| Author | Islam, Md. Shahidul |
| Call Number | AIT Thesis no. ST-93-12 |
| 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 | Most of the design codes adopt a shear design formula, which is mostly derived from two
point loading simple beam tests. But in actual structures the designer often faces other types
of structural members, loading and sectional force distribution pattern, which are quite
different from the simple case as used to formulate the design codes. This experimental study
has been conducted to make clear the effects of moment distribution pattern on the shear
strength of RC beams. Nine RC beams of size 15(b) cm. x 25(h) cm. and length of 340 cm.
were tested. The main reinforcement (2%) was kept constant for all the beams. The beams
were designed in such a way that flexural failure should not occur. The beams were placed
at 220 cm. span simple supports. In order to measure the strains, stresses, poissons ratio,
modulus of elasticity, Electrical Resistance Strain (ERS) gauges and Rosettes were attached
to the surface of steel and concrete. To investigate the load-deflection response, dial gauges.
were also placed at the top and bottom of beams. A Four point loading pattern was used
except for simple loading case. By varying the location of loading position in the over hanging
portion, the location of point of contraflexure was moved. To compare the results a two point
loading pattern was also adopted. The results obtained indicate that moment distribution
pattern influences the shear capacity as much as 70%, which is very important to be
considered in designing continuous RC beams. The results were compared with the case when
the beam is subjected to uniformly distributed loads, which was studied by Y. Aoyagi (1992)
in Japan, where the inflexure point influenced the shear capacity as much as 40%. Finally the
experimental result was compared with A CI code's detailed shear capacity calculation formula,
Niwa's equation and the equation proposed by Y. Aoyagi. The proposed equation determines
the shear capacity which was very closer to the experimental result other than the other
existing shear capacity calculation equations. |
| Year | 1993 |
| Type | Thesis |
| School | School of Civil Engineering |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Aoyagi, Yukio |
| Examination Committee(s) | Worsak Kanok-Nukulchai ;Pichai Nimityongskul ;Pennung Warnitchai ; |
| Scholarship Donor(s) | German Academic Exchange Services (DAAD). ; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1993 |