Concrete buttress DAMS when subjected to severe shaking have developed horizontal cracks at the elevation high in the DAMS where the downstream buttresses intersect the vertical "chimney" section.
混凝土伏扶壁大坝受到强震时，容易在大坝高处形成裂缝，在那里下游坝面扶壁横贯垂直的“烟筒”部分。
In this paper, a cross-section function of brick chimney has been assumed based on traditional hypothesis and a variable coefficient free-vibrating differential equation has been derived.
本文假设了接近砖烟囱实际截面面积的函数，推出了一个变系数的自由振动微分方程。
It is simple and convenient and of speediness, and good quality control using the variable cross-section climbing form for chimney construction.
用变截面提模施工烟囱，简单易行，设备简便，速度快，质量有保证。
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