Static Seismic Loads and Seismic Wave Propagation

Property

Description

Horizontal Acceleration

Horizontal seismic acceleration for +X, -X, +Y, -Y axes in G units (1G = 9.81 m/s²)

Vertical Acceleration

Vertical seismic acceleration for +Z, -Z axes in G units (1G = 9.81 m/s²)

Load Type

Available analysis modes:

• OCC - Weight and seismic loads (W+P+Seismic) using allowable stresses for occasional loads
• ASCE 2001 (ALA) - Allowable strain calculated per ASCE 2001 (ALA) guidelines

• GB 50470 - Allowable strain calculated per GB 50470 code
• ASME B31E - Allowable stress calculated per ASME B31E code

Static method correction factor, SF

Multiplier for static equivalent accelerations. Recommended value: 1.3

Site Class

ASCE 7-22: Site classification per Section 20

Importance Factor, Ip

ASCE 7-22: Importance factor per Section 13.1.3

NSR-10: Section A.2.5.2

KBC 2016: Section 306.10.1.4

Importance Factor, IE

NBC 2020: Section 4.1.8.5

Pipe energy dissipation factor, Rp

NSR-10: Section A.9.4.9

Aa

NSR-10: Acceleration from seismic map

Component amplification factor, Ap

NSR-10: Component amplification factor per Table A.9.6-1

KBC 2016: Table 306.10.2

Response factor, Rp

KBC 2016: Table 306.10.1

NBC 2020: Table 4.1.8.18

Component amplification factor, Ar

NBC 2020: Table 4.1.8.18

Component factor, Cp

NBC 2020: Table 4.1.8.18

Te

CFE 2015: First mode period of piping system

Ar0

CFE 2015: Peak ground acceleration for rock soil (cm/s²)

Damping ratio,

CFE 2015: Damping ratio

Importance factor, ga

Eurocode 8 (EN 1998-1): Importance factor

Behavior factor, qa

Eurocode 8 (EN 1998-1): Behavior factor

Design Ground Acceleration, ag

Eurocode 8 (EN 1998-1): Design ground acceleration in G units

Region seismic activity

Construction region seismicity (7, 8, 9 points on MSK-64 scale)

Site seismic activity

Construction site seismicity (6, 7, 8, 9, 10 points)

Site soil category

Categories I, II, III per Table 1 SNIP II-7-81*, Table 1 SP 14.13330.2018, Appendix 1 NP-031-01

Vertical seismic acceleration factor Kv

Ratio of peak vertical to peak horizontal ground acceleration. Use seismic microzoning data or default value of 0.7. More...

Earthquake frequency

Per Table 17 SNIP II-7-81*, Table 16 SP 14.13330.2018

Piping seismic resistance category

Categories Is, IIs per Section 11.2.5 RD 10-249-98

K1 Factor

Range: 0.125-1.0 per Table 3 SNIP II-7-81*, Table 5 SP 14.13330.2018

• GOST R 55596-2013: 0.25

• SP 36.13330.2012: Category I - 0.625, II - 0.5, III - 0.25

• SNIP 2.05.06-85*: Category В - 0.625, I - 0.5, II, III, IV - 0.25

• RD 10-249-98: Category Is - 0.625, IIs - 0.5

• GOST 32388-2013: Critical pipelines - 0.625, standard pipelines - 0.25, others - 0.5

Alpha1

Horizontal seismic coefficient per Section 5.1.4 GB50011-2016

Perform buried pipeline seismic wave propagation analysis

Enable seismic wave propagation analysis for buried pipelines

Buried pipeline seismic analysis code

Select code for seismic axial strain calculation

Characteristic period of ground motion, Tg

Characteristic ground motion period for seismic wave length calculation. Default: 0.5 s