Through the knowledge collation of the architectural knowledge column of this website, Zhong Da consulted and sorted out the basic situation of the technical specifications for bridge and culvert construction as follows:
Technical Specification for Bridge and Culvert Construction, namely Technical Specification for Highway Bridge and Culvert Construction, is a book published by People's Communications Press 20 1 1 and compiled by the First Highway Engineering Bureau of Luqiao Group.
The latest technical specifications for bridges and culverts are revised as follows:
1. It is clear that the highway bridge and culvert structure should be designed according to the limit state of bearing capacity and the limit state of normal use, and three design states of structural design are introduced: permanent state, transitional state and accident state.
2. Modify the combination mode and combination coefficient of action effects in the structural design of highway bridges and culverts, introduce short-term effect combination and long-term effect combination of actions, and put forward the frequency encounter value coefficient and quasi-permanent value coefficient of various variable short-term effect combinations;
3. This paper introduces the safety grade and its important coefficients of highway bridge and culvert design, and adopts different important coefficients according to the severity of possible consequences of bridge and culvert structural damage, so as to make the structural design more reasonable.
4. Carry out special research on the Classification Standard of Highway Bridges and Culverts, and adjust the classification standard of highway bridges and culverts appropriately according to the research results;
5. The paper makes a special study on the Standard of Frequency Deviation of Design Flood for Bridges and Culverts of Expressway and Class I Highway, analyzes and compares the relationship between the original standard and relevant standards at home and abroad, and compares the calculation and analysis methods of design flood. After comprehensive analysis and comparison, it is considered that the original standard can be maintained.
6. Cancel the original standard vehicle load grade, and adopt highway -I and highway -II standard vehicle loads instead, and cancel the check load of trailers and tracked vehicles. The influence of the check load is indirectly reflected in the vehicle load;
7. Change the calculation method of automobile impact coefficient with span as the main influencing factor to the calculation method with structural fundamental frequency as the main influencing factor;
8. Adjust the standard value of crowd load locally;
9. The calculation formula of load and its influence coefficient is adjusted, and the national basic wind speed map and the national meteorological station basic wind speed and pressure numerical table are given;
10, which supplements the calculation method and formula of ice pressure;
1 1, which improves the adjustment of temperature function, system temperature and temperature gradient curve;
12, which increases the calculation and design requirements of automobile impact load;
13, which supplements the regulations on the influence on navigable seagoing ships.
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