its span increases
它的跨度增大
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The shear lag effect in frame-tube structures can be neglected when the ratio of beams span to height increases to some degree, and its behaviors comes close to the behaviors of frame structures.
当框筒结构裙梁跨高比增大到一定程度以后，剪力滞效应就可以忽略，结构的受力性能与框架相近。
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