ANALYSIS OF STRUCTURAL BEHAVIOR OF GLULAM BEAM OF 50 METRE PEDESTRIAN BRIDGE SUBJECTED UNDER VERTICAL

LIVE LOAD BASED ON BD37/01 USING FINITE ELEMENT

SOFTWAREPRESENTER : NOR LATIFAH BINTI CHE AWANGSTUDENT ID : 2009852656SUPERVISOR : IR. MUHD SALMIZI BIN JAAFARPANEL 1 : PN. ROZAINA BINTI ISMAILPANEL 2 : EN. AMIRUDDIN BIN MISHAD

INTRODUCTIONMostly in Malaysia,

the pedestrian bridges were built

from composite beam, steel beam

and reinforced concrete beam.They

are usually the fastest way and easily to built

however they also can contribute to

unsustainable beam and no longer long lasting pedestrian

bridges such as the reinforcement of the

concrete which is the steel without

difficulty to corrode and damaged

Glulam or glue laminated timber is used in construction of structure such as building or bridges instead use of steel

or reinforced concrete. Glulam

used for structural as a green concept towards the green technology. It also

suitable for sustainable

development for pedestrian bridge

because it has higher tensile

strength compared to the steel

PROBLEM STATEMENT

There are some disadvantages of the conventional bridge such as

steel bridge and will contribute to higher greenhouse gas emission in manufacturing the steel to produce the beam. They also are costly in

manufacturing and to make sure the bridge are long- lasting. They also can corrode easily if no precaution

action will be taken

Hence, the glulam bridge beam can overcome the disadvantages of the

conventional bridge by reducing the cost in manufacturing because glulam come from natural sources. Glulam are made

from wood which is renewable resources because when cutting the tree it can be

planted again. It also can reduce the greenhouse gas emission in

manufacturing.The grip of the pedestrian subjected to the bridge is focused in this study. The stress due to vertical live loading will cause the Glulam beam fail if it reaches to elastic

limit

SCOPE OF WORK

To carry out a modeling analysis of the structural behavior of Glulam beam of 50 metre pedestrian bridge subjected under vertical live load based on BD37/01 using finite element software namely London University Stress Analysis System and also known as LUSAS

OBJECTIVES

To carry out an analysis of structural behavior of Glulam beam bridge due to the vertical live loading

To study the stress effect on structural behavior of Glulam beam bridge due to the vertical live loading

To determine the temperature effect of the Glulam beam bridge

LITERATURE REVIEW

BRIDGE

PEDESTRIAN BRIDGE

GLULAM TIMBER PEDESTRIAN

BRIDGE

GLULAM CONSTRUCTION

DESIGNING

BRIDGE

Bridge is a structure that built for people or vehicles to cross over the barrier for instance the road, the river, and the railway. Bridge also can be changeable in its designing and can be design based on the function of the invention of the bridge (P. J. S Cruz, 2009).

PEDESTRIAN BRIDGE

Pedestrian bridge also namely as foot bridge is built for the people to walk on such as to cross over the congestion of the traffic and without disturbing the traffic and crossing the road safely (Rhode-Barbarigos, 2010).

GLULAM TIMBER PEDESTRIAN BRIDGE

From the previous period of 37 years before, there are many uses of timber for pedestrian bridge are built for main road and municipal travel road. (Stefano Battocchi and Andrea Polastri, 2006).

GLULAM CONSTRUCTION In the engineered wood construction, glue

laminated timber contribute in redefining the potential. The structural usefulness of a renewable resources such as wood can be optimizes by the glulam as an engineered wood product. The members of the glulam are consisted of the individual pieces of dimension lumber. Glulam are tougher than steel and it is meaning that beam for glulam can has long distances of the span without maximal need for the support at the intermediate. (John Blaustein, 2008).

DESIGNING

The loadings of the bridge are usually design based on Eurocode 5 or BD 37/01, which is the design manual for roads and bridges.

In our country, the designing of the structural for timber is based on Malaysian Standard (MS 544).

GAP OF RESEARCHAuthor Year Title Objective Findings

Stefano Battocchi & Andrea Polastri

2006 Pedestrian timber bridges with glulam beams and LVL deck

To have a confirmation that the simplified schemes adopted in hand calculations are correct and on the safe side and to make a realistic analysis of the mechanical response either of the entire structures or its individual components, in the various significant load combinations

The effects of the concentrated load that acts over the deck of the bridge cannot be solved by simplified hand calculations, and finite element models must be developed to get a correct solution.

Baidar Bakht 1988 Load distribution in laminated timber decks

To review the current methods and where appropriate, propose new ones for analyzing the load distribution effects in transverse laminated decks subjected to concentrated wheel loads

Improvement in load distribution characteristics in laminated decks, due to either gluing or prestressing the laminates together can be quantified readily by using the simplified methods

THEORETICAL BACKGROUNDNominal pedestrian load based on BD37/01 as follow : For loaded lengths in excess of 36m , k × 5.0 kN/m2 where k is the nominal HA UDL for appropriate loaded length (in kN/m) × 10For loaded lengths of 36m and under, a uniformly distributed live load of 5.0 kN/m2

Displacement due to temperature :∆L = ɑ (∆T) LWhere :L = Span lengthɑ = Coefficient of thermal expansion(∆T) = Changes in temperature

METHODOLOGY

Problem identification Data collection Insert data

Development model using

LUSAS

Varification of the model

Analyse the model under vertical live

loading

Findings and conclusions

EXPECTED OUTCOMESHighest Stress Value

Location of Highest Stress Value

Highest Strain Value

Location of Highest Strain Value

Shear Behavior

REFERENCES Ander Gustafsson, Anna Pousette, Niclas Bjorngrim .

(2010). Health Monitoring of Timber Bridges. International Conference on Timber Bridges.

Baidar Bakht, Member, ASCE. (1988). Load Distribution in Laminated Timber Decks. Journal of Bridge Engineering @ ASCE.

P.J.S. Cruz, R. Salgado, J.M. Branco. (2010). Dynamic Analysis and Structural Evaluation of GOIS Footbridge. University of Minho, Portugal.

Rhode-Barbarigos, L., Bel Hadj Ali, N., Motro, R. and Smith, I.F.C. (2010). Designing Tesengrity Modules for Pedestrian Bridges. Structural Engineering Institute, Switzerland.

Steffano Battochi & Andrea Polastri. (2006). Pedestrian Timber Bridges with Glulam Beams and LVL Deck. Chalmers University of Technology, Goteborg, Sweden.

THE ENDTHANK YOU