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Engineers put five-story building on seismic shake table to test for earthquake, fire readiness

                     
Engineers put 5-story building on seismic shake table to test for earthquake and fire readiness
This is an overall shot of the five-story building that will be tested at the Englekirk Center at UC San Diego starting April 16. Credit: Jacobs School of Engineering at UC San Diego
What happens when you put a fully equipped five-story building, which includes an intensive care unit, a surgery suite, piping and air conditioning, fire barriers and even a working elevator, through series of high-intensity earthquakes?
Structural engineers at the University of California, San Diego are about to find out during a two-week series of tests conducted on the world's largest outdoor shake table at the Englekirk Structural Engineering Center. The overarching goal of the $5 million project, which is supported by a coalition of government agencies, foundations and industry partners, is to ascertain what needs to be done to make sure that high-value buildings, such as hospitals and data centers, remain operational after going through an earthquake. Researchers also will assess whether the building's fire barriers have been affected by the shakes.
Throughout the two weeks of testing, engineers will monitor the building's performance with more than 500 high-fidelity sensors and more than 70cameras that will record the movement of key elements and components inside the building.
"What we are doing is the equivalent of giving a building an EKG to see how it performs after an earthquake and a post-earthquake fire," said Professor Tara Hutchinson of the Jacobs School of Engineering at UC San Diego, the project's lead principal investigator.
Hutchinson is working with a multi-disciplinary team of academics and industry representatives, including Jacobs School Professors Jose Restrepo and Joel Conte.
The two-week series of experiments will feature a number of firsts:
  • This is the first time in the United States that tests focus on a broad range of nonstructural systems and equipment that can malfunction during an earthquake, such as a working elevator, stairs and a broad array of medical equipment. The tests also include modern ceiling systems, a heating and air conditioning system, functional sprinklers, computer servers, large and small laboratory equipment, and electrical equipment and wiring. Over the past three decades, the majority of losses caused by earthquakes can be attributed to damage to nonstructural elements such as these. The 80-foot-tall structure also is equipped with a large water tower and an air conditioning and heating unit on its roof. The exterior of the building is complete with heavy precast concrete cladding as well as synthetic stucco, each commonly used in commercial construction.
  • This is also the first time that a base isolation system will be tested under a full-scale building on a shake table in the United States. The system is comprised of large cylindrical rubber bearings that isolate the five-story building from most of the lateral motion it would normally experience during a temblor. Similar systems have been used to retrofit the Los Angeles, Oakland and San Francisco city halls, among other structures. Base isolation also is used in new construction in the United States and is fairly widespread in Japan. The method is particularly useful for shorter, stiffer buildings rather than taller buildings such as high-rises. During the second week of testing, the base isolation bearings will be removed and the building's foundation will be anchored directly on the .
  • This is the first time that a building will undergo fire testing after being put through a series of simulated seismic events. Researchers from UC San Diego and the department of engineering at the Worchester Polytechnic Institute will first study the performance of active and passive fire protection systems, which will provide insight into damage caused by earthquakes. Then, in May, engineers will conduct fire tests in the building, tracking temperatures and the movement of smoke to help gauge the potential for fire spread in an earthquake-damaged building.
"The tests will have a significant impact on how engineers model the nonstructural components of a building and how they calculate what forces they need to withstand during an earthquake," Hutchinson said. "We can improve our understanding of their performance and accuracy of design predictions by using data generated from tests such as these," she said. "We are hoping that our work will help prevent unnecessary loss of life and loss of property."
Researchers also hope to better understand what needs to be done to make sure medical centers remain operational after a temblor. The building's top two floors are outfitted with a surgery suite and , two components of the project supported by the California Seismic Safety Commission, which investigates earthquakes and recommends to the governor and state legislature policies that will reduce earthquake risks.
Engineers put 5-story building on seismic shake table to test for earthquake and fire readiness
