Question Category 1 In case of buckling, the dispersion of load from bearing plate to neutral axis takes place at Correct Feedback: Incorrect Feedback: Choose one answer. 1. 30 degree Feedback: 2. 60 degree Feedback: 3. 45 degree Feedback: 4. 10 degree Feedback: 2 If 18 mm rivets are used in lacing bars, then minimum width of lacing bars should be Correct Feedback: Incorrect Feedback: Choose one answer. 1. 45 mm Feedback: 2. 50 mm Feedback: 3. 55 mm Feedback: 4. 60 mm Feedback: 3 To keep the intensity of bearing pressure between the column base and concrete, compressive through the length of the column base, the ratio of the moment M to axial load P should be Correct Feedback: Incorrect Feedback: Choose one answer. 1. L/3 Feedback: 2. L/6 Feedback: 3. L/3 Feedback: 4. L/6 Feedback: 4 The slenderness ratio of lacing bars should not exceed Choose one answer. 1. 100 2. 120 3. 180 4. 145 5 The most critical consideration in the design of rolled steel columns carrying axial load is the Choose one answer. 1. percent elongation at yield and the net cross-sectional area 2. critical bending strength and axial yield strenght of the material Page 1
3. buckling strength based on the net area of the section and percent elongation at ultimate load 4. compressive strength based on slenderness ratio and gross cross-sectional area of the member 6 The effective length of a battened column is increased by Choose one answer. 1. 10% 2. 7% 3. 12% 4. 25% 7 Identify the false statement. Correct Feedback: Correct Incorrect Feedback: Incorrect Choose one answer. 1. In the case of an axially loaded column machined for full bearing, the fastenings connecting the column to the base plate in gusseted base are designed for 50% of the column load. Feedback: Incorrect 2. The effective rigid plate allows use of a plastic distribution of the internal forces for calculations at the ultimate limit state. Feedback: Incorrect 3. The thickness of column flange should be greater than the thickness of gusset plate. Feedback: Correct 4. The size of gusset angles should be such that the vertical leg can accommodate two lines of bolt and other leg one. Feedback: Incorrect 8 Angle of inclination of the lacing with the longitudinal axis of the column should preferably be between Choose one answer. 1. 10 to 30 degree 2. 30 to 80 degree 3. 40 to 70 degree 4. 20 to 70 degree 9 A column splice is used to increase Correct Feedback: Incorrect Feedback: Choose one answer. 1. length of column Feedback: 2. strength of column Feedback: 3. cross-sectional area of column Feedback: 4. none of these Feedback: 10 A column base is subjected to moment. If the intensity of bearing pressure due to axial load is equal to stress due to moment, then the bearing pressure between the base and concrete is Correct Feedback: Incorrect Feedback: Page 2
Choose one answer. 1. uniform compression through Feedback: 2. zero at one end and compression at other end Feedback: 3. tension at one end and compression at other end Feedback: 4. uniform tension through Feedback: 11 Pick out the incorrect statement. Choose one answer. 1. The effective slenderness ratio of the laced column should he increased by 5%. 2. The effective length of a single-angle discontinuous strut connected by more than one bolt or weld is the same. 3. The slenderness ratio of compression members is limited to take into account unexpected vibrations. 4. Compression members are designed using Merchant Rankine formula. 12 Pick up the correct statement. Choose one answer. 1. The function of lacing bars is to equalize the stress distribution in the component members of the column. 2. The buckling strength of laced column is smaller than that of solid column. 3. Laced columns are economical than battened columns. 4. All the above. 13 The members in compression are susceptible to a number of possible buckling modes including (i) Plate buckling (ii) Flexural buckling (iii) Torsional buckling (iv) Torsional flexural buckling (v) Local strength at points of loading Choose one answer. 1. (ii),(iii) and (iv) 2. (i),(ii),(iii) and (iv) 3. (ii),(iii),(iv) and (v) 4. All of them 14 For a strut with given length and end conditions, the max compressive load carrying capacity for the same cross section area and same thickness is provided by Correct Feedback: Incorrect Feedback: Choose one answer. 1. solid section Feedback: 2. Circular hollow section Feedback: 3. Rectangular box(hollow) section Feedback: 4. Square box section Feedback: 15 Page 3
Identify the correct statement(s) ; (i)The cross section are classified to determine the extent or influence of local buckling on the section capacity. (ii)The effective length of a member is the length of an equivalent hinged hinged member.(iii) The section is selected so that the difference in two slenderness is the least ; the larger one is used to determine the design stress. (iv) The section is so oriented that the axis of smaller radius of gyration should be braced one. Correct Feedback: Incorrect Feedback: Choose one answer. 1. (i),(ii)& (iii) Feedback: 2. (ii),(iii) & (iv) Feedback: 3. (i),(ii) & (iv) Feedback: 4. All of them Feedback: 16 Identify the false statement Correct Feedback: Incorrect Feedback: Choose one answer. 1. Columns supporting predominantly axial loads are considered to be pin ended. Feedback: 2. The coefficient of friction at the interface between steel base and concrete may be taken as 0.45. Feedback: 3. Grout is provided on the underside of the base plate to disperse the force satisfactorily on to the foundation. Feedback: 4. The max bearing pressure between the base plate and the support underneath should not exceed 0.6 fck, where fck is smaller of characteristic cube strength of concrete or bedding material. Feedback: 17 Identify the false statement Correct Feedback: Incorrect Feedback: Choose one answer. 1. The stress reduction factor for an axially loaded compression member depends upon residual stress, initial crookedness, accidental eccentrities of load and type of cross section. Feedback: 2. A short column can support same load in compression as it can in tension. Feedback: 3. The best location to splice a column is at beam column junction. Feedback: 4. The effective length factor K of columns in braced frames is smaller than one,while for unbraced frame is greater than one. Feedback: 18 Effective length of column effectively held in position and restrained in direction at both ends is Choose one answer. 1. L 2. 0.67 L 3. 0.85 L Page 4
