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 -
