Noriyasu SHIMBO

Study on Beam-to-Column Connections of Steel Rigid-Frame Piers Using High Performance Steel

Takeshi Miyashita

The Nagoya Expressway Public Corporation plans to build new expressway entrances and exits using steel ramen piers in accordance with the traffic infrastructure development policy around Nagoya Station in the Linear Central Shinkansen Line development plan. However, conventional design methods are subject to severe restrictions, and there are problems with complexly shaped steel piers and thicker plates at the steel pier corner. Therefore, the applicability of high-performance steels to steel pier corner was confirmed through loading tests. On the other hand, high-performance steel has a very high yield ratio and low energy absorption capacity. Therefore, instead of using a homogeneous structure for the corner, the applicability of a hybrid structure combining common steel with high energy absorption capacity and high-performance steel was investigated.
Since the loading tests on steel pier corner was homogeneous structures using high-performance steel, the hybrid structure was verified by FEA. First, an analytical model was created to reproduce the experimental model, and the validity of the analysis was verified. The corner of the hybrid structure is then analyzed to grasp the structure strength, deformation etc. of the corner.
Loading tests were conducted to investigate the relationship between flange intersection strain and load-corner displacement at corner, and high-performance steel was confirmed that the yield load and maximum load were larger than conventional steel.
The validation of the reproduction analysis confirmed that the strain distribution could be reproduced in the elastic range, but issues remain regarding the load-corner displacement relationship after yielding. Therefore, in parallel with the verification of the validity in the plastic region, the analytical model for which the maximum load is currently obtained was made into a hybrid structure, and a comparison was made with a homogeneous analytical model to organize the advantages of the hybrid structure. As a result, it was confirmed that the hybrid structure is superior to the homogeneous structure in reducing the flange intersection strain and in the stress state of the flange and ribs.