1. ladder beam：32. 踏步(楼梯板的撑杆) strut bar | 33. 梯梁ladder beam | 34. 安装夹fixture
1. 摘要］列举了汶川地震中都江堰市某在建工程和东方汽轮厂档案楼等框架结构中的楼梯震害，分析了框架结构中楼梯的地震作用，揭示了梯段破坏和梯梁剪切破坏的形成原因。
Some types of stair damage caused by Wenchuan Earthquake in frame structures were presented. The seismic response of stairs was studied by concept analysis and calculation. And how the stair-plate is broken and the stair-beam is destroyed were explained.
2. 3.2 零件的机加工粗糙度Ra≤25μm，切边粗糙度≤50μm，梯梁周边不得有毛刺。
Roughness for parts machined: Ra≤25μm, trimming cut roughness ≤50μm; periphery of the girder should be void of burrs.