Cyclic Behavior of Foundation - Wall Connection in Cross Laminated Timber Shear Walls


Abstract eng:
Within the scope of sustainable construction, cross laminated timber (CLT) has a number of attributes that makes it an attractive alternative to build mid-rise buildings. Nevertheless, since the CLT elements are almost rigid panels, a critical matter of the seismic behavior of this construction system is the connections hysteretic response, because these links are responsible of giving a suitable ductility capacity and energy dissipation to the CLT structure subjected to seismic movement. Besides, the CLT panels in Chile are made of radiata pine timber, which is softer and lighter than the timber used worldwide to manufacture this structural material. This work presents the study of a foundation – wall connection by means of laboratory testing and numerical simulations. A set of hold down connectors and CLT walls are tested subjected to both quasi-static monotonic and cyclic loading protocols. Different fasteners configuration are analyzed, as well as load directions parallel and perpendicular to timber grain. Based on these laboratory results, two hysteretic constitutive laws (Saws models and pinching4 model) are calibrated using OpenSees simulations, taking into account the strength and stiffness degradation of the connectors, and the pinching behavior of the load – displacement curves. Results show good fitting between the simulated and the measured force - displacement curves for every connection tested and for both constitutive laws, but pinching4 model exhibits better adjustment than Saws model, particularly for the cyclic tests. Finally, using the calibrated numerical models of the hold down connectors, the cyclic behavior of a full scale 2.95 x 2.95 m CLT shear wall is explored. The simulation and test results show that the CLT panel rotates almost as a rigid body, and the nonlinear response of the connectors provides the ductility and energy dissipation for the wall under the cyclic displacement test, giving a displacement ductility over 3 with a drift capacity of almost 1,0%. Moreover, numerical model results suggest that the friction between wall and foundation should not be discarded or over simplified during structural analysis or design of CLT structures, because it provides an important part of the lateral load capacity of the wall.

Contributors:
Conference Title:
Conference Title:
16th World Conference on Earthquake Engineering
Conference Venue:
Santiago (CL)
Conference Dates:
2017-01-09 / 2017-01-13
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Text je chráněný podle autorského zákona č. 121/2000 Sb.



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 Record created 2017-01-18, last modified 2017-01-18


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