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Department of Civil Engineering, Faculty of Engineering, Mahidol University<br />
EGCE 406: Bridge Design<br />
<strong>Homework</strong> 3 (Due Monday, September 10 th 2007)<br />
Assume the compressive strength of concrete is 350 ksc and the yield strength of the<br />
steel is 3000 ksc. Make any other assumptions as necessary.<br />
1. Determine the ultimate moment capacity per 1 linear meter width of a reinforced<br />
concrete one-way slab as shown below.<br />
If the design live load on the slab is 300 kg/m 2 . What is the maximum span length of<br />
the slab? Use the following load and resistance factors for the ultimate strength limit<br />
state (from ACI 318, 2002):<br />
φMn<br />
≥ Mu<br />
0.9M ≥ 1.2M + 1.6M<br />
n DL LL<br />
2. Determine the ultimate moment capacity of the following reinforced concrete<br />
beams:<br />
Compare the moment capacity between the two cases. How much the ultimate<br />
moment capacity increase or decrease when adding the compression reinforcement?
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