Description

The Bridge Challenge is a competition that consists in making a model bridge.

Each team of 2 to 4 students from higher education will have to build a bridge in one day (9 hours) according to the criteria detailed below.
To be more efficient on D-Day, it is advisable to think about the structure of the bridge.
A plan will also be requested. The bridges will be evaluated according to several criteria, then, on the following day (Sunday morning) they will be loaded till they collapse.

 

          Calendar

■ Registration will be open from the 10th January 2020 using the web site in the tab called “inscription” in French, or “registration” in English on the web page which describes the contest planned for 2020.

■ Registration will be closed when the number of teams has reached the number necessary for the smooth functioning of the contest. If this number is not reached, registration will be closed the 10th March 2020.

■ Each team must send, before the 10th March, 2020, the registration fee and a copy of the student cards of each team member to the address or in e-mail (bcenise@gmail.com):

Bridge Challenge ENISE

58 rue Jean Parot

42100 Saint-Etienne

■ The contest will take place during the weekend of the 28th to 29th March 2020, at Saint Etienne, “Place Chavanelle”.

 

          Registration fee

The registration fee allows you to enter the competition. They will be increased after February 19 deadline. For those who wish to have accommodation, they will be asked for an extra charge*.

 

* Accommodation on Friday evening and/or Saturday evening adds an extra 25 euros per person per night. Please note that the number of places is limited.
Payment is to be made by cheque to the order of “Bridge Challenge ENISE” or by bank transfer. After completing the registration form, a RIB will be sent to the team leader.

e-mail: bcenise@gmail.com

 

         2020 novelty

This year’s competition is divided into two categories: the architecture category and the resistance category.

The resistance category is divided into two subcategories: less than 150 grams of balsa and less than 300 grams of balsa.
Only the teams having chosen in the resistance category will see their bridge subject to loading. The models in the architecture category will not be loaded nor destroyed.
The best bridge in the architecture category will be awarded the architecture prize. The best bridge in each resistance subcategory will be awarded the resistance prize.
Finally, all the bridges will be evaluated for the Engineering Award and the Public Award.

 

          Architecture category

The teams having chosen the architecture category will compete with teams in the same category.
They will not be opposed to those who have chosen to compete in the resistance category. The bridges will not be loaded until they break and will not be destroyed during the competition.
Each team will be given an identical pack of different balsa profiles composed of 1 meter-long rods.

 

Materials: 

  • 1 medium board for the bridge deck: 3x140x1600 mm
  • 1 OSB board for the bridge base: 30x610x2000mm
  • 2 blocks of cell concrete (Siporex): 200x250x300 (height) and 2 blocks 200x120x100
  • 1 pot of wood glue (about 160g), 1 tube of super glue (5g), kitchen thread (10m), 6kg fishing nylon thread line (40m).
  • 1 meter-long balsa wood rods in different sections (see table below):

The total weight is 299.46 grams.
Any materials (glue, balsa, thread, nails, screws, etc.) other than those provided are strictly forbidden.

Base:

The Siporex blocks (200x250x300) will serve as abutment for the bridge and will be placed 1400 mm apart from each other.

A two-part 2-block 200x120x100 (L x w x h) pier is placed 400 mm from the first abutment and 800 mm from the second one, as shown in the diagram below:

 

 

The table below indicates the clearances under the bridge. They must allow two templates (= gabarit written in French) pass under the bridge.
Any bridge that doesn’t fit one and/or both templates will be excluded.

 

 

The support on the two-part pier is allowed provided that the clearance respects the measures as shown below.

A template will be used as a checking gauge.

 

 

        Resistance category: less than 150g

The teams that have chosen the less than 150g of balsa resistance category will compete with one other. The base of their bridge will be different from the one of the less than 300g resistance
category. At the end of the competition, the bridges will be loaded with weights ranging from 2.5kg to 5kg until they collapse.

The bridge that will stand up to the heaviest load will be awarded the “under 150g resistance” prize.
Each team will be given an identical pack of different balsa profiles composed of 1 meter-long rods.

