In Suqian, the architectural drawings are designed according to the second-class seismic design. Is it necessary to carry out seismic detection after the reinforcement involved in the project comes into the site for inspection? All steel bars entering the site shall be tested. Is there any earthquake resistance in the steel bar inspection? The teacher didn't talk in class the other day. Specification requirements:

For structures with seismic fortification requirements, the performance of longitudinal reinforcement should meet the design requirements; When there are no specific requirements in the design, the longitudinal reinforcement in the frame and diagonal bracing members (including ladder sections) designed according to the first, second and third seismic grades shall be HRB335E, HRB400E, HRB500E, HRB335e, HRB400e or HRB500e, and the measured values of the maximum strength and total elongation shall meet the following requirements:

1 The ratio between the measured tensile strength and the measured yield strength of steel bars should not be less than1.25;

2. The ratio of the measured yield strength of steel bars to the standard yield strength should not be greater than1.30;

3. The total elongation of reinforcement under the maximum stress should not be less than 9%.

Inspection quantity: determined according to the purchase batch and product sampling inspection scheme.

Inspection method: check the re-inspection report on approach.

According to the newly promulgated national standards "Code for Design of Concrete Structures" GB 500 10 and "Code for Seismic Design of Buildings" GB 500 1 1, this article specifies the strength and elongation of longitudinal stressed steel bars in some frames and diagonal bracing members (including stairs) in order to ensure the seismic performance of important structural members. The ratio of measured tensile strength to measured yield strength in clause 1 of this article is customarily called "strong yield strength ratio" in engineering, the ratio of measured yield strength to standard yield strength in clause 2 is customarily called "super ratio" or "super yield strength ratio" in engineering, and the total elongation under maximum force in clause 3 is customarily called "uniform elongation".

Frames in this article include frame beams, frame columns, frame-supported beams, frame columns and slab-column columns in various concrete structures, and their seismic grade shall be determined by design according to the current national standards. Support members include outrigger trusses and stairs. The seismic grade of supporting members is not specified in relevant standards, and all supporting members shall meet the requirements of this article.

You can refer to the material-related contents in the Code for Acceptance of Construction Quality of Concrete Structure Engineering.