Design improvement of R/C interior beam-column joints in low to moderate seismic risk regions | |
| Author | Pramin Norachan |
| Call Number | AIT Thesis no.ST-05-16 |
| Subject(s) | Buildings, Reinforced concrete--Thailand Concrete beams Buildings--Earthquake effects--Thailand |
| Note | A thesis submitted in partial fulfillment of requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-05-16 |
| Abstract | The design improvements of the seismic performance of the interior beam-column joints in mid-rise buildings in Thailand were selected from the possible ways to resist the earthquake effects. Joint without joint transverse reinforcement was specimen R, which commonly adopted in low to moderate seismic risk regions have been proven unsatisfactory for strength and ductility under the seismic loading. Moreover, joint shear failure occurred in this specimen. Three kinds of new joint details are proposed in this study which they were fabricated in different ways. The joint containing transverse reinforcement was specimen JR, which was provided only 37% of the minimum amount required by ACI 318-02 in areas of high seismicity. Specimen DS contained the diagonal steel bar in the joint region, which was provided only 63% of horizontal joint reinforcement of specimen JR. Finally, specimen UBB, the beam bars did not be bonded to the concrete within joint region and the beam plastic high zone was confined by using the stirrup two times of specimen R. The test results showed that, depending on the reinforcing detailing within the joints, different failure modes occurred. Specimen DS and JR had proved that it is effective to reduce the joint deformation. The diagonal steel bar prevented the diagonal tensile cracks and sustained the high compressive strut in the joint region. The comparison of the test results was that special reinforcing detail in joint based on the experimental investigation led to increasing the peak load 20% and 17% respectively, but these specimens cannot avoid joint shear failure at the final stage. In the contrary, specimen UBB could change the mode of failure to the beam crushing failure but peak resistant did not increased. The failure of the beam-column joint must be avoided and precluded to preserve the structural integrity of members jointed as rigid and strong as they are assumed in the structural analysis. Therefore, Specimen UBB is appropriate for interior beam-column joints in low to moderate seismic risk regions. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-05-16 |
| 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; |
| Scholarship Donor(s) | Royal Thai Government Fellowship; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |