A Study on Lightweight Curved Surface Structures Composed of Bending-Active Plate Units

  • 林 琮楠

Student thesis: Doctoral Thesis

Abstract

The purpose of this study is to design an innovative lightweight structural system composed of reversible curved surface plate units through active bending The original plates unit were bent and self-stabilized by inserting braces into precut parallel slits on the plates Small-scale models were used to examine stability and constructability and two structural system were developed including staggered lateral connecting system and staggered overlapping bolting system Among them the unit curvature of the staggered overlapping bolting system cannot be estimated by the empirical formula of the previous study so the small-scale model is used to re-measure and derive the applicable unit bent angle formula The material bending capacity and usage efficiency which support the selection of material are derived and calculated based on the results of material test and 3mm plywood that fiber direction paralleled with the slit was chosen as the main material Six one-way arched full-size models were built in different structural types and connection detail among which the pointed arch model of staggered overlapped bolting system has the best strength and stiffness In order to predict the stress distribution and the failure mode accurately this study uses computer structural analysis software to simulate the structural behavior The strain analysis result of bent unit which simulated by ANSYS solid-element model is closest to the measured value and the error is less than 10% The overall models of lateral connecting pointed arch were simplified by the SAP2000 2-D rigid frame model but it is unable to simulate the component buckling and the deformation error is about 70% to 95% The possible reason is that the analysis method does not consider the pre-stress and the deflection deformation of bent unit Therefore a superimposed structure analysis method combining the above two is developed to examine the stability of the overall structure
Date of Award2021
Original languageEnglish
SupervisorYi-Hsuan Tu (Supervisor)

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