| Author | Santos, Ariel Pascual |
| Call Number | AIT Thesis no. ST-85-24 |
| Subject(s) | Concrete beams--Testing
|
| 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 |
| Abstract | An analytical solution is presented for the instantaneous deflection of pin-ended beams under midspan impact. Hertz's contact low which accounts for the elastic stiffness of the impact zone together with the beam vibration theory are incorporated in the analysis. This leads to an integral equation the solution of which by numerical method yields the force history. The deflection and velocity of the beam at the end of the forced vibration are used as initial conditions for the free vibration phase that follows at the end of impact. The maximum deflection which may follows at the end of impact. The maximum deflection which may occur during or after the first impact is computed automatically. To account for cracking of reinforced and prestressed concrete beams. published formulae for effective moment of inertia are adopted. For initial or single-blow impact, Branson's effective moment of inertia, Ie, is used. For repeated impact, the moment of inertia for repeated loading, Irep, is calibrated using impact test data obtained a the AIT. Comparisons are made with published experimental results for seventeen groups of reinforced and prestressed concrete beams tested at the British Building Research Station as well as those of twenty reinforced concrete beams obtained at the Cement and Concrete Association. These indicate that the proposed computational procedure is generally accurate. The method is shown to be superior to existing solutions based on the equivalent static approach. Design charts which account for the dynamic analysis of beams under impact are presented. These, together with the proposed procedure for obtaining the effective moment of inertia, enable the impact deflection of concrete beams to be calcalcuated manually. |
| Year | 1985 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Yew-Chaye Loo |
| Examination Committee(s) | Brotton, Derick M. ;Karasudhi, Pisidhi |
| Scholarship Donor(s) | German Academic Exchange Service, (DAAD) Federal Republic of Germany |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1985 |