The cross section in Figure 1.1 is a simple span beam of 20 ft. The beam supports a dead load including its own weight of 1.0 kIf and a live load of 0.7klf. The concrete compressive strength fc = 3ksi. Required: (1) Calculate the instantaneous deflection for D+L. (2) Calculate the deflection assuming that 30% of the live load is continuously applied for three years. Compare the live load deflection to L/480 and the total deflection to L/240. Use the applicable deflection equation from figure 9-13. Review the lecture notes associated with this topic and chapter 9 of your book in detail. The steps involved in calculating instantaneous and long- term deflections are summarized below: 1. Compute the instantaneous or short-term deflection, delta D, for dead load only. Required: compute the cracked transformed section properties 1g, Mcr, Ma, lcr, le, Ec, and delta D. 2. Compute instantaneous deflection, delta D+L, for dead plus full live load. Required: Ma, le, and Delta D+L. 3. Determine instantaneous deflection, Delta L, for full live load only. Apply the following equation: 4. Compute instantaneous deflection due to dead load plus the sustained part of the live load, Delta D + Delta SL. Required: Ma, le, and Delta D + Delta SL. 5. Determine instantaneous deflection, Delta L, for the part of the live load that is sustained. 6. Determine the long-term deflection for dead load plus the sustained part of the live load, Delta LT. Required: determine using figure 9-16 and use the equations noted below

Subject | Mathematics |

Due By (Pacific Time) | 04/23/2015 05:36 pm |

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