Fixed connections at the base of columns member

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Fixed connections at the base of columns Member Maximum Positive Shear (k) Maximum Negative Shear (k) Maximum Positive Moment (k-ft) Maximum Negative Moment (k-ft) AB 18.15 NONE 265.2 -25.13 BC 1.039 NONE NONE -14.32 CD 27.75 -12.25 51.75 -140.7 DE 18.96 NONE 86.82 -140.7 EF 21.85 NONE 282.99 -66.33 BE 28.84 -11.16 54.24 -153.4 Discussion: The reactions at the pin supports do not have significant change by changing the moments of inertia. But, the reactions changed when the pin supports were changed to fixed supports. The change in the moment of inertia to 6I greatly affected the moment values and the displacements. It showed an increase in the moment values. There was not much change in the shear values when the moment of inertia was increased from I to 6I. Question 2: a) Constant I Member Shear (k) Max positive moment (k-ft) Max negative moment (k-ft) AE -7.12 58.72 -83.67 BF -8.26 73.86 -91.44
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CG -8.58 77.70 -93.99 DH -6.03 42.83 -77.77 EF -5.62 25.69 -58.72 FG -5.05 19.18 -48.17 GH -6.19 42.83 -58.52 b) 4I for both middle columns Member Shear (k) Max positive moment (k-ft) Max negative moment (k-ft) AE -3.71 30.38 -43.80 BF -11.07 72.41 -148.90 CG -11.30 73.92 -152.1 DH -3.93 32.02 -46.49 EF -2.15 34.17 -30.38 FG -2.56 38.51 -38.23 GH -2.25 32.02 -35.41 c) 4I for both outer columns Member Shear (k) Max positive moment (k-ft) Max negative moment (k-ft) AE -9.49 41.35 -148.5 BF -5.19 47.42 -56.41 CG -5.30 48.54 -57.58 DH -10.01 43.44 -156.8 EF -2.36 29.49 -41.35 FG -1.19 17.97 -17.93 GH -2.46 43.44 -30.58 d) Reducing middle bay span from 30ft to 15ft Member Shear (k) Max positive moment (k-ft) Max negative moment (k-ft) AE -6.14 46.79 -76.07 BF -8.74 81.39 -93.42 CG -8.80 82.01 -94.04 DH -6.31 48.03 -78.25 EF -2.73 35.28 -46.79 FG -6.14 46.11 -46.11 GH -2.79 48.03 -35.90
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e) Reducing the exterior bays to 15ft Member Shear (k) Max positive moment (k-ft) Max negative moment (k-ft) AE -6.91 60.14 -78.17 BF -7.94 73.82 -85.08 CG -8.05 74.83 -86.20 DH -7.08 61.60 -80.14 EF -7.41 51.11 -60.14 FG -1.51 22.79 -22.71 GH -7.57 61.60 -52.04 Discussion: The change in moment of inertia mostly affects the moment values. The two middle columns have a higher moment value when the moment of inertia is 4I while the outer columns reduce in their moment value. Similarly, the outer columns show higher moment values when their moment of inertia is increased to 4I while the middle columns reduce in their moment values. There were slight changes in the shear values when the moment of inertia of the columns was changed to 4I. The change in the distance between the columns only show slight change in the moment value but it still depends on the moment of inertia.
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