Effect of Seismic Capacity Evaluation of Reinforced Concrete Structures Considering Different Stress-Strain Models for Confined Concrete
Date Issued
2007
Date
2007
Author(s)
Lin, Szu-Chi
DOI
zh-TW
Abstract
Recent researches found stirrup is very crucial to the ductility of whole structure because it offers the confined stress increasing the strength and the ability of deformation of concrete itself, and also improves the bending strength and ductility capacity of structure members. The main idea of this research is to analyse differences caused by different stress-strain models for confined concrete when evaluating seismic capacity, and find the simulation method more approach to actual situation for analysis of reinforced concrete structures.
Models of Mander and Kawashima along with others used to modify these two models are considered in this research of total five models. After acquiring relation of moment and curvature of desired cross sections by moment-curvature analysis, the plastic rotation capacity of each structure member can be available to set the hinge properties. Finally, by using pushover analysis with capacity spectrum method, the seismic capacity of structures can be calculated.
After these analyses, it is found that the major factor affecting seismic capacity is the ultimate strain of stress-strain curve of confined concrete. The difference between expectations from tops of models’ curves is not big enough to affect seismic capacity significantly. Results from models of 0.9Mander, Kawashima, and K_0.018 are more reasonable, but there are still many other details needed to be further analyzed.
Subjects
圍束混凝土
應力應變曲線
彎矩曲率曲線
側推分析
塑鉸性質
Mander
Kawashima
Confined Concrete
Stress-Strain Curve
Moment-Curvature Curve
Pushover Analysis
Hinge Property
Type
thesis
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