Title

考量等效沖刷載重之橋梁可靠度設計方法研究

Translated Titles

Study on the Methodology for Reliability-based Bridge Design Considering the Equivalent Scour Load

DOI

10.6342/NTU.2014.01696

Authors

陳志豪

Key Words

橋梁沖刷 ; 等效沖刷作用載重 ; 易損性曲線 ; Bridge scour ; equivalent scour load ; fragility curve

PublicationName

臺灣大學土木工程學研究所學位論文

Volume or Term/Year and Month of Publication

2014年

Academic Degree Category

碩士

Advisor

張國鎮

Content Language

繁體中文

Chinese Abstract

台灣地理上因板塊擠壓而造成高山林立,河流坡短流急,又因梅雨及颱風等天候影響,年降雨量大,造成雨季時河川流量暴增,因此造成台灣的橋梁沖刷問題非常嚴重。由於台灣西部都市之間交通依賴跨河橋梁聯繫,而跨河橋梁受損也將造成人命及財產的損失。考量現行橋梁設計規範當中,並無法完整考慮橋梁受到沖刷時之安全性,故針對受沖刷橋梁進行研究,以理論方式計算樁基礎橋梁受沖刷後破壞機率,以期將沖刷效應考慮進橋梁設計中。 本研究以文獻中之等效載重概念為主,以不同沖刷深度下之承載力損失量,將沖刷深度轉換為作用於基礎上之等效沖刷作用載重。為了驗證理論,利用樁基礎橋墩靜力承載試驗方式,找出樁基礎於不同埋置深度下之側推承載力,並計算其沖刷前後承載力之差值,並以此試驗結果重新推導等效沖刷作用載重公式。利用修正後之等效沖刷作用載重公式,提出以條件機率之方式,配合研究中定義之可接受破壞因子,計算橋梁樁基礎之側向不穩定性破壞機率。藉由計算不同沖刷深度下的破壞機率,進一步以理論方式建置沖刷易損性曲線。此外,利用橋梁破壞機率計算方法,結合災害分析及統計資料,則可將沖刷效應發展至橋梁設計規範中,故提出考量沖刷效應下橋梁設計的方法,提供未來於可靠度分析與設計時參考。

English Abstract

Taiwan is located in a convergent plate boundary. As a consequence, more than two-thirds of this island are rugged mountains, which caused the rivers are steep and have rapid currents. Also, mainly caused by typhoons and the plum rain season, the amount of precipitation is more than 2500mm in Taiwan. These factors result in severe scour problems for cross-water bridges. As the current AASHTO-LRFD bridge design codes did not consider scour effect in the design procedure, the current codes cannot ensure the safety of bridges under scour along with other hazard events. This study proposed a procedure to evaluate the failure probability of bridges with pile foundations under scour event. Equivalent scour load is used to transfer the scour depth into a load form. By using a series of experimental single-pile bridge lateral loading test, the relation between the reduction of resistance of the bridge pier and the corresponding scour depth is obtained. The revised equivalent scour load formula which can be used for the bridge failure probability estimation is proposed. Also, the scour fragility curves which are related to the flume test result are established. A methodology for bridge design considering scour is also proposed in this study, which could be a reference for the following research on bridge scour issue.

