| Summary: | 碩士 === 國立交通大學 === 土木工程系 === 87 === The objectives of this research are to investigate the composite action between the steel and the RC parts of SRC structural members and to develop a new method for predicting the ultimate strength of concrete encased SRC beam-columns.
The AIJ-SRC (1987) code calculates the beam flexural capacity by superposition method which neglects the composite action between the steel shape and the RC portion. But the ACI-318 code (1995) takes the SRC section as fully composite. In order to understand the actual behavior of SRC beams, some test results was collected to observe the strain distribution of SRC section. Then this research conducts an analytical study to determine the flexural capacity of a partially composite beam.
Besides, this study extends the design concept used in ACI code for eccentrically loaded RC columns to the design of SRC beam-columns. Based on the concept of Strength Superposition, the component materials strength are determined by using the AISC-LRFD specification (1993) and the ACI code. This research also uses a computer program BIAX developed by University of California at Berkeley to model the nonlinear material behavior of the steel and the concrete. Finally, the predicted values are compared with previous test results and the proposed design codes.
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