Slcad easily adapts to the wide range of technologies used for line surveys such as total station instruments . it accepts survey data in both the plan and the profile coordinate systems . survey data can be keyed in , or can be electronically imported from a survey data file . slcad has a customizable data import routine that can read a wide range of survey data formats 控制尺寸调整了，修改一下前面输入的控制尺寸的数据，后续生成的杆件和图形自动就随之变化，包括尺寸标注都自动随之移动节点板设计改变了，相关的其余的杆件会自动调整并且材料表会自动修改！
Abstract : in this paper , a new simple method is put forward to on - line survey and analyse the real - time response of bridges loaded under random vehicles and people . based on linear elastic hypothesis and finite element method , the dynamic whole displacement state and load of the bridge can be obtained through surveying partial displacements , so the problem that load is unknown and difficult to determine when calculating is solved in a sense . this method is adap ted to girder bridge , arch bridge , cable - stayed bridge and suspension bridge . through the instrumentality of ways and means in this treatise , a real - time system to survey and analyse a working bridge can be established 文摘:在线弹性假设基础上，根据有限元理论和桥梁随机车辆(行人)荷载的特点，讨论并提出了一种通过监测部分位移，计算桥梁其余位移和桥面荷载的简化分析方法，解决了桥梁在随机车辆(行人)荷载作用下的荷载确定问题，建立了动位移和等效节点荷载的有限元列式.该方法为桥梁结构的在线监测和实时分析提供了理论基础，适用于连续梁桥、拱桥、斜拉桥和悬索桥等桥梁结构形式，具有实际应用价值
