Shear response of trapezoidal profiled webs in girders with concrete-filled RHS flanges

Zhou²,

et al. 2023

Materials

The efficient crack eliminated stop-hole measure was proposed to repair and reduce the stress concentration associated fracture risk of the corrugated plate girders by setting it at the critical joint of flange plate with tightened bolts and gaskets under preloading. To investigate the fracture behaviour of these repaired girders, parametric finite element analysis was conducted, focusing on the mechanical feature and stress intensity factor of crack stop-hole in this paper. The numerical model was verified against experimental results first, and then the stress characteristics due to the presence of crack open-hole were analysed. It was found that the moderate-sized open-hole was more effective than the over-sized open-hole in the reduction of stress concentration. For the model with prestressed crack stop-hole through bolt preloading, the stress concentration was nearly 50% with the prestress around open-hole increased to 46 MPa, but such a reduction is inconspicuous for even higher prestress. Relatively high circumferential stress gradients and the crack open angle of oversized crack stop-holes were decreased owing to additional prestress effects from the gasket. Finally, the shift from the original tensile area around the edge of the crack open-hole that was prone to fatigue cracking to a compression-oriented area is beneficial for the reduction of stress intensity factor of the prestressed crack stop-holes. It was also demonstrated that the enlargement of crack open-hole has limited influence on the reduction of stress intensity factor and crack propagation. In contrast, higher bolt prestress was more beneficial in consistently reducing the stress intensity factor of the model with the crack open-hole, even containing long crack.

Section: Research Methods and Model Developmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Fracture Behaviour for Cracked Joints in Corrugated Plate Girders Repaired by Stop-Holes

Zhou²,

et al. 2023

Materials

“…Thus, in order to reduce the calculation difficulty, the axial rigidity of corrugated web plates was assumed to be negligible, i.e., the effective elastic modulus of corrugated webs in longitudinal direction E e = 0. The vertical compressions, transverse normal strains, and transverse bending of the concrete slabs and the corrugated steel webs were assumed to be negligible [22,23].…”

Section: Strain Energy Of Cbgcsw Considering Shear Lag and Accordion ...mentioning

confidence: 99%

Shear Lag Effect and Accordion Effect on Dynamic Characteristics of Composite Box Girder Bridge with Corrugated Steel Webs

et al. 2020

This study proposed a dynamic characteristic analytical method (ANM) of a composite box girder bridge with corrugated steel web (CBGCSW) by completely considering the impact of shear lag effect and accordion effect of corrugated steel webs. Based on energy principles and variational principles, a vibration differential equation and the natural boundary conditions of a CBGCSW were developed. The analytical calculation formula for solving the vibration differential equation was then obtained. The results calculated using the ANM agreed well with previous experimental results, which validated the correctness of ANM. To demonstrate the superiority of the ANM, the vibration frequencies of several abstract CBGCSWs with varying ratios of span–width, obtained using the elementary beam theory (EBT) and the finite element method (FEM), were compared with those obtained by ANM. The efficacy of the ANM was verified and some meaningful conclusions were drawn which are helpful to relevant engineering design, such as the observation that a higher natural vibration frequency and smaller span–width ratio significantly magnified the shear lag effect of CBGCSW. The first five-order natural vibration frequencies of the CBGCSW were significantly lower than those of the composite box girder bridge with general steel web (CBGGSW), which indicates that the impact of the accordion effect is significant.

“…Compared with traditional I-girders and I-girders with corrugated web (IG-CW), IG-CFTF-CW have good flexural performance [1,2,3], shear performance [4,5,6], local bearing performance [7], stability [1,8] and fatigue performance [9,10]. However, there are few studies on the local compressive performance of curved I-girder with concrete-filled tubular flange and corrugated web (CIG-CFTF-CW) [11].…”

Section: Introductionmentioning

confidence: 99%

Study on Local Bearing Capacity of Composite I-Girder With Concrete -Filled Tubular Flange and Corrugated Web

2022

Experimental tests on three composite straight girders and three composite curved girders are carried out to study the local bearing capacity of new composite I-girders with concrete -filled tubular flange and corrugated web (IG-CFTF-CW). The failure modes and the load carrying capacity of the new composite girders under local compressive load are studied. Experimental results show that one of the new composite straight girders failed in web buckling and the other two failed in web yielding. All the three new composite curved girders failed in elastic buckling in the web. The concrete-filled tubular flange (CFTF) can effectively increase the effective bearing length of corrugated web (CW) and the lateral stiffness and the local bearing capacity of the composite girders.