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標題: | 考慮不同圍束混凝土組成律模式對於鋼筋混凝土結構物耐震能力之影響 Effect of Seismic Capacity Evaluation of Reinforced Concrete Structures Considering Different Stress-Strain Models for Confined Concrete |
作者: | Szu-Chi Lin 林斯頎 |
指導教授: | 蔡益超(I-Chau Tsai) |
關鍵字: | 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,Mander,Kawashima, |
出版年 : | 2007 |
學位: | 碩士 |
摘要: | 近年來研究發現箍筋對於結構物整體的韌性是非常重要的,因其提供了圍束力使混凝土本身之強度及變形能力提高,並增加構材的抗彎強度及韌性容量。本研究旨在探討不同圍束混凝土組成律模式對於耐震能力評估上所造成的差異,並找出對於鋼筋混凝土結構分析更趨近於實際情況之模擬方法。
本研究採用Mander模式與Kawashima模式二理論外,加上修改此二模式共進行五種模式的分析,對欲分析之各構材斷面以彎矩曲率分析求得彎矩與曲率之關係後,再求出各構材之塑性轉角容量以設定塑鉸,最後以容量震譜法進行側推分析,計算結構物之耐震能力。 經過分析後發現,影響耐震能力的主要因素為圍束混凝土應力應變曲線之極限應變,曲線最高點的預測其差距並沒有大到足以影響耐震能力很多,而0.9Mander、Kawashima、K_0.018模式的分析結果較為合理,但還有很多其他地方須要探討。 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. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/28704 |
全文授權: | 有償授權 |
顯示於系所單位: | 土木工程學系 |
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