Thick Walled Multiple Opening Reinforced Concrete Conduits.

摘要

The construction and testing of three closed three span reinforced concrete frames representing slices of reinforced concrete conduits designed for loads up to 30,000 psf are described,as are the results of the tests. The tests are the first known tests of complete frames made of deep reinforced concrete members,and the results of the tests indicate that the shear strength of such members may be much less than of simply supported members having similar geometry and loading conditions. Additional work is required in order to develop suitable design criteria for such structures. The development of analytical techniques,using the finite element method,to predict the behavior of the structures is described. The analysis includes the effects of cracking,nonlinear stress-strain characteristics of the concrete,and yielding of the reinforcement. The results of an elastic analysis of one of the model structures is presented in the report,and there is good agreement between the predicted and initial measured slopes of various load-strain curves. (Modified author abstract)