Topic
Deflection (engineering)
About: Deflection (engineering) is a research topic. Over the lifetime, 30862 publications have been published within this topic receiving 298849 citations.
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TL;DR: In this article, the authors examined the small-strain behavior of Taipei clays in braced excavation through a detailed analysis of a well-documented case history, and showed that the observed wall deflection and surface settlement can be satisfactorily predicted simultaneously using the 3-SKH model.
79 citations
TL;DR: In this paper, the static and dynamic behaviors of functionally graded beams (FGB) were investigated using a hyperbolic shear deformation theory (HySDT), and various numerical results were discussed to show the influence of the variation of the volume fraction of the materials, the power index, the slenderness ratio and the effect of Winkler spring constant on the fundamental frequency, center deflection, normal and shear stress of FG-beam.
Abstract: In this investigation, study of the static and dynamic behaviors of functionally graded beams (FGB) is presented using a hyperbolic shear deformation theory (HySDT). The simply supported FG-beam is resting on the elastic foundation (Winkler-Pasternak types). The properties of the FG-beam vary according to exponential (E-FGB) and power-law (P-FGB) distributions. The governing equations are determined via Hamilton\'s principle and solved by using Navier\'s method. To show the accuracy of this model (HySDT), the current results are compared with those available in the literature. Also, various numerical results are discussed to show the influence of the variation of the volume fraction of the materials, the power index, the slenderness ratio and the effect of Winkler spring constant on the fundamental frequency, center deflection, normal and shear stress of FG-beam.
79 citations
TL;DR: In this paper, a numerical method for predicting the behavior of reinforced concrete columns subjected to axial force and biaxial bending is proposed considering curvature localization, and a series of tests was also carried out for 16 tied reinforced concrete column with 100×100 mm square and 200×100mm rectangular sections under various loading conditions.
79 citations
TL;DR: In this article, the authors presented the results of an analytical investigation of the strength and structural behavior of concrete members prestressed with external tendons and developed a nonlinear analysis model, based on the incremental deformation method, to predict the entire response of concrete member originally designed with or strengthened by external prestressing.
Abstract: The deterioration of bridges due to increased traffic loading, progressive structural aging, and reinforcement corrosion from severe weathering conditions has become a major problem around the world. External prestressing is considered one of the most powerful techniques used for strengthening or rehabilitation of existing structures and has grown to occupy a significant share of the construction market. This paper presents the results of an analytical investigation of the strength and structural behavior of concrete members prestressed with external tendons. The behavior at both the serviceability and ultimate limit states is evaluated. A nonlinear analysis model, based on the incremental deformation method, is developed to predict the entire response of concrete members originally designed with or strengthened by external prestressing. The proposed analysis reproduced experimental results of deflection and tendon stress responses with remarkable accuracy. A parametric study was undertaken to evaluate the behavior of concrete beams either designed using external prestressing or strengthened by it. The analytical results demonstrated that the second-order effect, associated with the progressive change in eccentricity of the tendons with increasing member deformation, is the main factor that distinguishes the behavior of external tendons from an internal unbonded tendon system. Because of this effect, undeviated external tendons mobilized lower nominal flexural resistance and inelastic deflections than did deviated tendons. When used for strengthening concrete flexural members, providing a moderate amount of external prestressing steel leads to significant deflection recovery, some reduction in the live load deflection, and a substantial increase in the yield load and ultimate flexural capacity of the members.
79 citations
TL;DR: Triple and step cantilevers have better deflection and frequency characteristics than rectangular ones and are used as the sensing element in microcantilever biosensors.
Abstract: This study presents the deflection, resonant frequency and stress results of rectangular, triangular, and step profile microcantilevers subject to surface stress. These cantilevers can be used as the sensing element in microcantilever biosensors. To increase the overall sensitivity of microcantilever biosensors, both the deflection and the resonant frequency of the cantilever should be increased. The effect of the cantilever profile change and the cantilever cross-section shape change is first investigated separately and then together. A finite element code ANSYS Multiphysics is used and solid finite elements cantilever models are solved. A surface stress of 0.05 N/m was applied to the top surface of the cantilevers. The cantilevers are made of silicon with elastic modulus 130 GPa and Poisson's ratio 0.28. To show the conformity of this study, the numerical results are compared against their analytical ones. Results show that triangular and step cantilevers have better deflection and frequency characteristics than rectangular ones.
79 citations