Testing - 45 -
B.4 Model Test of Bridge Tower - 46 -
B.5 Full Aeroelastic Model Testing - 46 -
Wording Explanation in this Specification - 48 -
