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Residual Axial Capacity and Damage Restorability of Reinforced Concrete Columns after Earthquake
| Content Provider | Semantic Scholar |
|---|---|
| Author | Tasai, Akira |
| Copyright Year | 1999 |
| Abstract | Deterioration of axial strength of flexural column was analyzed by inelastic moment-curvature analysis of the section using fiber-model. In the analysis, after cyclic loading to the section, the axial strain uniformly increased to obtain the axial strength. The analysis demonstrated significant deterioration of axial strength before ultimate limit state defined as the state that axial load capacity decreased to the level of long-term axial load. Experimental program was executed not only to observe the phenomenon but also to study the effect of repair after the deterioration of axial strength. About a half scale column specimens were loaded in the axial direction after cyclic lateral loading. It was found that the deterioration of axial capacity was large under large longterm axial load or large compressive varying axial load. Simple repair methods were applied to specimens damaged due to lateral loading; i.e. replacing crushed cover concrete to rapid hardening type cement mortar with same strength as the original concrete or injecting epoxy into cracks. Both lateral stiffness and strength of repaired column whose axial strength deteriorated by the original lateral loading were lower than those of original one. Sequential moment-curvature analysis including original and post-repair loading indicated that softening of a part of core concrete during original loading significantly influenced on the performance after repair. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.iitk.ac.in/nicee/wcee/article/1244.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
