Computer Modeling

Our company adpots Sap 2000 to analyze the structural dynamic vibration responses. To satisfy the dynamic vibration criteria for different usages, proper structural design is important for sensitive building (e.g. hospital) to resist the internal vibration sources (e.g. human walking, machine etc.) and external vibration sources (e.g construction, traffic etc.). Our team has proven experience and expertise on the analysis of structural dynamic vibration.

The work flow of Computer Modeling begins with geometrical model preparation, follow by meshing, solving, and post-processing.

1.Finite Element Meshing

Hosiptal3

2.Structural Element Meshing

frame2

3.Modal analysis

The most important part of vibration analysis is to identify the natural frequency and mode shape of the structure.

Mode_Shape1Mode_Shape2

Mode_Shape3Mode_Shape4
4.Construction Vibration

Adjacent construction activities such as piling can induce vibration on each floor.

Construction_vib

5.Human Walking

Human walking inside a building can induce significant vibration response in the structure. This may correspond to the design of fewer columns to have more free space in the modern structure. When there is a crowd of people walking, significant vibration in the structure may be induced (crowd effect).

HUMAN_WALK1HUMAN_WALK2

6.Machine Vibration

Machine in the room of Air Handling Unit (AHU) can induce vibration in the structure. The adjacent sensitive rooms may be affected.

Machine1Machine2

7.Data analysis

The vibration responses (Time history and Power Spectral Density) in the sensitive rooms will be analyzed in detailed.

 

Time History

Time History Analysis

PSD

Power Spectral Density

 

Example for fundamental vertical global mode

For a typical 5 x 5 bays, 10-storey building, the vibration mode shape is in both horizontal and vertical directions. At a certain frequency, the whole building vibrates in vertical direction with the column movement.

5x5_ext

Should you have any questions, please contact us at 3586 1826.