A study on development and application of high performance steel for bridge structures

桥梁结构用高性能钢的开发与应用研究

基本信息

批准号：
08305014
负责人：
MIKI Chitoshi
金额：
$ 7.68万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
财政年份：
1996
资助国家：
日本
起止时间：
1996 至 1998
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08305014/
关键词：
High performance steel Fracture toughness Brittle fracture Fatigue behavior Low cvcle fatigue Large input heat welding High strength steel 破壊靭性 CTOD 脆化脆性亀裂繰返し塑性歪み破壊じん性隅角部シャルピー試験 CTOD試験

项目摘要

In this research project, the objective is to develop and apply high performance steel for bridge structures. The followings were studied.1) Deterioration of fracture toughness due to large plastic strain: Concerning the cold-worked bending process or huge earthquakes, the deterioration of fracture toughness due to large plastic strain was studied. In addition, the differences of effect between tensile plastic strain and compressive plastic strains were discussed with some kinds of steels by observation of brittle fractured surface and mechanical testing.2) Possibility of large input heat welding: Because of some negative effects, such as cracks or deterioration of properties and so on, generally, it has been prohibited to, apply the large input heat welding. In this research project, concerning the high performance steels, the applicability of large input heat welding was tested with carrying out the CTOD testing of large scale welded girder specimens.3) Fatigue Performance of High Strength Steel: For rationalization of steel bridges, fatigue performance of high strength steels was discussed with joint and large-scale girder specimens. In this study 900 MPa class steel, which has never used for actual bridges, was dealt with. In addition, improvement methods of fatigue strength were also studied.4) Low Cyclic Fatigue Behavior under Earthquake: Concerning the low cycle fatigue failure of steel pier under earthquake, low cyclic fatigue testing was carried out, and damage accumulation mechanism was studied5) Brittle Fracture of Beam-Column Joint: In order to improve the toughness and ductility of steel beam-column joint, cyclic loading testing was carried out and some retrofitting and improving techniques were also tested. In that testing, brittle fracture which initiated from that welded corner could be simulated experimentally. As a result, decreasing the strain concentration at the corner with corner rib was the most effective for prevention of brittle fracture.

在该研究项目中，目的是开发和将高性能钢用于桥梁结构。研究了以下内容。1）由于较大的塑料应变而导致断裂韧性的恶化：关于冷劳动弯曲过程或巨大的地震，研究了由于较大的塑性应变而导致的断裂韧性。此外，通过观察脆性骨折的表面和机械测试来讨论拉伸塑料应变和压缩塑料菌株之间的效果差异。2）大型输入热焊接的可能性：由于某些负面影响，例如裂缝或裂纹或脱落，通常会施加大量输入热量，以施加大量输入热量。在该研究项目中，关于高性能钢的适用性，通过进行大规模焊接梁标本的CTOD测试测试了大型输入热焊接的适用性。3）高强度钢的疲劳性能：用于钢桥的合理化，对高强度钢的疲劳性能，高强度钢的疲劳性能与关节和大型尺度吉尔师进行了讨论。在这项研究中，处理了900 MPA类钢，从未用于实际的桥梁。 4）地震下的疲劳强度改善方法。还测试了一些翻新和改进的技术。在该测试中，可以通过实验模拟从该焊接角开始的脆性断裂。结果，降低角肋骨处的应变浓度是预防脆性断裂的最有效的。