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For the I-beam as shown in Figure Q4, determine the following using Castigiano's second theorem. Given the elastic modulus, E=200GPa. The moment of inertia, 1 is given in the American Standard for wide-flange shapes as shown in Table Q4. a) Kecerunan, b pada titik D The slope, 0 at point D (11 markah/marks) b) Cadangkan satu cara untuk mengurangkan kecerunan, 0. Suggest a way to reduce the slope, D. (1 markah/mark) c) Jika anda seorang jurutera struktur, bagaimanakah anda mengurangkan kos rasuk di bawah keadaan bebanan dan batasan yang sama? Diberi kecerunan maksimum, D yang dibenarkan adalah 3.15106 rad. Justifikasikan jawapan anda dengan pengiraan. Pilihkan suatu sebutan untuk rasuk itu daripada Jadual S4 yang paling sesuai dengan jawapan anda dalam pengiraan. If you were a structural engineer. how would you reduce the cost of the beam under the same loading and boundary conditions? Given the maximum allowable slope. D is 3.15 106 rad Justify your answer with calculations. Select a designation of the beam from Tabie Q4 that best fit your answer in the calculations (3 markah/marks)