Study on Seismic Evaluation Method of Geometrically Eccentric Reinforced Concrete Structure with Torsional Plastic Hinge
Date Issued
2010
Date
2010
Author(s)
Sun, Chi-Hsiang
Abstract
Seismic performance of existing school buildings may not be sufficient from the approach of updated codes. Development of evaluation techniques becomes very important. The criteria to investigate seismic behavior of building are suitable for structures with ductile design. Therefore, they may not be valid for the existing school buildings. In this thesis, the criteria for the prediction of soft story, weak story, strong-column-weak-beam, column failure mode and joint failure for existing school buildings are studied based on experimental data. The criteria for the prediction of strong-column-weak-beam and joint failure are modified so that they are more logical and consistent with the experimental results.
The methods of pushover analyses are still not suitable for the seismic evaluation of eccentric structures. This study is to develop the torsional plastic hinges for the structural members to simulate the torque behavior. First, the torque-twist relationship is established. The cracking torque and ultimate torque strengths are computed according to ACI 318-95 and reasonable reduction in torque strengths is proposed under combination loads. Cracking and ultimate torsional rigidities originated by Hsu is adopted. They are reasonable and conservative when compared with experimental results. Torsional plastic hinge is established according to the torque-twist relationship. Experimental results of beams under combined loads of bending, shear and torsion are verified. The pushover analysis curves agree with the experimental ones. In pushover analysis of a pure frame specimen, torsional effect becomes more obvious when the number of stories increases. With the addition of torsional plastic hinge, the pushover analysis of an L-shape school building is more reasonable and overestimation of the seismic capacity of the school building can be avoided.
Subjects
seismic evaluation
eccentric structure
torque-twist relationship
torsional plastic hinge
Type
thesis
File(s)![Thumbnail Image]()
Loading...
Name
ntu-99-R97521240-1.pdf
Size
23.32 KB
Format
Adobe PDF
Checksum
(MD5):772f85853753647a988fc968010565c9