Causes of Failure
1. Design Change of Walkway Supports
-single rod to double rod changed loading on joint
-occurred so rod wouldn’t have to be threaded
2. Did Not Meet Building Codes
-required that joints could support 151 kN
-designed so joints could support 91 kN
-one skywalk=288.9 kN; load on fourth floor joints=96 kN
-improper wielding and connections
-inadequate building materials