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Dr Xianghe Dai

Dr Xianghe Dai

BIOGRAPHY +

Dr Dai is a senior lecturer in Structural Engineering currently. Before he joined the University of Bradford in 2010, He worked in China and the UK as an engineer, senior engineer and research fellow in civil structural, construction and offshore engineering for more than 18 years. Dr Dai obtained his PhD in Civil Structural Engineering from the University of Manchester (UK) in 2004, MSc. in Civil (Hydraulic) Structural Engineering from Tsinghua University (Beijing, China) in 1988 and BEng. in Civil Engineering from Wuhan University (Wuhan, China) in 1985.

Teaching responsibilities
MAE 4008-B Skills for Engineers (Civil Engineering)
CSE 4002-A Construction Materials
CSE 6003-B Feasibility Study
CSE 6009-B Geotechnical & Civil Engineering Design
BEng Final Year Project Supervisor
MEng Advanced Project Supervisor
MSc Dissertation Supervisor

Research Interests
Structural behaviour experiments
Numerical modelling and analysis
Structural fire behaviour modelling and analysis
Structural dynamic analysis
Steel and steel/concrete composite structures
Light-weight steel structures
Concrete material property experiment and analysis
Development of sustainable structural systems and materials

GRANTS +

Current, and significant recent, funded projects

Reuse and Demountability using Steel Structures and the Circular Economy (RFCS, 2016-19. PI: Prof Dennis Lam):
The project will provide methodologies, tools and guidance to assist in design for deconstruction, particularly of composite steel structures for multi-storey buildings. This will lead to new shear connection systems for demountable composite construction, based on push tests and beam tests to verify composite action and to develop design rules.The whole life benefits of reusable structures will be quantified using LCA and circular economy indicators. Opportunities for greater standardisation and the use of BIM will be explored to facilitate deconstruction. A demonstration of demountability of the developed system is planned.

Structural and Fire Resistance of a Reusable Steel/Concrete Composite Floor System (EPSRC, 2016-19. Research group member. PI: Prof Dennis Lam):
This project aims to develop a reusable composite floor system to be used in steel/concrete composite structures. It is important that this method of construction is developed as a mainstream structural engineering solution, rather than limited to very special conditions, so as to maximize the benefits of design and construction of reusable structural components at the end of life. The proposed reusable floor system is a totally different form of construction, with new modes of structural behaviour that have not been investigated before. A complete rethink of composite floor structural and fire engineering design is necessary to ensure safety of the proposed floor system. Extensive new physical tests at ambient and elevated temperatures and in fire for the different components of the proposed floor system have been planned to identify the different modes of behaviour and failure of the system. Supplemented by extensive numerical simulations, this project will develop thorough understanding of the structural and fire performance of the new structural system to develop practical design methods. This project will be carried out in collaboration between the Universities of Bradford and Manchester, which have international leading experiences in composite structural behaviour and design at ambient temperature and in fire, and have dedicated and experienced research teams and experimental facilities.

Slim-Floor Beams - Preparation of Application rules in view of improved safety, functionality and LCA (RFCS, 2015-18. PI: Prof Dennis Lam):
The project will be the first to address the requirements for design of composite slim floor beams and to provide a holistic design approach with planned composite action between the steel profile and the concrete slab, considering all aspects of the technical design. The planned design rules will be based on adaptation of the current design principles and rules of Eurocodes. However specific parametric tests on the structural behaviour will lead to new design rules regarding the specifications of slim floor beam solutions. In addition to the design rules, recommendations and guidelines for practical application of slim floor systems will be developed.

Development of Improved Shear Connection Rules in Composite Beams (RFCS, 2012-15. Lead researcher. PI: Prof Dennis Lam):
This project has the objective of developing more realistic and more economic shear connection rules for modern long span composite beams, particularly with deeper deck profiles, which can be adopted as future revisions to EN 1994-1-1. A related factor is the amount of transverse reinforcement that is needed to control longitudinal splitting along the line of shear connectors. Membrane effects in floor plates provide a confining effect which can reduce the required amount of reinforcement, particularly for primary beams, but this is not taken into account. The objective is achieved by a test programme that is aimed at answering these practical questions in modern composite construction. The tests are analysed by advanced numerical models, which used realistic non–linear material properties, including the declining stress-strain relationship for concrete at high strain and the load –slip relationship of shear connectors. These models are used to develop new shear connection rules for un-propped beams, highly asymmetric beams, cellular beams and deeper deck profiles not covered by EN1994-1-1.

AWARDS AND RECOGNITION +

Member of the Institution of Structural Engineers (CEng, MIStructE), UK
Fellow of the Higher Education Academy (FHEA), UK
Henry Adams Award 2011, Institution of Structural Engineers, UK

INTERNATIONAL SCIENTIFIC ACTIVITIES +

Member of the Editorial Board of Journal of Civil Engineering Research
Reviewer for Steel and Composite Structures An International Journal
Reviewer for Journal of Engineering Mathematics
Reviewer for Journal: Thin Walled Structures
Reviewer for Advances in structural Engineering An International Journal
Reviewer of Journal of Advances in Mechanical Engineering
Reviewer for Journal: Structures
Reviewer for Journal: Engineering Structures
Reviewer for Journal of Constructional Steel Research

RESEARCH STUDENTS +

Currently co-supervising the following PhD candidates:
Mr Munir Mahgub, PhD, 2012, "CFT columns with self-compacting concrete"
Mr Naveed Rehman. PhD, 2013, "Demountable shear connectors for composite structures"
Miss Jie Yang, PhD, 2013, "Joint behaviour of concrete filled elliptical hollow sections"
Miss Amal El-Khoja, PhD, 2015, "Sustainable structural concrete"
Mr Musab AlHawat, PhD, 2016, "Steel reinforcement corrosion in concrete structures"

Welcome prospective PhD candidates join research groups in Civil Engineering Department at the University of Bradford UK.