 

Materials:

  • 1 medium board for the bridge deck: 3x140x1300 mm
  • 1 OSB board for the bridge base: 30x610x1700mm
  • 2 blocks of cell concrete (Siporex): 200x250x300 (height) and 2 blocks 200x120x100
  • 1 pot of wood glue (about 160g), 1 tube of super glue (5g), kitchen thread (10m), 6kg fishing nylon thread (40m).
  • 1 meter-long balsa wood rods in different sections (see table below):

The total weight is 149.24 grams.

Any materials (glue, balsa, thread, nails, screws, etc.) other than those provided are strictly forbidden.

 

Base:

The siporex blocks (200x250x300) will serve as abutment for the bridge and will be placed 1100 mm apart from of each other.

A two-part 2-block 200x120x100 (L x w x h) pier is placed 300 mm from the first abutment and 600 mm from the second one, as shown in the diagram below:

 

 

The table below indicates the clearances under the bridge. They must allow two templates (= gabarit written in French) pass under the bridge.

Any bridge that doesn’t fit one and/or both templates will be excluded.

 

 

The support on the two-part pier is allowed provided that the clearance respects the measures as shown below. A template will be used as a checking gauge.

 

 

 

        Resistance category: less than 300g

The teams that have chosen the less than 300g of balsa resistance category will compete with one other. The base of their bridge will be different from the one of the less than 150g resistance category. At the end of the competition, the bridges will be loaded with weights ranging from 2.5kg to 5kg until they collapse.

The bridge that will stand up to the heaviest load will be awarded the “under 300g resistance” prize.

Each team will be given an identical pack of different balsa profiles composed of 1 meter-long rods.

 

Materials:

  • 1 medium board for the bridge deck: 3x140x1600 mm
  • 1 OSB board for the bridge base: 30x610x2000mm
  • 2 blocks of cell concrete (Siporex): 200x250x300 (height) and 2 blocks 200x120x100
  • 1 pot of wood glue (about 160g), 1 tube of super glue (5g), kitchen thread (10m), 6kg fishing nylon thread (40m).
  • 1 meter-long balsa wood rods in different sections (see table below):

The total weight is 299.46 grams.

Any materials (glue, balsa, thread, nails, screws, etc.) other than those provided are strictly forbidden.

 

Base:

The Siporex blocks (200x250x300) will serve as abutment for the bridge and will be placed 1400 mm apart from each other.

A two-part 2-block 200x120x100 (L x w x h) pier is placed 400 mm from the first abutment and 800 mm from the second one, as shown in the diagram below:

 

 

The table below indicates the clearances under the bridge. They must allow two templates (= gabarit written in French) pass under the bridge.

Any bridge that doesn’t fit one and/or both templates will be excluded.

 

 

The support on the two-part pier is allowed provided that the clearance respects the measures as shown below. A template will be used as a checking gauge.

 

 

        Material 

The following equipment will be placed at each team’s disposal during the week-end:

  • A tape measure,
  • A ruler,
  • A cutter,
  • Glass-paper,
  • A tab box with a 300 mm back saw,
  • a pencil,
  • a carpenter’s square,
  • 4 chisels of different sizes

However, you can bring your own equipment if you think it necessary to do so, provided it is portable powered.

Note: You will not have access to electricity except to eventually recharge your batteries.

 

        Constraints

  • The bridge span will be 1400mm or 1100mm long depending on the category. It is forbidden to cut the Siporex blocks as well as the OSB board to reduce the bridge span.
  • It is possible to sandpaper or cut the Siporex blocks. However, it is forbidden to re-use the Siporex falls for the bridge construction.
  • On the deck, an area of 100 x 1400 mm (for bridges less than 300g) or 100 x 1100 (for bridges less than 150g), must remain free for the loading.
  • The OSB board must not be cut nor drilled.
  • The deck medium board can be cut and drilled, but the resulting materials must not be used to strengthen the bridge. The deck must have a minimum span length of 1400 mm (for bridges less than 300g and architecture) or 1100 mm (for bridges less than 150g).
  • Balsa sticks must not rest on the OSB board.
  • The kitchen thread as well as the fishing line must not be used as reinforcement in the deck, they can only be used in setting up a cable-stayed bridge, an under-stretched bridge, a suspension bridge, …
  • Only the Siporex blocks can be painted.
  • It is allowed but not necessary to use the central siporex blocks as supports provided that a template (see diagram) can be inserted under the deck.

