it could still be vibration - -doesnt' take much to kill a regular light bulb. Try a ceiling fan bulb in there. They have stronger filaments to withstand the vibration from the fan.
And as has been mentioned it could be too much current, except that it would be weird to get too much on one arm of the chandelier, and the right amount everywhere else. That's why if it's not vibration I'd first look at the wiring. If there's a frayed wire it could be shorting rapidly and causing the bulb to die.
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