Concrete walls founded on earthquake areas

Calculations made by structural engineers of structural models are almost fixed to the ground (cantilever), even though in reality, the structures are founded on bedrock or soil bed. In the project, 10 walls are modeled in a structural software program, five squat walls and five slender walls. The walls have different foundations, fixed to the ground (cantilever), founded on bedrock and founded on soil bed (gravel) with and without damping. Earthquake load react under all walls, i.e. time history analysis. The main object of this project is to show how different foundations change the behavior of walls during seismic activity. The analysis of this behavior requires models that take into account not only the structure, but also the bedrock, soil bed and the dynamic interaction forces existing between them. The wall and support were modeled using finite element method (FEM) and boundary element method (BEM). The calculations were carried out using the software ANSYS. The soil-structure interaction (SSI), model was separated into near-field and far-field using FEM to represent the near-field, and viscous dampeners placed around the FEM model as boundary elements to represent the far-field. The results show that the effects of rocking the walls changes their behavior profoundly; displacements increased while the stress and shear forces diminished. A careful estimate would be that walls on bedrock are 25% less reinforced than fixed walls, and the walls on gravel bed are 50% less reinforced than fixed walls.

Author dc:creator

• Helgi Sigursteinn Ólafsson 1979-

Contributors dc:contributor

• Háskólinn í Reykjavík

• Jarðvegur
• Jarðskjálftar
• Mannvirkjagerð
• Byggingarverkfræði
• Meistaraprófsritgerðir
• Tækni- og verkfræðideild
• Earthquakes
• Soil structure
• School of Science and Engineering

Language dc:language.iso

en

Handle dc:identifier.uri

http://hdl.handle.net/1946/6882

OAI identifier oai:identifier

oai:skemman.is:1946/6882