Mechanical behavior of beams including various damage and non-uniformity | |
| Author | Gurung, Chandra Bahadur |
| Call Number | AIT Thesis no. ST-99-7 |
| Subject(s) | Girders--Testing Girders--Testing |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering. |
| Publisher | Asian Institute of Technology |
| Abstract | Sound and homogeneous section is rarely possible in reinforced concrete member. Micro level damages are always present due to insufficient curing in the form of drying shrinkage and autogeneous shrinkage and question the soundness of the structural member. Neither the presence of the same under early age structural loading can be denied. The adverse effect of presence of severe drying is presented experimentally for monotonic loading. The beams designed for flexural compression failure was found failed in diagonal tension, for both Normal Concrete (compressive strength about 350Kgf/cm2 ) and Self-compacting High Performance Concrete (compressive strength about 800Kgf/cm2 ) , under severe drying condition. However, presence of uniform fine cracks in the tension fiber simulating early age loading could not devaluate the structural performance like severe drying under monotonic loading. Instead, it showed improved displacement ductility, especially in case of Normal Concrete beams. With these experimental acknowledgement, it is thought that presence of fine cracks and microcrack due to severe drying is not the main cause for devaluation of structural pe1formance but the loss of compressive strength due to hindrance to hydration of cement and internal stress developed due to shrinkage. The inhomogeniety in material property in reinforced concrete volume was experimentally simulated. Two different layers of concrete of different compressive strength, two different layers of concrete and mortar of almost same compressive strength as well as corroded bars were used. Through the experiment it was concluded that presence of such material inhomogeniety could not impair the structural performance appreciably. The sufficient confinement was provided by the rebar to the surrounding concrete/mortar and the structural performance was not impaired. Through WCOMD-SJ analytical simulation by adjusting tensile strength and softening coefficient, these experimental evidences were approached. |
| Year | 1999 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Construction Engineering and Infrastructure Management (CM) |
| Chairperson(s) | Kishi, Toshiharu;Kishi, Toshiharu; |
| Examination Committee(s) | Wijeyewickrema, Anil C.;Pennung Warnitchai; |
| Scholarship Donor(s) | Government of Austria.; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1999 |