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Development of deformation-based method for the behavior of masonry bracing elements, considering the cracked and inelastic state “CIC-BREL” Cracked Inelastic Calculation of BRacing ELements

Periodic Reporting for period 1 - CIC-BREL (Development of deformation-based method for the behavior of masonry bracing elements, considering the cracked and inelastic state “CIC-BREL” Cracked Inelastic Calculation of BRacing ELements)

Reporting period: 2018-03-16 to 2020-03-15

"Lateral Force Resisting System, in this case reinforced concrete core walls of a 10 story building consists of gravity columns and shear walls, has been analyzed in linear (assuming linear elastic material behavior of concrete) and nonlinear cracked (considering plastic material behavior of concrete) case, for seismic loading. Starting with the basic method of equivalent lateral force to estimate the seismic loads, then using the up to date method, The Performance Based Seismic Design, which uses real seismic records and apply the accelerations on the building using the software ETABS. After applying the accelerations, maximum resulted forces and deformations have been evaluated. The building then have been designed for the maximum resulted forces.
The contents of the main report are:
-General description of the building, site seismic information, site response spectra, loading and seismic forces including modal response spectrum analysis.
-Linear design of the model for gravity and seismic loads, P-M interaction diagrams developed for U cross section from reinforced concrete, designing longitudinal and shear reinforcement of the shear walls and coupling beam.
-Two variants of Nonlinear model, designing the core wall (shear walls) according to each variant, studying the influence of damping model on the nonlinear dynamic response, as well as the influence of the coupling beam model on the nonlinear dynamic response.
-Design verification, starting with defining the performance objects, and model for time history analysis. Two performance objectives have been studied: Fully operational and Life safety level verifications.
-Additional study was performed for the response of non-structural elements due to seismic loading in two cases: Fully operational and Life safety level verifications.
-Reinforcement Drawings have been finalized and attached to the report.
-Conclusion and recommendations was at the end of the report.

It is important for the society, because the used method could be used for the seismic design of any building. It could be wood building or masonry building. Designing a masonry building case will be the subject of future research project.

Overall objectives: Linear and Nonlinear seismic design of reinforced concrete building using the ""performance bases seismic design"""
Attending two annual meetings of The Masonry Society.

Paper to the 13 North American Masonry Conference.

Technical Report: Performance Based Seismic Design of Lateral Force Resisting System.

Preparing teaching material (presentations, homework, exams) for structural engineering classes considering seismic design: wood structure, steel structure, reinforced concrete, masonry structures.
"Performance Based Seismic Design of Masonry Structures:
Current design method of masonry structures, either reinforced or unreinforced, uses the simplified method of equivalent lateral force to
define the forces applied on the structure in case of an earthquake. Dynamic analysis using response spectrum or time history analysis is still
under work.
The current Technical Report: ""Performance Based Seismic Design of Lateral Force Resisting System."" uses both dynamic methods on
reinforced concrete structure. This could be in a very similar way used on masonry structures. There is very little work done in this field, working
on this subject would give better understanding of the masonry buildings.

Further expected results:
-Analytical models for shear–displacement curves of reinforced masonry panels with and without bending moments.
-Redistribution of internal forces in the lateral bracing system considering cracked and inelastic material behavior. Analysis method and verification with shake table test results."
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