Study On The Static And Fatigue Performance Of Metal Roof System Under Wind Suction

This paper takes the metal roof system of domestic existing railway station building and canopy as the research object, focus on the static and fatigue performance of metal roof system under wind suction. Through establishing reasonable finite element model of the standing seam metal roof system and the traditional overlapping metal roof system, the mechanical behavior of these two metal roof under the action of wind suction is simulated, the finite element simulation analysis on their static and fatigue performance is carried out, and the results have been compared with the relevant experimental results. Through the research of this project, a scientific basis has been established for the safety control and maintenance of existing railway station and canopy metal roof system.In order to study the static and fatigue performance of metal roof system under the action of wind suction, this paper mainly carried out research in the following aspects:(1) The metal roof structure and the current situation of metal roof system have been investigated for the domestic existing railway station building and canopy, and the roof structure and damage types of the existing metal roof system have been classified and analyzed, to lay a foundation for further study on the mechanical properties of metal roof system.(2) To study the internal force transmission way of metal roof system (including roof panel, T type bearing, purlin, and girder), the simplified model of the standing seam metal roof system and the traditional overlapping metal roof system have been established respectively by using ANSYS finite element software, and their static performance and failure mode under wind suction have been analyzed, then the results have been compared with the relevant experimental results. Besides, this paper has carried out the specification verification of the metal roof system, and the results of finite element calculation have been compared with the standard calculation.(3) A random fatigue damage model has been established based on the fracture mechanics, and the fatigue problem of metal roof system under wind suction has been studied combined with the fatigue crack growth theory in this paper. Based on the fatigue cumulative damage theory, fatigue performance of the two metal roof systems under wind load has been analyzed on the foundation of static analysis by using ANSYS finite element software.(4) For the damage types of metal roofing system, the specific measures have been put forward to strengthen the wind resistance performance of the metal roofing system, from two aspects of improving the strength of the metal roof and reducing the wind pressure intensity of the metal roof. Besides, from the viewpoint of strengthening the connection between the metal roof panel and the fixed support, a kind of "simple strengthening clip" device has been designed to improve the wind resistance performance of metal roof system, whose function has been also analyzed by the finite element numerical simulation method.The innovation of this subject is mainly embodied in the following aspects:(1) Through the finite element numerical simulation method, the static performance and failure mode of the metal roof system under wind suction have been studied, and the results have been compared with the design specification; (2) The fatigue performance of the metal roof system under wind load has been simulated based on the finite element analysis; (3) A "simple strengthening clip" device for improving the wind resistant performance of metal roof system has been designed.