House of natural resources – modal vibration tests and long-term monitoring (original) (raw)

2021

Abstract

This report presents an innovative case-study building implementing four novel structural systems implementing innovative hardwood materials. The main structural system is a post-tensioned timber frame with columns in ash glulam and beams in hybrid ash-spruce glulam. The beams and columns are connected via a horizontal post-tensioning cable, which creates a semi-rigid moment frame. Furthermore, three different innovative slab systems are implemented inside the building, first a timber-concrete composite slab with beech laminated veneer lumber (LVL), then a hollow-core timber-concrete composite slab and third a bi-axial timber slab with beech cross-laminated timber (CLT) and beech LVL lamellas. Test results from modal vibration tests during four different construction stages are presented. The results showcase the influence of the different structural systems on the dynamic properties of the building. Fundamental frequencies, damping ratios and mode shapes are derived from different sensor systems. Additionally, the monitoring data from a seven-year long monitoring campaign are presented. The most relevant physical quantities presented are for example, the long-term development of the post-tension force within the post-tensioned timber frame, or the long-term deformations of the bi-axial timber slab. The monitoring campaign illustrates that the building's long-term performance is generally equal to the long-term predictions, except for the deformations of the bi-axial beech slab, which will be investigated further

Eleni Chatzi hasn't uploaded this paper.

Let Eleni know you want this paper to be uploaded.

Ask for this paper to be uploaded.