This paper presents the results from an experimental program and analytical assessment of influence addition fibers on mechanical properties concrete. Models derived based regression analysis 60 test data for various steel fiber-reinforced concrete have been presented. The strength studied are cube cylinder compressive strength, split tensile modulus rupture postcracking performance, elasticity, Poisson's ratio, strain corresponding to peak stress. variables considered grade concrete,...

In this paper two nonlinear model based control algorithms have been developed to monitor the magnetorheological (MR) damper voltage. The main advantage of proposed is that it possible directly voltage required structural vibration considering effect supplied and commanded dynamics damper. efficiency techniques has shown compared taking an example a base isolated three-storey building under set seismic excitations. Comparison performances with fuzzy intelligent algorithm widely used clipped...

Abstract Structural vibration control using active or passive strategy is a viable technology for enhancing structural functionality and safety against natural hazards such as strong earthquakes high wind gusts. Both the systems have their limitations. The system has limited capability to response whereas depends on external power. power requirement of civil engineering structures usually quite high. Thus, hybrid solution alleviate some In this paper multi‐objective optimal design...

Magnetorheological dampers are intrinsically nonlinear devices, which make the modeling and design of a suitable control algorithm an interesting challenging task. To evaluate potential magnetorheological (MR) in applications to take full advantages its unique features, mathematical model accurately reproduce dynamic behavior has be developed then proper strategy taken that is implementable can fully utilize their capabilities as semi-active device. The present paper focuses on both aspects....

The safety of an in-service brick arch railway bridge is assessed through field testing and finite-element analysis. Different loading test train configurations have been used in the testing. response terms displacements, strains, accelerations measured under ambient design traffic conditions. Nonlinear fracture mechanics–based analyses are performed to assess margin safety. A parametric study done effects tensile strength on progress cracking arch. Furthermore, a stability analysis collapse...

Fuzzy logic control systems have been applied as an effective system in various fields, including vibration of structures. The advantage this approach is its inherent robustness and ability to handle nonlinearities uncertainties structural behavior loading. In paper, the design a multiobjective optimal fuzzy controller (FLC) for seismically excited building structures has discussed. Acceleration velocity information used feedback FLC. Minimization peak acceleration displacement response...

The third generation benchmark control problem for seismically excited nonlinear buildings is an effort to evaluate the developed strategies in order apply them field applications. As fuzzy logic systems have been applied effectively various fields, including vibration of structures, a multiobjective optimal system has proposed this paper. Two types devices, namely, active and hybrid, driven by controller (FLC) considered present study. Nondimensionalized peak interstory drift ratio floor...

Performance of the structure includes both safety as well comfort level for user. The mainly depends on displacement response, while occupants acceleration response. In this paper, an approach multiobjective optimal design a fuzzy logic controller (FLC)-driven active tuned mass damper (ATMD) has been proposed. evaluation criteria and responses have used two objective functions optimization problem. As provides set Pareto-optimal solutions, user is allowed to select appropriate specific...

A new two-stage state feedback control design approach has been developed to monitor the voltage supplied magnetorheological (MR) dampers for semi-active vibration of benchmark highway bridge. The first stage contains a primary controller, which provides force required obtain desired closed-loop response system. In second stage, an optimal dynamic inversion (ODI) amount be each MR such that it prescribed by controller. ODI is formulated optimization with inversion, damper in set. proposed...

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