Simon Tanios.2016. Master of Engineering Thesis. Structural design and analysis of high-rise buildings subject to seismic and wind loads - Case study

August 12, 2019 | Author: tanioseng | Category:
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In this study, important concepts were tackled related to the design of high rise buildings, and
an offices building of 20 stories and four basements was studied. The seismic behavior of the
building and the soil-structure interaction were examined and drawings were made. The work
steps that were done can be presented as follows:
 The codes to be used, the loadings, the stiffness modifiers were set.
 The seismic design acceleration in Lebanon were reviewed in many literature, a seismic
analysis was performed considering multiple effects as P-delta and the orthogonal effects.
 A static seismic analysis was done manually according to UBC-97 and ASCE7-10.
 A model was generated in Etabs to consider the dynamic behavior of a seismic excitation
and the static behavior of 12 different wind cases.
 A comparison between Ritz and Eigen vectors, and between different methods of
combinations as CQC3 and SRSS was showed.
 A check for the mass participation ratio, the story drift, the overturning moment was
done.
 An analysis of the long term deflection of the slabs was performed in Safe software and
rebar drawings were generated.
 Reinforcement drawings of columns and shear walls were done using S-concrete
software.
 Soil pressure and settlements under the raft were checked and reinforcement drawings
were done.
 Basement walls were studied considering the lateral soil pressure.
 Two additional models were generated in Etabs considering the soil under the raft and the
soil along basement walls and comparisons where deducted.
In addition, through the study:
 We obtained a complete structural design of the building and reinforcement drawings (all
drawings are annexed to this report).
 Multiple codes are recommended to be used during design when considering the ground
acceleration and the seismic structural design.
 In our case, the soil along basement walls had a negligible influence on the periods of the
structure, while the soil underneath changed the results of the base shear and the
fundamental period of the structure. In other cases, results can be different.
 Studies should be done to set the long-period transition period in Lebanon.
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