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Abstract

The paper discusses the impact of the geometry of foundry pallet components on the value of temperature gradient on the wall crosssection

during heat treatment. The gradient is one of the most important factors determining the distribution of thermal stresses in these

items. Analysis of quantitative simulation was carried out to detect possible effect of the type of connection between pallet walls and

thickness of these walls (ribs) on the interior temperature distribution during rapid cooling. The analysis was performed for five basic

designs of wall connections used in pallets. Basing on the results obtained, the conclusions were drawn on the best connection between the

ribs in foundry pallets.

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Authors and Affiliations

A. Bajwoluk
P. Gutowski
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Abstract

The paper presents the test description and results of thermal bowing of RC beams exposed to non-uniform heating at high temperature. Bending of a non-uniformly heated element is caused by free thermal elongation of the material it is made of. The higher the temperature gradient, the greater the bending. In the case when an element is exposed to load and high temperature simultaneously, apart from free bending also deformation of the RC element may occur, which is caused by the decrease of the concrete or reinforcing steel mechanical properties. In order to examine the contribution of the deflection caused by thermal bowing to the total deformation of the bent element with a heated tension zone, an experimental study of freely heated (unloaded) beams was performed. RC beams were heated: (1) on three sides of the cross-section or (2) only on the bottom side. Deflection of elements loaded by a substitute temperature gradient was calculated using the Maxwell-Mohr formula. The test results show that deflection of freely heated RC beams (caused by the thermal bowing phenomenon) can be 10 to 20% of the total deflection of loaded RC beams with a heated tension zone.

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Authors and Affiliations

R. Kowalski
M. Głowacki
J. Wróblewska
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Abstract

The prefabricated hollow-core slab bridge is a common bridge. In prefabricated hollow-core slab bridges, joints play an important role in connecting prefabricated slabs and ensuring the integrity of the bridge. However, as the service time of the bridge increases, conventional joints have a large number of typical diseases that affect the safety and durability of bridges. In this study, a three-dimensional finite element model of the entire construction phase is established to investigate the development difference of shrinkage and creep between joints and hollow-core slabs. The effects of vehicle load and temperature gradient on joints were analysed, the failure mechanism of joints was explored, and a novel joint was proposed. The results of a nonlinear analysis showed that the novel joint can effectively improve the mechanical performance of joints and cracks can be effectively controlled. Moreover, the novel joint solves the problem in that the conventional novel joint cannot be vibrated effectively.
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Authors and Affiliations

Yujun Cui
1
ORCID: ORCID
Xingwei Xue
1
ORCID: ORCID
Hao Yao
2
ORCID: ORCID
Xudong Hua
1
ORCID: ORCID
Yuanming Huang
1
ORCID: ORCID

  1. School of Transportation and Surveying Engineering, Shenyang Jianzhu University, Shenyang, Liaoning, China
  2. Guangzhou Communications Investment Group Co., Ltd., Guangzhou, Guangdong, China

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