Detail of SH 3048-1999

Introduction of SH 3048-1999

1.0.1 This specification is applicable for seismic design of such steel facilities as vertical facilities, horizontal facilities, tanks, heating furnaces and so on in petrochemical enterprise where seismic fortification intensity is from six to nine degree. For facilities at the region where fortification intensity is 6, seismic checking computation can be ignored, but measures of seismic constitution should be adopted. 1.0.2 When facilities designed according to this specification subject to seismic action with fortification intensity of construction region, non-compression member of facility may be damaged. But it still can be used by general repair and even it need not to be repaired. 1.0.3 Seismic fortification intensity shall be ascertained according to the files (drawings) which are approved and issued in the light of authorities regulated by country. Generally, basic intensity can be used. For regions and enterprises where earthquake resistant plan and hazard resistant plan have been made, seismic fortification can be carried out according to approved fortification intensity or dynamic parameters of design earthquake. 1.0.4 When this specification is implemented, it also shall meet regulations of current compulsory standard specification concerned.

Contents of SH 3048-1999

1 General 2 Symbols and codes 3 Basic requirements of seismic design 4 Calculation of seismic action 41 General provisions 42 Ground response spectrum 43 Horizontal seismic action calculation of facilities on ground 44 Horizontal seismic action calculation of facilities on floors 45 Calculation of vertical seismic action 5 Horizontal facilities supported by double saddles 51 Calculation of natural vibration period 52 Calculation of seismic action 53 Intensity checking computation of anchor bolt 54 Calculation of overlapping horizontal facilities 6 Spherical tank 61 Calculation of natural vibration 62 Calculation of horizontal seismic action 7 Vertical barrel-type tank 71 Application scope 72 Calculation of natural vibration period 73 Calculation of horizontal seismic action and effect 74 Calculation of vertical stability allowable critical stress of tank wall 76 Calculation of wave height of liquid level generated by fluctuating 77 Measure of seismic constitution 8 Skirt type vertical facilities 81 General provisions 83 Calculation of horizontal seismic action 84 Vertical seismic action 85 Measure of seismic constitution 9 landing leg type (supporting) vertical facility 91 General provisions 93 Calculation of horizontal seismic action 94 Stability and shear checking computation of support 95 Intensity checking computation of anchor bolt 10 Heating furnace 101 General provisions 102 Calculation of natural vibration character 103 Calculation of horizontal seismic action and seismic checking computation 104 Measure of seismic constitution Checking computation of antivibration of tank wall Calculation of natural vibration characteristics Calculation of natural vibration period Appendix A Flexible matrix element Wording explanations for this code Clause Explanation