Seeking help with the calculation of tank strength

Thread Content

When calculating the strength of the header, if the hole spacing is greater than or equal to the minimum pitch s0, hole bridges can be ignored and the holes can be treated as individual ones. When calculating a certain problem, there are small-diameter holes arranged offset from each other and large-diameter holes arranged longitudinally; the spacing between the small-diameter holes is all less than s0, and the issue of hole bridges weakening the structure must be taken into account. For large-diameter holes, the hole spacing is greater than s0, and the weakening effect due to hole bridges is not considered. The questions are as follows: (1) When calculating the theoretical wall thickness, the reduction factor is taken as the minimum value among the longitudinal, diagonal, 2 times transverse, and weld reduction factors. In the previous problem, the pore bridges in the large pores were not taken into account; is it necessary to determine their longitudinal weakening coefficient for use in comparing with the theoretical wall thickness weakening coefficient? Or is the attenuation coefficient simply taken as the minimum value among the several attenuation coefficients of the small holes? (2) The minimum reduction coefficient φs is used to determine whether hole reinforcement is necessary. If φs > 0.4, hole reinforcement is required, and the maximum pore size is determined using a connectivity graph; if it is less than or equal to 0.4, no hole reinforcement is necessary. Is it possible, as in the question above, to take into account the weakening effect of hole bridges for small holes while ignoring it for large holes, and φs