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A study on the deflection and crack layout in a hollow slab bridge

Wang Songtao, Wang Dawei

Archives of Civil Engineering

2023

Vol. 69, nr 3

541--555

This paper conducts research based on the hollow slab members in the reconstruction and expansion project of expressways, two types of numerical finite element models with and without considering bond-slip relationship of reinforcement and concrete are established, and verified by tests. The distribution characteristics of crack spacing in reinforced concrete beams are studied. The results show that the bond-slip characteristics of reinforced concrete have little effect on the load-deflection characteristics of 8m hollow slab beam. Due to the influence of the bond-slip relationship of reinforced concrete, the load-deflection curve is partially serrated, while without considering the bond-slip relationship of reinforced concrete, the load-deflection curve is smooth. In the numerical model without considering the bond-slip characteristics, almost all damage occurs in the longitudinal direction, and the distribution characteristics of cracks can’t be accurately determined. Regardless of whether the bond-slip is considered or not, the macroscopic characteristics of the stress distribution is: smaller near the support and larger at the mid-span. As secondary flexural cracks expand, models with and without consideration of bond-slip characteristics can’t calculate crack spacing based on the stress distribution characteristics of the reinforcement.

Thermal behavior of hollow and solid steel beamswith different boundary conditions

Daud Harbi A., Daud Sultan A., Al-Azzawi Adel A.

Computer Assisted Methods in Engineering and Science

2021

Vol. 28, no. 3

171--191

The thermal behavior of hollow steel structural members due to the temperature increasehas not been investigated and discussed in many design codes. This work presents a studyof the hollow and solid steel beams’ carrying capacity under elevated temperatures. Thematerial properties of such beams decline under the temperature expected to increasethe moments on the beams. The finite difference technique is selected first to analyze theproblem. The solved problems cover beams under concentrated point load levels with dif-ferent end conditions such as cantilever, pin roller, and both ends fixed. The beam response(deflection, bending moment, and normal force) is examined. The finite element analysiswas conducted using the DIANA FEA software to study the same problem incorporatingmaterial and geometric nonlinearities. It was found that both finite difference and finiteelement analysis solved the problem accurately when the temperature was under 500C.It was also found that when the temperature was applied to the beam bottom face thedeflection was smaller than when the temperature was applied to the side faces only andthe whole section.