CLT Innovations
Thursday, March 31, 2011 at 8:09AM A major concern with a CLT archetype building in a seismic event is that the accelerations at upper levels of a multi-story CLT structure are extremely high due to the stiffness of the panels. Thus, we must explore details that increase the ductility to the structure. Damping dissipates energy thereby decreasing the acceleration the structure experiences in an earthquake and lends ductility thereby increasing the response modification coefficient, R.
Figure 1 is an idea for a connection between shearwalls floor to floor using a steel tension rods placed within the CLT panels during manufacturing. The end of the rods would be threaded. A coupler would be used to join the rods. The center of the coupler would have a shock absorber that effectively damping the shearwall.
Figure 2 is an idea I have for modular construction where there is both a ceiling and floor panel at each story. Hysteretic damping mechanisms would seismically isolate each floor or each couple of floors.
Jerry, provided me with an engineering challenge. He wants his CLT manufacturing facility to showcase innovative CLT construction. The assembly line area is a very large open space. Usually this space would be roofed using a spaceframe or very large steel trusses. Figure 3 is a concept drawing for a CLT roof structure that could span long distances.
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