Bearing resistance

A failure analysis should also be conducted as the parent part of the joint may not be adequate to accommodate the mechanically fastened joint. It may not have the adequate thickness or the proper layup to provide the bearing resistance. As the layup cannot be changed, the only recourse is to bond additional plies. However, care must... 

The methods to calculate the end-bearing resistance (Qp) and the skin friction (QJ depend upon whether the soil is a sand or clay. The relationship for capacity (QJ of a pile minus the weight of the pile (W) is given by Equation 10.2 ... 

As noted, in introduetory soil mechanics courses the students will have performed text book problems on applying the traditional bearing capacity approaches for estimating the ultimate bearing resistance of foundations and simple linear elastic approaches for estimating footing settlement, ineluding the widely used equation ... 

Figure 3. Estimates of the ultimate bearing resistance of shallow foundations on sand.

Nominal bearing resistance = 6.0 ksf (with resistant factor of 0.5)... 

Load case Pmajt (ksi) Pmin (ksi) Nominal Bearing Resistance (ksi) Evaluate... 

Commonly used types of shallow foundations include individual footings, strip or continuous footings, combined footings, and mat or raft. Shallow foundations or spread footings derive their vertical loadsupporting capacity entirely from their base bearing resistance, whereas deep foundations derive their axial load-supporting capacity from both side and base resistances. 

Bearing resistance ( )b Theoretical method (Munfakh et al. 2001). in clay 0.50... 

In LRFD, the next step is to develop plots of the the permissible equivalent uniform contact stress (qo) perm and equivalent uniform factored nominal bearing resistance (qR) as a function of the footing effective width (B), as shown in Figures 8.6 and 8.7, respectively. Similar plots can be developed for the WSD. 

FIGURE 8.7 Schematic plots of equivalent uniform factored gross nominal bearing resistance versus footing... 

This section deals with the ultimate bearing (q jj) of shallow foundations under compression loading. The nominal bearing resistance in compression (qj in the LRFD is synonymous with in the WSD. 

Once the ultimate gross bearing capacity or the nominal bearing resistance in compression is known, the unit gross allowable bearing capacity (qj as well as the unit factored nominal resistance q can be determined as follows ... 

For simplicity, the will be used in the rest of this chapter to represent both the ultimate bearing capacity for use in WSD and the nominal bearing resistance in compression (qi ) for use in LRFD. 

TABLE 8.11 Correlation between Uniform Ultimate Bearing Capacity or Nominal Bearing Resistance in Compression... 

USAGE (1994) provides detailed guidelines for the characterization of rock as foundation support material as well as the methodologies for the evaluation of settlement and ultimate bearing capacity or nominal bearing resistance in compression of spread footings founded on rock. 

Side and end bearing resistance are related to displacement of a pile. Maximum end bearing capacity can be mobilized only after a substantial downward movement of the pile, whereas side friction reached its maximum capacity at a relatively smaller downward movement. Therefore, the components of the... 

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