Foundation depths deeper than 10% + 4 feet (1.2 m) would only be tested if the initial two load tests justified the need. The three steel structure tests would provide enough evidence to develop ...

The C5 design team found a clever solution to this problem: It made the new frame out of a 14-foot-long, 3mm-thick steel tube. The tube was closed off at each end and filled with high-pressure water.

2014 Chevrolet Silverado, GMC Sierra Rely On High-Strength Steel For Frame Integrity . By Manoli Katakis. January 10, 2013 7:02 am . Facebook Twitter LinkedIn Pinterest Email Print. 10 ...