SummaryStudents learn how engineers design and construct buildings to withstand earthquake damage by building their own model structures using toothpicks and marshmallows. They experiment to see how earthquake-proof their buildings are by testing them in an earthquake simulated in a pan of Jell-O®.
Because earthquakes can cause walls to crack, foundations to move and even entire buildings to crumple, engineers incorporate into their structural designs techniques that withstand damage from earthquake forces, for example, cross bracing, large bases and tapered geometry. Earthquake-proof buildings are intended to bend and sway with the motion of earthquakes, or are isolated from the movement by sliders. Engineers come up with an idea, test it, and then re-engineer the structure based on its performance.
After this activity, students should be able to:
- Identify some of the factors that make buildings earthquake-proof, including cross bracing, large "footprints," and tapered geometry.
- Model an earthquake-proof structure using simple materials.
- Compare a model structure with what it represents.
- Understand why engineers need to learn about earthquakes.
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Each TeachEngineering lesson or activity is correlated to one or more K-12 science,
technology, engineering or math (STEM) educational standards.
All 100,000+ K-12 STEM standards covered in TeachEngineering are collected, maintained and packaged by the Achievement Standards Network (ASN),
a project of D2L (www.achievementstandards.org).
In the ASN, standards are hierarchically structured: first by source; e.g., by state; within source by type; e.g., science or mathematics;
within type by subtype, then by grade, etc.
Each TeachEngineering lesson or activity is correlated to one or more K-12 science, technology, engineering or math (STEM) educational standards.
All 100,000+ K-12 STEM standards covered in TeachEngineering are collected, maintained and packaged by the Achievement Standards Network (ASN), a project of D2L (www.achievementstandards.org).
In the ASN, standards are hierarchically structured: first by source; e.g., by state; within source by type; e.g., science or mathematics; within type by subtype, then by grade, etc.
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- Models are used to communicate and test design ideas and processes. (Grades 3 - 5) Details... View more aligned curriculum... Do you agree with this alignment? Thanks for your feedback!
- Modern communities are usually planned according to guidelines. (Grades 3 - 5) Details... View more aligned curriculum... Do you agree with this alignment? Thanks for your feedback!
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Each student needs:
- 30 toothpicks
- 30 miniature marshmallows
- Earthquake Journal
For the entire class to share:
- eight 8½-inch square disposable baking dishes, or one 8½ x 11-inch disposable roasting or baking pan
- 8 boxes Jell-O® - plus a stove, water and pan to make it in advance
Earthquakes can cause much loss of life and millions of dollars worth of damage to cities. Surface waves and body waves from earthquakes can cause walls to crack, foundations to move and even entire buildings to crumble. Engineers continually strive to make buildings stronger to resist the forces of earthquakes.
Engineers face the challenge of designing more robust buildings to withstand earthquakes. Earthquake-proof buildings are intended to bend and sway with the motion of earthquakes, instead of cracking and breaking under the pressure.
Have you ever looked at a really tall building, such as a skyscraper? What does it look like? Does it appear fragile and unstable? It might, but it is most probably quite sturdy and can withstand wind, rain and other natural elements and phenomena. Earthquake-proof buildings typically have cross bracing that forms triangles in its design geometry (like a bridge). Such buildings also typically have a large "footprint," or base, and a tapered shape, decreasing in size as the building gets taller (or simply, smaller at the top). Short buildings are more earthquake proof than tall ones. Why do you think that is? Have you ever climbed up a tree or been on top of a playground jungle gym in the wind? Do you sway more when you are up high than when on the ground? All buildings shake at the same frequency as the shaking of the Earth, but the movement is magnified as the building gets taller. Sometimes, as can be the case during earthquakes, buildings sway too much, crack and crumble and fall.
Before the Activity
- Prepare the Jell-O® the night before the activity so that it is fully set when students begin the activity. Pour the Jell-O® into eight 8½-inch square pans to be shared by four students, or in one large pan for the entire class to share.
- Make one marshmallow-toothpick structure as a display example for students.
- Gather materials and make copies of the Earthquake Journal.
With the Students
- Hand out student journals. Have students fill in the top left section of the journal with vocabulary terms. Direct students to record their activity observations as they work.
- Tell students that today they are acting as if they are engineers. They will make models of buildings and conduct an experiment to test how well their structures stand up under the stress of an earthquake. Explain to them that this is similar to what some civil engineers do as their jobs.
- Show students the display model of a structure.
