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From Table 2 of IS:4995 (Part-I) p. 9, the pressure ratio k value is more for emptying than filling. It is 1.0, 0.7 & 0.7 for granular, powdery & wheat flour material during emptying when compared to 0.5, 0.5 & 0.5 during filling. Hence, the horizontal pressure is always more during emptying.
@@Vasanth_Structural_Engineer As gap between material reduces after filling it, K value increases. During filling material is loosely available. Also pneumatic pressures will be applied for emptying flour, cement and fine materials. This also leads to increase in K value during emptying.
Yes. It is applicable for squat silos too, if the material to be stored is solid; as the Airy's theory is based on Coulomb's wedge theory. Please refer lecture @ 00:44:44 - Airy’s Theory for Analysis of Shallow Bins for further details. However, liquids retaining squat silos are not governed by Airy's theory. They need to be designed as cylinders subjected to Hoop / bursting tension force.
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How about bin not shallow bin filled with dry materials? How to calculate stresses
Dear sir, Why horizontal pressure is maximum during emptying please explain
From Table 2 of IS:4995 (Part-I) p. 9, the pressure ratio k value is more for emptying than filling. It is 1.0, 0.7 & 0.7 for granular, powdery & wheat flour material during emptying when compared to 0.5, 0.5 & 0.5 during filling. Hence, the horizontal pressure is always more during emptying.
@@StructuralEngineeringLectures Dear sir, Thank you. Can I know the reason behind the increase value of K for emptying
@@Vasanth_Structural_Engineer As gap between material reduces after filling it, K value increases. During filling material is loosely available. Also pneumatic pressures will be applied for emptying flour, cement and fine materials. This also leads to increase in K value during emptying.
Dear sir,
Thank you sir
Can Airy's theory be applied for Squat silos? or Squat Silos have a different theory for horizontal pressure?
Yes. It is applicable for squat silos too, if the material to be stored is solid; as the Airy's theory is based on Coulomb's wedge theory. Please refer lecture @ 00:44:44 - Airy’s Theory for Analysis of Shallow Bins for further details. However, liquids retaining squat silos are not governed by Airy's theory. They need to be designed as cylinders subjected to Hoop / bursting tension force.
@@StructuralEngineeringLectures Thanks for your response. If the filled material is Wheat for Squat silos, which theory should govern?
Yes. Please refer lecture @ 00:44:44 - Airy’s Theory for Analysis of Shallow Bins if it is filled with solid materials, not liquids.