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Monday, November 30, 2020 | History

3 edition of Active control of buildings during earthquakes found in the catalog.

Active control of buildings during earthquakes

Vicki L. Vance

Active control of buildings during earthquakes

  • 267 Want to read
  • 10 Currently reading

Published by National Aeronautics and Space Administration, Langley Research Center, National Technical Information Service, distributor in Hampton, Va, [Springfield, Va .
Written in English

    Subjects:
  • Earthquake engineering.

  • Edition Notes

    StatementVicki L. Vance.
    SeriesNASA technical memorandum -- 109033., NASA technical memorandum -- 109033.
    ContributionsLangley Research Center.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL14704224M

      During this long time-span, buildings are subjected to several natural (earthquake, hurricane, tsunamis etc.) and manmade (fire, explosion etc.) hazards which can cause partial or complete collapse of the building, and incapacitation of building operations.   The goal of creating earthquake-proof buildings is not static. Researchers estimate how future earthquakes might impact a building by observing active faults. But the magnitude of earthquakes in. The focus of the study, a magnitude quake near Prague, Oklahoma, damaged 14 homes and other structures in the area. States aren’t doing enough In Oklahoma, where the number of earthquakes magnitude or more has jumped from an average of less than five a year to ab the state has been slow to act.


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Active control of buildings during earthquakes by Vicki L. Vance Download PDF EPUB FB2

The book investigates the pounding effects on base-isolated buildings, the soil-structure-interaction effects on adjacent buildings due to the impact, the seismic protection of adjacent buildings and the mitigation of earthquakeinduced vibrations of two adjacent by: 3.

Year Published: Putting down roots in earthquake country-Your handbook for earthquakes in the Central United States. This handbook provides information to residents of the Central United States about the threat of earthquakes in that area, particularly along the New Madrid seismic zone, and explains how to prepare for, survive, and recover from such events.

This book employs exaggerated deformation shapes to emphasise deformations, and thereby, to develop the most needed intuition of structural behaviour of buildings during earthquakes and its consequences on earthquake-resistant design. The book contains animations related to behaviour of the various buildings models used in this work.

building construction during an intense earthquake. Seismic Actions Lateral forces excited in a building by an earthquake motion are influenced by the characteristics of ground motion, mass and stiffness distribution of the structure, and strength and deformation capacities of structural members.

Characteristics of Earthquake Motion. building being damaged by earthquakes, and Steps you can take to correct these weaknesses. There are no guarantees of safety during earthquakes, but properly constructed and strengthened commercial buildings are far less likely to collapse or be damaged during earthquakes.

The California Seismic Safety Commission advises you to act on the File Size: 1MB. • Share the potential impact of earthquakes—most injuries are caused by people falling while trying to walk or run during the shaking or being hit by falling, sliding, or flying household items and/or debris.

Earthquakes occur without warning and can cause buildings to. Move away from buildings, utility wires, sinkholes, and fuel and gas lines.

The greatest danger from falling debris is just outside doorways and close to outer walls of buildings. Go to an open area away from trees, telephone poles, and buildings. Once in the open. Active control systems include active tuned mass dampers, distributed actuators, active tendon systems and active coupled building systems.

Semi-active control systems include: magnetorheological (MR) fluid dampers, semi-active stiffness dampers, semi-active tuned liquid column dampers, and piezoelectric dampers.

Even with a base-isolation system in place, a building still receives a certain amount of vibrational energy during an earthquake. The building itself can dissipate, Active control of buildings during earthquakes book damp, this energy Active control of buildings during earthquakes book some extent, although its capacity to do this is directly related to the ductility of the material used in the construction.

Seismic risk. Table 1 illustrates how earthquakes in the Indian subcontinent continue to cause unacceptably large number of deaths. The main cause of fatalities in earthquakes in India is collapse of buildings. The number of deaths in an earthquake depends on shaking intensity, vulnerability of the building stock, time and season of the earthquake (whether people will be indoors.

