Application of 36m Long-Span Color Plate Arched Roof in Hangar Engineering (Part 1)

Since the arched roof structure of color plate was introduced  in the early 1990s, it has been widely used in factories, exhibition halls and warehouses. stadiums, hangars, markets and other buildings, due to its advantages of high maneuverability, fast construction speed, low cost, long service life, practical and beautiful appearance, etc. Due to the complex mechanical performance of the roof, the accurate calculation and analysis of its structural calculation model and formula are still in the research stage. Our country has not promulgated formal design specifications and construction and installation specifications.

A key project in the military, a hangar adopts a 36m long-span color plate arched roof, which is the largest span of the roof system currently used in China, and belongs to non-standard design and construction production and installation. The basic conditions of the project are length 86m, cornice elevation 5.7m, local basic snow pressure 0. 30KN/㎡, basic wind pressure 0. 45KN/㎡. In this project, a series of improvements and researches have been carried out in the design, production and installation technology of the color plate arched roof. After the inspection during the construction period and the completion acceptance, all the quality is excellent, which has accumulated practical engineering experience for the application of large-span color-plate arched roofs and the compilation of specifications in our country. Combining with this project, this paper explores the design, manufacture and installation technology of the large-span color plate arched roof.

1.Research on color plate arched roof system

a)The color plate arched roof is rolled with corrugations in the forming process, and the calculation model and stress state of these corrugated thin plates are relatively complicated. Its structural design adopts the method of probability limit state, and the design is carried out with the expression of partial coefficient. The loads acting on the structure include self-weight, wind load, snow load, dust load, suspension load, and the allowable horizontal displacement of the support should be considered. The load design value is according to “Building. The provisions of “Code for Structural Loads” are adopted, and the strength and overall stability are designed according to the basic combination of the specified load effects.

b)When designing the lower civil structure, the load is controlled by the structure’s own weight + live load + wind load, and the horizontal displacement of the supporting structure is checked and calculated according to the combination of short-term load effects.

c)The calculation of the strength and overall stability of the color-plate arched roof structure uses a simplified diagram of hinged supports.

d)In general, the main factors affecting the load-carrying capacity of a color-plate arched roof are span, rise-span ratio, and steel plate thickness. A large number of experimental studies and practice have proved that within a certain range, the larger the span, the thicker the steel plate; when the main load is wind load, the rise-span ratio should take a smaller value; when the main load is vertical load, the rise-span ratio It is better to take a larger value. Moreover, the load-carrying capacity of the color plate arched roof is mainly determined by its overall stability, and is extremely sensitive to initial defects.

2.Color plate arched roof design

a)The hangar roof adopts GY×6020 chute section arched roof (MIC. 240). The color plate is made of Shanghai Baosteel TSTE28 hot-dip galvanized color steel plate, and the material is reliable. The arch slab is designed with 7 different load combinations, generally controlled by the structure’s own weight + snow load, and considering the combination of wind load, the live load is taken as 0.30KN/㎡. 1. 5mm thick color plate is selected for the roof of the computer warehouse. and the yield strength is 335N/㎡, which meets the requirements.

b)According to the wind load and vertical load of the hangar location, the rise-span ratio can be taken as 0.25 that the roof rise is 9m.