In the sewer pipe with high energy slope, there always occurs the high velocity flow, and its hydraulic calculation is beyond the range of wastewater design specification.
大比降排水管水流通常为高速水流，其水力设计已经超过排水设计规范范畴。
The stability calculation of chords on open lattice beyond the main truss plane is discussed in the article. A calculation example is presented.
本文讨论了敞开式桁架弦杆的平面外稳定性计算方法，并给出了计算实例。
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