4. 1.5 L 19 Thickness of lacing flats for a single and double lacing system should not be, respectively, less than ____ of the length between the inner end bolts. Correct Feedback: Correct Incorrect Feedback: Incorrect Choose one answer. 1. (1/40, 1/50) Feedback: Incorrect 2. (1/50. 1/60) Feedback: Incorrect 3. (1/60, 1/70) Feedback: Incorrect 4. (1/40, 1/60) Feedback: Correct 20 To class the outstand element of compression flange of a rolled section and a welded section compact, b/tf ratio should be less than, Correct Feedback: Correct Incorrect Feedback: Incorrect Choose one answer. 1. (8.4Ɛ, 9.4Ɛ) Feedback: Incorrect 2. (9.4Ɛ, 8.4Ɛ) Feedback: Incorrect 3. (10.5Ɛ, 9.4Ɛ) Feedback: Correct 4. (9.4Ɛ, 10.5Ɛ) Feedback: Incorrect 21 Match List I (Types of member) with List II (Slenderness ratio) and select the correct answer. Match the answers. 1. A member carrying compressive force due to dead and live loads. 180 2. Compression flange of a beam against torsional buckling. 300 3. A member normally acting as tie, but not considered effective when subjected to possible compression due to wind or earthquake forces. 350 4. A tension member where a reversal of direct stress occurs due to wind or seismic forces. 250 22 The most economical section for a column is Correct Feedback: Correct Incorrect Feedback: Incorrect Choose one answer. 1. Rectangular Feedback: Incorrect 2. solid round Feedback: Incorrect 3. flat strip Feedback: Incorrect 4. tubular section Feedback: Correct Page 5
23 The buckling load in steel column is Choose one answer. 1. related to length 2. directly proportional to the slenderness ratio 3. inverlsy proportional to the slenderness ratio 4. non linearity of the slenderness ratio 24 Slenderness ratio of a compression member is Correct Feedback: Incorrect Feedback: Choose one answer. 1. Moment of inertia/Radius of Gyration Feedback: 2. Effective length / Area of cross-section Feedback: 3. Effective Length / Radius of gyration Feedback: 4. Radius of gyration / Area of cross-section Feedback: 25 For a column of height L fixed in position and direction both at its top and bottom, its effective length is Choose one answer. 1. L 2. 1/ROOT 2 * L 3. L/2 4. 2L 26 Battens provided for a compression member shall be designed to carry a transverse shear equal to Choose one answer. 1. 2.5 % of axial force in member 2. 5 % of axial force in member 3. 10 % of axial force in member 4. 20 % of axial force in member 27 A short column subjected to design axial load and design uniaxial moment, if eccentricity (e) is relatively small, column is likely to undergo Choose one answer. 1. tension failure 2. compression failure 3. shear failure 4. None of these 28 In laced columns, end tie plates are provided to: Choose one answer. 1. check the buckling of the column as a Whole 2. keep the column components in position 3. Check the distortion of the column sections at ends because of unbalanced horizontal force from lacings 4. Check the buckling of component column. 29 Page 6
Thickness of lacing flats for single lacing system should not be less than ________ Of the length between the inner end bolts. Choose one answer. 1. L/40 2. L/50 3. L/60 4. L/70 30 Minimum numbers of battens required in a built up column are Choose one answer. 1. 2 2. 3 3. 4 4. 6 31 The slenderness ratio of compression members is limited to account for Choose one answer. 1. The effect of accidental and construction loads 2. They may be used as a walkway in braced roof truss system 3. Vibrations 4. all the above 32 The effective length of a column with one end effectively held in position and restrained against rotation but not held in positron at the other end is Choose one answer. 1. 0.65L 2. 0.8L 3. 1.2L 4. 2L 33 The slenderness ratio of lacing flats is limited to Choose one answer. 1. 350 2. 145 3. 180 4. 250 34 Tubular sections form the most economical compression members because tubes: Choose one answer. 1. have high local buckling strength 2. have more torsional resistance 3. are subjected to less wind force than any other section 4. all the above 35 Most suitable compression member section for a roof truss is Choose one answer. 1. Single angle 2. Double angles placed back to back 3. Double angles placed as star 4. Tubes 36 Which of the following section will be preferred for a Column? Page 7
Choose one answer. 1. ISLB 2. ISMB 3. ISWB 4. ISHB 37 Which of the following is not a compression member Choose one answer. 1. Strut 2. Tie 3. Rafter 4. Boom 38 The basic difference between the determination of the cross section resistance of a Class 3 and a Class 4 sections under direct stresses is (i) For a Class 3, only an elastic stress distribution over the fully effective cross section is permitted (ii) For a Class 4 slender section, an elastic stress distribution over the reduced cross section is considered. (iii) For Class 4 slender section design strength is reduced Correct Feedback: Incorrect Feedback: Choose one answer. 1. (i) and (ii) Feedback: 2. (i) and (iii) Feedback: 3. All of them Feedback: 4. None of these Feedback: 39 For a strut with given length and end conditions, the maximum compressive load carrying for the same cross section area and same thickness is provided by Choose one answer. 1. Solid Section 2. Circular hollow section 3. Rectangle box section 4. Square box section
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