RECENT PUBLICATIONS +

M Mahgub, A Ashour, D Lam and X Dai (2017), "Tests of self-compacting concrete filled elliptical steel tube columns". Thin-Walled Structures 110, p27-34.

You-Fu Yang, Lei Zhang, Xiang-He Dai (2016 accepted), "Performance of recycled aggregate concrete filled square steel tubular columns exposed to fire", Advances in Structural Engineering.

J. Yang, T. Sheehan, X. Dai, D. Lam (In Press, Sept. 2016 available online), "Structural Behaviour of Beam to Concrete-filled Elliptical Steel Tubular Column Connections". Structures.

You-Fu Yang, Zhu Wen, Xiang-He Dai (2016). "Finite element analysis and simple design calculation method for rectangular CFSTs under local bearing forces". Thin-Walled Structures 106, p316-329.

N. Rehman, D. Lam, X. Dai, A.F. Ashour (2016). "Experimental study on demountable shear connectors in composite slabs with profiled decking". Journal of Constructional Steel Research 122, p178-189.

Therese Sheehan, Xianghe Dai, Dennis Lam, Eleftherios Aggelopoulos, Mark Lawson, Renata Obiala (2016). "Experimental study on long spanning composite cellular beam under flexure and shear". Journal of Constructional Steel Research 116, p40-54.

Dai, X., Lam, D., and Saveri, E. (2015). "Effect of Concrete Strength and Stud Collar Size to Shear Capacity of Demountable Shear Connectors." J. Struct. Eng. (ASCE).

Lam D., Dai X.H., Kuhlmann U., Raichle J. and Braun M. (2015), "Slim-floor construction - design for ultimate limit state", Steel Construction (Design and Research) 8, p79-84.

Yang J., Sheehan T., Dai X.H. and Lam D. (2015), "Experimental Study of Beam to Concrete Filled Elliptical Steel Tubular Column Connections", Thin-Walled Structures 95, p16-23.

Dai X.H., Lam D. (2014), "Numerical Study on the Effect of Concrete Infill and Intumescent Coating to Fire-resistant Behaviour of Stub Elliptical Steel Hollow Sections under Axial Compression". Advances Steel Construction 10, p310-324.

Pagoulatou M., Sheehan T, Dai X. H., Lam D. (2014), "Finite element analysis on the capacity of circular concrete-filled double-skin steel tubular (CFDST) stub columns", Engineering Structures 72, p102-112.

Dai X. H., Lam D., Jamaluddin N. and Ye J. (2014), "Numerical analysis of slender elliptical concrete filled columns under axial compression". Thin Walled Structures 77, p26-35.

Jamaluddin N., Lam D., Dai X. H. and Ye J. (2013), "An experimental Study on Elliptical Concrete Filled Columns under Axial Compression". Journal of Construction and Steel Research 87, p6-16.

Dai X. H. (2013), "Structural Behaviour of Cold-formed Steel Cassette Wall Panels Subject to In-plane Shear Loads". Journal of Civil Engineering Research 3(2), p65-74.

Dai X. H. (2012), "Numerical Modelling and Analysis of Structural Behaviour of Wall-stud Cold-formed Steel Shear Wall Panels under In-plane Monotonic Loads". Journal of Civil Engineering Research 2(5), p31-41.

Sheehan T, Dai X.H., Chan T.M. and Lam D. (2012), "Structural response of concrete-filled elliptical steel hollow sections under eccentric compression". Engineering Structures 45, p314-323.

Lam D., Dai X.H., Han L.H., Ren Q.X. and Li W (2012), "Behaviour of inclined, tapered and STS square CFST stub columns subjected to axial load". Thin Walled Structures 54, p94-105.

Dai X.H., Lam D (2012), "Shape effect on the behaviour of axially loaded concrete filled steel tubular stub columns at elevated temperature". Journal of Construction and Steel Research 73, p117-127.

Wang Y.C., Dai X.H. and Bailey C.G. (2011), "An experimental study of structural fire behaviour and robustness of different types of steel joint in restrained steel frames". Journal of Construction and Steel Research 67(7), p1149-1163.

Dai X., Lam D. (2010) "Axial Compressive Behaviour of Stub Concrete-filled Columns with Elliptical Stainless Steel Hollow Sections". Steel and Composite Structures 10(6), p517-539.

Wang Y.C., Davison J.B., Burgess I.W., Plank R.J., Yu H.X., Dai X.H. and Bailey C. G. (2010), "The Safety of Common Steel Beam/Column Connections in Fire". The Structural Engineer 88(21), p26-35.

Dai X., Lam D. (2010). "Numerical Modelling of Axial Compressive Behaviour of Short Concrete-Filled Elliptical Steel Tube Columns". Journal of Steel Construction Research 66(7), p931-942.

Dai X.H., Wang Y.C., Bailey C.G. (2010), "Numerical Modelling of Structural Fire Behaviour of Restrained Steel Beam-Column Assemblies using Typical Joint Types". Engineering Structures 32(8), p2337-2351.

Dai X.H., Wang Y.C. & Bailey C.G. (2010), "A Simple Method to Predict Temperatures in Steel joints With Partial Intumescent Coating Fire Protection". Journal Fire Technology 46 (1), p19-35.

Dai X.H., Wang Y.C. & Bailey C.G. (2009), "Effects of Partial Fire Protection on Temperature Developments in Steel Joints Protected by Intumescent Coating". Fire Safety Journal 44 (3), p376-386.

Profile last updated on: 13-02-2017

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