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Long-term performance of post tensioned cross laminated timber (CLT) shear walls: hygro mechanical model validation and parametric analysis

Zeng Xiuzhi, He Minjuan, Li Zeng, Luo Qi

Archives of Civil and Mechanical Engineering

2022

Vol. 22, no. 2

art. no. e68, 1--18

Post-tensioned cross-laminated timber (CLT) shear wall structure is an innovative solution of earthquake resilient structures. The prestressing force of post-tensioned CLT shear walls remarkably affect the structural seismic performance. Due to the time-dependent elastic, creep, and environmental deformation of wood, the prestressing force will change over the service life of the structure. In this study, a hygro-mechanical numerical model for simulating the time-dependent performance of post-tensioned CLT shear walls was established. Moisture diffusion analysis, time-dependent deformation calculation and prestressing force updating were incorporated in the proposed model, which was further validated based on experimental results. Subsequently, a series of parametric analysis was conducted to study the effect of various material properties, geo metric characteristics, environmental conditions and prestressing forces on the long-term performance of post-tensioned CLT shear walls. The analytical results of the key parameters such as the CLT shear wall dimension, the initial prestressing force, and the environmental temperature and relative humidity were presented and discussed. Practical suggestions for enhancing the long-term safety of post-tensioned CLT shear wall structures were proposed.

Pre-stress losses in FRP pre-stressed reinforced concrete – subject overview

Przygocka M., Kotynia R.

Archives of Civil Engineering

2018

Vol. 64, nr 4/II

257--268

This paper discuss the issue of pre-stress losses which occur in the FRP prestressed concrete structures. The prestress losses consist of immediate losses just after pre-tensioning of the FRP composite and time-dependent losses. Prestress losses are affected by different factors as strength properties of used materials, ambient temperature, humidity, UV radiation, bond between the FRP material and RC specimen, type of anchorage and creep of prestressing system. Two types of tests can be found in the available literature: material samples subjected to sustained uniaxial tension which verify the relaxation of FRP tendons (Wang et al., Sasaki and Nishizaki, Shi et al and Oskouei and Taleie) and flexural tests of RC beams strengthened with pre-tensioned FRPs (Wang et al.). Authors considered different types of composites: carbon (Wang et al, Sasaki and Nishizaki, Oskouei and Taleie), aramid (Sasaki and Nishizaki, Oskouei and Taleie), glass (Sasaki and Nishizaki), vinyl (Sasaki and Nishizaki) and basalt (Shi et al.).