bracket invalidation造句

• In the 5th chapter , single steel bracket of slts under violent external load is supposed to be invalid , structural response and bearing capacity under dead load at that moment of bracket invalidation is analyzed
  在第五章中，假定在外荷载的作用下，网架结构的单个支撑钢牛腿出现失效，研究在牛腿失效瞬时结构在恒载作用下的承载能力和工作状态。