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Technical Papers

Review Our Complete Collection of Industry Technical Papers

We have compiled an extensive list of useful information and industry technical papers for your convenience. Whether you are interested in a case study from a recent projects, want to learn more about the latest trends from a white paper written by one of our engineers, or you’re a numbers junky and looking for technical brief, we have something for everyone.  

White Paper

18. SEISMIC CONTROL OF STRUCTURES WITH DAMPED RESONANT APPENDAGES

This paper shows how Tuned Mass Dampers can provide seismic protection for structures. These dampers consist of a relatively small mass, a spring, and a dashpot attached to a point of maximum vibration and in resonance with the structure to which they are attached. They are widely used to control the response of buildings, bridges, towers, chimneys and other structures to wind forces, machine vibrations and occupant activity. For the most part however, these dampers have been considered ineffective to reduce the seismic response of structures. This paper demonstrates that such devices can be used effectively to control the seismic response of structures. The paper presents a basic mechanism that explains under what conditions such dampers may work effectively under earthquake loads. It also provides recommendations for the selection of the mass, stiffness and damping factors. It includes the results of a series of numerical and experimental tests which verify that properly designed Tuned Mass Dampers effectively and consistently reduce the response of many types of structural systems to various types of earthquake excitations.

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Case Study

17. SAN BERNARDINO COUNTY MEDICAL CENTER REPLACEMENT PROJECT TECHNICAL SPECIFICATIONS

This specification covers the set of 186 fluid viscous dampers used on the five buildings of the new San Bernardino County Medical Center located in Colton, California. Three major faults are close to this location. The dampers operate in parallel with elastomeric base isolators, and reduce the required isolator stroke from +/- 48 inches to +/- 22 inches. This specification is very detailed and includes testing requirements.

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Case Study

16. ROCKWELL VISCOUS DAMPER SPECIFICATIONS

This specification covers the set of ten linear fluid viscous dampers along with their mounting brackets and pins for the Rockwell Building located at Jamboree Road and Birch in Newport Beach, California. These dampers provide an output force in either tension of compression that is directly proportional to the relative velocity between the two ends of the dampers. The damper output force varies only with velocity and does not change with damper stroke position or orientation angle. The function of the dampers is to absorb earthquake energy, thereby reducing the amount the building moves when an earthquake occurs.

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White Paper

15. REDUCTION OF SHOCK RESPONSE SPECTRA USING VARIOUS TYPES OF SHOCK ISOLATION MOUNTS

This experiment demonstrated how various types of shock absorbers can reduce the overall shock response spectra of a structure subjected to high impact shock. This was accomplished by measuring the acceleration on a weight dropped onto three different shock absorbers from various heights and analyzing the resulting data. A baseline test was performed with a steel hard mount. This was followed by tests with three different soft isolation mounts; a half inch thick neoprene pad, a urethane rubber tube on its side and a hydraulic liquid spring type shock absorber. Results show that both the dominant frequencies and the peak acceleration get lower as the isolation system gets softer. This information can be valuable in the design of isolation systems.

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Technical Brief

14. PRECISE POSITIONING SHOCK ISOLATORS

Conventional approaches to the shock isolation of delicate systems often involve the use of low frequency shock mountings. This type of mounting is not usable on systems where precise alignment must be maintained over a long period of time. This paper describes a new type of isolator which combines excellent attenuation with the ability to precisely maintain system alignment in the pre and post shock environment. This new shock absorber acts as a rigid link under normal conditions. Then, when a shock occurs, it strokes in both tension and compression with damping in both directions. After things calm down the shock returns precisely to its original length. Computer simulation and test results are included.

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White Paper

12. PASSIVE AND ACTIVE FLUID DAMPERS IN STRUCTURAL APPLICATIONS

Analytical and experimental results demonstrate that the performance improvements from active control systems can also be achieved with passive and semi-active fluid dampers. However, passive or semi-active fluid dampers offer the advantages of low cost, no or minimal demand for external power, longevity and reliability.

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Case Study

10. INVESTIGATION OF LIGHT POLE BASE INTEGRITY – RICH STADIUM

Light poles at Rich Stadium in Orchard Park, N.Y., were showing incipient failure of their hold-down bolts, due to wind excitation. This paper describes the measures used to alleviate this problem, including the addition of viscous dampers between the stadium structure and a point around one third up on the light poles.

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Technical Brief

6. Experimental Study of Structures with Supplemental Damping

A quarter scale model of a three story steel moment frame building was tested on a shake table using time histories from a large number of earthquakes including Taft, El Centro, etc. Tests were conducted both without dampers and with varying numbers of dampers. Test results correlated well with the analytical predictions. Conclusions; viscous dampers reduced story drifts by 30% to 70%. These reductions are comparable to those achieved by other energy dissipating systems such as viscoelastic, friction and yielding steel dampers. However, the use of fluid dampers also reduced story shear forces by 40% to 70%, while other energy absorbing devices showed no significant reduction.

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Product Info

4. Earthquake Protection Systems

Taylor Devices, Inc. has been the leader in shock and vibration technology since 1955. Now, we have boldly stepped into the forefront of one of civil engineering’s greatest challenges: Seismic protection of buildings, bridges, historical structures, and even residential dwellings. Extensive research has been conducted in a joint effort with the National Center for Earthquake Engineering Research (NCEER), located at the State University of New York at Buffalo. A practical approach has been developed for dissipating energy from a structure by the addition of Taylor Devices’ unique Fluid Viscous Dampers. The most noteworthy features include a maintenance-free design proven by years of usage by the Military, “fail-safe” construction which insures safe operation for the life of the building or bridge, and significantly lower cost than conventional methods.

Taylor Devices’ Fluid Viscous Dampers can be incorporated into a newly designed structure or retrofit to existing structures to extend their ability to survive seismic events. The linear output of these devices allows ease in structural analysis using existing software codes.

This data book includes answers to the questions most frequently asked about the use of viscous damping in a structure. Application and sizing information is also provided. For more information about a custom designed seismic protection system for your specific application, please do not hesitate to contact us at our factory. Our staff of highly qualified experts is ready to help you.

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Product Info

3. Commentary on Corrosion

This document shows designers how to avoid corrosion due to the interaction of different metals and alloys at bimetallic contacts. Section one describes the conditions that lead to corrosion at bimetallic contacts and methods to alleviate it. The tables in Section two show the degree of corrosion likely to occur at bimetallic contacts exposed to atmosphere and water.

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White Paper

2. Bridge Design

This paper reports on a non-linear analysis of a bridge supported on sliding bearings with elastomeric restoring spring and viscous dampers. Results were verified with shake table tests.

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Product Info

1. Application of Energy Dissipating

The design of a structure or mechanism subjected to shock and vibration can be greatly improved by the addition of isolation or damping devices. Improvements Include: Reduced Deflection and Stresses, Reduced Weight, Improved Biodynamics, Longer Fatigue Life, Architectural Enhancement and Reduced Cost.

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