Graduate student Elide Pantoli checks one of the sensors installed on the five-story building to be tested starting April 16. Credit: Jacobs School of Engineering at UC San Diego
Likewise, the fire-related data will help engineers model the fire performance of buildings damaged in earthquakes. "Knowing how fire protection systems might fail in an earthquake, and how the fire and smoke might spread, will allow us to design more resilient systems and provide better protection to people, property and mission," said Brian Meacham, associate professor of fire protection engineering at WPI.
Measuring the building's performance
Sensors will be placed strategically throughout the building to measure how components perform. For example, 230 accelerometers will measure how fast the building and its nonstructural components moved during the simulated temblors. In addition, 160 sensors, including high resolution GPS devices, will measure the relative displacement between two points, while 50 strain gauges will measure the deformation of the rebar that are buried in the building's concrete foundations. About 80 cameras will be focused on the building, with most of these distributed within the interior of the building to monitor the nonstructural elements during the tests.
Simulated earthquakes
During the two weeks of testing, researchers will put the buildings through a variety of simulated temblors, using motions that have been recorded from:
  • The 1994, 6.7-magnitude Northridge earthquake.
  • The 2002, 7.9-magnitude earthquake that took place in Denali, Alaska, these motions are similar to seismic events that could occur in Southern and Central California.
  • The 2010, 8.8-magnitude earthquake in Chile and the 2007, 8.0-magnitude earthquake in Peru. The Chile and Peru events produced ground motions that could occur in the Cascadia subduction zone off of the coast of Northern California, in Crescent City and Eureka, for example.
On April 17, the building will be subjected to motions recorded during the 1994 Northridge and 2010 Chile earthquakes.
Other components
During this complex series, researchers also will be investigating the performance of nonstructural systems, which provide evacuation support for the occupants of a building. "In the 2011 Christchurch earthquake in New Zealand, and in other past earthquakes, stairs have failed in some buildings," Restrepo pointed out. Scientists hope the tests will help find ways to keep elevators and stairs safe and functional after a major temblor.
Other components of the project include and laboratory equipment on the third floor. The five-story building also is outfitted with two different kinds of façade: the two top floors consist of heavy, precast concrete panels, while the three lower floors are covered with flexible metal studs overlaid with gypsum board and light-weight stucco, with the studs constructed using a multi-floor spanning strategy known as a balloon framing.
Fire testing
During the seismic tests, researchers from WPI, led by Meacham, will regularly inspect passive fire protection components, including doors, ceiling systems, partition walls and fire resistant materials that seal openings in walls, to see how they are faring. If these systems are compromised, they could allow flames and smoke to spread and air to enter a room to feed a fire. They will also inspect the condition of active fire suppression systems, particularly sprinklers.
Engineers put five-story building on seismic shake table to test for earthquake, fire readiness
Detail illustrations and layout Zina Deretsky, National Science Foundation, Building illustrations UC San Diego Department of Structural Engineering.
In mid-May, following the two weeks of seismic testing, the WPI team will perform two days of fire testing on the third floor of the building. They will ignite pans of heptane, a liquid fuel that burns hot enough to simulate full burning within a closed space. Using sensors that record temperature and smoke movement, researchers will assess how damage from the simulated earthquakes affect the ability of the active and passive fire protection systems to contain fires and prevent the spread of smoke. Though fires that take place after earthquakes are a well-known and serious hazard, very little is known about the performance of fire protection systems in earthquakes, Meacham said. The data gathered through this research could help inform more effective fire codes. In addition, this study will provide a unique opportunity to simultaneously observe the effects of shaking and fire on building systems, which could lead to new multi-hazard computer models that could help architects and engineers design safer buildings.
Meanwhile, Hutchinson, Restrepo, Conte and their colleagues will spend the following year analyzing data from the project before publishing their complete findings. The team also includes academic partners Ken Walsh of San Diego State University, Claudia Marin, of Howard University and Brian Meacham of Worcester Polytechnic University.
The project is sponsored by the National Science Foundation, the Network for Engineering Simulation, the California Seismic Safety Commission, the Charles Pankow Foundation, the Englekirk Advisory Board, the Society of Fire Protection Engineers and a large consortium of U.S. and international industry partners. 

