Deflection (engineering)

About: Deflection (engineering) is a research topic. Over the lifetime, 30862 publications have been published within this topic receiving 298849 citations.

Estimating Periods of Vibration of Tall Buildings

Abstract: A hand method of estimating the period of free vibration of building structures, for use in determining the minimum base shear for their earthquake design, is presented. The method is for structures that have uniform properties through their height, and that are symmetrical in plan and symmetrically loaded so that they do not twist. The structures may consist of rigid frames, coupled walls, wall-frames and braced frames, or any combination of these. The basis of the method is that all of the above described types of bent behave as members of a family of shear-flexure structures whose static deflections can be predicted by coupled wall theory. A method of decoupling the static deflection into a flexural component and a shear plus flexure wall-frame type of component is extended to dynamic behavior of a corresponding decoupled eigenvalue approach, to determine the periods of free vibration. The derivation of the method, an assessment of its accuracy, and a worked example to illustrate its application are presented.

Flexural Behavior of Reinforced Concrete Beams with TRC Tension Zone Cover

Abstract: This research makes a further contribution to the existing knowledge regarding textile-reinforced concrete (TRC) structural members, and the proposed component combines the advantages of TRC and reinforced concrete (RC). This concrete member was experimentally studied and its analytical formulae were derived. Test results of the flexural experiment study indicated that the beams with the TRC layer had some increases in the first crack load, the yield load, and the ultimate moment capacity, compared with the ordinary RC beams, and furthermore the ultimate moment capacity had significant increases with the increase of the reinforcement ratio of textile. A considerable reduction in the crack width and spacing was also observed for the beam with a TRC layer, and thus the postcracking stiffness of the beam was improved. Furthermore, this concrete member has satisfactory flexural ductility. For a single reinforced concrete beam with a rectangular cross section, two types of limit failure states are presented with respect to different reinforcement ratio of textile, and for each state, the relationship between the reinforcement ratio of textile and the reinforcement ratio of steel bar is derived. The calculation methods for the ultimate moment capacity for three failure modes and the midspan deflection during the entire loading process are also presented. A comparison between the calculated and the experimental results reveals a satisfactory agreement and verifies the feasibility of the formulae.