For the circumferential stress check at the support location, the gasket serves to reinforce the structure; when calculating the flexural section modulus with the effective thickness of the gasket taken into account, could its length be 8Ra or L/2?
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For the circumferential stress check at the support location, the gasket serves to reinforce the structure; when calculating the flexural section modulus with the effective thickness of the gasket taken into account, could its length be 8Ra or L/2? The length of the shimming plate is limited.
It is usually not possible to directly obtain 8Ra or L/2. When calculating the circumferential stress at the support location, if the gasket serves a reinforcing purpose, the length of the gasket to be included in the effective cross-sectional modulus should be its actual effective reinforcing length, rather than being based on the overall length of the cylinder (such as 8Ra or L/2). In practical design: 1. The length of the gusset plate is usually much smaller than the value specified in the codes for the overall reinforcement section (such as 8Ra or half the length of the cylindrical section of the vessel). 2. The stiffening effect of the gusset plate exists only within its actual range; therefore, when calculating the bending modulus of the cross-section, only the effective thickness within the length range of the gusset plate should be taken into account. 3. If values are chosen beyond the actual reinforcement range of the shimming plate (e.g., 8Ra or a longer length), it will significantly overestimate the reinforcement effect of the shimming plate, which does not reflect the actual situation. In conclusion, the limited length of the shimming plate means that when calculating the effective thickness and flexural section modulus, it is generally not possible to use a length of 8Ra or L/2; instead, the actual effective length of the shimming plate must be used. .