A method for calculating the diameter of reinforcing bar required for reinforcing bar anchorage and an application method thereof

Abstract

The invention discloses a method for calculating the diameter of reinforcing bar required for reinforcing bar anchorage and an application method thereof. In the required steel bar diameter calculation method, the required steel bar diameter is the larger of the following two values: (1) the minimum structural diameter of the steel bar required by the industry design code; (2) When the actual reinforcement area of the longitudinal reinforcement is larger than the required reinforcement area, the diameter of the reinforcement required is equal to the square root of the ratio of the area of thereinforcement required to the area of the reinforcement actually disposed multiplied by the diameter of the reinforcement allocated, The diameter of the reinforcing bar required is denoted by the symbol dX, The formula for calculating the diameter dX of the reinforcing bar required is as follows: (shown in the description). the application method includes: determining that basic anchorage length,anchorage length, lap length, seismic anchorage length and seismic lap length of the tensioned steel bar. Thus, the anchorage structure with consistent safety and reliability can be designed, thus avoiding the waste of resources and reducing the manufacturing cost.

Description

technical field [0001] The invention relates to a calculation method for concrete structure design, in particular to a calculation method for steel bar diameter required for steel bar anchoring and an application method thereof. Background technique [0002] At present, the calculation method of the anchorage length and lap length of the steel bars in the design of concrete structures can refer to the provisions of "Specification for Design of Concrete GB50010-2010". [0003] The basic anchorage length of the steel bar refers to the anchorage length required for the steel bar to be subjected to a specific force in a specific concrete structural member, that is, the steel bar is not anchored to the required length when the steel bar is subjected to a specific force in a specific concrete structural member. Sliding damage will occur on the member, and the basic anchorage length is represented by the symbol (l ab ) represents, the basic anchorage length (l ab ) and the shape ...

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Problems solved by technology

[0023] 1. Since the failure of steel bars in engineering is directly related to the force of the steel bars, rather than directly related to the diameter of the steel bars, the current calculation method for the anchorage length of the steel bars is not perfect

[0024] 2. The correction coefficient of the anchorage length of the steel bar adopts a one-size-fits-all method, that is, the total correction coefficient cannot be less than 0.6, which is an unscientific method, because if the correction coefficients of 0.6 and 0.4 are both set to 0.6, the safety reliability (accident probability ) are not the same as

For example, in the case of the same concrete strength and the same components, a steel bar with a diameter of d = 22mm, its force is only 53%, its correction coefficient is 0.53 and the end is equipped with mechanical anchors. Since the total correction coefficient cannot be less than 0.6, the final correction The coefficient can only be 0.6; the other steel bar with a diameter of d=16mm has a force of 100%, and its end is mechanically anchored, and the correction coefficient is 0.6. The steel bar is 1.37 times longer, and the concrete-wrapped steel bar with a diameter of d=22mm has a larger surface area, and the pullout anchorage per unit length is higher than the anchorage force of a steel bar with a diameter of d=16mm. should be short, but the calculation result is opposite, so the safety and reliability of the two components designed with the current technology are not the same

If there are components with different safety and reliability standards in the same building, the safety performance of the building is determined by the lowest safety and reliability components, so that the components with high safety and reliability become a waste

[0025] (3) The design method of the anchorage or lap length of steel bars currently used was obtained by calculating and querying the anchorage length table by a simple method when computer technology was not popularized decades ago. Although this method can improve Design efficiency and production efficiency, but although the anchorage or lap length of steel bars designed in this way can ensure safety and reliability, it is easy to cause waste of materials

However, no one has designed and improved this

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