- Illustrate how to make cubes and triangles using toothpicks and marshmallows. Show students how to break a toothpick approximately in half. Explain that cubes and triangles are like building blocks that may be stacked to make towers. The towers can have small or large "footprints" (or bases).
- Distribute 30 toothpicks and 30 marshmallows to each student. Explain that the Earth has limited resources, so engineers are typically limited in the resources provided to them when building structures (money, time, materials).
- For this engineering challenge, students are limited to using only the materials they have been given to make structures. They may make large or small cubes or triangles by using full-size or broken toothpicks. They may use cross-bracing to reinforce their structures. (Note: For higher grade levels, give students more constraints for their model buildings.) In addition to the material limitation, require that student designs meet one or more of the following constraints, or create your own:
- Buildings must be at least 2 toothpick levels high
- Buildings must contain at least 1 triangle
- Buildings must contain at least 1 square
- Buildings must contain 1 triangle and 1 square
- Place the structures on the pans of Jell-O®.
- If aluminum pans are used, tap the pans on the bottom to simulate compression or primary waves. If glass baking dishes are used, shake them back and forth in a shearing motion to simulate S or secondary waves.
- After students have tested their structures, have them redesign and rebuild them and finally test them again. What can they do to make the structure stronger? Did it topple? Would it help to make the base bigger? Make the structure taller or shorter? Let students design and rebuild as many times as time allows.
- Have students draw and label the shapes in their designs (cube, triangle, etc.).
- Have students imagine that they are engineers who work for a civil engineering company. Direct them to each make a flyer to convince their company to let them design a better building or structure.
- Give students time to finish their journals, as described in the Assessment section.
Inform students that in an experimental testing lab or during science experiments, nothing should ever be put into their mouths. The marshmallows and Jell-O® are not for consumption. Instead, set some aside for a treat after the activity.
The activity works best with fresh (soft) marshmallows. As the marshmallows sit out and dry out, they and the structures become stable and rigid.
Do not leave the Jell-O® uncovered too long, as it dries out and becomes less fluid, which affects the activity results.
Journal: Use the attached Earthquake Journal page or have students make their own by doing the following: First, put a title on the page: Measuring Earthquakes. Then divide the page into four quadrants labeled: Vocabulary, What I've Learned, What I Observed, and Questions I Have. Have students enter the new vocabulary words for the lesson (such as: tectonic plates, Ring of Fire, focus, epicenter, surface waves, body waves, P waves, S waves, aftershocks, seismograph, Richter scale, Mercalli scale) in the Vocabulary section.
Activity Embedded Assessment
Journal: Have students record their own observations in the section titled, "What I've observed."
Measurement: Have students measure the length, width, and height of their structures and calculate the volume using the equation V = L x W x H.
Journal: Have students fill in the final sections of the journal labeled, "What I've Learned," and "Questions I Have." Solicit questions from the students and let other students answer.
Re-Engineering: After students have tested their model structures, have them redesign and rebuild them, then test again. What can they do to make the structure stronger? Did it topple? Would it help to make a bigger base? Make it taller or shorter? Let students design and rebuild as often as time allows.
Drawing the Geometry: Have students make drawings and label the shapes in their designs (cube, pyramid, triangle, etc.).
Make a Pitch! Have students imagine being engineers and make flyers to convince a company to let them design a better building or structure.
News Broadcast:: Have student teams write news broadcasts about an earthquake that has hit their hometowns. Have the broadcast begin with something exciting to catch the listener's attention. Then tell the facts of the event. Have the teams share their news broadcasts with the class.
Have students examine the school for earthquake engineering. Does the school building encompass some of the principles of earthquake proofing?
Observe buildings in the community or nearby city. What do students observe about the structure of the buildings?
Obtain fault maps of the area by Internet search. Start by searching the Federal Emergency Management Agency or National Earthquake Education Center. Is the area in a zone at risk for earthquakes? Does the local building codes and architecture plan for this?
For higher grades, give students more requirements and constraints for their model buildings.
ContributorsJessica Todd; Melissa Straten; Malinda Schaefer Zarske; Janet Yowell
Copyright© 2004 by Regents of the University of Colorado
Supporting ProgramIntegrated Teaching and Learning Program, College of Engineering, University of Colorado Boulder
The contents of this digital library curriculum were developed under grants from the Fund for the Improvement of Postsecondary Education (FIPSE), U.S. Department of Education, and National Science Foundation (GK-12 grant no 0338326). However, these contents do not necessarily represent the policies of the Department of Education or National Science Foundation, and you should not assume endorsement by the federal government.
Last modified: March 16, 2018