BUKU ABSTRAK - Universiti Putra Malaysia

Science, Technology & Engineering
Coupling Parallel Buildings by using Viscous Dampers under Dynamic Vibration
Prof. Ir. Dr. Mohd. Saleh Jaafar
Farzad Hejazi, Jamaloddin Noorzaei and Waleed Thanoon
Faculty of Engineering, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia.
+603-8656 7101; msj@eng.upm.edu.my
As time passes and population of cities increases, cities began to grow horizontally and vertically. Situations
became more critical due to the presence of tall buildings and regular occurrence of natural hazards. The number
of buildings in modern cities became higher along with the rapidly increasing human needs and structures were
constructed close to each other. This caused new problem known as mutual pounding of adjacent buildings
during occurrences of earthquakes. This innovation is an application of viscous damper system as coupling link
devices for parallel buildings in order to minimise the seismic response of structures. The viscous dampers system
has high capability on dissipation earthquake energy which would mitigate structural responses due to seismic
excitations which is developed for connecting the adjacent buildings. A special purpose finite element program
for nonlinear analysis of frame structures with nonlinear viscous dampers in the element library was developed.
Ten story twin tower reinforced concrete framed building was modelled and seismic response of structures with
and without application of damper for coupling were evaluated. The results showed that using viscous damper
for coupling of towers effectively reduced tower seismic response such as plastic hinge occurring in beam and
column sections and the movement amplitude of tower floors. The innovation is useful for engineers to produce
optimum design of twin towers or retrofitting of existing twin tower buildings and protect of parallel buildings
in earthquake excitation.
Keywords: Viscous damper, parallel building, vibration, earthquake, finite element
Development of Computational System in Safety Evaluation of Infrastructures
such as Roller Compacted Concrete Dams
Prof. Ir. Dr. Mohd. Saleh Jaafar
Jamaloddin Noorzaei, Aeid A.Abdulrazeg, Thamer Ahmed Mohamed and Parvin. Khanehzaei
Faculty of Engineering, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia.
+603-8946 6391; Msj@eng.upm.edu.my
Development of temperature rise in massive concrete structure such as a roller compacted concrete dam is
attributed to hydration of concrete and climatic changes on the convective boundaries. These thermal changes
in the material affect the elastic and creep properties of the material, and in turn, the stress fields within the
structure. Therefore, the effects of temperature on the properties of RCC materials (elastic, creep) has to be taken
into account in order to determine the risk of the thermally induced cracking in these dams. In the present work,
computer code for thermal and stress analysis of roller compacted concrete dam using finite element method is
presented. This code has the capability to model actual climatic conditions and the heat exchange between the
RCC dam body and the reservoir water taking into account the reservoir operation. In addition, the proposed
code modelled the mechanical properties (creep and elastic) by modifying the existing mechanical models to
be compatible with RCC materials and construction method. Safety against a crack occurrence over the time is
determined using crack criterion factor.
Keywords: FEM, roller compacted concrete dam, thermal stress, crack criterion factor
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