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time with respect to another one due to reason of
symmetrical structural deficiency.
Xiaohan Wu, Jun Wang and Jiangyong Zhou, in this
paper author perform research on four multistory tower
interconnected on the top floor by a sky corridor bridge.
In this analysis seismic action is controlled by tuned mass
damper. Corridor is taken as friction pendulum tuned
mass damper. The connecter bridge used to bake for path
between four towers is connected by flexible links.
Perform 3-D software is used to analyze the 3-D model of
the framed multistoried connected tower developed by
Nosa CAD, Elastoplastic time history analysis is used to
analysis the model in Perform 3-D and the seismic
parameters are haul out from software and compared
against nonlinear response obtained in the result. The
model is compose of 8 multi storey framed structure in
which 6 storey is used for commercial purposes and
bottom three storey is used for basement. All the building
specifications are taken as per Chinese Code like C30
concrete is used in RCC members and C60 is used for
core tube wall. The result of the study shows that the
concept of frequency pendulum tuned mass damper is
found successful which reduce not only seismic action
and also deformation along with damage extent. When the
tower and corridor are connected by rigid connections
then the relative displacement developed in the tower is
resisted by isolation devices.
S Radhakrishnan, Dr K g Selvan, Dr S Senthil Kumar,
author raises an serious issue with this paper regarding
poor contruction practices and and negligence of primary
conditions like soil report etc. in this paper the case study
is done on an under construction 11 storied building that
is a twin tower that is swallowed by collapse located at
Moulivakkam, porur. The major issue raised is that one
building is fallen by itself during its own construction and
the other tower that was half built was devastated by
imploding. There is very extensive research work is
carried out by the author to find out all the possible reason
of this havoc. Actually the main reason of all this incident
is the death of 61 workers in the construction site by
collapsing of building by its own which bring this media
and finally to court. To analyze the case study the authors
firstly identify the builder with all of its qualification with
all the proper approvals released by the state authority.
Later the architectural and structural plans are again
assessed according to building requirements. After that
the soil study is carried out. Timeline is also presented in
the paper as evidence to show the exact details
chronologically. The results of the study shows that lack
of knowledge and construction practices adopted by
builders are the primary reason of this havoc. The team
selected for this kind of construction right from labor to
architect and engineers is not adequate and qualified for
this type of construction. Also the material should be
chosen for these types of structures are not as per
specification. Soil testing is not performed in proper
manner as foundation plays important role in this type of
structure. Also the structural drawings are not completely
tested and the work is not executed in the site as per
instruction. Similarly various loopholes are found in this
construction work which results in happening of such
perilous disaster.
M. R. Willford and R. J. Smith, here author presents the
design of two multistoried connected tower situated in
manila, which is a susceptible area confined by typhoon
winds and affected by seismic forces evaluated as UBC-
97 and zone 4. The building height is 210m and 30m in
plan. The building is designed for both wind and seismic
forces by performance based method. Both the towers are
made up of reinforced concrete and random arrangement
of columns and walls at the perimeter of the structure
along with an outrigger system that is 2 stories deep for
50 percent height of tower. Vertically acting fluid viscous
dampers are used to connect outrigger with the adjacent
column. The damping system used in the tower is termed
as Arup damped outrigger system which is a non-tuned
system and utilizes much lower space as compared to
tuned devices. The result of the study shows that with the
use of this non tuned damping system wind action is
considerably controlled. Other than that seismic forces are
resisted by the adopted performance based design which
not only make structurally viable but also economical. In
this design method 30% concrete is saved as compared to
conventional code based design procedure. Also the steel
density is controlled by a proportionate amount of 100
kg/m3 that is not possible by code’s analysis and design.
Andrew Luong and Michael Kwok, in this study authors
makes an attempt to the solution of vertical irregularity of
structures by connecting towers. Various key aspects are
taken into consideration comprises of wind tunnel action,
resistance against vertical earthquake loading, comfort
under vibration and wind action and lastly diaphragm
action in critical members. One storey deep steel trusses
are used to support the connecting portion of tower at the
lowest floor. Belt trusses are used to counter lateral
forces. The building is spread in a very large area of
4,50,000 m2. The results of the study shows that simply
the linking of top part of the cantilever linked path is not
simple but made possible by steel bracing system,
external continuous dia-grid tube system. The wind and
seismic action is resisted by reducing the floor plates in
the east-west direction and upper half portion of the