Earthquake Resistant Structures Laboratory
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Associate Professor

Tomoya MATSUI（E-mail：matsui@ace.tut.ac.jp ）http://www.rc.ace.tut.ac.jp/matsui/index.html
Reinforced concrete structures, Steel concrete composite structures, Seismic
performance evaluation, seismic retroﬁtThis laboratory conducts research into the reduction of damage caused to structures by earthquakes.
Our principle goals are to increase the seismic resistance capacity of concrete structures (reinforcedconcrete structures, steel concrete composite structures) and establish methods for evaluating their seismic
resistance capacity, and we are advancing our research from the approach of both experiments (static anddynamic testing) and analysis (earthquake response analysis and FEM analysis). Our research themes alsobranch out across a diverse range, including the development of new building structure systems, the seismic
retroﬁtting of existing buildings, and methods for evaluating existing buildingʼs seismic resistance capacity.
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Development of composite concrete encased steel structural system
Theme 1This research intends to develop a new structural system (CESstructure), comprised of a steel frame and ﬁber reinforced concrete,oﬀering excellent seismic resistance capacity. The current structural
system of steel reinforced concrete is known for oﬀering extremely
good seismic resistance, but issues remain in terms of bothconstruction and the length of time that construction takes due to thesteel frame and rebar placing. In order to resolve these issues weare conducting ongoing research and development into a composite
concrete encased steel structure that cuts out the rebar, with theultimate aim of practical applications. As well as conducting parts
testing in order to understand the structural capabilities of the CES
Static loading test of CES beam-column jointstructure, we also implement simulation analysis (FEM analysis),studying internal stresses that cannot be understood through justpractical experiments.
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Theme 2
Structural performance of RC shear walls with multiple openings
This research intends to formulate a more logical structural
performances evaluation method for reinforced concrete shear wallswith multiple openings. Restrictions due to building plans etc. often
result in shear walls having openings in them. Because those withopenings display much more complex failure mechanism whencompared to those with no openings, this makes them extremely
hard to handle in regard to design. Therefore, in order to establish
FEM analysis of RC wall with multi openings
a more logical structural performances evaluation method we are: Crack situation (left ; experiment, right ;analysis)
implementing static loading test on RC shear walls with openings in
diﬀerent positions and of diﬀerent sizes, investigating their structuralperformances. Alongside these tests we are also conducting numerical analysis, investigating the stresstransfer mechanisms and numerical analysis models for RC shear walls with multiple openings.
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Theme 3After the 2010 earthquake in Chile, much attention was drawn to thefact that concrete crushes due to bending and compression on multistory shear walls without boundary columns in RC structures led
to some buildings completely collapsing. Therefore, this researchintends to develop a method for retroﬁtting these kinds of walls without
columns against concrete ﬂexural failure by using carbon ﬁber sheets.
By conducting structural experiments on RC walls without boundary
column retroﬁtted by being wrapped in carbon ﬁber sheets, we have
conﬁrmed a delay to the crush to the concrete at the bottom of the wallthat occurs ﬂexural failure, and an improvement in deformation capacity.

Static loading test of retroﬁtted wall using
carbon ﬁber sheets