STRENGTH AND BEHAVIOR OF SIMULATED CULVERT SECTIONS FAILING IN SHEAR.
ILLINOIS UNIV URBANA DEPT OF CIVIL ENGINEERING
Pagination or Media Count:
The object of this investigation was to explore the behavior and strength in shear of uniformly-loaded reinforced concrete frames. Eleven frames were tested, all under-reinforced in the horizontal member. Eight frames had no web reinforcement, while three had web reinforcement in the horizontal member in the form of bent bars symmetrically placed about midspan. Two different clear spans were used, six and ten feet and two different ratios of horizontal to vertical load, onethird and two-thirds. The reinforcement was provided so as to be approximately in proportion to the maximum positive and negative moments thus produced, using typical ratios of moment to axial load. Of the eight frames without web reinforcement tested, the four with longer span failed in diagonal tension, and the four with shorter spans failed in shear-compression. For a given span length, the load carrying capacity was not greatly increased with increasing axial load. Using the test data, a relationship was found between the shear at critical section and the axial load, both at cracking load. The ratio of axial load to shear at cracking was related to another independent parameter, the degree of fixity. The ratio of axial load to shear at cracking at the critical section seemed to depend on the span length and on the ratio of horizontal to vertical load, in addition to the degree of fixity. However, the effects of these additional variables could not be determined precisely from the limited number of tests made so far.
- Civil Engineering
- Structural Engineering and Building Technology