台灣累積絕對速度(CAV)地震危害度分析;CAV seismic hazard analysis for Taiwan

NCUIR > Engineering College > Graduate Institute of Civil Engineering > Electronic Thesis & Dissertation > Item 987654321/80116

Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/80116

Title:	台灣累積絕對速度(CAV)地震危害度分析;CAV seismic hazard analysis for Taiwan
Authors:	江沛恩;Chiang, Pei-En
Contributors:	土木工程學系
Keywords:	累積絕對速度;地震危害度分析;台灣;地震;CAV;Cumulative absolute velocity;seismic hazard analysis;Taiwan;PSHA
Date:	2019-07-24
Issue Date:	2019-09-03 12:10:53 (UTC+8)
Publisher:	國立中央大學
Abstract:	台灣位於環太平洋地震帶上，是典型的板塊碰撞而產生的大陸邊緣島嶼。受到歐亞大陸板塊及菲律賓海板塊相互碰撞的結果，台灣地區地殼變動及斷層活動十分頻繁，歷年來地震在台灣造成許多經濟損失及人員傷亡。因此，地震危害度分析對台灣來說更為重要，工程結構物需慎重考慮耐震因素，評估工址之地動特性為工程建設相當重要之課題。累積絕對速度(Cumulative absolute velocity, CAV)是一種相對較新的地振動強度測量值，考慮地動振幅、持續時間和波形，最近的研究顯示其比最大地動加速度(PGA)更能顯示結構物損壞程度。與以往以 PGA 為基準的地震危害度分析研究不同，本文提出了台灣首個以 CAV 為基準之地震危害度評估，以台灣 365 個鄉鎮區域點進行機率式地震危害度分析(Probabilistic Seismic Hazard Analysis, PSHA)，獲得不同 CAV 值的年發生頻率(annual rate)，並畫出 50 年內 2%及 10%超越機率之台灣 CAV 地震危害度地圖。結果顯示，相對於台灣其他地區，東部縱谷與西部麓山帶及平原區為兩大高 CAV 地震危害度區域，50 年內超越機率為 10%，CAV 危害度接近 1.6 g-s。北部的地震危害度由宜蘭向西北遞減，至桃園一帶最小，而南部地區 CAV 地震危害度則由台南麓山地帶向西南遞減，到高雄沿海地帶最小。最後，本研究提供了幾個設計地震的加速度時間歷時，其 CAV 和 PGA 接近計算的地震危害度，在未來 50 年內超越機率為 10%(再現週期為 475 年)。而此加速度時間歷時可用於台北地區基於性能的抗震設計中，確定結構振動特性並評估工程結構物之性能。;Taiwan is located in the Circum-Pacific seismic belt, typical continental edge islands produced by plate collisions. Earthquakes caused many economic losses and casualties. Thus, the seismic hazard analysis is important to Taiwan. Cumulative absolute velocity (CAV) is a relatively new ground motion intensity measure considering a motion’s amplitude, duration and waveform, which is considered more indicative of structure damage than PGA (peak ground acceleration). However, current seismic hazard assessments are still PGA-based. This study presents a new CAV-based seismic hazard assessment for Taiwan, and provides two CAV hazard maps in association with 2% and 10% occurrence probabilities in 50 years. The result shows that Central and Eastern Taiwan are subject to a greater CAV seismic hazard compared to the rest areas of Taiwan, and at the level of 10% occurrence probability in 50 years, the CAV hazard is close to 1.6 g-s. Based on the calculated PGA and CAV seismic hazards, this paper also presents four Design Earthquake (10% exceedance probabilities within the next 50 years, return period = 475 years) ground motions for structure performance-based design for Taipei areas, which is compulsory in Taiwan.
Appears in Collections:	[Graduate Institute of Civil Engineering] Electronic Thesis & Dissertation

Files in This Item:

File	Description	Size	Format
index.html		0Kb	HTML	150	View/Open

社群 sharing

Loading...