Modelling approaches for gravity-only framing not designated as part of the seismic force resisting system in performance-based design(PBD) of tall buildings | |
| Author | Umer, Ahsan |
| Call Number | AIT Thesis no.ST-24-01 |
| Subject(s) | Earthquake resistant design Framing (Building) Tall buildings--Earthquake effects |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Structural Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | As tall buildings has become an important part of the infrastructure. They are considered as symbol of development as a result many developing countries are moving towards tall buildings infrastructure as they hold many advantages like accommodate large population in small area and also act as a tourist attraction. Various structural systems are used for the design and construction of tall buildings such as Bearing Wall system, Building Frame System, Dual system etc. This study focuses on the Building Frame System in which 100% of lateral loads are resisted by lateral system and gravity system only resists gravity loads. In performance based MCE level evaluation of building frame system, members in lateral system are modelled as nonlinear and extent of damage is assessed in terms of deformation demand. However, members not designated as part of lateral system are modelled as linear and provide the moment releases in them so that the seismic forces are not transferred to them. Absence of explicit evaluation of gravity system against lateral loads results in unrealistic design. This study is centred on two modelling approaches for gravity-only framing in performance-based seismic design. The performance of the structural system will be evaluated by using two modelling approaches under Maximum Considered Earthquake. In the 1st modelling approach, nonlinearities are considered in the lateral system only. Gravity frame is modelled as linear and moment releases are applied so that the gravity frame does not participate in the lateral system during the lateral analysis. In the 2nd modelling approach, nonlinearities in both the lateral system and gravity frame are considered. Force redistribution between lateral system and gravity frame are considered during the analysis. The results of both the modelling approaches are evaluated and compared and it is concluded that by including the gravity frame in the lateral analysis improves the overall structural behavior and response of the building. |
| Year | 2024 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pennung Warnitchai;Anwar, Naveed (Co-chairperson); |
| Examination Committee(s) | Punchet Thammarak;Krishna, Chaitanya; |
| Scholarship Donor(s) | Computer and Structures Inc. (CSI), USA;AIT Scholarships; |
| Degree | Thesis (M. Eng.) - Asian Institute of Technology, 2024 |