Topic Category 工學院 > 土木工程學研究所
工程學 > 土木與建築工程
Reference
  1. [1] American Association of State Highway and Transportation Officials. “AASHTO LRFD Bridge Design Specifications, Fifth Edition” 2010.
    連結:
  2. [3] Zach Liang, and George C. Lee. “Bridge Pier Failure Probabilities under Combined Hazard Effects of Scour, Truck and Earthquake. Part I: Occurrence Probabilities” Journal of Earthquake Engineering and Engineering Vibration, Vol. 12, Issue 2. 2013.
    連結:
  3. [4] Zach Liang, and George C. Lee. “Bridge Pier Failure Probabilities under Combined Hazard Effects of Scour, Truck and Earthquake. Part II: Failure Probabilities” Journal of Earthquake Engineering and Engineering Vibration, Vol. 12, Issue 2. 2013.
    連結:
  4. [6] Zach Liang, and George C. Lee. “Towards multiple hazard resilient bridges a methodology for modeling frequent and infrequent time-varying loads Part I” Journal of Earthquake Engineering and Engineering Vibration, Vol. 11, Issue 3. 2012.
    連結:
  5. [7] Zach Liang, and George C. Lee. “Towards multiple hazard resilient bridges a methodology for modeling frequent and infrequent time-varying loads Part II” Journal of Earthquake Engineering and Engineering Vibration, Vol. 11, Issue 3. 2012.
    連結:
  6. [8] 財團法人台灣營建研究院,「鐵路橋梁過河沖刷段橋墩與基礎結構系統檢測技術之研究」, 2008。
    連結:
  7. [9] 台灣世曦工程顧問股份有限公司,「橋墩即時沖刷深度警戒值與行動值之研訂」,2010。
    連結:
  8. [11] Parker, Gene W., Lisa Bratton, and David S. Armstrong. “Stream Stability and Scour Assessments at Bridges in Massachusetts” The Survey, 1997.
    連結:
  9. [13] Jean-Louis Briaud, Francis C. K. Ting, H. C. Chen, Rao Gudavalli, Suresh Perugu, and Gengsheng Wei. “SRICOS: Prediction of Scour Rate in Cohesive Soils at Bridge Piers” Journal of Geotechnical and Environmental Engineering, Vol. 125, No. 4, 1999.
    連結:
  10. [16] 沈明毅,「樁基礎縮尺橋梁模型之沖刷易損性曲線建置試驗研究」,國立台灣大學碩士論文,2013。
    連結:
  11. [17] Peggy A. Johnson, and Daniel A. Dock. “Probabilistic Bridge Scour Estimates” Journal of Hydraulic Engineering, Vol. 124, No. 7, 1998.
    連結:
  12. [19] Azadeh Alipour, Behrouz Shafei, and Masanobu Shinozuka. “Reliability-Based Calibration of Load and Resistance Factors for Design of RC Bridges under Multiple Extreme Events: Scour and Earthquake” Journal of Bridge Engineering, Vol. 18, No. 5, May 1, 2013.
    連結:
  13. [20] Alfredo H-S. Ang, Wilson H. Tang. “Probability Concepts in Engineering Planning and Design, Volume I-Basic Principles” Wiley, 1975.
    連結:
  14. [22] 陳能鴻,「單垮樁基礎橋梁模型之振動台實驗研究」,國立台灣大學碩士論文,2013。
    連結:
  15. [24] ASTM Standard D4253-93. “Standard Test Methods for Maximum Index Density and Unit Weight of Soils using a Vibration Test” Annual Book of ASTM Standards. ASTM International, West Conshohocken, PA, 2000.
    連結:
  16. [25] ASTM Standard D4254-91. “Standard Test Methods for Minimum Index Density and Unit Weight of Soils and Calculation of Relative Density” Annual Book of ASTM Standards. ASTM International, West Conshohocken, PA, 2000.
    連結:
  17. [29] Yin-Nan Huang. “Performance Assessment of Conventional and Base-isolated Nuclear Power Plants for Earthquake and Blast Loadings” ProQuest, 2008.
    連結:
  18. [2] Andrzej S. Nowak. “Calibration of LRFD Bridge Code” Journal of Structural Engineering, Vol. 121, No. 8, 1995.
  19. [5] Zach Liang. “Principles and Approaches for Multi-Hazard (MH) LRFD” 7th National Seismic Conference on Bridge and Highways. Keynote Speech, 2013.
  20. [10] Shirole, A. M., and R. C. Holt. “Planning for a Comprehensive Bridge Safety Assurance Program” Transportation Research Record 1290, 1991.
  21. [12] 林呈,「本省西部重要河川橋梁橋基災害分析與橋基保護工法資料庫系統之建立」,交通部運輸研究所專題研究計畫成果報告,1998。
  22. [14] Laura C. Bolduc, Paolo Gardoni, and Jean-Louis Briaud. “Probability of Exceedance Estimates for Scour Depth around Bridge Piers” Journal of Geotechnical and Environmental Engineering, Vol. 134, No. 2, February 1, 2008.
  23. [15] 交通部,「公路排水設計規範」,2008。
  24. [18] Jean-Louis Briaud, Paolo Gardoni, and Congpu Yao. “Statistical, Risk, and Reliability Analyses of Bridge Scour” Journal of Geotechnical and Geoenvironmental Engineering, Vol. 140, No. 2. 2014.
  25. [21] 台灣高鐵,「高鐵設施容許變形值一覽表」,2011。
  26. [23] ASTM Standard D3080-98. “Standard Test Method for Direct Shear Test of Soils Under Consolidated Drained Conditions” Annual Book of ASTM Standards. ASTM International, West Conshohocken, PA, 2000.
  27. [26] Applied Technology Council ATC-32. “Improved Seismic Design Criteria for California Bridges: Provisional Recommendations” Redwood City, California.
  28. [27] 蔡益超,「公路橋梁耐震性能設計規範研究」,交通部臺灣區國道新建工程局,2011。
  29. [28] Ghosn, M., F. Moses, & Wang, J. “NCHRP Report 489: Design of Highway Bridges for Extreme Events” Transportation Research Board, 2003.
Times Cited
  1. 劉俊仁(2015)。受沖刷橋梁可靠度設計方法研究。臺灣大學土木工程學研究所學位論文。2015。1-108。