How to calculate earthquake force by hand
Publish: 2021-05-19 11:29:20
1. Earthquake load: (DI Zhen He Zai) earthquake load (seismic force)
also known as earthquake force. Inertial force, earth pressure and water pressure on structures e to earthquake. Since the horizontal vibration has the greatest influence on buildings, only the horizontal vibration is considered
calculation formula of seismic force: seismic force = self weight × Seismic coefficient
compared with steel-concrete structure, the self weight of all steel structure is lighter, which is about two-thirds or one-half of that of steel-concrete structure. According to the above calculation method, the steel structure building with light weight will greatly rece the seismic force, relieve the seismic force and protect the stability of the whole building.
also known as earthquake force. Inertial force, earth pressure and water pressure on structures e to earthquake. Since the horizontal vibration has the greatest influence on buildings, only the horizontal vibration is considered
calculation formula of seismic force: seismic force = self weight × Seismic coefficient
compared with steel-concrete structure, the self weight of all steel structure is lighter, which is about two-thirds or one-half of that of steel-concrete structure. According to the above calculation method, the steel structure building with light weight will greatly rece the seismic force, relieve the seismic force and protect the stability of the whole building.
2. Seismic force = self weight × Seismic coefficient
3. First of all, it should be clear that the bottom shear method is a simplification of the array decomposition response spectrum method, which regards the multi particle system as the equivalent single particle system. For the shear structure, only the first formation can be used. However, attention should be paid to the addition of horizontal seismic action in the final calculation.
4. Excerpts from two paragraphs in SATWE's manual, see pages 14 and 27
when changing the parameter of "angle between horizontal force and global coordinate", the direction of seismic action and wind load will change at the same time, so it is recommended to use this parameter only when changing the direction of wind load. At this time, if the direction of the main axis of the structure is inconsistent with the direction of the new coordinate system, the angle of the main axis of the structure should be filled in as the "oblique lateral force additional seismic direction" to consider the seismic action along the main axis of the structure
if the direction of wind load is not changed and only the seismic action of other angles is considered, the angle between horizontal force and global coordinate does not need to be changed, and only the additional seismic action direction is added
according to Article 5.1.1 of the code for seismic resistance, when the intersection angle of oblique lateral force resisting members is greater than 15 degrees, the horizontal seismic action in the direction of each lateral force resisting member shall be calculated respectively
therefore, to sum up, I don't think it is necessary to backfill -87.59 degrees. Fill in when the angle to the orthogonal direction is greater than 15 degrees.
when changing the parameter of "angle between horizontal force and global coordinate", the direction of seismic action and wind load will change at the same time, so it is recommended to use this parameter only when changing the direction of wind load. At this time, if the direction of the main axis of the structure is inconsistent with the direction of the new coordinate system, the angle of the main axis of the structure should be filled in as the "oblique lateral force additional seismic direction" to consider the seismic action along the main axis of the structure
if the direction of wind load is not changed and only the seismic action of other angles is considered, the angle between horizontal force and global coordinate does not need to be changed, and only the additional seismic action direction is added
according to Article 5.1.1 of the code for seismic resistance, when the intersection angle of oblique lateral force resisting members is greater than 15 degrees, the horizontal seismic action in the direction of each lateral force resisting member shall be calculated respectively
therefore, to sum up, I don't think it is necessary to backfill -87.59 degrees. Fill in when the angle to the orthogonal direction is greater than 15 degrees.
5. [structural designer]
6. Bottom shear method, mode decomposition response spectrum method
7. I don't know how to calculate the magnitude 0.3 earthquake by niuzhen power. Please ask experts to answer this question.
8.
Earthquake load: (dizhenhezai) earthquake load (seismic force)
also known as seismic force. Inertial force, earth pressure and water pressure on structures e to earthquake. Since the horizontal vibration has the greatest influence on buildings, only the horizontal vibration is considered
calculation formula of seismic force: seismic force = self weight × Seismic coefficient
compared with steel-concrete structure, all steel structure has the characteristics of light weight, and the weight of steel structure is generally about two-thirds or one-half of that of steel-concrete structure. According to the above calculation method, the steel structure building with light weight will greatly rece the seismic force, relieve the seismic force and protect the stability of the whole building< br />
9. Every magnitude of an earthquake increases energy by 30 times. The difference in destructive power between earthquakes of each magnitude can not be accurately measured at present, because the destructive power of each earthquake depends on its environment, geographical location, local social development and many other factors. According to the static theory, every magnitude of an earthquake increases energy by 30 times, A magnitude 8 earthquake is 30 times of a magnitude 7 earthquake and 900 times of a magnitude 5 earthquake
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