Global Building Automation Software Market by Analysis and Industry Outlook 2017-2022


The study on the Global Building Automation Software Market has assessed the historical and current performance of this market, especially highlighting the key trends and growth opportunities


According to the study, the rising demand for this product is driving the Global Building Automation Software Market  

Automation Controls

Building Automation System involves a combination of multiple building management systems installed in buildings using computer based control system that control and monitoring of a buildings mechanical and electrical equipment such as ventilation, lighting, power systems, fire systems, and security systems. The objectives of building automation are improved occupant comfort, efficient and effective operation of building systems, and reduction in energy consumption and operating costs. Buildings controlled by a BAS is often referred to as a smart building.smart-buildings-intelligent-solutions
Smart buildings go far beyond saving energy and contributing to sustainability goals. They enable innovation by creating a platform for accessible information. They turn buildings into virtual power generators by allowing operators to operate a facility with increased efficiency, manage electrical loads and sell the “megawatts” into the market. They are a key component of a future where information technology and human ingenuity combine to produce the robust, low-carbon economy envisioned for the future. The BAS plan for smart, connected building provided by Total Eco Energy is at the center of this vision, providing not just the roof overhead, but also the information infrastructure to make possible a truly intelligent world.

 
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Elevator Control

Elevators must be controlled to protect the inhabitants of the building. There are added benefits to securing access to elevators, such as effectively reducing the building’s risk of costly theft and damage to the structure. Implementing elevator access control measures is also a method to limit undesirable transient traffic.
Available features for elevator access control include:
– Control all of your elevators for every floor in your building, expandable and adaptable for your entire facility
– Integration with building automation system and video surveillance systems
– Accessible floors can be set for each card holder by the system administrator 

Fire Alarm Control


A Fire Alarm Control Panel (FACP) is the controlling component of a Fire Alarm System. The panel receives information from environmental flame or smoke sensors designed to detect changes associated with fire, monitors their operational integrity, provides for automatic control of equipment, and transmits information necessary to prepare the facility for fire based on a predetermined sequence. Integrating FACP to BAS allows building manager web access to monitor fire control ancillary information remotely.

Security Alarm & Observation Control


securityalarmBy integrating these separate security systems under a flexible building automation system (BAS), building owners realize a lower upfront investment for a considerably more powerful security solution. Operational costs like administration and maintenance are also reduced. Component devices are used in multiple ways to trigger lighting, video capture, pan-tilt-zoom, higher video resolution or frame rate, door locks, and other aspects of building control.

HVAC & Mechanical Control


HVAC-MechanicalControlHVAC integrated Building Automation System (BAS) allows the building owners to have more control over the heating or cooling units. The building owner can monitor the system and respond to alarms generated by the system from local or remote locations. The system can be scheduled for occupancy or the configuration can be changed from the BAS for various required operational schemes. Sometimes the BAS is directly controlling the HVAC components, depending on the BAS different interfaces used. Many systems require the operation and monitoring of other mechanical plant operations such as electrically operated valves, chillers or heat pumps, circulating pumps and start stop of these devices and others depending on the systems being integrated in the facility operation. 

Electric Power Control


IEDElectric Power Control deals with automation related to routing electric power, controlling its quality, and controlling the devices attached to a power line as well as monitoring and alarming. The Intelligent Electronic Devices (IEDs), communications protocols, and communications methods, work together as a system to perform power-system control and automation.  


Integrated Lighting Control


integrated lightsLighting can be turned on, off, or dimmed with a building automation or lighting control system based on time of day, or on occupancy sensor, photo sensors and timers. Control and monitoring of advanced lighting control functions such as daylight harvesting allows the ability to take advantage of natural light from windows and skylights. Monitoring this through the BAS allows for improved tuning to get the most out of this often underutilized application.

 

 
 

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