General formulas for estimating temperature-induced mid-span vertical displacement of cable-stayed bridges. (15th October 2020)

• Record Type: Journal Article
• Authors: Zhou, Yi; Sun, Limin; Fu, Zhenhui; Jiang, Zhen; Ren, Pengjie
• Is Part Of: Engineering structures. Volume 221(2020)
• Publication Date: 2020-10-15
• Subjects: Cable-stayed bridge -- Temperature -- Mid-span vertical displacement -- Formula -- Parametric analysis; Structural engineering -- Periodicals; Structural analysis (Engineering) -- Periodicals; Construction, Technique de la -- Périodiques; Génie parasismique -- Périodiques; Pression du vent -- Périodiques; Earthquake engineering; Structural engineering; Wind-pressure; Periodicals; 624.105
• DOI: 10.1016/j.engstruct.2020.111012
• Languages: English
• ISSNs: 0141-0296

Abstract

Abstract: Ambient temperature changes may cause considerable and complicated global deformation in long-span bridges. This study investigates the mechanisms of temperature-induced mid-span vertical displacement of symmetrical twin-pylon cable-stayed bridges through geometric models. General formulas are presented to separately quantify the sensitivity of the concerned displacement with respect to the cable, girder, and pylon temperature variations. The applicability of the proposed formulas is verified using numerical models of 15 bridges. The subsequent parametric analysis reveals the relationships among the temperature sensitivity, material property (linear expansion coefficients), and structural geometries (main span L 0, side-to-main span ratio γ 0, pylon height-to-span ratio ξ, and pylon height ratio λ 0 ). Furthermore, the relative impacts of the temperature changes of different structural components are compared. This study focuses on the calculation of thermal deformation of a general category of cable-stayed bridges rather than a specific one. The formulas provided show the advantages of conceptual clarity, calculation simplicity, and general applicability. They also have far-reaching implications on the design of structural health monitoring systems and the establishment of the load–response baseline models.