Some provisions for the assessment of seismic measures for the foundation structure of horizontal containers

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1. The fundamental structure of horizontal heat exchange equipment does not need to undergo seismic load capacity verification, but it must meet the corresponding seismic protection requirements. 2. When conducting seismic performance assessment of the existing foundation structure of horizontal containers, it is necessary to rely on the seismic design intensity and the relevant requirements in Chapter 4 of this standard, and pay special attention to examining the following aspects: (1) Site stability and the current condition of the foundation. (2) The actual concrete strength grade of the infrastructure. (3) At 8 degrees and 9 degrees, support-type reinforced concrete foundation structures such as T-shaped, II-shaped, or H-shaped structures shall be inspected in accordance with the relevant provisions of the standards. 3. The seismic design measures for the beams and columns of the braced foundation structure shall comply with the requirements for frame structures specified in Chapter 6 of this standard. The bracket for Class B equipment shall meet the requirements of a three-level frame structure. 4. The construction measures for the existing pier-type container foundation structure shall comply with the following provisions: (1) The diameter of the vertical reinforcement in the piers should not be less than 12 mm, and the spacing between them should not be greater than 200 mm ； Closed stirrups should be provided in the transverse direction; their diameter should not be less than 8 mm, and the spacing between them should not exceed 200 mm. (2) At a gradient of 9 degrees, the height of the pier-type foundation structure should not exceed 1.5 m. (3) The concrete strength grade of reinforced concrete foundation structures shall not be lower than C18, and the concrete strength grade of plain concrete foundation structures shall not be lower than C13. 5. At degrees 8 and 9, the seismic bearing capacity of the foundation structure for horizontal containers shall be checked; the basic combination of the standard value effects of seismic actions and other load effects can be determined in accordance with the relevant provisions of this standard, while the standard value of horizontal seismic actions can be calculated as specified in the codes. 6. For the damping ratio of horizontal vessel structures, 0.05 can be used.