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The Stability Study of the Roof-structure in Reversing v Beam String Structure

Author: LiDongXing
Tutor: LiYanBo
School: Tianjin University
Course: Structural Engineering
Keywords: Herringbone Beam String Elastoplastic Static stability Dynamic stability
CLC: TU399
Type: Master's thesis
Year: 2007
Downloads: 97
Quote: 1
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Abstract


Herringbone beam string is the bending stiffness member (beam) and high strength flexible member (cable) between the strut and the connection component, through the flexible member prestressed member to be interconnected with the overall stiffness of the self-balancing system. Herringbone beam string is generally used in large span space structure, but also because of its high camber, exist as ordinary steel force instability problems. Once structural instability, it will cause economic loss, and even endanger the personal safety. Therefore herringbone Beam String static stability and dynamic stability studies are necessary, has important practical significance. The main research work includes single specimens of herringbone cross beam string in full uniform load stability under the pushover analysis of the impact of various factors on the stability; herringbone and right roof beam string type were static stability and dynamic stability analysis. Firstly, the use of arc-length method of single specimens of herringbone cross beam string in full uniform loads under static analysis of the stability of the whole process of tracking reveals its force performance and failure mechanism. Secondly, the paper of different cable lengths and middle arch height ratio (h / H), different arch height and span ratio (H / L), different prestressing, different support conditions of the single-bay herringbone Static Beam String a comparative analysis of stability; draw h / H, H / L, support conditions on the structure of the static stability have a greater impact, while the cable prestress on the static stability of the structure is very small. Again, this article on a science and technology museum specimens of herringbone by 40-string consisting of roof beams and bracing for a static stability analysis. The specimens of herringbone by the support beam string together into a whole, and work together. Annular support changing the single specimens of Beam String force flow transmission performance, making it by force, deformation have undergone great changes. Then, the paper herringbone style roof beam string in three kinds of seismic waves (1940 EI Centro wave, Taft wave of 1952 and the local venues wave) under the action of the displacement time history response analysis were compared and draw EI Centro wave displacement response of the structure most unfavorable seismic waves. Finally, respectively, X, Y, Z three-way EI Centro wave beam string servant font style roof and the dynamic stability analysis. In unidirectional horizontal wave under the action of the main roof of dynamic instability is parallel to the direction of seismic wave input beam string material into the plastic, the occurrence of a larger bumps and dips, resulting in destabilization of the entire roof; vertical seismic waves in under the action of a small Zhang Xian The beams span a larger deformation, thereby losing the entire roof stability; Then, for three to EI Centro wave acting on the roof to do an analysis of the situation, in this case, instability When a large number of beam string arch ridge have entered plasticity. Smaller lower-string The beams span a large bulge and cause instability.

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