| Metal arched corrugated steel roof structureis a new type of space steel structure, with less material, light weight, low cost, good seismic performance, flexible modelling beautiful, and the advantages of small environmental noise pollution,Since the last century ninety s introduced from abroad, are widely used in industrial and civil construction of the roof structure, has been widely used in our country at present. As metal arched corrugated steel roof structure more and more widely used, its engineering in overall stability, security, more and more received the concern of the industry. Due to metal arched corrugated steel roof structure performance is complex, has yet to form a unified analysis and calculation method, so the engineering accident also appear constantly.Dalian one trading center color corrugated steel sheet roof arch shell structure in November 2000 to be built and put into use. The design of the arched corrugated plate thickness of 1.5 mm, because the project completed and put into production since the use now after 15 years or so, roof long-term exposure to ultraviolet light, wind, snow and other natural factors, color corrugated steel sheet and roll edges of coating has a different degree of damage, the corresponding local apparent rust steel base material, board thickness thinning. In the process of detection using ultrasonic thickness meter testing corrugated plate steel sheet thickness delta range between 1.3 mm to 1.5 mm. Based on absorbing the steel structure of experts and scholars on metal arched corrugated steel roof structure on the basis of research achievements, a trade center in dalian color corrugated steel sheet roof arch shell structure of the field test results for the primitive data, by using large-scale finite element analysis software ANSYS to calculate the and establish the metal arched corrugated steel roof structure finite element model, the structure in five kinds of the most unfavorable load combinations are calculated respectively. This kind of structure is obtained in constant load+ half-span the snow load and constant load+wind load and half-span the snow load two kinds of working conditions in the arch foot and a quarter across the bearing capacity is insufficient, may lead to the unstability of the overall structure of the conclusion.For calculation and analysis results of this project, in combination with the practical situation of construction site, the defects in the bearing capacity is proposed in this paper under the working condition of two kinds of load combination of strengthening maintenance of the reference suggestion:1, the winter snow in choi steel arch roof arch foot to 1/4 span between snow and adversely affect the stability of roof structure as a whole. Metal arched corrugated steel roof structure in half across the most prone to the overall buckling under snow load, late in the prophase of engineering design, construction and use of the maintenance process, should try to avoid the effect of structure has long been half across the snow load, so as to ensure safe and reliable structure, prevent the happening of the accident. If the west arch feet of snow from corresponding timely handling cases, the project is not other structure corresponding reinforcement measures, but should pay attention to the usual maintenance check, such as finding defects should be timely repair.2, if the arch foot of snow in the snow weather conditions can't ensure that get timely and effective cleaning, for further on the safe side, this paper introduced a kind of pure arch shell structure roofing improved form-arched corrugated plate-truss composite system roof, introduces the arched roof of corrugated plate-truss composite system research theory, main characteristics and mechanical characteristics, as well as the feasibility of this kind of structure in practical project. |
PDF Full Text Request