Relevance of beam-column joint damage on seismic performance of RC framed buildings | |
| Author | Rajbhandary, Aloke |
| Call Number | AIT Thesis no.ST-05-01 |
| Subject(s) | Buildings--Earthquake effects Concrete beams |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-05-01 |
| Abstract | The study investigates the beam-column joint damage in the seismic performance of an existing gravity-load designed RC frame. Experimental investigation of the earthquake response of reinforced concrete subassemblages indicate that stiffness and strength loss resulting from the beam-column joint damage is substantial and as such the joint damage at component level is detrimental. On the other hand few studies also suggest that the gravity load designed buildings will form a hybrid local and global failure mechanism which is related to the joint damage and thus will prevent the soft storey collapse of the frame by spreading the interstorey drift demand between the storey above the joint and the storey below the joint and thus reducing the rotation demand in the adjacent column elements. The fact that we do not know the effect of joint damage on the global response of the building leads to this study. To simulate the inelastic joint action, joint element realistic model of beam-column joint is used. The joint model considered comprises of 13 one-dimensional components that explicitly represent the three types of inelastic mechanisms that may determine the earthquake response of beam-column joints viz. anchorage failure of beam and column longitudinal reinforcement embedded in the joint, shear failure of the joint core and shear-transfer failure at the beam-joint and column-joint interfaces. Apart from this the beams and columns are modeled using fiber elements such that the plasticity can spread throughout the length of these elements. The nonlinear static (pushover) analysis is used as the analysis method and analysis platform is OpenSees. The study is carried out by analyzing a conventional gravity load designed frame. The hierarchy of the failure mechanism in case of the building using the beam column joint damage model is studied by comparing it with the rigid end offset model. Effects of the bond deterioration and slip of reinforcement bars in the joint core are discussed. The analysis results shows the progressive failure mechanism and the type of failure mechanism which prevails in the gravity load designed frame. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-05-01 |
| 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; |
| Examination Committee(s) | Pichai Nimityongskul;Barry, William J; |
| Scholarship Donor(s) | Government of Austria; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |