Structural analysis

We are excel at analyzing detailed parts which cannot be explained by beam theory.
We can analyze complicated damaged part by our original know-how and help you to investigate the cause.

FEM analysis

FEM analysis is one of our strong point.
We use FEM analysis to uncover the pressure performance which is difficult to be explained by beam theory. Based on the analysis result, we draw up a plan for repairing work correspondent to the causes of damage.

Investigating the causes of damage is important to prevent another damage and to draw up an appropriate repairing plan.
However, it is difficult to identify the cause by analysis based on general beam theory.
TTES can solve this problem by means of detailed FEM analysis.

Especially for fatigue problem, we are excel at analyzing parts complicated in structure based on advanced technology and theory.
Depend on the result of investigation, we might suggest “not to repair”

Difference of precision between FEM and beam theory

A bridge is designed mainly based on beam theory, which is an excellent scheme as it is simple and easy to calculate, and the evaluation method of the result is established.

However, when you are investigating the cause of damage or planning how to repair it, it is too complicated to evaluate the damage only by beam theory.

The recent development of the computer and analytical technologies has made Finite Element Method (FEM) analysis easier to perform.
FEM is an analysis method which can be applied to any type of structure.
However, various know-how, such as subdivision method of the mesh and modeling method, is essential to perform high-precision analysis.

A large stock of our experience makes it possible to conduct precise analysis by FEM even if it is a complicated structure.

For example, the point such as a corner section and a steel plate deck where members are crossing is one of the points where beam theory cannot be applied.

‹Reference›

CAUSE STUDY ON FATIGUE DAMAGE IN ORTHOTROPIC STEEL BRIDGE DECK,
Proceedings of JSCE (780), 57-69, 2005-01-21
FATIGUE STRENGTH IMPROVEMENT OF BEAM-TO-COLUMN CONNECTIONS WITH BOX SECTION IN STEEL BRIDGE FRAME PIERS,
Proceedings of JSCE (773), 137-148, 2004-10-21
Cause identification of fatigue cracks in plate girder-on-steel frame pier bridge,
Proceedings of JSCE (758), 43-56, 2004-4-21