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在设计给水过河拱管(圆弧形拱管、折线形拱管)时,计算风荷载需要拱管平面外的自振周期,才能确定风振系数β_z。在现有文献资料中尚未见有裸体拱管平面外自振周期的计算。本文从理论上详细推导并给出工程中常用管型自振周期的计算公式,同时也给出平直形过河钢管的自振周期计算公式,可供工程设计应用。
In the design of water supply over the river arch pipe (arc-shaped arch, arch-shaped arch pipe), the calculation of wind load requires arch tube outside the natural period of vibration in order to determine the wind vibration coefficient β_z. In the existing literature has not yet seen naked arch tube out of plane period of the natural vibration calculation. In this paper, the formula of natural cycle of tubular natural gas in engineering is derived and given in detail, and the formula of natural period of flat-shaped cross-river steel pipe is also given, which can be used in engineering design and application.