연약지반에 건설된 단일형 현장타설말뚝 교량의 근단층지반운동에 대한 내진성능
Seismic Performance of Bridge with Pile Bent Structures in Soft Ground against Near-Fault Ground Motions
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참고문헌
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초록
근단층 지역에 위치한 교량은 근단층지반운동에 대한 내진안전성을 확보하는 것이 중요하다. 본 연구에서는 연약지반이 두껍고 다양한 지층으로 구성된 지역에 건설되는 단일형 현장타설말뚝 교량의 지진거동특성과 내진안전성을 분석하였다. 근단층지반운동을 생성하고 지반해석을 수행하여 각 지층에서의 지반가속도이력을 산정하였다. 이 가속도이력을 이용하여 각 지층의 지반을 등가스프링으로 모델화하고, 각 지층에서의 가속도시간이력을 입력지반운동으로 하는 다지점 가진 지진해석을 수행하였다. 근단층지반운동의 특성으로 인하여 교량은 탄성영역 내에서 거동하였지만 최대모멘트의 발생 위치 등이 설계지반운동을 고려할 때와는 상이한 특성을 보였다.
Abstract
For the structures near the seismogenic fault, the evaluation of seismic performance against near-fault ground motions is important as well as for design ground motions. In this study, characteristics of seismic behaviors and seismic performance of the pile-bent bridge constructed on the thick soft soil site with various weak soil layers were analyzed. The input ground motions were synthesized by the directivity pulse parameters for intra-plate regions. The ground motion acceleration histories of each layer were obtained by one-dimensional site response analysis. Each soil layer was modeled by equivalent linear springs, and multi-support excitations with different input ground motions at each soil spring were applied for nonlinear seismic analyses. The analysis result by the near-fault ground motions and ground motions matched to design spectra were compared. In case of the near fault ground motion input, the bridge behaved within the elastic range but the location of the maximum moment occurred was different from the result of design ground motion input.
참고문헌 (13)
- Jeon, K. S., "Design Criteria for Pile Bent Structure", 68, pp.14~27 (2004)
- Son, H. S., "Design of Single Column Drilled Pier Foundation in Incheon Bridge Viaduct", Korean Society of Civil Engineers conference, pp.959~962 (2005)
- 박창규, "근단층지반운동에 대한 상부구조 질량 변화에 따른 RC 교각의 응답분석", 콘크리트학회 논문집, 22(5), pp.667~673 (2010), 한국콘크리트학회
- Mohammad Hajali, "Effect of Near Fault and Far Fault GroundMotions on Nonlinear Dynamic Response and Seismic Improvement of Bridges", Civil Engineering Journal, 4(6) (2018)
- 안상용, "단일 현장타설말뚝의 소성힌지를 고려한 최적설계법 제안", 한국지반공학회논문집, 27(2), pp.91~101 (2011), 한국지반공학회
- 여규권, "화강암편마암에 근입된 단일현장타설말뚝의 수평거동특성", 지질공학, 18(4), pp.493~499 (2008), 대한지질공학회
- 전경수, "풍화암에 근입된 현장타설말뚝의 연직 및 횡방향 지지거동 분석", 박사, 토목공학, pp.2000
- Dynamic Response of Bridges to Near-fault, Forward Directivity Ground Motions, , Washington State Transportation Commission. Department of Transportation and in cooperation with U.S. Department of Transportation Federal Highway Administration, ~ (2007)
- "Active Fault Map and Seismic Hazard Map", National Emergency Management Agency, ~ (2012)
- Ohsaki, Y., "On dynamic shear moduli and Poisson’s ratio of soil deposits", Soil and Foundation, 13, pp.61~73 (1973)
- Mander, J.B, "Observed stress-strain behavior of confined concrete", J, Struct. Div, 114(8), pp.1827~1849 (1988), ASCE
- Method of analysis of cyclically loaded RC plane frames including changes in geometry and non-elastic behavior of elements under normal force and bending, "Menegotto, M.", IABSE, ~, pp.Preliminary Report IABSE, 13 (1973)
- Somerville, P. G., "Modification of Empirical Strong Ground Motion Attenuation Relations to Include the Amplitude and Duration Effects of Rupture Directivity", Seismological Research Letters, 68(1), pp.199~222 (1997)