SIPs And Seismic Performance

SIPs are a strong structural panel building compound utilized in residential houses and commercial constructions for different parts of structure. SIPs have a history of performance in seismic events. In particular, several of structural insulated panels constructions were located close to the epicenter of 6.9 scale earthquake that struck Kobe, Japan in 1995. The whole look of these structures after the earthquake showed that the inherent performance of SIPs in such zones is exceptional.

SIPs are as a rule known for good structural integrity, temperature regulation and better insulating capacity. Their tighter building envelope implies not so much air can get into and out of the construction, enabling not so extensive heating and cooling within. This, in turn, makes for a smaller energy output. The main advantage of SIPs is that in addition to their good-quality composition, Structural Insulated Panels make for quite fast construction times.

SIPs improve their shear strength from the utilizing of outer facings of 7/16″ OSB produced in conformance with the PS2 standard for sheathing. Each SIP wall panel is linked to ground top plates, and vertical boundary members with fasteners, typically 8d nails. The 8d nails give the transfer of the shear loads from the OSB facings to the wood plating materials while the bond of the OSB to the EPS core provide resistance for the OSB from buckling. Such sort of performance is alike to conventionally built OSB sheathed shear walls where the OSB gives shear opposition by utilizing fasteners to transport shear loads to the framing members.

self build have been evaluated side by side with OSB sheathed conventional walls. Testing has been conducted by the leader in the development of shear wall creation data for light frame walls, APA – The Engineered Wood Association. Testing consisted of creating traditional OSB sheathed 2X shear walls and comparing the functioning to Structural Insulated Panels.

Testing was conducted following a seismic check protocol developed by the Structural Engineering Association of Southern California (SEAOSC). The test consists of making a simulated seismic situation to a shear wall and recording the response. The test protocol includes 72 cycles of loading for the shear wall. The outcoming loads and deflection for the ordinary shear wall and the Structural Insulated panel wall were nearly identical.

It is recommended that SIPs are alike to ordinary light frame shear walls with OSB sheathing for performance in seismic zones with proper engineering of links and load transfer.

Future study by industry is anticipated to assist develop the market for SIPs in high seismic regions.

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