Q：用户疑问， 箱室腹板输入按照自由输入，但却没有按照等间距输出断面图，原因在哪？
答：原因在于用户在纵向数据中选择了构造线，纵向数据-选择构造线之后，主梁的线型根据选择的构造边线进行处理。
如果需要得到箱室等宽的断面，可以对于平面图的腹板线型进行一定处理，下面的线型包含道路中心、结构上下边线、墩位线。
用户希望得到的箱室宽度为4*3640，可以用钢梁变宽度——选择腹板线来实现此需求，有以下两种方法实现：
方法一：对于上下边线进行偏移，内偏悬臂宽度3000，偏移后采用曲线垂直插入功能，对于曲线进行等分，输入3个插入线等分为4份，然后用选择构造线，选择腹板线的方式得到构造线，效果如下：
方法二：对于上下边线进行偏移，内偏悬臂宽度3000，偏移后采用曲线插入功能，选择上下侧边线对于曲线进行等分，输入3个插入线等分为4份，然后用选择构造线，选择腹板线的方式得到构造线，效果如下
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