Analysis of a Reinforced Concrete Shear Wall
M.Sc Thesis
Björk Hauksdóttir, 2007
M.Sc Thesis
Björk Hauksdóttir, 2007
Abstract
In June 2000 two major earthquakes with moment magnitude 6.6 occurred, after 88 years of rest, in the central part of the South Iceland Seismic Zone (SIZS). Earthquakes in this region have several times since the settlement of Iceland caused collapse of the majority of houses and number of casualties. It has been estimated that no more than one fourth of the strain energy in the SIZS was released in the two June 2000 earthquakes resulting in that large earthquakes may occur in the zone during the next few decades.
The main objective of the research work presented in this thesis is to study the nonlinear behavior of a reinforced concrete shear wall with different reinforcement arrangements in an idealized three story building located in the SISZ subjected to a step-wise increasing lateral earthquake load.
Four different reinforcement arrangements of the shear wall are considered. Firstly, a reinforcement in which the design is based on the Stringer method. Secondly, a reinforcement in which the design is based on linear elastic finite element method analysis using general purpose FE-program (SAP2000). Thirdly, a reinforcement again based on linear elastic FEM but here using a building specialized FE-program (ETABS), which has a special post-processor to present section forces. Fourthly, a reinforcement based on minimum reinforcement requirements from Eurocode 2.
The nonlinear behavior of the four different reinforced shear walls is then tested by non-linear pushover analysis using the general purpose FE-program ANSYS. An attempt is made to evaluate crack width calculations as a function of load to reflect the damage. The study show that different reinforcement layouts affect the response of the wall and the difference in crack width is mainly due to the boundary reinforcement. The crack widths calculated by using the information from ANSYS seem to be promising and useful when designing and analysing structures in seismic zones.
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