This book explains concepts in behaviour of buildings during earthquakes. The book dwells on basic concepts in earthquake resistant design of buildings, first describes these at a conceptual level.

Introducing important concepts in the study of earthquakes related to retrofitting of structures to be made earthquake resistant. The book investigates the pounding effects on base-isolated buildings, the soil-structure-interaction effects on adjacent buildings due to the impact, the seismic protection of adjacent buildings and the mitigation of earthquakeinduced vibrations of two adjacent.

STRENGTHENING OF BUILDINGS INTRODUCTION The need to improve the ability of an exist-ing building to withstand seismic forces arises usually from the evidence of dam-age and poor behaviour during a recent earthquake. It can arise also from calcula-tions or by comparisons with similar build-ings that have been damaged in other places.

Control Systems for Seismic Protection of Structures – Seminar. Submitted By: Mahesh Chand Sharma. Introduction. Civil engineering structures located in environments where earthquakes or large wind forces are common will be subjected to serious vibrations during their lifetime. Issues And Structural Design Challenges for Earthquake Resistant Buildings.

There is an often-repeated saying, "earthquakes don't kill people, buildings do." Although you can’t control the seismic hazard in the community where you live or work, you can influence the most important factor in saving lives and reducing losses from an earthquake: the adoption and enforcement of up-to-date building codes.

Earthquake-resistant or aseismic structures are designed to protect buildings to some or greater extent from earthquakes. While no structure can be entirely immune to damage from earthquakes, the goal of earthquake-resistant construction is to erect structures that fare better during Seismic activity than their conventional counterparts.

Some seismically active areas impose height restrictions on buildings to decrease the possibility of building failure during an earthquake. Although the phenomenon of resonance can be extremely damaging, its effects can be reduced.

In designing seismically safe buildings, an architect or engineer must be concerned with “tuning”. If the building has a couple of very short columns, then during an earthquake they will end up taking more loads and collapse because of this high shear demand and very low displacement capacity.

If there is a presence of the weak story, a story that has a stiffness less than compared to adjacent stories will drift way more than other stories. Watch Buildings Move During Earthquakes Real videos of buildings shaking during real earthquakes, and some re-creations.

Shaking of Frontier Building - Anchorage, Alaska, During Mw Earthquake, Janu This video presents a visualization of shaking that was recorded in the Frontier Building in Anchorage, Alaska, during the Mw 2 Introduction • Earthquakes represent the vibration of Earth because of movements on faults.

• The focus is the point on the fault surface where motion begins. • The epicenter is the point on Earth's surface directly above the focus. The deadly Izmit earthquake struck northwest Turkey on Augat 3 a.m.

O residents of the region were killed as poorly constructed. Among all these buildings the major utilized technology is mass damping systems (e.g., TMD, TLD, TLCD) given that the major threat for tall buildings is generally wind. On the contrary, for tall buildings located in high seismic zones the utilization of distributed damping system (e.g., viscous, viscoelastic, etc.) becomes more common.

Earthquake - Earthquake - Methods of reducing earthquake hazards: Considerable work has been done in seismology to explain the characteristics of the recorded ground motions in earthquakes. Such knowledge is needed to predict ground motions in future earthquakes so that earthquake-resistant structures can be designed.

Although earthquakes cause death and destruction through such. Made by Earthquake Protection Systems, a company based in California, the devices isolate the steel frame of the building from the shaking of the ground and foundation during an earthquake. Jim. During the infamous Kobe earthquake, the building—which was just 19 miles from the epicenter—experienced severe ground motion.

Fortunately, the postal center wasn’t damaged. This Chapter discusses earthquake per-formance of structures during earthquake intensity, ground shaking effects on struc-tures, site condition effects on building damage, other factors affecting damage, 2 IAEE M ANUAL failure mechanisms of structures, earth-quake damage and.

Earthquake engineering is an interdisciplinary branch of engineering that designs and analyzes structures, such as buildings and bridges, with earthquakes in mind.

