Design and Analysis of Long-Span Multi-Curved Arched Structures with Inclined Columns in Complex Mountainous Areas

In recent years, many special-shaped complex buildings have been widely used in mountain natural landscape areas, but these special-shaped complex buildings are difficult to be realized by conventional floor dropped or hanger frame structure. Therefore, a new structural scheme is proposed based on a special-shaped complex building in the complex mountain area of Chongqing, which not only meets the requirements of architectural modeling, but also solves the problem of foundation setting on the slope. The building consists of a curved facade and a inclined roof to form a complex spatial surface, and the building plan resembles a crescent shape. In order to solve the problem of vertical force transmission under such terrain conditions, and at the same time meet the requirements of building shape and large openings, the structure innovatively adopts space multi-curved arch and inclined column structural force system, in which multi-curved arch adopts inclined pile foundation, and inclined column adopts straight pile foundation. The effects of column inclination angle on the structural system were analyzed, and the results showed that increasing column inclination angle would increase the stiffness of the structure, which was beneficial to the structural force. Based on the final structural scheme, the structural deformation, structural stress and structural stability were analyzed, and stability calculations were performed for the multi-curved arch according to two methods. Multiple elements were connected with multi-curved arch to form a complex space joint, which was a key joint for load transfer. Cast steel joint was used for design, and the finite element software ABAQUS was used to analyze the stress and ultimate bearing capacity of the joint, and the results showed that the bearing capacity of the cast steel joint could meet the design requirements. Finally, the comfort of this kind of long-span special-shaped structure was analyzed in detail, and the connections between multi-curved arch or inclined column and pile foundation were introduced.