Question 1 |

A steel member 'M' has reversal of stress due to live loads, whereas another member 'N' has reversal of stress due to wind load. As per IS 800:2007, the maximum slenderness ratio permitted is:

less for member 'M' than that of member 'N' | |

more for member 'M' than for member 'N' | |

same for both the members | |

not specified in the Code |

Question 1 Explanation:

As per IS 800:2007

Question 2 |

A steel flat of rectangular section of size 70\times 6 mm is connected to a gusset plate
by three bolt each having a shear capacity of 15 kN in holes having diameter 11.5
mm. If the allowable tensile stress in the flat is 150 MPa, the maximum tension
that can be applied to the flat is

42.3kN | |

52.65kN | |

59.5kN | |

63kN |

Question 2 Explanation:

Along (1)-(1)

\begin{aligned} A_{net}&=\left ( 70-11.5 \right )\times 6 \\ &=351\, mm^{2} \\ P&=\left ( A_{net} \right )\times \left ( f_{y} \right ) \\ &=351\times 150 =52.65\, kN \end{aligned}

Along (2)-(2)

\begin{aligned} A_{net}&=\left ( 70-2\times 11.5 \right )\times 6 \\ &=282\, mm^{2} \\ P&=\left ( A_{net} \right )\times f_{y} \\ &=282\times 150 N=42.3 kN\end{aligned}

Question 3 |

In the design of welded tension members, consider the following statements :

I. The entire cross-sectional are of the connected leg is assumed to contribute to the effective area in case of angles.

II. Two angles back-to-back and tack-welded as per the codal requirements may be assumed to behave as a tee section.

III. A check on slenderness ratio may be necessary in some cases.

The TRUE statements are

I. The entire cross-sectional are of the connected leg is assumed to contribute to the effective area in case of angles.

II. Two angles back-to-back and tack-welded as per the codal requirements may be assumed to behave as a tee section.

III. A check on slenderness ratio may be necessary in some cases.

The TRUE statements are

Only I and II | |

Only II and III | |

Only I and III | |

I, II and III |

Question 4 |

The permissible stress in axial tension \sigma _{st}
in steel member on the net effective
area of the section shall not exceed the following value (f_{y} is the yield stress)

0.80 f_{y} | |

0.75 f_{y} | |

0.60 f_{y} | |

0.50 f_{y} |

Question 5 |

Two equal angles ISA 100mm\times 100mm
of thickness 10 mm are placed back to back and connected to the either side of a gusset plate through a single row of 16 mm diameter rivets in double shear. The effective areas of the connected and unconnected legs of each of these angles are 775 mm^{2} and 950 mm^{2}, respectively. If the angles are NOT tack riveted, the net effective area of this pair of angles is

3650mm^{2} | |

3450mm^{2} | |

3076mm^{2} | |

2899mm^{2} |

Question 5 Explanation:

When angles are not tack riveted, they will be considered as single angles connected on one side of gusset plate,

\begin{aligned} A_{e}&=\left ( A_{1}+kA_{2} \right )\times 2 \\ k&=\frac{3A_{2}}{3A_{1}+A_{2}} \\ &=\frac{3\times 775}{3\times 775+950} \\ &=0.71 \\ A_{e}&=\left ( 775+0.71\times 950 \right )\times 2 \\ &=2899\, mm^{2}\end{aligned}

\begin{aligned} A_{e}&=\left ( A_{1}+kA_{2} \right )\times 2 \\ k&=\frac{3A_{2}}{3A_{1}+A_{2}} \\ &=\frac{3\times 775}{3\times 775+950} \\ &=0.71 \\ A_{e}&=\left ( 775+0.71\times 950 \right )\times 2 \\ &=2899\, mm^{2}\end{aligned}

There are 5 questions to complete.