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You draw segments with continuous condition like Makhzumi said. You can check your BMD and SFD and it will show you that as a continuous member. CSI programs (SAP and ETABS) do not analyze curved elements per se. Nevertheless, you can approximate a curved beam by using a series of straight segments. I mean, approximate an arc by using an open polygon. Be careful, if the lenght of the segments is shorter than their depht, concrete design will raise a shear overstress warning.