The free vibration analysis is conducted by using arch-frame structure model for brick arch floor, from this the local vibration and the whole vibration of the arch are studied.

对砖拱楼盖，采用拱框结构力学模型进行了自由振动分析，并探讨了局部振动和整体振动等同题。

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The crawl space beyond had a floor of unpainted, unvarnished wood, and narrow walls of brick. The three-foot ceiling was curved in an arch. It looked like a chimney lying on its side.

另一面的管道地板是没有漆过的木板，两边是窄窄的砖墙。三尺宽的天花板弯曲成拱形。看上去像一个横放着的烟囱。

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