How are the initial overall membrane stress and initial bending stress of non-standard container supports calculated? ? ?
Thread Content
When calculating non-standard ear-type supports, in accordance with clause 3.6 of the standard JB/T4712.3-2007, the stress limitation condition specified in 3.6.3.2 applies: a) The overall membrane stress Pm caused by internal pressure； b) Primary local membrane stress Pl caused by the support moment ； c) The primary bending stress Pb caused by the support moment. How do these 3 stresses arise, how are they calculated? Does anyone know? ? ?
a is generated by the pressure inside the cylinder; it has nothing to do with the supports. It’s been explained clearly, but you didn’t understand it correctly. Because if the book you’re reading doesn’t provide the calculation method, then analyze it. There are relevant calculations for this standard.
It is recommended to take a look at Mechanics of Materials and Theoretical Mechanics. 1. It is the overall film stress generated by internal pressure; in other words, it is calculated in accordance with GB150.3. 2. The load on the equipment is determined based on its quality (taking into account different operating conditions such as the equipment being empty, under operation, or during hydrostatic testing), while also considering wind loads, horizontal forces during earthquakes, as well as the stresses resulting from forces and moments at the supports. Relevant calculations can be found in the comprehensive book on chemical processing equipment – Vessels.
Your reminder has further deepened my understanding of item A. The key question now is to find out whether there is a formula for calculating the stress in abc. If it can be calculated analytically, then were the custom ear-type support software programs developed by others also based on such calculations?
Thank you. As you requested, I’ve started learning *Mechanics of Materials* – it’s basic textbook content; I think this will help me understand things more clearly. What I still don’t understand is how to calculate the three values of abc related to the stress limitation conditions, and what their relationship is with section 3.6.3.1 of standard JB/T4712.3-2007, which deals with \"the calculation of stresses in the cylinder of the vessel at the supports\" Both refer to the same stress; it’s just that the symbols used are different. What’s going on here?
Why make it so complicated? The standards you’re referring to come with calculation methods and examples
Film stress refers to the hoop stress and axial stress; therefore, Pm is the larger of those two values, and the same applies to the others.