That's because a research team that includes Babak Moaveni, assistant professor of civil and environmental engineering at Tufts University School of Engineering, plans to shake and rumble the structure until it's on the verge of collapsing into a heap of debris and dust.
Moaveni is collaborating with Andreas Stavridis, assistant professor of civil engineering at the University of Texas-Arlington, on a National Science Foundation-funded study to assess how buildings made with reinforced concrete frames and masonry infill walls hold up during an earthquake. The data will also be used to refine existing analytical models and techniques that engineers use when evaluating seismic safety of similarly constructed buildings. The research team also includes engineers from the University of California, at Los Angeles (UCLA).
Thousands of such buildings exist in earthquake-prone places like Los Angeles, San Francisco, the Mediterranean and Latin America, and they are vulnerable to serious damage. "These buildings were built and designed years ago according to building codes that have since become outdated," says Moaveni.
Using an "Eccentric-Mass" Shaker to Rattle a Building
Typically, after an earthquake, owners of a building like the one on West Commercial Avenue would have the structure repaired and maybe retrofitted so that it could endure the next quake. But damage from the 2010 earthquake was so severe that repair was not worth the cost. Owners and the city officials decided to have it demolished.
That’s when Moaveni and Stavridis came forward. In the first phase of the project, the engineers will record the building's existing condition. Then, the team will install a spinning device called an eccentric-mass shaker on the building's roof. This device will induce further damage by simulating the pulsing and vibration of an earthquake rattling the structure from the top down. This has not been done before with an entire structure with that degree of damage. "We are glad that the building owners realized that the building’s misfortune has presented a unique research opportunity for us," Stavridis explains.
The researchers will install cameras at critical locations of the structures to observe damage as the test progresses. At specific intervals, they will also halt the shaker to assess and document structural damage, through visual inspection. Computers will also record data from sensors inside the building. With the initial measurements as a baseline, the researchers will evaluate and quantify progressive damage sustained by the building as it is shaken apart.
Field testing of full-scale structures using mechanical shakers plays an important role in this type of seismic research. In previous experiments, researchers have experimented on wall portions or sections of buildings using low-to-moderate levels of vibrations. "This is a very challenging project but a great research opportunity because we are working with an entire existing building," says Moaveni.
In their project, Moaveni and Stavridis plan to exert large-amplitude forces on the building. "We don't know if we will shake the building until it collapses," Moaveni says. "But, at a minimum, we will shake it until it is on the verge of collapse."About Tufts School of Engineering
Alex Reid | Newswise Science News
Modular storage tank for tight spaces
16.03.2017 | FIZ Karlsruhe – Leibniz-Institut für Informationsinfrastruktur GmbH
Smart homes will “LISTEN” to your voice
17.01.2017 | EML European Media Laboratory GmbH
Staphylococcus aureus is a feared pathogen (MRSA, multi-resistant S. aureus) due to frequent resistances against many antibiotics, especially in hospital infections. Researchers at the Paul-Ehrlich-Institut have identified immunological processes that prevent a successful immune response directed against the pathogenic agent. The delivery of bacterial proteins with RNA adjuvant or messenger RNA (mRNA) into immune cells allows the re-direction of the immune response towards an active defense against S. aureus. This could be of significant importance for the development of an effective vaccine. PLOS Pathogens has published these research results online on 25 May 2017.
Staphylococcus aureus (S. aureus) is a bacterium that colonizes by far more than half of the skin and the mucosa of adults, usually without causing infections....
Physicists from the University of Würzburg are capable of generating identical looking single light particles at the push of a button. Two new studies now demonstrate the potential this method holds.
The quantum computer has fuelled the imagination of scientists for decades: It is based on fundamentally different phenomena than a conventional computer....
An international team of physicists has monitored the scattering behaviour of electrons in a non-conducting material in real-time. Their insights could be beneficial for radiotherapy.
We can refer to electrons in non-conducting materials as ‘sluggish’. Typically, they remain fixed in a location, deep inside an atomic composite. It is hence...
Two-dimensional magnetic structures are regarded as a promising material for new types of data storage, since the magnetic properties of individual molecular building blocks can be investigated and modified. For the first time, researchers have now produced a wafer-thin ferrimagnet, in which molecules with different magnetic centers arrange themselves on a gold surface to form a checkerboard pattern. Scientists at the Swiss Nanoscience Institute at the University of Basel and the Paul Scherrer Institute published their findings in the journal Nature Communications.
Ferrimagnets are composed of two centers which are magnetized at different strengths and point in opposing directions. Two-dimensional, quasi-flat ferrimagnets...
An Australian-Chinese research team has created the world's thinnest hologram, paving the way towards the integration of 3D holography into everyday...
24.05.2017 | Event News
23.05.2017 | Event News
22.05.2017 | Event News
26.05.2017 | Life Sciences
26.05.2017 | Life Sciences
26.05.2017 | Physics and Astronomy