Preview

Damper

Good Essays
Open Document
Open Document
408 Words
Grammar
Grammar
Plagiarism
Plagiarism
Writing
Writing
Score
Score
Damper
I. The first structure element of Taipei 101 is its tuned mass damper.
As we know, earthquake and typhoon always occur in Taipei [Video presentation: effect of earthquake]. On 12 May 2008 a province in China experienced an earthquake which the tremors to be felt in Taiwan. So what is the best way to protect the skyscraper from collapse when the disasters occur? As skyscraper Taipei 101 installs the tuned mass damper insert the building on at level 87th to 91th. A. To ensure the tuned mass damper can be use in longest period time, the suitable materials are selected. 1. The tuned mass damper consists of 41 circular steel plates each with height of 12.5cm welded together to form a 5.5m diameter sphere which weight 730 tons [Picture slide show presentation of tuned mass damper].

2. According to Kourakis (2005), massive wire cables is used to support the tuned mass damper become like pendulum.

3. According to Kelleher (n.d), the eight massive steel cables are acting like conventional spring to support the tuned mass damper and it also support by eight hydraulics to support at high amplitudes of oscillation. [Video presentation : how tuned mass damper work]

B. Tuned mass damper carries out the main function of avoiding Taipei 101 from collapse. 1. Tuned mass damper function when Taipei 101 hits by wind load and face earthquake by carry some responsibility, such as, to cut the vibration that hit Taipei 101 around 40%.

2. When Taipei 101 can face the typhoons and vibration from earthquake, by absorb this vibration then transmit it to the 8 hydraulic pistons to balancing it.

Listener relevance: By knowing the tuned mass damper, we can understand that the important of tuned mass damper for the skyscraper, to maintain the building from collapse and as attraction to the people. Although, the tuned mass damper need large space to install, but, it is very economical solution that can be used to absorb the vibration, by compare to the



References: 1. Venture,J (September 2007).Taipei 101 Project Review & Management. 2. Kelleher,W (n.d). TUNED MASS DAMPERS: STABLILIZING OUR STRUCTURES 3. Kourakis,I (2005). Structural Systems and Tuned Mass Dampers Of Super-Tall Buildings: Case Study Of Taipei 101

You May Also Find These Documents Helpful

  • Better Essays

    Physic Experiment 4

    • 1302 Words
    • 6 Pages

    which is determined by F = kx. Here k is the spring constant which is a quality particular to each…

    • 1302 Words
    • 6 Pages
    Better Essays
  • Satisfactory Essays

    Report1

    • 274 Words
    • 1 Page

    tower crane uses two mobile counterweights (CW), as well as a fixed counterweight (CW) on…

    • 274 Words
    • 1 Page
    Satisfactory Essays
  • Satisfactory Essays

    1. Determine the spring constant, k, of Spring 1, by using Hooke’s Law. Take three different measurements (since 3 masses) and do three calculations and average your k’s to get a more accurate answer. By applying lots of friction, you will be able to get your mass to hang still. Show a table of your data and your calculations of k.…

    • 402 Words
    • 2 Pages
    Satisfactory Essays
  • Powerful Essays

    the aftermath of damaging earthquakes. The first Australian Code AS2121-1979 was written and published after the 1968 Meckering WA earthquake. The second AS1170.4 1993 was published after the 1989 Newcastle NSW earthquake. Good quality Building Codes are a necessary basis for sound earthquake resistant designs. Both implementation and enforcement of the codes and sound robust construction in the field are essential for the protection of life and infrastructure. Also essential is the preservation and upgrading of the earthquake database. A study to assist the safer operation of emergency services immediately following damaging earthquakes is proposed.…

    • 6538 Words
    • 27 Pages
    Powerful Essays
  • Better Essays

    References: [1 ] US General Serv ice Adm inistration (GSA 2 003 ), “Progressiv e Collapse Analy sis and Design Guidelines for New Federal Office Buildings and Major Modernization Projects, 2 003 , USA” [2 ] IITK – GSDMA, “Guidelines on m easures to m itigate effects of terrorist attacks on buildings,” I ndian I nstitute of Technology, Kanpur & Gujarat State Disaster Management Authority, July 2 007 . [3 ] H.S. Lew, “Best practices guidelines for m itigation of building progressiv e collapse,” May 2 003 . [4 ] Bruce R. Ellingwood, “Mitigating risk from abnorm al loads and progressiv e collapse,” Journal of performance of constructed facilities / ASCE, pp. 3 1 5-3 2 3 , Nov . 2 006 . [5] National Institute of Standards and Technology (NIST), “Best practices for reducing the potential for progressive collapse in buildings” , U.S. Departm ent of Com m erce, Technology Adm inistration, NIST, U.S.A., August 2 006 . [6 ] United Facilities Criteria (UFC 4 -02 3 -03 ), “Design of buildings to resist the progressive collapse”, Departm ent of Defense, New York [7 ] Uwe Starossek, “Ty pology of Progressiv e Collapse”, Engineering Structures, Science Direct, Vol. 2 9 : 2 3 02 -2 3 07 , 2 007 7. Web Resources:…

    • 5084 Words
    • 21 Pages
    Better Essays
  • Powerful Essays

    1. Introduction Smart systems for civil structures are described as systems that can automatically adjust structural characteristics in response to external disturbances and/or unexpected severe loading toward structural safety, extension of the structure’s life time, and serviceability [26]. One key technology toward this goal is the development and…

