000018850 001__ 18850
000018850 005__ 20170118182244.0
000018850 04107 $$aeng
000018850 046__ $$k2017-01-09
000018850 100__ $$aKolay, Chinmoy
000018850 24500 $$aReal-Time Hybrid Simulation of a Reinforced Concrete Structure Using Flexibility-Based Fiber Elements and Advanced Integration Algorithms

000018850 24630 $$n16.$$pProceedings of the 16th World Conference on Earthquake Engineering
000018850 260__ $$b
000018850 506__ $$arestricted
000018850 520__ $$2eng$$aAn accurate and efficient state determination of the analytical substructure plays an important role in real-time hybrid simulation (RTHS) of a structure subjected to seismic excitations. This becomes even more important for RTHS of reinforced concrete (RC) structures because the hysteretic behavior of RC members is complex and generally involve pinching, softening, and strength degradation in their force-deformation response. Such complex hysteretic behavior is better modeled using the force-based fiber element formulation compared with the stiffness-based approach. The main advantage of the force-based formulation, which stems from the enforcement of equilibrium along the element in a strict sense, is that the material nonlinearity can be modeled using a single element per structural member. This results in a significant reduction of the number of a model’s degrees of freedom. However, the implementation of a force-based fiber element formulation in a standard stiffness-based finite element program requires an iterative state determination procedure to satisfy compatibility within a specified tolerance. This iterative procedure is not feasible for RTHS because convergence cannot be guaranteed in real time. This issue is addressed by implementing a force-based fiber element formulation with a fixed number of iterations for application to RTHS using an explicit direct integration algorithm. When the maximum number of iterations is reached, element end forces are corrected to re-establish compatibility and the unbalanced section forces are carried over to and corrected in the next integration time step. Using this implementation scheme and the modified KR-α (MKR-α) method, a recently developed family of unconditionally stable explicit parametrically dissipative direct integration algorithms, RTHS of a two-story RC special moment resisting frame (SMRF) building with a nonlinear viscous damper are performed under the maximum considered earthquake hazard level. The RC SMRF is modeled analytically using the force-based fiber element and the nonlinear viscous damper is modeled physically in the laboratory. The efficacy of the proposed iterative scheme is assessed based on RTHS results which show that an accurate solution can be obtained even when no iteration is performed at the element level.

000018850 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000018850 653__ $$areal-time hybrid simulation; force-based element; explicit dissipative algorithms; unconditional stability

000018850 7112_ $$a16th World Conference on Earthquake Engineering$$cSantiago (CL)$$d2017-01-09 / 2017-01-13$$gWCEE16
000018850 720__ $$aKolay, Chinmoy$$iRicles, James
000018850 8560_ $$ffischerc@itam.cas.cz
000018850 8564_ $$s523005$$uhttps://invenio.itam.cas.cz/record/18850/files/2347.pdf$$yOriginal version of the author's contribution as presented on USB, paper 2347.
000018850 962__ $$r16048
000018850 980__ $$aPAPER