Composite Structures of Steel and Concrete: Beams, Slabs, by R. P. Johnson

By R. P. Johnson

This ebook units out the fundamental ideas of composite development on the subject of beams, slabs, columns and frames, and their functions to development constructions. It offers with the issues more likely to come up within the layout of composite contributors in structures, and relates simple idea to the layout procedure of Eurocodes 2, three and 4.The new version is predicated for the 1st time at the finalised Eurocode for steel/concrete composite constructions.

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Additional resources for Composite Structures of Steel and Concrete: Beams, Slabs, Columns, and Frames for Buildings

Sample text

25, based on statistical calibration studies. 14 governs when fck exceeds about 30 N/mm2. 8fu. 15, it is assumed that the force PR is distributed over a length of connector equal to twice the shank diameter, because research has shown that the bearing stress on a shank is concentrated near the base, as sketched in Fig. 11. 145 ( fck Ecm)1/2. 3fck. This estimate ignores the enlarged diameter at the weld collar at the base of the stud, shown in Fig. 6; but it is clear that the effective compressive strength is several times the cylinder strength of the concrete.

21, where m and k are constants to be determined by testing. 32 is one of the two methods given in EN 1994-1-1. 2. The present method is similar to one that has been widely used for several decades [19], known as the ‘m–k method’. It is given in BS 5950:Part 4. 33) where fc is the measured cylinder or cube strength of the concrete. 32. A comparison of the two methods [17] has shown that this has little effect on m; but the two equations give different values for k, in different units. A value found by, for example, the method of BS 5950:Part 4 cannot be used in design to Eurocode 4; but a new value can sometimes be determined from the original test data [28].

This estimate ignores the enlarged diameter at the weld collar at the base of the stud, shown in Fig. 6; but it is clear that the effective compressive strength is several times the cylinder strength of the concrete. This very high strength is possible only because the concrete bearing on the connector is restrained laterally by the surrounding concrete, its reinforcement, and the steel flange. The results of push tests are likely to be influenced by the degree of compaction of the concrete, and even by the arrangement of particles of aggregate, in this small but critical region.

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