PhD Studentship: Durability Performance of Connections With Screws in Mass Timber Construction

2 weeks ago


Bristol, Bristol, United Kingdom University of Bristol Full time

The project:

The Net Zero emissions commitment of most countries by 2050 has renewed interest towards timber buildings. The use of mass timber has increased considerably in the UK in the past 15 years mainly for multi-storey residential buildings. Despite this surge in timber, further advances in the sector are hindered by high insurance costs related to uncertainties due to fire and moisture-induced degradation. Water leaks occur more frequently than fire as identified by the RISCAUthority, and incidents of timber damage from biodegradation are increasingly being reported. These are mostly related to trapped moisture between impervious membranes (e.g., waterproofing) and timber and water leaks from pipes.

Changes in moisture content can also result in reduced structural performance at the connectivity level. Swelling/shrinkage effects upon sudden changes in relative humidity can often lead to cracks. Rigid metal elements (e.g., angle bracket connections) can cause high internal stresses due to swelling restriction when timber is left exposed to rainfall during the construction stage. These high internal stresses often lead to withdrawal failure of screws.

This research project will study the performance of timber connections with screws in both glue laminated and cross laminated timber due to hygrothermal effects. An experimental programme will be conducted to assess the load capacity and stiffness of screw connections. The experiments will range from small-scale testing of single connectors to medium-scale testing at the connectivity level. Of interest is to simulate specific moisture/loading histories as identified on site and during the operational life of a timber building. An extensive Finite Element (FE) modelling programme will be conducted to help interpret experimental results and identify the unknown diffusion and mechanosorptive material parameters of timber.

The project seeks to inform current design guidelines and technical specifications on the load capacity of timber screw connections accounting for the presence of moisture in collaboration with Rothoblaas.

How to apply:

Prior to submitting an online application, you will need to contact the project supervisor to discuss.

Online applications are made at Please select Civil Engineering PhD on the Programme Choice page. You will be prompted to enter details of the studentship in the Funding and Research Details sections of the form.

Candidate requirements:

Applicants must hold/achieve a minimum of a pass at master's degree level (or international equivalent) in a science, mathematics or engineering discipline. Applicants without a master's qualification may be considered on an exceptional basis, provided they hold a first-class undergraduate degree. Please note, acceptance will also depend on evidence of readiness to pursue a research degree.

If English is not your first language, you need to meet this profile level:
Profile E
Further information about English language requirements and profile levels.

Funding:

Minimum tax-free stipend at the current UKRI rate is £18,622 for 2023/24.

For eligibility and residence requirements please check the UKRI UK Research and Innovation website

Contacts:

For questions about the research topic, please contact Dr Eleni Toumpanaki at

For questions about eligibility and the application process please contact Engineering Postgraduate Research Admissions admissions-

£18,622. UKRI rate


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