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Friction-based connectors with wooden dowels for timber shear walls: Shake table and time-dependent test
Abstract Prestressing in wood connection, due to frictional forces, improves mechanical properties of the connection. This paper presents novel friction-based connectors, and corresponding tests at the connection and system levels. The friction-base connector is composed of a softwood or hardwood dowels inserted into the wood-based material and tightened to generate frictional force. Long-term performance was evaluated by stress relaxation tests and time-dependent connection tests. To evaluate dynamic performance of shear walls with friction-based connectors, shake table tests were conducted. The shake table tests showed that the restoring force characteristics of the wood friction shear walls were bilinear reflecting the behaviors of the friction-based connectors. The strength degradation of the wood friction shear walls due to cyclic input was small that more seismic inputs could be applied before any significant damage to the wood friction shear wall. Results of stress relaxation tests, for periods of 1 to 3 years, showed that the stresses were maintained at 70–90% under uncontrolled environment. On the other hand, the results of time-dependent connection tests, for 1 to 6 years, showed high initial clamping stresses caused large performance loss, but high performance could be maintained when tightened below the allowable stress for sustained loading.
Highlights Experimental studies of friction connectors using wooden dowels were conducted. Shear walls with the connectors showed high seismic performance in shake table tests. Long-term performance was evaluated by stress relaxation and time-dependent connection tests. Experimental results suggest the connectors have a high potential for practical use.
Friction-based connectors with wooden dowels for timber shear walls: Shake table and time-dependent test
Abstract Prestressing in wood connection, due to frictional forces, improves mechanical properties of the connection. This paper presents novel friction-based connectors, and corresponding tests at the connection and system levels. The friction-base connector is composed of a softwood or hardwood dowels inserted into the wood-based material and tightened to generate frictional force. Long-term performance was evaluated by stress relaxation tests and time-dependent connection tests. To evaluate dynamic performance of shear walls with friction-based connectors, shake table tests were conducted. The shake table tests showed that the restoring force characteristics of the wood friction shear walls were bilinear reflecting the behaviors of the friction-based connectors. The strength degradation of the wood friction shear walls due to cyclic input was small that more seismic inputs could be applied before any significant damage to the wood friction shear wall. Results of stress relaxation tests, for periods of 1 to 3 years, showed that the stresses were maintained at 70–90% under uncontrolled environment. On the other hand, the results of time-dependent connection tests, for 1 to 6 years, showed high initial clamping stresses caused large performance loss, but high performance could be maintained when tightened below the allowable stress for sustained loading.
Highlights Experimental studies of friction connectors using wooden dowels were conducted. Shear walls with the connectors showed high seismic performance in shake table tests. Long-term performance was evaluated by stress relaxation and time-dependent connection tests. Experimental results suggest the connectors have a high potential for practical use.
Friction-based connectors with wooden dowels for timber shear walls: Shake table and time-dependent test
Wakashima, Yoshiaki (Autor:in) / Ishikawa, Koichiro (Autor:in) / Shimizu, Hidemaru (Autor:in) / Kitamori, Akihisa (Autor:in) / Matsubara, Doppo (Autor:in) / Hanai, Shingo (Autor:in) / Tesfamariam, Solomon (Autor:in)
Engineering Structures ; 307
08.03.2024
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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