Hailey Tran
Earthquakes can cause major damage to structures, jeopardizing people's lives. Hospitals, which play a crucial role in communities, especially during disasters, must meet stringent design and construction standards in seismically active regions. To ensure the safety of patients and staff during earthquakes, hospitals are increasingly adopting innovative base isolation systems, which act like springs and shock absorbers in a car, reducing seismic impact. While this technology has proven effective in protecting hospitals and other critical infrastructure, it is costly and complex, and more research is needed to fully understand its potential. As earthquake predictions loom over densely populated areas, the race is on to fortify medical facilities against nature's wrath.
| Characteristics | Values |
|---|---|
| Reason for building hospitals on springs | To protect patients and staff from injury and keep the hospital operational following a potentially disastrous earthquake |
| Base isolation system | Absorbs or dampens the force that hits the building, allowing the building to move independently of the foundation |
| Base isolators | Stiff rubber or friction bearings, steel, rubber and lead pads, orbital-shaped pedestals, sliding bearings, dampers, vertical shock absorbers |
| Effectiveness | Buildings on base isolators suffered very little damage compared to buildings constructed with older seismic methods |
| Challenges | Complexity, expense, creation of a large seismic joint at the isolation plane |
| Examples | USC University Hospital, Ronald Reagan UCLA Medical Center |
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What You'll Learn
- Base isolation systems are designed to work like springs and shock absorbers in a car
- Base isolators can cost tens of millions of dollars to install
- Buildings with base isolators suffered little damage in the Fukushima earthquake
- The 1971 Sylmar-San Fernando earthquake killed at least 44 people at a hospital
- California hospitals have stricter seismic safety standards after devastating quakes
Base isolation systems are designed to work like springs and shock absorbers in a car
Earthquakes can cause significant damage and even lead to catastrophic consequences, especially in densely populated areas. To mitigate the impact of earthquakes on structures, base isolation systems have been developed. These systems are designed to work like springs and shock absorbers in a car, softening the seismic impact and allowing buildings to ride out earthquakes.
Base isolation is a seismic-resistant construction technique that involves placing a weak surface or base isolators beneath a structure to limit the shear force transmitted to it during an earthquake. This allows the building to slide or sway over the ground without collapsing. The concept is similar to how springs and shock absorbers in a car smooth out the ride by dampening vibrations and shocks.
The USC University Hospital in Los Angeles, which opened in 1991 as the nation's first base-isolated hospital, demonstrated the effectiveness of base isolation systems during the Northridge quake. The base isolation system absorbed about two-thirds of the force that hit the eight-story building, preventing significant structural damage and allowing the hospital to remain operational.
Base isolation systems typically consist of ball bearings, springs, and padded cylinders that absorb shocks and vibrations. These systems can be designed using various materials, such as steel, rubber, and lead pads, which help ensure the equipment and supplies inside the building survive the earthquake. Lead, for example, is chosen for its plasticity, allowing it to deform and revert to its original shape multiple times without losing strength.
While base isolation systems offer promising solutions for seismic safety, they also have limitations. For instance, they may not be suitable for taller buildings due to their limited ability to cope with tension, and they require careful consideration of utility connections to accommodate large lateral movements. Additionally, the technology can be costly, and further research is needed to fully understand its effectiveness in various conditions.
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Base isolators can cost tens of millions of dollars to install
Base isolators are devices installed directly underneath a structure to absorb earthquake shocks and prevent them from entering the building. They work similarly to the springs and shock absorbers in a car, softening the seismic impact.
Base isolation systems are designed to keep buildings operational following an earthquake, reducing earthquake forces by as much as 80%. This technology was first developed in Japan, where it has proven its ability to withstand major earthquakes. After the Fukushima earthquake in 2011, for example, buildings with base isolators suffered minimal damage compared to those constructed with older seismic methods.
