| Abstrakt: |
Semielliptical beams were studied through bisecting the secondary minor (short) axis. The finite element method was used to analyze sixteen reinforced concrete semielliptical deep beams. The parameters that were taken into account were beam height, concrete compressive strength, number of supports and the change of loading type from concentrated to uniform. It was found that with an increase in the height by 5.6-16.7%, the positive, negative and torsional moments besides loading capacity increase by about 4-18.6%, 4-18.7%, 4-18.6% and 4-18.7%, respectively. When concrete compressive strength increase by 14-43%, positive, negative and torsional moments besides load capacity increase by about 6.9-18.6%, 6.8-18%, 6.8-18.4% and 7.1-19%, respectively. Positive, negative and torsional moments decrease by about 28.1-33.3%, 28.6-25.2%, and 61.7-57.7%, respectively, when increasing the number of supports from 3 to 7, while the loading capacity increases by about 73.8-85.7%. When changing the type of loading from central concentrated to uniformly distributed one, the negative and torsional moments increase by about 1.4-16.4% and 1.3-2.7%, respectively while the positive moments decrease by about 5.6-22.3%. As for the loading capacity, it increases by 126.2% and 14.3% under partial loading of 20%, 50% of span length, respectively, but it decreases by 73.8% under full span loading. From other side, increasing the compressive strength of concrete leads to an increase in the strength of its section, which leads to an increase in the load capacity and a decrease in the deflection. Also, increasing the number of supports reduces the length of the loading spans, which reduces the moments generated as a result of loading, which leads to the same result. Finally, changing the load from central concentrated to uniformly distributed leads to a decrease in the generated moments because of it, and consequently the load capacity increases and the deflection decreases. [ABSTRACT FROM AUTHOR] |
