We report the loading experiment of 36m span wooden truss bridge built in May 1990. Because of the deterioration of some members, this pedestrian bridge was replaced by steel bridge in December 2003 without the verification of residual strength performance. All of the wooden members, steel connecti...
led半户外显示屏与户外led显示屏的九大区别: 1.户外led显示屏应完全防水,即大于65,完全不需要半户外。 2、目前市场上的户外led显示屏在套件中首先填充了胶水,因此防水性能特别高,与户外环境设计相对应。半户外led显示屏没有这个过程,所以防水性能不如户外led显示器。 3、完全符合防水等级设计,半户外led显示屏不需要...