Assessment Of Monar Arch Dam Under
Extreme Seismic And Thermal Loads
Author(s)
A. Manafpour, S. Gallocher, D. Kourepinis & A. C. Morison
Abstract
Monar dam is a double-curvature concrete arch dam in the north west of the UK
constructed in the early 1960s. This paper examines the elastic response of the
dam under seismic and temperature loads using a 3-dimensional finite element
model that takes into account dam-foundation-water interactions. Seismic loads
are applied in three main orthogonal directions using synthetic ground motions,
while temperature load is based on minimum and maximum mean daily ambient
air temperatures at the site. Additionally a temperature gradient exists through
the thickness of the dam between the upstream and downstream faces.
The study shows that temperature has a significant role in determining the
final stress distribution within the dam. The results indicate that for summer
loadcases a band of high tensile stress is developed on the downstream face near
to the dam/rock interface. The addition of the seismic loading increases the
tensile stresses from the normal summer loading by a relatively modest amount.
This might, however, be sufficient to cause the development of significant
cracking.
Keywords: Arch dam, Seismic analysis, thermal loading, Westergaard added
mass, soil-water-structure interaction, temperature gradient.
1 Introduction
The UK has experienced relatively low levels of seismic activity throughout
recorded history and earthquake loading has not been incorporated into the
design of many British dams. In line with developments in earthquake
engineering and taking into account the level of risk associated with many of
existing British dams, which are situated immediately upstream of population
Keywords
Arch dam, Seismic analysis, thermal loading, Westergaard added
mass, soil-water-structure interaction, temperature gradient.
Related Book
Other papers in this volume
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