Bridge-Tendon Eccentricity in Ducts
Strand tendons tend to align at the inner face of duct when curved profile is used. Thus, the tendon is located near the bottom of the duct over th…
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Logarithmic Decrement
Logarithmic decrement is a way to determine the damping ratio of an underdamped system given the displacement response over time. Recalling that damp…
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Bridge-Creep and Shrinkage Losses
Concrete will also experience shortening due to creep and shrinkage. Similar to the effect of elastic shortening, stress loss occurs in tendons. …
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Bridge-Relaxation of Tendon
Relaxation of steel occur after the stressed tendon is anchored. This process leads to the reduction of tendon force over time. The amount of stres…
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Solution for Free Vibration of Damped SDOF System
This is an example showing the solution for a damped SDOF system subjected to free vibration. In this example, we demonstrate the way to calculate th…
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Bridge-Elastic Shortening of Concrete
During the stressing of tendon, the concrete may experience elastic shortening. This causes the stress loss in the tendon installed prior to this. In…
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Bridge-Tendon Extension
Knowing the graph of tendon force versus tendon ordinate, the extension of tendon during stressing can be determined by calculating the area under fo…
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Theory for Free Vibration of Damped SDOF System
From a situation where a damped SDOF system is subjected to free vibration, we can derive the definition for critical damping and the angular frequ…
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Bridge-Friction Losses
When stressed, tendons inside the ducting experiences friction losses. Two parameters are important for the calculation of friction losses: frictio…
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Bridge-Prestress Forces and Losses
Friction between the tendons and duct developed along its length and this causes the loss in tendon force. Other contributing factors in losses inc…
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Solution for Free Vibration of Undamped SDOF System
This is an example showing the solution for an undamped SDOF system subjected to free vibration. Using the components of dynamic system, we first d…
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Bridge-Influence Coefficient Method
Influence coefficient method implements theory of least work. For each interior support, a compatibility equation is established. By solving the si…
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