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14 R E L A S T ® D E S I G N M A N U A L Finally figure 14 shows the behavior of the specimens under dynamic loading Tests with concrete screws in nonbonded installation were loaded with 1 25 million load cycles between 70 kN and 140 kN after precracking No failure was identified during dynamic loading and so the specimens were then loaded to failure by static loading Dynamically loaded specimens achieved a 20% higher failure load than statically loaded specimens with equal configurations Beam deflection for both specimens under dynamic and static loading achieved a permanent deformation of about 2 mm and it was therefore concluded that dynamically loaded specimens had a significantly higher stiffness when loaded again with static loads The same was done for bonded screws however with 5 million load cycles Similarly no failure was identified during cyclic loading and permanent beam deflection was smaller in comparison to the first test series even though the number of load cycles were 4 times higher [1] Figure 14 dynamically loaded tests compared to the static loaded comparison test and the unreinforced reference tests for RELAST ® 22 screws in nonbonded and bonded installation and RELAST ® 16 screws in bonded installation [1] unbonded bonded RELAST ® -22 static RELAST ® -22 cyclic reference RELAST ® -16 static RELAST ® -16 cyclic reference RELAST ® -22 static RELAST ® -22 cyclic 3 VALIDATION BY TESTING