Title : Responses of 3d excavation and adjacent buildings in sagging and hogging zones using decoupled analysis method

Page : PP.85-96

Author(s) : Horn-Da Lin, Sang Mendy, Hui-Ching Liao, Phuoc H. Dang, Yo-Ming Hsieh, and Cheng-Cheng Chen

Keyword : ground settlement, Excavation, soil-structure interaction, 3D simulation, building damage, decoupled analysis method.

Abstract : 

Deep excavation in metropolitan regions must take account of the safety of the construction site and the serviceability of the nearby buildings. This evaluation is rarely comprehensive because of the complication of the structure-excavation system especially if the three-dimensional (3D) nature is considered. This paper studies 3D deformation characteristics for excavation and the responses of adjacent buildings located in different settlement zones. The adjacent building that is studied is a typical low-rise school building supported by spread footings. A robust decoupled analysis method (DAM) that considers nonlinear soil behavior and inelastic structural responses is developed. Different scenarios for the wall deflections, building settlements, plastic hinges of the structure and member forces of the tie beam are studied for an adjacent building that is positioned in sagging, transition and hogging zones. The analytical results show that building settlement can differ significantly from greenfield settlement, depending on the location of the building. A building in a sagging zone is more prone to damage because it experiences larger angular distortion and plastic hinge formation than buildings at other locations. However, a building in a transition or a hogging zone exhibits tension in the tie beam because of the differential horizontal movement of the footings. The engineering implications of the results of this study are discussed in this paper.

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