Plastic hinge relocation in exterior reinforced beam–column joint and compliance issues to seismic design guidelines—A review

2019 ◽  
Vol 21 (5) ◽  
pp. 1938-1958
Author(s):  
Olaniyi Arowojolu ◽  
Ahmed Ibrahim
Keyword(s):  
Seismic Design ◽  
Plastic Hinge ◽  
Design Guidelines ◽  
Column Joint

STUDY ON THE SEISMIC VULNERABILITY OF A VIADUCT SUBJECTED TO NEAR-FAULT GROUND MOTIONS

2019 ◽  
Vol 6 (1) ◽  
Author(s):  
Yong Li ◽  
Mengfei Xie ◽  
Lijun Meng
Keyword(s):  
Seismic Design ◽  
Seismic Vulnerability ◽  
Shear Failure ◽  
Ground Motions ◽  
Plastic Hinge ◽  
Design Guidelines ◽  
Severe Damage ◽  
Seismic Excitations ◽  
Near Fault ◽  
Bridge System

Piers, abutments and bearings of viaducts may suffer severe damage during earthquakes, so it's not insufficient to evaluate the seismic vulnerability of a bridge system only by plastic hinge curvature, which is adopted in seismic design guidelines. In this paper, the seismic vulnerability evaluation of a viaduct is conducted by incremental dynamic analysis under 30 near-fault ground motions, which are selected from PEER database. Then several damage measures are recommended to make an overall estimation for the seismic vulnerability of the viaduct, including plastic hinge curvature, shear failure and sliding displacement failure of bearings and pounding force between abutments and the girder. The analysis results show that the transversal seismic excitations may lead to more severe damage than the longitudinal ground motions. No matter in which direction the ground motions are inputted, the bearings' seismic vulnerability resulted by shear force or sliding displacement is higher than the plastic hinge of piers, which indicates that the seismic vulnerability of the bridge system is determined by the bearings to an extent. As a result, bearings should be designed according to both static and seismic analyses to guarantee the safety during earthquakes.

Performance-Based Analysis of Coupled Support Structures and Piping Systems Subject to Seismic Loading

2015 ◽  
Author(s):  
Oreste S. Bursi ◽  
Fabrizio Paolacci ◽  
Md Shahin Reza
Keyword(s):  
Seismic Design ◽  
Seismic Analysis ◽  
Design Method ◽  
Design Guidelines ◽  
Piping System ◽  
Support Structures ◽  
Limit States ◽  
Piping Systems ◽  
Allowable Stress Design

The prevailing lack of proper and uniform seismic design guidelines for piping systems impels designers to follow standards conceived for other structures, such as buildings. The modern performance-based design approach is yet to be widely adopted for piping systems, while the allowable stress design method is still the customary practice. This paper presents a performance-based seismic analysis of petrochemical piping systems coupled with support structures through a case study. We start with a concept of performance-based analysis, followed by establishing a link between limit states and earthquake levels, exemplifying Eurocode and Italian prescriptions. A brief critical review on seismic design criteria of piping, including interactions between piping and support, is offered thereafter. Finally, to illustrate actual applications of the performance-based analysis, non-linear analyses on a realistic petrochemical piping system is performed to assess its seismic performance.

Seismic Performance of Steel Beam-Column Joint under Low Cyclic Loading with Multiple Cycles

2013 ◽  
Vol 353-356 ◽  
pp. 2069-2072
Author(s):  
Hua Ma ◽  
Xue Wei Zhang ◽  
Zhen Bao Li ◽  
Wen Jing Wang ◽  
Fang Liang Zhang ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Seismic Performance ◽  
Mechanical Performance ◽  
Plastic Hinge ◽  
Cover Plate ◽  
Cycle Number ◽  
Skeleton Curve ◽  
Column Joint ◽  
Low Cyclic Loading ◽  
Steel Joints

An experiment of three T-shape beam-column steel joints with intensive cover plate was conducted under low cyclic loading with different cycle numbers, to study seismic performance of the joints subjected to long-period ground motions. Effects of cycle number on mechanical performance and length of plastic hinge were analyzed. The results show that as the cycle number increases, capacity of the joint decreases, and plastic hinge of the joint develops longer which appears closer to the cover plate, and the platform of skeleton curve grows longer, and the stiffness attenuates slightly.

scholarly journals Seismic design and behaviour of external reinforced concrete beam-column joints incorporating 500E grade steel reinforcing

2005 ◽  
Vol 38 (2) ◽  
pp. 73-86
Author(s):  
Leslie M. Megget
Keyword(s):  
Reinforced Concrete ◽  
Seismic Design ◽  
Concrete Beam ◽  
Plastic Hinge ◽  
Reinforced Concrete Beam ◽  
Hinge Zone ◽  
Farthest Point ◽  
Large Earthquakes ◽  
Current Standards ◽  
Grade Steel

Four external reinforced concrete beam-column sub-assemblages were tested under pseudo seismic cyclic loading. The approximately 2/3 scale units incorporated the new Grade 500E reinforcing steel as the beam bars. Two different forms of beam bar anchorage were tested, the normal 90-degree "standard hook" and the continuous U-bar detail. In all units the farthest point of the beam bar anchorage was positioned at the minimum limit prescribed in the NZ Concrete Standard (NZS3101), namely ¾ of the column depth from the inner column face. All 4 units formed plastic hinges in the beam and joint degradation was minor. Failure occurred at drift ratios between 4 and 6% (approximate ductility factors of between 4 and 6) predominantly due to buckling of the beam bars in the plastic hinge zone. The stiffness of these units was significantly less than similar units reinforced with 300E Grade reinforcing or the recently replaced 430 MPa reinforcement. The decreased stiffness will cause higher lateral drifts during large earthquakes, than those anticipated in current Standards.

scholarly journals Tests on structural concrete beam-column joints with intermediate column bars

1979 ◽  
Vol 12 (3) ◽  
pp. 189-203
Author(s):  
R. Park ◽  
Yeoh Sik Keong
Keyword(s):  
Cyclic Loading ◽  
Transverse Shear ◽  
Concrete Beam ◽  
Plastic Hinge ◽  
Seismic Loading ◽  
Shear Capacity ◽  
Neutral Axis ◽  
Structural Concrete ◽  
Intermediate Column ◽  
Column Joint

Three structural concrete interior beam-column joint units were tested. The beams were prestressed by tendons in the top and the bottom of the section but not at mid-depth. The columns were reinforced using Grade 380 longitudinal bars. Transverse shear reinforcement existed in all members and in the joint core. Static cyclic loading was applied to the units to simulate seismic loading. The presence of intermediate column bars was shown to significantly improve the shear capacity of the joint core, and the need for a relatively small neutral axis depth in the plastic hinge regions of beams for ductile behaviour was emphasized.

Sign in / Sign up

Export Citation Format

Share Document