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The steel slit shear panel (SP), made by cutting slits in a monolithic steel plate, dissipates seismic energy through the flexural behavior of individual plate links separated by slits. To investigate the influence of different link designs and steel properties, three scaled SP specimens are designed and tested under quasi-static cyclic loading. Test results show that plate links with a larger width-thickness ratio buckle earlier and larger, and associated pinching in hysteresis is more serious. Significant strain hardening of low yield steel promotes plump shear hysteresis even with obvious out-of-plane buckling deformation. To investigate the effect of different SPs on the overall structural performance, moment resisting steel frame (MRSF) structures installed with SPs are built. Time-history analysis results show that the installation of SPs reduces the story displacement responses but increases the floor accelerations. The low yield SP works best in reducing both the maximum and residual inter-story drift. [ABSTRACT FROM AUTHOR]

Steel slit shear walls (SSSWs), made by cutting slits in steel plates, are increasingly adopted in seismic design of buildings for energy dissipation. This paper estimates the seismic energy dissipation capacity of SSSWs considering out-of-plane buckling. In the experimental study, three SSSW specimens were designed with different width-thickness ratios and aspect ratios and tested under quasi-static cyclic loading. Test results showed that the width-thickness ratio of the links dominated the occurrence of out-of-plane buckling, which produced pinching in the hysteresis and thus reduced the energy dissipation capacity. Out-of-plane buckling occurred earlier for the links with a larger width-thickness ratio, and vice versa. Refined finite element model was built for the SSSW specimens, and validated by the test results. The concept of average pinching parameter was proposed to quantify the degree of pinching in the hysteresis. Through the parametric analysis, an equation was derived to estimate the average pinching parameter of the SSSWs with different design parameters. A new method for estimating the energy dissipation of the SSSWs considering out-of-plane buckling was proposed, by which the predicted energy dissipation agreed well with the test results. [ABSTRACT FROM AUTHOR]

There are three kinds of isolators commonly used in storage tank, friction pendulum bearing (FPB), laminated rubber bearing (LRB), and variable curvature friction pendulum bearing (VCFPB), respectively. Real-time hybrid simulation is conducted in this paper to compare the seismic performance of the storage tank isolated by the above three types of bearings. The storage tank is used as the physical substructure for experimental testing, and the isolators are adopted as the numerical substructure for numerical simulation. The isolation performance is estimated by the following perspectives: deformation of the isolator, shear force, overturning moment, and input energy. Test results show that the deformation of LRB is the largest, which can be twice that of FPB, and that larger deformation will enlarge the seismic energy input into the storage tank. Moreover, the low-frequency components of shear force and overturning moment are amplified by LRB. In contrast, the FPB and VCFPB have a good performance on all frequency bands. Particularly, the softening mechanism enables VCFPB to have better seismic performance and have a reduction rate of about twice that of LRB. [ABSTRACT FROM AUTHOR]