Despite the clear benefits of base isolators, the technology can be costly. Base isolators can cost tens of millions of dollars to install, and this expense is often balanced out by the reduced seismic forces in the structural frame. For tall buildings, base isolation is impractical, and mid-story seismic isolation is sometimes used instead. This involves placing the isolation system at a higher level within the building, which is more expensive than traditional base isolation systems due to the added engineering complexities.
The high cost of base isolators is a significant consideration, especially given the potential for damage to buildings and their contents even with seismic protection in place. Traditional earthquake protection methods allow a building to sway during an earthquake and then revert to its original form. While this protects the structure, the contents inside can still be damaged by the excessive movement. Base isolators aim to address this issue by minimising movement and protecting both the internal and external elements of a building.
The decision to invest in base isolators must consider the potential costs and benefits. While base isolators can help prevent structural damage and keep critical facilities operational during an earthquake, they come at a significant upfront cost. This cost must be weighed against the potential losses from earthquake damage, including structural repairs, downtime, and content damage.
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Buildings with base isolators suffered little damage in the Fukushima earthquake
Earthquakes can be extremely destructive, causing thousands of injuries and deaths, and damaging buildings and infrastructure. In the aftermath of earthquakes, hospitals are often left disabled, unable to provide critical care to those who need it.
To mitigate the impact of earthquakes on hospitals, base isolation systems have been developed. These systems, first pioneered in Japan, utilise base isolators, which are installed under the building to decouple the structure from the earthquake motions. The base isolation system works like the springs and shock absorbers in a car, softening the seismic impact and allowing the building to ride out a major earthquake.
The USC University Hospital in Los Angeles, which was built on a base isolation system, demonstrated the effectiveness of this technology during the Northridge quake. The system absorbed about two-thirds of the force that hit the eight-story building, allowing it to withstand the earthquake with minimal damage.
Base isolators have also proven effective in major earthquakes outside of the United States. During the massive Fukushima earthquake in 2011, buildings constructed with base isolators suffered very little damage compared to buildings built with older seismic methods. This highlights the potential of base isolation systems in protecting critical structures, ensuring they remain operational even after a major earthquake.
While base isolation systems offer a promising solution for earthquake-resistant design, they are not yet widely adopted. As of 2019, only about 300 buildings and bridges worldwide use this technology, with most of them located in California. The high cost of implementing these systems, which can run into tens of millions of dollars, is a significant factor in their limited adoption. However, with the increasing frequency and severity of earthquakes, the need for resilient infrastructure, including hospitals, becomes ever more critical.
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The 1971 Sylmar-San Fernando earthquake killed at least 44 people at a hospital
The 1971 Sylmar-San Fernando earthquake, which occurred in the early hours of February 9, was responsible for numerous deaths and injuries. The unanticipated thrust earthquake, with a magnitude of 6.5 on the Mw scale, caused extensive damage in the northern San Fernando Valley and surface faulting in the mountains south of the epicenter. The event particularly affected healthcare facilities in densely populated areas north of central Los Angeles, including the Olive View Medical Center and the Veterans Hospital, where the majority of deaths occurred.
The San Fernando Veterans Administration Hospital suffered severe structural damage during the earthquake, resulting in the deaths of at least 44 people. The unreinforced concrete wings of the hospital collapsed, and the shaking ruptured a water main, causing the fire sprinklers to leak. The loss of life directly attributable to the earthquake was 58, excluding heart attacks and other health-related deaths. Most of these fatalities occurred at the Veterans Hospital and the Olive View hospital complexes, with additional deaths at private residences, highway overpass collapses, and a ceiling collapse at the Midnight Mission in downtown Los Angeles.
The 1971 Sylmar-San Fernando earthquake highlighted the vulnerability of hospitals and the need for improved seismic safety standards. In the aftermath of the earthquake, lawmakers acted quickly to develop legislation related to seismic safety, recognizing the importance of ensuring that hospital buildings can withstand major earthquakes without collapsing. This event served as a stark reminder that hospitals are particularly vulnerable to earthquake damage due to the critical nature of their operations and the potential for high casualty counts.
