ASI - Structual Engineering Company ASI - Structual Analysis Software

Seismic Analysis

ASI has the capability to perform seismic analysis of structures using its Applied Element Method (AEM) based Extreme Loading® Technology.

In cases of extended structures, such as long bridges, the effects of sundry input excitations at different piers can be easily considered. Effects of an earthquake on utilites attached to structures such as power, gas and water lines can be studied by applying floor displacement as input excitation to such pipelines. Effects of earthquakes on furniture inside buildings, hanging and suspended objects, stacked barrels, and so forth can also be studied. Furthermore, unique material behavior or special dampers can  be taken into consideration as well.
 
Seismic Analysis Services Include:

  • Creating a 3D model for the “as-designed” structure based on the available design drawings.
  • Performing nonlinear static and dynamic analyses of the structure under the effect of the required cases of loading including seismic and wind loading.
  • Comparing the behavior of the “as-designed” structure with the “as-built” structure.
  • Checking stresses in all structural components.
  • Making recommendations for retrofit to prevent progressive collapse due to seismic activity.

Yanbu Gas Plant Construction Defect

Problem - During the construction process of a deethanizer vessel, several design mismatches between the anchor bolts and base plate holes were observed. To complete the installation process, the vendor widened and slotted nine holes in the base plate and removed three anchor bolts. In addition, several anchor bolts were damaged and several others were subjected to excessive heat during the torching/cutting of several bolts. This raised concern about its safety and structural integrity.

Analysis - ASI was tasked to provide a comparative model and analysis of the structure using our in-house structural analysis software, Extreme Loading® for Structures. The objective was to compare the as-designed case with the damaged as-built case with regard to wind and seismic loading.

Conclusion - ASI created a 3-D model and explicitly modeled all damaged portions and compared the behavior with the designed case. Based on the analysis, ASI was able to assure the client that the as-built structure met project level of safety requirements for design loading conditions.

 

Yanbu Gas Plant Construction Defect