    • 6218 Words
    • 25 Pages
    Powerful Essays
  • Good Essays

    The first thing to be explored to control vibrations is to try to alter the source so that it produces less vibration. This method may not always be feasible. Some examples of the sources of vibration that cannot be altered are earthquake excitation, atmospheric turbulence, road roughness, and engine combustion instability. On the other hand, certain sources such as unbalance in rotating or reciprocating machines can be altered to reduce the vibrations. This can be achieved, usually, by using either internal balancing or an increase in the precision of machine elements. The use of close tolerances and better surface finish for machine parts (which have relative motion with respect to one another) make the machine less susceptible to vibration. Of course, there may be economic and manufacturing constraints on the degree of balancing that can be achieved or the precision with which the machine parts can be made. The presence of an eccentric or unbalanced mass in a rotating disc causes vibration, which may be acceptable up to a certain level. If the vibration caused by an unbalanced mass is not acceptable, it can be eliminated either by removing the eccentric mass or by adding an equal mass in such a position that it cancels the effect of the unbalance. In order to use this procedure, we need to determine the amount and location of the eccentric mass experimentally. The unbalance in practical machines can be attributed to such irregularities as machining errors and variations in sizes of bolts, nuts, rivets, and welds. In this section, we shall consider two types of balancing:…

    • 521 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    Force and Spring Balance

    • 1931 Words
    • 8 Pages

    EXPERIMENT 3: BENDING MOMENT…………………………………10 EXPERIMENT 4: FORCES IN FRAME…………………………………..12 EXPERIMENT 5: HOOKS LAW…………………………………………..13 EXPERIMENT 6: MODULUS OF RIGIDITY…………………………….14…

    • 1931 Words
    • 8 Pages
    Satisfactory Essays
  • Good Essays

    The system comprises three major components a sand bed, a pair of concrete slabs, an arrey of springs and shock absorbers. A sand bed seismic absorption system is used to minimize and absorb the seismic waves during an earthquake. The system compromises of a bed of damp sand between two polymer membranes. The membrane consists of polyane, a flexible and durable material used mainly in trash bags and onsite construction. The polymer membrane also keeps the sand damp and maintains the moisture within. The reason for use damp sand is because the water forms “bridges that connect the sand particles”. The effect acts like rubberband between the grains. It is very important to maintain the moisture as too much water in the sand can form quick sand. Upon this sand bed is a concrete slab with many coil springs and shock absorbers and then a second concrete slab. The structure to be protected is placed on the second concrete slab. In the event of an earthquake, the sand bed acts to slow the propagation of seismic waves, and spreading them evenly throughout the area of the sand bed. As the seismic waves propagate through the sand, it has slowed enough for the coil springs to absorb the rest. The concrete slabs should be of a thickness and strength to bear the weight of the structure to be supported. For comparison a seismic wave that propagates through granite at a speed of a 4km/sec will be slowed to a speed of 300 m/sec in sand. The springs must be of sufficient size, strength and number to support the weight of the upper concrete slab as well as any structure to be supported. In a preferred embodiment the springs are compression coil spring made from high strength steel such as maraging steel. Maraging steel particularly suitable for springs of the invention comprises 18% nickel and 1-2% beryllium. In a preferred embodiment the maraging steel additionally comprises 0.5% bismuth to adapt the the…

    • 515 Words
    • 3 Pages
    Good Essays
  • Satisfactory Essays

    Control System Assignment

    • 386 Words
    • 2 Pages

    In many mechanical positioning systems, the movement of a large unwieldy object is controlled by manipulating a much smaller object that is mechanically coupled with it. The figure below depicts such a situation, where a force u is applied to a small mass ms in order to position a larger mass mb. The coupling between the objects is modeled by a spring constant k with a damping coefficient b. Denote x and y to be the displacements of the small and large masses…

    • 386 Words
    • 2 Pages
    Satisfactory Essays
  • Powerful Essays

    1 A 10 g slotted mass was hung from the thread and the function generator switched on with the frequency of the function generator set to 30 Hz. A wooden wedge was placed below the thread and next to the pulley.…

    • 1317 Words
    • 11 Pages
    Powerful Essays
  • Powerful Essays

    Earthquake is the shaking of the ground caused by the sudden breaking and shifting of large sections of Earth 's rocky outer shell. Earthquakes are among the most powerful events on earth, and their results can be terrifying. The force of an earthquake depends on how much rock breaks and how far it shifts. Powerful earthquakes can shake firm ground violently for great distances. During minor earthquakes, the vibration may be no greater than the vibration caused by a passing truck. In order to construct earth quake resistant structures we need to analyze the way in which buildings respond towards the vibrations…

    • 1807 Words
    • 8 Pages
    Powerful Essays
  • Powerful Essays

    Solid Mechanics

    • 1970 Words
    • 8 Pages

    Fig.2.1 shows a perfect pin-ended strut. This strut is assumed to undergo only axial loading and will remain in its elastic range prior to the critical load being reached. Deflection will only occur when the critical load is reached. Any deflections prior to this load are maintained inside the structure.…

    • 1970 Words
    • 8 Pages
    Powerful Essays
  • Powerful Essays

    References: Ambrose, J., & Vergun, D. (1995). Simplified Building for Wind and Earthquake Forces (Third Edition ed.). New York,NY, USA: John Wiley & Sons, Inc.…

    • 2545 Words
    • 11 Pages
    Powerful Essays
  • Powerful Essays

    Half Car Vehicle System

    • 14752 Words
    • 60 Pages

    Magneto Rheological Dampers”, Thesis submitted to the faculty of Virginia Polytechnic Institute and State University, September 23, 2002.…

    • 14752 Words
    • 60 Pages
    Powerful Essays