To enhance the seismic resilience of hospitals, various measures have been implemented. One notable innovation is the base isolation system, which has been hailed for its effectiveness in reducing the impact of earthquakes on structures. This system, inspired by the springs and shock absorbers in automobiles, is designed to soften the seismic impact on buildings. By separating the building from its foundation through the use of isolators, the base isolation system allows the structure to move independently during an earthquake, reducing the force transferred to the building. This technology has been successfully implemented in hospitals, including the USC University Hospital, which sustained minimal damage during the Northridge quake thanks to its base isolation system.
While the base isolation system shows promising results, some engineers emphasize the need for further research. They caution against recommending widespread installation without comprehensive understanding, as the system's performance in larger earthquakes remains uncertain. Additionally, the high cost associated with implementing such systems poses a challenge, especially with the upcoming stringent requirements in seismic safety standards. Nevertheless, the base isolation system and other seismic safety measures are crucial steps toward protecting hospitals and saving lives during earthquakes.
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California hospitals have stricter seismic safety standards after devastating quakes
California is one of the most earthquake-prone states in the US, and its hospitals have a long history of damage and destruction due to seismic activity. The San Fernando Veterans Administration Hospital, for instance, suffered extensive damage during the 1971 Sylmar-San Francisco earthquake, resulting in the deaths of 44 people. The Northridge quake in 1994 injured over 7,000 people and severely impacted hospitals in the Los Angeles area. The Olive View-UCLA Medical Center, though not structurally damaged, had to be evacuated due to a ruptured water main and leaking fire sprinklers.
In response to these devastating earthquakes, California has implemented stricter seismic safety standards for its hospitals. The state passed the Hospital Seismic Safety Act in 1972, requiring hospitals to have special seismic detailing to withstand earthquakes with minimal damage. The design, construction, and maintenance of California's hospitals are governed by stringent regulations and standards aimed at ensuring hospital functionality and patient safety during and after a major earthquake. The standards include plan review, design approval, continuous construction inspection, materials testing, and strict monitoring of all construction projects.
One notable example of California's improved seismic safety standards is the base isolation system, which has been hailed for its effectiveness in reducing the impact of earthquakes on hospitals. The USC University Hospital, which utilised this system, sustained only moderate damage during the Northridge quake, absorbing two-thirds of the force that hit the eight-story building. The base isolation system, designed to work like springs and shock absorbers in a car, has proven its ability to withstand major earthquakes, such as the Fukushima earthquake in 2011.
Despite the progress, hospitals in California continue to face challenges in meeting seismic safety standards. The costs of retrofitting or replacing existing buildings to comply with regulations are significant, especially for smaller facilities with limited resources. The state's seismic safety laws mandate that hospitals must either upgrade or replace their buildings to ensure safety, with non-compliant buildings forced to cease operations. While most hospitals have met the initial deadlines, some have struggled to secure the necessary funding for upgrades, highlighting the ongoing struggle to balance safety requirements with financial constraints in the healthcare sector.
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Frequently asked questions
Yes, some hospitals are built on springs to protect them from earthquakes. This is called a base isolation system and it works in a similar way to the springs and shock absorbers in a car.
A base isolation system involves placing a series of stiff rubber or friction bearings between the structure and its foundation. The stiffness of these bearings can be calibrated to reduce the impact of seismic forces on the building.
Yes, one alternative is to use steel beams designed to enable the building to withstand a major earthquake. Another option is to invest in new infrastructure that can continue to operate even if electricity and water are disrupted.
Yes, base isolation systems can be complex and expensive to implement. They also create a large seismic joint at the isolation plane to accommodate the movement of the building on the bearings.
Yes, the USC University Hospital in Los Angeles remained operational after the Northridge quake in 1994 due to its base isolation system. The system absorbed or dampened about two-thirds of the force that hit the building.
