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Which of the following statements is/are true for a natural building material like bamboo during an earthquake? i) It will result in a flexible structure, however needs to be designed stiff enough to resist earthquake forces. ii) Since it has a good specific strength (MPa/kg), the earthquake resistance is better. iii) Being light in weight, it will experience lesser earthquake forces

Which of the following statements is/are true for a natural building material like bamboo during an earthquake? i) It will result in a flexible structure, however needs to be designed stiff enough to resist earthquake forces. ii) Since it has a good specific strength (MPa/kg), the earthquake resistance is better. iii) Being light in weight, it will experience lesser earthquake forces Correct Answer ii) and iii)

Resistance against earthquake is inversely related to stiffness. Higher the stiffness, resistance against vibration will be less.

∴ Statement ‘1’ is False.

Specific strength is the strength to weight ratio. Among compressive, tensile and bending strength bamboo has maximum tensile strength and has low density because of light weight that provides resilience i.e. it can store vibration energy to large extent and hence, bamboo is enable to withstand tremors.

∴ Statement ‘2’ is True.

Earth quake force acting on anybody is the product of mass and effective acceleration. For a given effective acceleration, earthquake force is directly proportional to mass of an object. Higher the mass, higher the force. Since bamboo is light weight structure as compared to other materials like steel, it will experience lesser earthquake forces.

∴ Statement ‘3’ is True.

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