        Contest

Each group will create a poster showing their bridge (architectural choice, structure choice, plans of the bridge) before the date of the competition. That poster will be exhibited during the competition.

During the weekend, the teams will have to build the bridge on Saturday (9am to 6pm) and a jury will evaluate each bridge on Sunday. The bridges in the resistance category will then be loaded.

The decks will be loaded linearly until the structure collapses with weights ranging from 2.5kg to 5kg. The weights will be placed starting from the middle to the ends of each span, then stacked.

The structure will be considered broken as soon as one of the stacked weights falls due to structural instability or structural failure. If a bridge does not collapse after placing all the weights at our disposal, the team will get the maximum score on the resistance assessment.

 

        Rating grid

The bridges will be judged by a jury of architects and engineers, according to the following scoring grid:

  • Engineering (30 points)

Feasibility of the bridge in real conditions:

10 points

Relevance of the structure (good use of a beam, …):

10 points

Justification of the technical choices:

10 points

 

  •  Architecture (30 points)

Quality of the finishing touches (smears of glue, badly cut wood, …):

5 points

Structure harmony (proportion):

10 points

Architectural innovation:

10 points

Resemblance to the poster:

5 points

 

        Rewards

The following awards will be given to the teams:

The engineering prize (1st, 2nd and 3rd places)

The architectural prize (1st, 2nd and 3rd places)

The audience prize (1st place)

The less than 150g resistance prize (1st place)

The less than 300g resistance prize (1st place)

 

        Restitution of the models

Participants will not be allowed to get their models back.

Those that will not have been destroyed will be kept by the organizing team and used for communication for the competition.

 

        Settlement acceptance

Registration for the competition implies acceptance of all the terms of this regulation.

Participants commit themselves to participate in the entire making of their model on March 28 and 29, 2020.

 

        intellectual property 

Participants undertake to accept, without being entitled to any remuneration or reward, the publication of their identity and the presentation of their project for informational, promotional or media purposes, as part of this transaction , regardless of how this information is broadcast (brochures, brochures, leaflets, posters, press articles, website, etc.).

Each candidate agrees to give the right to use his image, name and surname free of charge to the organizer and his partners for the exploitation of photographs, interviews or videos taken during the competition and which could be used by the organizer and its partners to promote this operation (internal as well as external communication, paper, video, internet etc.).

However, the organizer guarantees not to communicate the participants contact information to third parties without their consent.

 

        Possible changes

The organizer reserves themselves the right to amend this regulation at any time and to take any decisions that they think proper for the application and interpretation of the regulation. The organizer will be able to inform the participants and their legal representatives by any means of their choice. The organizer also reserves themselves the right to modify, extend, shorten, suspend or cancel the competition, without notice, for any  reason whatever. In particular, the organizer will reserve themselves the right, if it is necessary, to invalidate and/or cancel all or part of the competition if it appears that cheating or dysfunctioning have occurred in any form in the context of the participation in the competition or the determination of the winners. They reserve themselves, in this case, the right not to award the prize to cheaters and/or to prosecute them before the competent court of justice. Fraud leads to the immediate disqualification of the trespasser. The responsibility of the organizer and their partners cannot be committed by way of the above and the participants and their legal representatives will therefore not be entitled to any compensation.

 

        Computing and freedoms

It is recalled that in order to participate in the contest, participants must necessarily provide personal information about themselves (name, first name, email, telephone, etc.).

The purpose of collecting this personal information is to enable the competition to function properly. This information is stored in a computer file for the time it takes to take their participation into account, determine the winners and award prizes. This information is intended for the organizer. Failure to communicate this data will result in not allowing participation in the competition. They will not be kept after the proclamation of the results.

Under the Act 78-17 of January 6 1978 on computer science (data processing), files and freedoms, participants have the right to object, access, correct and delete their data. To exercise these rights, participants or their legal representatives will have to send a letter to the Bridge Challenge ENISE association (see “Who are we?” on our website).