Actual SSG System Performance Post-Quake
The PSU research mentioned earlier was conducted using a single-component medium-modulus structural silicone (GE SCS2000) on “stick" built curtain wall units. The projects reviewed in this paper were constructed using a high modulus two-component structural silicone on “unitized" curtain wall systems. Unitized systems are currently the more prevalent assembly method for SSG systems, and are built in a factory and transported to the jobsite for modular
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type installation by interlocking with adjacent units, while “stick" built systems are installed piece-by-piece on the job site.
Santiago is currently home to Latin America’s tallest tower (Torre Costa – nera at about 300 m) as well as several dozen towers exceeding 30 stories, many of them constructed with SSG curtain wall systems. Yet, considering the magnitude of the event and the extent of overall damage, there was reported favorable performance of modern buildings and facades. Several buildings with SSG facades were surveyed in the aftermath of the 2010 Chilean earthquake with most of them showing little or no damage even though the magnitude of the quake was the fifth largest in recorded history. To more completely assess the good performance observed of SSG systems post-quake, it is important to recognize the “behind the scenes" value of the Chilean Seismic Building Code, which is reviewed below.