网架结构的安全度及其抵抗连续性破坏的能力一直是众所关心的问题。美国哈特福体育馆网架的破坏说明在极限荷载作用下倒塌是可能发生的.但是最近在巴西圣保罗一展览中心网架所发生的意外事件说明这不一定会引起灾难。展览中心平面尺寸为260×260m,支承在25个支点上,是世界上最大的铝合金网架。其网格为 The security of the grid structure and its ability to resist continuous damage have always been issues of concern to the public. Destruction of the grid at the Hartford Stadium in the United States indicates that collapse under extreme loads may have occurred. However, recent accidents at an exhibition center in Sao Paulo, Brazil, indicate that this may not necessarily cause disaster. The exhibition center has a plane size of 260×260m and is supported on 25 fulcrums. It is the largest aluminum alloy grid in the world. The grid is