Test and numerical investigations on the spatial mechanics characteristics of extra-wide concrete self-anchored suspension bridge during construction

Abstract

This work is aimed at studying the mechanics characteristics of the self-anchored suspension bridge with extra-wide concrete girder during girder erection and system transformation. First, the determination and implementation processes of reasonable completion state were introduced briefly, taking the Hunan Road Bridge as the background project, which is the widest concrete self-anchored suspension bridge in China currently. Then, the ANSYS beam-type finite element model and field monitoring data were integrated to investigate the cable system evolutions during system transformation. Finally, the global refined finite element model was established using solid element to consider the shear lag effects in extra-wide girder. The measured data show that the cable displacements in tensioned domains were characterized by weak coherence and contraflexure characteristics. The longitudinal and transverse stresses of extra-wide girder distributed unevenly along transverse direction. The maximum shear lag coefficients of girder at completion state reached to 1.3. Moreover, small transverse compressive stress, or even the transverse tensile stress reaching to 1.80 MPa, appeared in the top plate segments. The measures including the arrangement optimization of transverse prestressed tendons and monitoring point redistribution were given. The research can provide references for the structural designing and safety control of the similar bridges.

Effective Properties for the Design of Basalt Particulate–Polymer Composites

“…The mesh type utilized in the FEA was SOLID187. The SOLID187 element has ten element nodes and is characterized by a secondary displacement mode and relatively high computational accuracy [27]. Moreover, the element dimension was set at 0.5 m. SOLID187 is well suited for creating meshes inside irregularly shaped structures because it supports second-order displacement [28].…”

Mechanical Performance Analysis and Parametric Study of a Self‐Anchored Suspension Bridge with Ultra‐Wide Double‐Sided Steel Box Girder

“…In addition to the structural load response of the selfanchored suspension bridge, the mechanical behaviour of the main girder is also related to the safety the bridge. When the double-sided steel box girder is used as the main girder of the self-anchored suspension bridge, its spatial mechanical performance is complex under the influence of huge force and big width [16]. Zhou et al [17] studied the stress distribution of double-sided box girder through field test, finding that under symmetrical load, the longitudinal stresses of beam top and bottom plate are M-shaped along the transverse direction, and the maximum stress increment is located at the junction of top, bottom plate, and inner web.…”