Inelastic seismic design verification method for steel bridge piers using a damage index based hysteretic model

1998 ◽  
Vol 20 (4-6) ◽  
pp. 472-480 ◽  
Author(s):  
Tsutomu Usami ◽  
Satish Kumar
Keyword(s):  
Seismic Design ◽  
Damage Index ◽  
Bridge Piers ◽  
Steel Bridge ◽  
Design Verification ◽  
Hysteretic Model ◽  
Verification Method

scholarly journals Applicability on dynamicc verification method for seismic design of steel bridge piers.

2002 ◽  
pp. 181-190
Author(s):  
Kunihiro MORISHITA ◽  
Tsutomu USAMI ◽  
Takahito BANNO ◽  
Akira KASAI
Keyword(s):  
Seismic Design ◽  
Bridge Piers ◽  
Steel Bridge ◽  
Verification Method

scholarly journals PREDICTION OF ULTRALOW CYCLE FATIGUE DAMAGE OF THIN-WALLED STEEL BRIDGE PIERS

2021 ◽  
Keyword(s):  
Cyclic Loading ◽  
Base Metal ◽  
Structural Parameters ◽  
Damage Index ◽  
Bridge Piers ◽  
Steel Bridge ◽  
Cycle Fatigue ◽  
Damage Level ◽  
Deposited Metal ◽  
Thin Walled

Ultralow cycle fatigue (ULCF) failure was first observed on steel bridge piers in the Kobe earthquake, and the ultimate strength and ductility evaluation formulas of thin-walled steel bridge piers were established. In this study, parametric analysis of steel piers was carried out to study the influence of the structural parameters on the ULCF damage evolution. The evolution of the ULCF damage of the base metal, the deposited metal, and the heat-affected zones was studied based on two types of steel piers with hollow box and pipe sections. Then, practical formulas to predict the ULCF damage level of steel piers under cyclic loading were proposed. Finally, the proposed formulas were validated by comparisons with the experimental results. The results show that the heat-affected zone is more vulnerable to ULCF failure than the base metal and the deposited metal. Moreover, the practical formulas to predict the ULCF damage index of the steel piers under cyclic loading were proposed, and the formulas effectively predicted the ULCF crack of the steel piers.

RECENT RESEARCH DEVELOPMENTS IN DUCTILE FRACTURE OF STEEL BRIDGE STRUCTURES

2013 ◽  
Vol 07 (03) ◽  
pp. 1350021 ◽  
Author(s):  
HANBIN GE ◽  
LAN KANG ◽  
KEI HAYAMI
Keyword(s):  
Ductile Fracture ◽  
Seismic Design ◽  
Fracture Behavior ◽  
Damage Index ◽  
Evaluation Methods ◽  
Steel Bridge ◽  
Loading History ◽  
Section Shape ◽  
Weld Defect ◽  
Bridge Structures

Results from 23 cyclic tests, including 18 cantilever-typed steel bridge piers and five beam-to-column connections, are presented to investigate their ductile fracture behavior as related to the seismic design of steel bridge structures, and based on shell and fiber models, two evaluation methods of ductile crack initiation are proposed. The effect of various parameters, including plate width-thickness and column slenderness ratios, cross-section shape, loading history, repeated earthquakes and initial weld defect is investigated experimentally. Among these parameters, width-thickness ratio, loading history and initial weld defect are shown to have significant influence on ductile fracture behavior. The test data suggest that for unstiffened box specimens, current seismic design provision limits on ultimate strain may not provide sufficient ductility for seismic design. On the other hand, based on the experimental results, two damage index-based evaluation methods respectively using shell model and fiber model are successfully employed to predict ductile fracture of steel bridge structures. Comparisons between experimental and analytical results show that they can predict ductile fracture behavior with good accuracy across the specimen geometries, steel types, loading histories and initial weld defects.

scholarly journals Experimental Study on the Behavior of Existing Reinforced Concrete Multi-Column Piers under Earthquake Loading

2021 ◽  
Vol 11 (6) ◽  
pp. 2652
Author(s):  
Jung Han Kim ◽  
Ick-Hyun Kim ◽  
Jin Ho Lee
Keyword(s):  
Seismic Performance ◽  
Seismic Design ◽  
Bridge Piers ◽  
Scale Model ◽  
Inertia Force ◽  
Small Scale ◽  
Lap Splice ◽  
Existing Structures ◽  
Seismic Design Code ◽  
Seismic Force

When a seismic force acts on bridges, the pier can be damaged by the horizontal inertia force of the superstructure. To prevent this failure, criteria for seismic reinforcement details have been developed in many design codes. However, in moderate seismicity regions, many existing bridges were constructed without considering seismic detail because the detailed seismic design code was only applied recently. These existing structures should be retrofitted by evaluating their seismic performance. Even if the seismic design criteria are not applied, it cannot be concluded that the structure does not have adequate seismic performance. In particular, the performance of a lap-spliced reinforcement bar at a construction joint applied by past practices cannot be easily evaluated analytically. Therefore, experimental tests on the bridge piers considering a non-seismic detail of existing structures need to be performed to evaluate the seismic performance. For this reason, six small scale specimens according to existing bridge piers were constructed and seismic performances were evaluated experimentally. The three types of reinforcement detail were adjusted, including a lap-splice for construction joints. Quasi-static loading tests were performed for three types of scale model with two-column piers in both the longitudinal and transverse directions. From the test results, the effect on the failure mechanism of the lap-splice and transverse reinforcement ratio were investigated. The difference in failure characteristics according to the loading direction was investigated by the location of plastic hinges. Finally, the seismic capacity related to the displacement ductility factor and the absorbed energy by hysteresis behavior for each test were obtained and discussed.

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