Residual Static Resistance of Welded Stud Shear Connectors

Resistance of headed studs subjected to fatigue loading Part II: Analytical study

“…6. The results of the five additional tests given in [13] with exact the same specimen geometry and supporting condition and a different relative peak load show the same characteristics and are also illustrated in Fig. 6.…”

“…Thus, to include various effects from specimen geometry and material properties, the loading parameters in each test program are considered as relative values with the static strength as the reference parameter. As the effect of the static strength on the fatigue life was not considered, in most previous works except in tests of Oehlers [7], Hanswille et al [14] and Veljcovic, Johansson [13] short time static tests do not exist. In such cases the static resistance of the headed shear studs is calculated with the model given in Eurocode 4.…”

“…In EC4 and EC2 [18] the determination of the cylinder strength takes place on cylinders 150 × 300, which are stored under water at a temperature of 20 ± 2 • C. The cylinder strengths given in the literature [3][4][5]7,[11][12][13][14] were determined on specimens with different geometries and climatic conditions. To accomplish comparable test results, all material coefficients were converted according to EC4 with the Eq.…”

“…In the light of information gained from the results of pushout tests presented in the companion paper international fatigue tests on push-out specimen [2][3][4][5][6][7][8][9][10][11][12][13][14] subjected to unidirectional cyclic loading are sorted and reanalyzed to develop analytical expressions to predict the lifetime of headed shear studs in solid slabs. Further, an improved modified non-linear damage accumulation method concerning the load sequence effects and an empirical formula to predict the reduced static strength within the lifetime are presented.…”

Behaviour of Corroded Stud Shear Connectors under Fatigue Loading

“…Most of the data on connectors have been obtained from various types of push-out test. Since the 1960s, various researchers have conducted a great number of cyclic push-out tests to determine the fatigue life of shear connectors (Akao, Kurita, & Hiragi, 1982;Feldmann, Gesella, & Leffer, 2006;Feldmann, Hechler, Hegger, & Rauscher, 2008;Hanswille, Porsch, & Ustundag, 2007;Johnson, 2000;Leea, Shimb, & Changc, 2005;Nakajima et al, 2003;Oehlers, 1989;Slutter & Driscoll, 1965;Veljkovic & Johansson, 2006) Although safety factor in initial design may delay the occurrence of fatigue problems, the priori negligence of corrosion pits in structural integrity analysis may lead to significant overestimation of the damage tolerance ability of existing steel structures (Petroyiannis, Kermanidis, & Akid, 2005). There is lack of protection between the concrete slab and steel girder interface and also makes corrosion difficult to be detected.…”