Since 2010 twelve post-tensioned timber (Pres-Lam) buildings have been constructed throughout the world. In high seismic areas Pres-Lam technology typically combines unbonded post-tensioning tendons and supplemental damping devices to provide moment capacity to beam-column, wall-foundation or columnfoundation connections. Over time creep within the timber elements leads to losses in post-tensioning force reducing the connection moment capacity. This paper analyses how different post-tensioning loss scenarios, depending on the beam-column joint detailing, impact on the building seismic response. Two case study buildings were designed and investigated using the Acceleration-Displacement Response Spectrum (ADRS) method and Non-Linear Time History Analysis (NLTHA) to predict seismic performance. These buildings were considered to be located in areas of high and low seismic risk, leading to design with and without the use of damping devices, respectively. The results show that the building with additional damping responded with similar peak displacements even under extreme loss scenarios. While when supplemental damping was not used, peak displacements increased significantly with post-tensioning losses.

The implications post-tensioning losses on the seismic response of Pres-Lam frames / Granello, G; Palermo, Ag; Pampanin, S; Smith, T; Sarti, F. - In: BULLETIN OF THE NEW ZEALAND SOCIETY FOR EARTHQUAKE ENGINEERING. - ISSN 1174-9857. - 51:2(2017), pp. 56-79.

The implications post-tensioning losses on the seismic response of Pres-Lam frames

Pampanin S;
2017

Abstract

Since 2010 twelve post-tensioned timber (Pres-Lam) buildings have been constructed throughout the world. In high seismic areas Pres-Lam technology typically combines unbonded post-tensioning tendons and supplemental damping devices to provide moment capacity to beam-column, wall-foundation or columnfoundation connections. Over time creep within the timber elements leads to losses in post-tensioning force reducing the connection moment capacity. This paper analyses how different post-tensioning loss scenarios, depending on the beam-column joint detailing, impact on the building seismic response. Two case study buildings were designed and investigated using the Acceleration-Displacement Response Spectrum (ADRS) method and Non-Linear Time History Analysis (NLTHA) to predict seismic performance. These buildings were considered to be located in areas of high and low seismic risk, leading to design with and without the use of damping devices, respectively. The results show that the building with additional damping responded with similar peak displacements even under extreme loss scenarios. While when supplemental damping was not used, peak displacements increased significantly with post-tensioning losses.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1182861
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