With the influence of so many cracks, the strength, stiffness and stability of the umbrella arch is decreased greatly, which endangers the operation of underground power house.
数目众多的纵、横向裂缝已大大削弱了混凝土顶拱的强度、刚度及稳定性，危及地下厂房的安全运行。
The umbrella shaped cover is one of the fixed tank covers, which is characterized between the conical cover and the arch cover .
伞顶是介于锥顶与拱顶之间一种固定式罐顶结构形式。
The umbrella shaped cover is one of the fixed tank covers, which is characterized between the conical cover and the arch cover .
伞顶是介于锥顶与拱顶之间一种固定式罐顶结构形式。
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