강봉 트러스 시스템으로 보강된 조적벽체의 면내·외 내진 거동 평가
In-plane and Out-of-plane Seismic Performances of Masonry Walls Strengthened with Steel-Bar Truss Systems
1
조회
0
다운로드
5
인용
0
참고문헌
키워드
초록
이 연구에서는 강봉 트러스 시스템으로 보강된 조적벽체의 면내·외 거동에 대한 내진성능을 평가하였다. 강봉 트러스 시스템 보강은 무보강 조적벽체 1면에 2개의 강봉 트러스 시스템 유닛을 배치하였다. 면내 거동에 대한 실험결과는 무보강 조적벽체 및 벽체 1면에 1개의 강봉 트러스 시스템 보강된 조적벽체와 비교하였으며, 면외 거동에 대한 실험결과는 무보강 조적벽체와 비교하였다. 실험 결과, 강봉 트러스 시스템으로 보강된 조적벽체의 면내·외 초기 강성은 무보강 조적벽체에 비해 각각 1.9배 및 2.3배 높았으며, 면내·외 최대 내력은 각각 1.8배 및 1.9배 높았다. 특히 강봉 트러스 시스템으로 보강된 조적벽체의 면내·외 에너지 소산능력은 무보강 조적벽체에 비해 각각 6.1배 및 2.4배 높았으며, 등가 감쇠비는 각각 5.1배 및 1.2배 높았다. 즉, 강봉 트러스 시스템은 무보강 조적벽체의 면내 방향으로의 내진성능 향상뿐만 아니라 면외 방향으로의 내진성능 향상에도 유리할 것으로 판단된다.
Abstract
This experimental study was conducted to evaluate the in-plane and out-of-plane seismic performances of an unreinforced masonry walls (URMs) strengthened with prestressed steel-bar truss systems developed in the present investigation. The truss systems were installed on both faces of the walls. All the wall specimens were subjected to lateral in-plane or out-of-plane cyclic loads at the fixed gravity stress of 0.25 MPa. The seismic performance of the strengthened specimens was compared to that measured in the counterpart URM. When compared with the lateral load-displacement curve of the URM, the strengthened walls exhibited the following improvements: 190% for initial stiffness, 180% for peak strength, 610% for accumulated energy dissipation capacity, and 510% for equivalent damping ratio under the in-plane state; the corresponding improvements under the out-of-plane state were 230% for initial stiffness, 190% for peak strength, 240% for accumulated energy dissipation capacity, and 120% for equivalent damping ratio, respectively. These results indicate that the developed technique is very promising in enhancing the overall seismic performance of URM.
참고문헌 (20)
- Site Inspection and Damage Investigation of Buildings by Earthquakes in Gyeongju and Pohang, "AIK", Architectural Institute of Korea, ~ (2018)
- "ASTM C 1314, Standard Test Method for Compressive Strength of Masonry Prisms", ASTM International, ~ (2007)
- "ASTM E 519, Standard Test Method for Diagonal Tension(Shear) in Masonry Assemblages", ASTM International, ~ (2003)
- Bhattacharya, S., "A critical review of retrofitting methods for unreinforced masonry structures", International Journal of Disaster Risk Reduction, 7, pp.51~67 (2014)
- Capozucca, R., "Experimental analysis of historic masonry walls reinforced by CFRP under in-plane cyclic loading", Composite Structures, 94(1), pp.277~289 (2011)
- Chang, K. K., "Present State and Necessity of Seismic Design for Low-rise Masonry Buildings in Korea, Special Issue", Review of Architecture and Building Science, 55(5), pp.45~50 (2011)
- Darbhanzi, A., "Investigation of in-plane seismic retrofit of unreinforced masonry walls by means of vertical steel ties", Construction and Building Materials, 52, pp.122~129 (2014)
- "FEMA 356 , Prestandard and Commentary for the Seismic Rehabilitation of Buildings", FEMA, ~ (2000)
- Hwang, S. H., "Evaluation on Seismic Performance of Masonry Walls Strengthened with Unbonded Steel-Bar Truss Systems", Journal of the Korea Concrete Institute (2020)
- Ismail N, "Cyclic out-of-plane behavior of slender clay brick masonry walls seismically strengthened using posttensioning", Journal of Structural Engineering, 138(10), pp.1255~1266 (2012)
- "KCS 41 34 02, Brick Construction", Korea Construction Standard Center, ~ (2018)
- "KCS 41 46 02, Cement Mortar Coat", Korea Construction Standard Center, ~ (2018)
- "KS B 0802, Method of Tensile Test for Metallic Materials", KSA, ~ (2018)
- "KS F 4004, Concrete Bricks", KSA, ~ (2013)
- 이정한, "중저층 건축물의 내진성능 및 내진보강 : 순수조적조, 조적채움벽 철근콘크리트 골조 및 강재 슬릿댐퍼 보강 철근콘크리트 골조", 박사, 건축공학, pp.2005
- Study on Seismic Retrofitting Techniques for Unreinforced Masonry Buildings, "NIDP", National Emergency Management Agency, ~ (2009)
- Popa, V., "Retrofitting of squat masonry walls by FRP grids bonded by cement-based mortar", Earthquakes and Structures, 10(1), pp.125~139 (2016)
- Rinaldin, G., "Review of experimental cyclic tests on unreinforced and strengthened masonry spandrels and numerical modelling of their cyclic behavio"", Engineering and Structures, 132, pp.609~623 (2017)
- Yang, K. H., "In-plane seismic performance of unreinforced masonry walls strengthened with unbonded prestressed wire rope units", Engineering and Structures, 45, pp.449~459 (2012)
- Yang, K. H., "Cyclic Shear Behavior of Masonry Walls Strengthened with Prestressed Steel Bars and Glass Fiber Grids", Composite Structures, 238, pp.1~12 (2020)