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意外偏心對鋼結構建築物耐震可靠度影響研究 = Accidental Ec...

國立高雄大學土木與環境工程學系碩士班

意外偏心對鋼結構建築物耐震可靠度影響研究 = Accidental Eccentricity Effect on Seismic Reliability of Steel Framed Buildings

紀錄類型:	書目-語言資料,印刷品 : 單行本
並列題名:	Accidental Eccentricity Effect on Seismic Reliability of Steel Framed Buildings
作者:	陳政宇,
其他團體作者:	國立高雄大學
出版地:	[高雄市]
出版者:	撰者;
出版年:	2008[民97]
面頁冊數:	125面圖，表 : 30公分;
標題:	意外偏心
標題:	Accidental eccentricity
電子資源:	http://handle.ncl.edu.tw/11296/ndltd/36061702466112669685
附註:	指導教授：張惠雲
附註:	參考書目：面35-41
附註:	附錄：1.結構構架系統設計；2.隨機意外偏心排列組合與抽樣；3.易損曲線之比較
摘要註:	偏心扭轉為地震下結構損害之重要因素。本研究依規範建議，將樓層質量從平面圖心上單軸偏移5%，以模擬實際活載分布與其關聯的意外偏心扭矩效應。滛進ㄧ步探討結構物受震反應，本研究採三種目前台灣常用之鋼結構系統，即抗彎矩構架(Moment Resisting Frames, MRF）、偏心斜撐構架（Eccentrically Braced Frames, EBF）和挫屈束制斜撐構架（Buckling Restrained Braces Frames, BRBF），建立六層樓及二十層樓辦公大樓結構模型，並藉由三維靜動態非線性結構分析程式，模擬分析各構架系統之受震反應。研究中使用八組實際地震加速度歷時記錄，來求取最大層間位移角與PGA之關係。之後，根據FEMA 356建議，採取最大層間位移角與，當作非結構材修復與生命安全界限，以建立結構易損性曲線。分析結果顯示，大地震作用下，低層樓結構物較高層樓結構物易受到損害。這與過去的經驗相符。本研究之主要結果如下：（1）分析結果顯示，當大地震發生時，低層樓鋼結構建築物較高層樓鋼結構建築物易受到較大的地震損害，這與過去的經驗相符。（2）忽略意外心扭矩效應影響，可能會高估鋼結構構架系統之耐震可靠度，導致不安全之評估結果。（3）根據規範建議以全層5% 質量偏心來考慮意外偏心扭矩的話，會低估鋼結構建築物耐震可靠度。（4）於低層樓結構物，使用EBF或BRBF構架系統，可有效地幫助降低地震損害。相較之下，高層樓結構物的耐震可靠度，受構架系統之影響較不顯著。 This paper investigates the role of accidental eccentricity in seismic reliability assessment. The analyzed structures are a 6-story and a 20-story steel moment resisting frames (MRFs), eccentrically braced frames (EBFs) and buckling restrained braced frames (BRBFs). The eccentricity in a floor plan was simulated by shifting the mass form the centroid by 5% of the dimension normal to earthquake shaking. The eccentricity along building heights was replicated by Latin hypercube sampling. The building responses were simulated via a 3D nonlinear time history analysis platform. All that allowed considering a more realistic distribution of live load mass and the associated accidental torsion effects. The fragilities for immediate occupancy and life safety were evaluated using 0.7% and 2.5% drift limits. Two limit-state probabilities and the corresponding earthquake intensities were further compared. The result of the comparison has shown a good agreement with past experience that low-rise buildings are more vulnerable to seismic damage. In addition, EBFs and BRBFs can significantly enhance the seismic performance for low-rise buildings, but may have limited effects on high-rise buildings. The result also suggested that accidental eccentricity might play a minor role in seismic reliability assessment. However, ignoring the effects could underestimate the fragilities for low-rise buildings. On the other hand, the code recommendation of 5% mass eccentricity in all floors may give conservative estimates, and the trend may increase in high-rise buildings and at large drift limits.

意外偏心對鋼結構建築物耐震可靠度影響研究 = Accidental Eccentricity Effect on Seismic Reliability of Steel Framed Buildings
陳, 政宇

意外偏心對鋼結構建築物耐震可靠度影響研究 = Accidental Eccentricity Effect on Seismic Reliability of Steel Framed Buildings / 陳政宇撰 - [高雄市] : 撰者, 2008[民97]. - 125面 ; 圖，表 ; 30公分.
指導教授：張惠雲參考書目：面35-41附錄：1.結構構架系統設計；2.隨機意外偏心排列組合與抽樣；3.易損曲線之比較.
意外偏心Accidental eccentricity

意外偏心對鋼結構建築物耐震可靠度影響研究 = Accidental Eccentricity Effect on Seismic Reliability of Steel Framed Buildings
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