| DC 欄位 |
值 |
語言 |
| DC.contributor | 土木工程學系 | zh_TW |
| DC.creator | 吳俊廣 | zh_TW |
| DC.creator | Jyun-Guang Wu | en_US |
| dc.date.accessioned | 2012-7-23T07:39:07Z | |
| dc.date.available | 2012-7-23T07:39:07Z | |
| dc.date.issued | 2012 | |
| dc.identifier.uri | http://ir.lib.ncu.edu.tw:88/thesis/view_etd.asp?URN=983202100 | |
| dc.contributor.department | 土木工程學系 | zh_TW |
| DC.description | 國立中央大學 | zh_TW |
| DC.description | National Central University | en_US |
| dc.description.abstract | 依據過去地震經驗發現橋梁常遭受嚴重之損害，而橋梁支承裝
置、橋柱之損壞與落橋所造成的損失更為嚴重，為模擬橋梁於強震中
極限破壞情形，本研究旨在開發新纖維元素模型(Fiber Element)建立橋
梁塑鉸處構件，模擬橋梁於強震中塑鉸產生之高度非線性行為。
本研究採用向量式有限元素(Vector Form Intrinsic Finite Element)
為結構動力分析方法，此方法適用於處理大變形、大變位、材料非線
性與剛體運動等問題。過去VFIFE 使用雙線性彈簧元素(Bilinear Spring)
模擬所有非線性行為，即構件受力達一定強度，全斷面降伏並同時進
入塑性行為，但是此行為並無法精準模擬真實斷面降伏時，斷面由外
至內依序降伏之實際情況。
為模擬斷面實際降伏情況， 本研究引入纖維元素方法(Fiber
Element Method) 取代雙線性彈簧元素(Bilinear Spring) ，以纖維元素的
應力應變數值計算準確模擬塑鉸欲達極限破壞之高度非線性行為，並
配合Newmark-β法增量迭代計算程序，更新纖維元素方法中桿件狀態
判定參數與斷面參數程序計算桿件內力，再經由算例分析，證實所發
展之新元素與新分析方法之正確性。
最後以一座三跨剛性支承簡支橋梁為目標，進行參數分析探討在
三種不同測站之強震下，橋墩柱底塑鉸分別使用纖維元素與雙線性彈
簧元素時，橋梁防止落
| zh_TW |
| dc.description.abstract | In the past extreme earthquake, observed from the damaged bridges,
bearing failure, column failure and deck unseating caused a more serious
loss. Therefore, it is full of curiosity that how large earthquake will cause a
bridge to collapse and how the ultimate state will be. This study is aimed to
develop the new model of Fiber Element in plastic hinge zone, and to
simulate high-degree nonlinear behavior of bridges by strong motion.
The Vector Form Intrinsic Finite Element (VFIFE), a new
computational method is adopted in this study because the VFIFE has the
superior in managing the engineering problems with material nonlinearity,
discontinuity, large deformation and arbitrary rigid body motions of
deformable bodies. In the past, VFIFE was used Bilinear Spring to analyze
all nonlinear behaviour. It means whole section is yielding and does the
plastic behaviour with the enough force. But this is not fit accurately with
the real condition of yielding section.
In order to analyze the real condition of the section, using stress-strain
relation to calculate and analyze the high-degree nonlinear behaviour with
ultimate-destroying of plastic hinge. Because of the formulation of
Newmark-β, it’s very important to renew the iteration type of Fiber
Element Method to calculate the element internal force. Through numerical
simulation of examples, the developed elements and analysis methods are
verified to be feasible and accurate.
Finally, we use many contact models in three elastic rods and analyze
an simple bridge to investigate the extreme functions of the columns and
unseating prevention devices between Fiber Element and Bilinear Spring,
and predicting the collapse situation of target bridge.
| en_US |
| DC.subject | 防落裝置 | zh_TW |
| DC.subject | 動力分析 | zh_TW |
| DC.subject | 向量式有限元素 | zh_TW |
| DC.subject | 纖維元素 | zh_TW |
| DC.subject | dynamic analysis | en_US |
| DC.subject | unseating prevention devices | en_US |
| DC.subject | Fiber Element | en_US |
| DC.subject | VFIFE | en_US |
| DC.title | 塑鉸極限破壞數值模型開發 | zh_TW |
| dc.language.iso | zh-TW | zh-TW |
| DC.title | Development of Hinges Ultimate-destroyed Model | en_US |
| DC.type | 博碩士論文 | zh_TW |
| DC.type | thesis | en_US |
| DC.publisher | National Central University | en_US |