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 FE Study of Wave Activated Stiffness K of Track Foundation with Cavity
Tác giả hoặc Nhóm tác giả: VT Ngo, Yujin Lim
Nơi đăng: 한국철도학회 학술발표대회논문집, 2017; Số: 한국철도학회 학술발표대회논문집, 2017;Từ->đến trang: 353-354;Năm: 2017
Lĩnh vực: Kỹ thuật; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
This paper presents a finite element analysis for detecting the cavity existence under railway slab track foundation based on Wave Activated Stiffness K (WAK-RT). The WAK-RT test is one of impact response test methods developed to evaluate condition of the railway track foundation. The WAK-RT test is performed by applying a hammer impact load onto the railway concrete slab on the foundation soil and by obtaining the velocity response from a geophone sensor installed on the top surface of the concrete slab. The Wave Activated Stiffness K for railway track can be computed using the obtained experimental mobility (| v/F|) of the concrete slab. Cavities and obstacles looser than the surrounding soil cause a decrease in the Wave Activated Stiffness Ks. The theoretical background and FE modeling of WAK in ABAQUS are explained.
ABSTRACT
This paper presents a finite element analysis for detecting the cavity existence under railway slab track foundation based on Wave Activated Stiffness K (WAK-RT). The WAK-RT test is one of impact response test methods developed to evaluate condition of the railway track foundation. The WAK-RT test is performed by applying a hammer impact load onto the railway concrete slab on the foundation soil and by obtaining the velocity response from a geophone sensor installed on the top surface of the concrete slab. The Wave Activated Stiffness K for railway track can be computed using the obtained experimental mobility (| v/F|) of the concrete slab. Cavities and obstacles looser than the surrounding soil cause a decrease in the Wave Activated Stiffness Ks. The theoretical background and FE modeling of WAK in ABAQUS are explained.
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