Damage model for reinforced concrete beams under inelastic cyclic loads | |
| Author | Pokharel, Narayan Datta |
| Call Number | AIT Thesis no. ST-98-14 |
| Subject(s) | Reinforced concrete construction Concrete beams--Fatigue Earthquake resistant design |
| Note | A thesis submitted in partial fulfillment of the requirement for the degree of Master of Engineering |
| Publisher | Asian Institute of Technology |
| Abstract | Seismic damage in structures can be evaluated using various response parameters expressed in the form of damage model. Currently, a large number of damage models, formulated based on analytical and experimental results, are available. In assessing the damage, only a few of them are better accepted, but without any proper verification we cannot rely on these models. Analytical verification technique is difficult and experimental verification is the best choice. In the present study, experimental verification of three energy based damage models namely Park and Ang, Chai-Romstad-Bird, and Rajaram and Usami models are provided. Experiments were conducted on 15 reinforced concrete cantilever beams of identical shape and size using quasi-static testing method. These specimens were subjected to various displacement histories . which include monotonically increasing displacement, constant amplitude cyclic displacement and variable amplitude cyclic displacement. In order to understand the effect on the structural parameter and overall damage characteristics of the specimens with the change in design criteria, 10 specimens were designed according to the ACI 318-95 method and 5 specimens were designed according to the Capacity Design Method. The longitudinal reinforcement ratios for these two designs were identical, but shear reinforcement ratios were different. Higher amount of shear reinforcement ratio was provided in the specimens designed according to Capacity Design Method. From the extensive experimental works, strength degradation rate was found to be higher in the specimens designed according to ACI method compared to the specimens designed according to capacity method. Test results showed that the Park and Ang damage model works well for the damage assessment of reinforced concrete beams. The values of response parameter such as p evaluated by this model for the various beams were very consistent. From this systematic and controlled test of RIC beam specimens, the average value of p for the Park and Ang model was found to be 0.61 and 0.32 for the specimens designed according to ACI and capacity methods, respectively. The results also supported the assumption of path independent behavior up to the collapse state. |
| Year | 1998 |
| Type | Thesis |
| School | School of Civil Engineering |
| 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) | Kishi, Toshiharu;Pichai Nimityongskul; |
| Scholarship Donor(s) | Asian Institute of Technology Partial Scholarship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1998 |