Highway Bridge and Culvert Design General Specifications JTG D60-2004

Author: China Road and Bridge Research Institute (Editor-in-Chief)
Publisher:
Publish Date: 2004-10-01
Features: This specification has been revised, incorporating the development and requirements of highway bridges in China over the past decade, resulting in a relatively comprehensive improvement over the original specification. The main revisions include:
1. Clarified that highway bridge and culvert structures should be designed for both ultimate limit states and serviceability limit states, introducing three design conditions for structural design: permanent, temporary, and accidental conditions.
2. Modified the combination methods and coefficients for action effects in highway bridge and culvert structure design, introducing short-term and long-term effect combinations of actions. Coefficients for frequent values in short-term effect combinations and quasi-permanent values in long-term effect combinations have been proposed.
3. Introduced the safety level and importance coefficient for highway bridge and culvert design, using different importance coefficients based on the severity of potential consequences of structural failure, making the design more rational.
4. Conducted a special study on "Classification Standards for Highway Bridges and Culverts," adjusting the classification standards based on research findings.
5. Conducted a special study on "Hydrological Frequency Standards for Highway Bridge and Culvert Design on Expressways and First-Class Highways." After analyzing and comparing the original standard with relevant domestic and international standards, as well as evaluating calculation methods for design floods, it was concluded that the original specification's provisions could be maintained.
6. Replaced the original vehicle load classification with the Highway-I and Highway-II vehicle load standards, eliminating the need for trailer and tracked vehicle load verification, with the impact of verification loads indirectly reflected in the vehicle load.
7. Changed the calculation method for the vehicle impact coefficient, now primarily based on the structural fundamental frequency instead of span length.
8. Made localized adjustments to the standard values for pedestrian load.
9. Adjusted the calculation formulas for loads and their influencing coefficients, providing a national basic wind speed map and a table of basic wind and wind pressure values for meteorological stations across the country.
10. Added calculation methods and formulas for ice pressure.
11. Improved the provisions for temperature effects, refined the system temperature specifications, and adjusted the temperature gradient curve provisions.
12. Added calculations and design requirements for vehicle impact loads.
13. Supplemented provisions for the impact of seagoing vessel collisions.