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Which of the following load combination is not considered for design of roof trusses?(a) Dead load + crane load(b) Dead load + wind load(c) Dead load + earthquake load(d) Dead load + live load + wind loadThis question was posed to me by my school teacher while I was bunking the class.This intriguing question originated from Gantry Girders & Design of Industrial Buildings topic in chapter Gantry Girders, Design of Plate Girders & Industrial Buildings of Design of Steel Structures

Answer»

Correct answer is (c) DEAD load + earthquake load

The best I can explain: Earthquake loads are not significant for roof trusses because of the SMALL self weights. The following load combinations can be CONSIDERED : (i) Dead load + snow load, (ii) Dead load + partial/full live load, (iii) dead load + live load + internal POSITIVE air pressure, (iv) dead load + live load + internal SUCTION air pressure, (v) dead load + live load + wind load.



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