問（wèn）：薄壁焊管，鍍鋅薄壁焊管的豎向承載力怎麽計算呢？以上（shàng）計算都是簡單的計（jì）算，同（tóng）時還要考慮安全係數，甚至地震載（zǎi）荷，具體的情況分析請有經驗的專業工程師計算，以上資料僅供參考使用。
Question: How to calculate the vertical bearing capacity of thin-walled welded pipe and galvanized thin-walled welded pipe? The above calculation is simple, and safety factor, even seismic load, should be taken into account. Experienced professional engineers are required to calculate the specific situation. The above information is for reference only.
答： 1.計算壓應力，就是豎向壓力作用在薄壁焊管的橫截（jié）麵上所產生的壓應力。就（jiù）是壓力（單位N）除以薄壁焊管橫截麵（miàn）麵積（單位m平方）。隻（zhī）要壓應力小於材料的許用應力即可。
Answer: 1. Computational stress is the compressive stress produced by vertical pressure acting on the cross section of thin-walled welded pipe. It is the pressure (unit N) divided by the cross-sectional area (unit m square) of the thin-walled welded pipe. As long as the compressive stress is less than the allowable stress of the material. 2.薄壁焊管受壓，要計算穩定性。穩（wěn）定性的計算較為複雜。要看連接的方式是兩端固接還是一端固接另一端（duān）鉸（jiǎo）接。估計你不隻使用1跟立柱，所以可以簡單（dān）計算（suàn）成兩端固接。臨界（jiè）壓力簡單計算：P=(4*n*Pi^2*E*I)/[(L/2)^2]。n立（lì）柱的數量，pi^2就（jiù）是拍的2次方，E彈性模量，I慣性矩，L立柱長度。
2. The stability of thin-walled welded pipe under pressure should be calculated. The calculation of stability is complicated. It depends on whether the connection is fixed at both ends or hinged at the other end. It's estimated that you don't only use one post, so you can simply calculate it as a two-end fixture. Simple calculation of critical pressure: P=(4*n*Pi^2*E*I)/[(L/2)^2]. The number of n columns, PI ^ 2 is the second power of beat, E modulus of elasticity, I moment of inertia, L column length.
進入5月份後，一方麵是現貨市場去庫存化持續，另外一方麵（miàn）是（shì）上遊（yóu）薄（báo）壁焊管廠（chǎng）持續的高位粗鋼產量致使內部庫存較大，在下調出廠（chǎng）價的手段下，相對以前的低價薄壁焊管（guǎn）資源已經陸續（xù）發往（wǎng）現貨鋼市，預計近期可能集中到市，或許將對薄壁焊管廠剛剛提起的提升鋼價產生製約。
After entering May, on the one hand, the de-stocking of the spot market continues, on the other hand, the continuous high crude steel output of the upstream thin-walled welded pipe factory leads to a large internal stock. Under the means of lowering the ex-factory price, the low-cost thin-walled welded pipe resources have been sent to the spot steel market one after another. It is expected that they may be concentrated in the market in the near future, and perhaps the steel price just raised by the thin-walled welded pipe factory will be raised. Constraints arise.