Its overall goal is to make such structures more resistant to earthquakes. An earthquake (or seismic) engineer aims to construct structures that will not be damaged in minor shaking and will avoid serious damage or collapse in a.

What to do during an earthquake Drop, cover, and hold on. Move only a few steps to a nearby safe place. Most injured persons in earthquakes move more than five feet during the shaking. Buildings in seismically active areas, however, must be designed and built to withstand the dynamic acceleration that can occur during an earthquake.

Large buildings and structures such as bridges, in particular, must be designed so that vibrations arising from earthquakes are damped and not amplified.

For new buildings, anti-seismic technology is today considered quite advanced and it is possible to build individual structures that can withstand the vast majority of recorded earthquakes. Instead, engineering intention is to make buildings earthquake resistant, such building resists the effects of ground shaking, although they may get damaged severely but would not collapse during the strong earthquake.

Thus, safety of peoples and contents is assured in earthquake resistant buildings and thereby, a disaster is avoided. If you must leave a building after the shaking stops, use stairs rather than an elevator in case of aftershocks, power outages or other damage. Be aware that smoke alarms and sprinkler systems frequently go off in buildings during an earthquake, even if there is no fire.

If you smell gas, get out of the house and move as far away as possible. Throughout the 20 th century, the intent of seismic design in building codes was to avoid earthquake-induced damage that would pose a significant risk to safety while still permitting economical designs.

Thus, building code provisions were developed that would permit some damage to occur, but protect against damage likely to lead to either local or partial collapse, or the generation of. DESIGN OF STRUCTURAL VIBRATION CONTROL USING SMART MATERIALS AND DEVICES FOR EARTHQUAKE-RESISTANT AND RESILIENT BUILDINGS A Thesis Submitted to the Graduate Faculty.

The sway helps to dissipate energy from the seismic waves. Through structural design, material selection, and construction techniques, engineers have tried to reduce the effect of earthquakes on buildings.

One such example is a tuned mass damper, a device installed in buildings to reduce harmonic resonance. In an earthquake, if you are on an upper story of a building, do not try to leave the building during the earthquake. After the earthquake, I. Many provisions in the building standards, if implemented, are intended to ensure that structures can adequately resist seismic forces during earthquakes.

Building standards in some parts of the world are based on the required performance of a particular building in a future earthquake event.

Building Configuration. The geometry and shape of a building also play a role in how a building behaves during an earthquake. Buildings with regular plans, whether they are round, square, or rectangular, have a greater resistance to damage during an earthquake because their geometry allows for equal resistance of lateral forces in all directions.

This book explains concepts in behaviour of buildings during earthquakes. The book dwells on basic concepts in earthquake resistant design of buildings, first describes these at a conceptual level and then articulates further with numerical examples.

It is an attempt to respond to some of the frequently asked questions by Architects and Structural Engineers regarding behaviour of. Seismic retrofitting is the modification of existing structures to make them more resistant to seismic activity, ground motion, or soil failure due to better understanding of seismic demand on structures and with our recent experiences with large earthquakes near urban centers, the need of seismic retrofitting is well acknowledged.

Prior to the introduction of modern seismic. Because shorter buildings are stiffer than taller ones, a three-story apartment house is considered more vulnerable to earthquake damage than a story skyscraper.

When planning the seismic safety of a building, structural engineers must design the support elements of shorter buildings to withstand greater forces than those of taller buildings. Its motion during a is shown here, along with a great narrative explanation.

Similarly, the Factor Health Sciences building at UCLA has multiple accelerometers on every floor, giving an amazingly precise view of the building’s motion during earthquakes. It’s been through plenty, and each one gets an animation. Sensitivity Analysis of Reinforced Concrete Frame Structures Under Near-Fault Pulse-Like Ground Motions Using a Broadband Simulation Method Fujian Yang, Guoxin Wang & Yang Ding Pages: