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。
To install the crane span before installation, camber, level of metal structure of main girder bending, trolley rail height difference, gauge deviation, diagonal bridge survey.
安装前要对起重机安装跨度，金属结构主梁的拱度、水平旁弯，小车轨道高低差、轨距偏差，桥架对角线等进行测量。
For the relatively smaller loads, the economical height-to-span ratio scopes of space steel trusses and space prestressed steel trusses can be found.
对于相对较小的荷载，可以找到立体钢桁架及立体预应力钢桁架的经济高跨比范围。
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