Download Earthquake-Resistant Design with Rubber by James M. Kelly PDF

By James M. Kelly

Base isolation know-how bargains an economical and trustworthy technique for mitigating seismic harm to buildings. The effectiveness of this new expertise has been proven not just in laboratory study, but additionally within the genuine reaction of base-isolated structures in the course of earthquakes. more and more, new and latest structures in earthquake-prone areas in the course of the international are using this leading edge approach. during this increased and up-to-date variation, the layout equipment and directions linked to seismic isolation are distinctive. the focus of the e-book is on isolation structures that use a damped common rubber. subject matters coated comprise coupled lateral-torsional reaction, the habit of multilayer bearings lower than compression and bending, and the buckling habit of elastomeric bearings. additionally featured is a piece protecting the hot alterations in development code requirements.

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Extra resources for Earthquake-Resistant Design with Rubber

Example text

Here, T is shown in decibels, defined as 20 log 10 T , and n as log IOn, illustrating the rate at which the transmissibility decreases with frequency at large frequency ratios. IO I . ". 5 3 Frequency ratio = cu/cuO Fig. 2-2: Transmissibility for a viscous damped system (linear plot) demonstrating that high-damping factors tend to reduce the effectiveness of the mount at high frequencies, although some damping is essential to avoid resonance at Q = 1. It is well known that the linear viscous model is not appropriate to model the behavior of rubber and rubber-like elastomeric materials.

2-7: Alternative forms for the frictional vibration isolator The initial conditions at the start of the cycle, t = 0, are x = Xo and i = 0, where Xo is the unknown maximum displacement. Using these initial conditions and solving for C I and C 2 gives Frictional Vibration Isolators 31 <1l E 1= ....... : ....... Vl c.. 8Vl '5 0 .... ~ 8 2Vl >-. Vl t>Il t:: ] Vl Q) .... c: 4-< 0 8Il

2-4, for example, the loss factor of natural rubber at 35°C is constant over a frequency range from 1 to 500 Hz, and the modulus is constant over a frequency range of 1 to 5000 Hz. When rubber is filled with carbon black, both the modulus and the loss factor are substantially increased, and the range over which they are constant is reduced. But as shown in Fig. 2-5, the approximation is still valid over a wide range of frequencies. 11) where Ko is the dynamic stiffness of the mount and is dependent on Go and the details of its design.

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