Cross - check the main roof truss roof installation quality of the surface is not perpendicular to the vertical center two blocks ; roof surface pressure chord of the roof truss vertical bending side , we must ensure that such errors do not exceed the allowable deviation to ensure roof stability and comply with the design requirements of the state by force 屋架安装质量主要检查屋架跨中对两支座中心竖向面的不垂直度;屋架受压弦杆对屋架竖向面的侧面弯曲,必须保证上述偏差不超过允许偏差,以保证屋架符合设计受力状态及整体稳定要求
Failure modes of two staggered truss steel framing buildings , the results indicate the plastic hinges mainly formed in truss members , especially concentrated to the vierendeel panel . it means the vierendeel panel in the center of the truss can provide significant ductility in the structural response and the failure mode is suitable for our performance services 指出分析所得的塑性铰分布图中，塑性铰大量分布在桁架腹杆和中间空腹节间弦杆处，而柱中塑性铰发展则很少，这样的破坏模式符合次要构件破坏，而主要受力构件基本不破坏的抗震设计思想。
