Table of Contents
What is the condition for design strength of a tension member?
Explanation: The design strength of tension member corresponding to gross section yielding is given by Tdg = fyAg/ γm0, where fy = yield strength of material in MPa, Ag = gross cross-sectional area in mm2, γm0 = partial safety factor for failure in tension by yielding = 1.10.
What are the controlling strength limit states for tension members?
To design tension members, it is important to analyse how the member would fail under both yielding (excessive deformation) and fracture, which are considered the limit states. The limit state that produces the smallest design strength is considered the controlling limit state.
What are net areas of tension members?
The net area, A n, of a member is the sum of the products of the thickness and the net width of each element computed as follows: In computing net area for tension and shear, the width of a bolt hole shall be taken 2 mm greater than the nominal dimension of the hole.
What is slenderness ratio of a tension member?
Explanation: Slenderness ratio of tension member is ratio of its unsupported length to its least radius of gyration. This limiting slenderness ratio is required in order to prevent undesirable lateral movement or excessive vibration.
How do you calculate tension capacity of steel?
The value of tension capacity Pt is given generally by equivalent tension area x py :
- 4.6.3.1. (i) For bolted sections,
- Pt = (Ae – 0.5a2)py (ii) For welded sections,
- Pt = (Ag – 0.3a2)py where:
- 4.6.1/3.4.3. Ae is the effective net area of the angle. Ag
- 4.6.1/3.4.3. The effective net area of the section Ae is given by:
When the length of tension member is too long?
Explanation: A bar is used if the length of a tension member is too long. A rod is may be suitable for carrying an amount of tensile load except that the length of member (bar) should be short.
What are the two design limits States for tension members?
1. Yielding failure of the gross cross-section (away from a connection). 2. Fracture of the net cross-section (through the bolt holes at a connection).
How do you calculate tension members?
Example 9.3: The tension member of a roof truss consist of two unequal angles 70 x 45 x 8 with the longer legs connected by 16 mm diameter rivets. Find the safe tension for the member, the angles being one on either side of the gusset plate. Therefore safe tension for the member = 150 x 1432 = 2,14,800 N = 214.8 kN.
What are steel tension members?
Explanation: Steel tension members are those structural elements that are subjected to direct axial tensile loads, which tend to elongate the members. A member in pure tension can be stressed up to and beyond the yield limit and does not buckle locally or overall.
What is the maximum permissible slenderness ratio of steel ties?
A tie member is a member design to take tension due to DL and LL (i.e.subjected to tension due to DL and LL) but it can be in compression due to WL/EL. For this max, the slenderness ratio is 350. 250 is the correct answer.
How do you design tension members?
Design of tension members
- Design of tension members As per IS 800- 2007.
- Modes of failure Gross section yielding Net section yielding Block shear failure Design strength of member is least of:- • Strength due to yielding of gross section • Rupture of critical section • Block shear.
When a tension member consists of two channel sections the allowance for rivet hole is made for two holes from?
Question: When a tension member consists of two channel sections, the allowance for rivet hole is made for two holes from. 4 each web or one hole from each flange whichever is less.
Is code which deals with steel structure?
BIS : 456.
How do you identify a tension member?
When a member force points toward the joint it is attached to, the member is in compression. If that force points away from the joint it is attached to, the member is in tension.
What is compression member and tension member?
The two main differences between tension and compression members are: • Tension members are held straight by means of tensile loads, while in compression members, the compressive loads tend to bend the member out of the plane of loading.
What is tension member in truss?
Tension members in trusses are called ties and these are members which are being stretched. It is an industry convention that the arrows are shown pulling in on themselves. This is in contrast to the tension in a beam in which the tension forces pull outwards from the beam as shown in the bottom diagram.
When the length of a tension member is too long?
Explanation: A bar is used if the length of a tension member is too long. A rod is may be suitable for carrying an amount of tensile load except that the length of member (bar) should be short. Wire ropes are used for moderate span of truss bridges, etc.
Is TMT code steel?
IS:432- 1982: Mild steel & medium tensile steel bars and hard drawn steel wires for concrete reinforcement : Part-II -Hard drawn steel wire.
What are the load and resistance factors for the AASHTO LRFD?
The load and resistance factors corresponding to the co- ordinates of the design point are about 10% to 15% lower than those given in the current AASHTO LRFD speci˜ca- tions.1The reliability indices calculated for design accord- ing to the AASHTO LRFD speci˜cations are consistent at about the 3.5 level (Fig. 2 to 4).
What is the equivalent design formula in the AASHTO LRFD?
R= resistance (load-carrying capacity) ˜ = resistance factor = 1 (by default) Equation (2) is the equivalent design formula in the current AASHTO LRFD speci˜cations.1 1.25D+ 1.50DW+ 1.75(LL+ IM) < ˜R (2)
What is the role of the load and resistance factors?
(1) and (2) are on the load side only. The role of the load and resistance factors is to provide safety margins; that is, the load factors increase the design loads so that there is an acceptably low probability of their being exceeded.
What are the AASHTO Standard SPECI˜cations for highway bridges?
The major conceptual change with respect to the AASHTO Standard Speci˜cations for Highway Bridges2was the introduction of four types of limit states and corresponding load and resistance factors. Equation (1) is the basic design formula for structural components given in the 2002 AASHTO standard speci˜cations.2 1.3D+ 2.17(L + I) < ˜R (1) where