Papers by Keyword: Temperature Stress

Abstract: This study investigates the dual benefits of Phase Change Material (PCM) incorporation in concrete for pavement construction, focusing on both performance enhancement and energy efficiency. Through extensive mechanical testing and thermal analysis, the effects of PCM content on concrete strength and temperature stress mitigation were evaluated. Results indicate that while PCM addition led to reductions in compressive and flexural strengths, mixes containing 8% PCM maintained feasible strengths for pavement applications. Furthermore, thermal analysis demonstrated significant reductions in temperature and curling stresses with increasing PCM content, highlighting the potential for enhanced pavement durability and energy efficiency. Multi-criteria decision-making (MCDM) analysis identified the 8% PCM mix as the optimal choice due to its balanced performance across critical parameters. This research underscores the efficacy of PCM-enhanced concrete in improving pavement performance and energy efficiency, emphasizing the importance of careful PCM content selection in achieving sustainable pavement solutions.

Abstract: In the constructions of multilayer cylindrical shells in heat-and-power engineering the materials, exhibiting rheological properties, such as concrete, polymers or fiber glass are widely used. In this connection, the study of temperature stresses in polymers, the analysis of the influence of various factors on the processes course under consideration, is of great importance. The paper presents an analytical solution of the thermal creep problem in polymers using the Kelvin-Voigt model for a rigidly clamped rod for various cases of temperature loading. The analysis of these solutions is also made on the example of a specific material for certain laws with changing temperature loads.

Abstract: This paperstudied the development of stress and strain influences by different constraintdegree based on the concrete thermal stress tests. furthermore, suggested thevalue range of the constraint degree in the thermal stress test.

Abstract: Basing on the finite element analysis software, the emergence of crack under the effect of gradual changed temperature load and the change of stress which are in the condition of super reinforced concrete frame structure are analyzed from the linear and nonlinear numeral simulation. The simulation shows that the structure component under the normal condition is cracked and turn into the nonlinear condition and the steel bars still works under the elastic stage. Meanwhile the actual stage which is reflected by the elastic-plastic analysis of the internal force and deformation is compared by the results which are obtained by the actual project observed results and the calculation of the simplified model. So the distribution of the stress which is caused by the structure temperature reduction is greatly evaluated by the usage of the cracking model which is nonlinear finite element and also plays an important role in the engineering project and practice.

Abstract: This paper deducing the analytical solution of temperature stress of reinforced concrete beams strengthened under the principle of compatibility of deformation. And we also analyze the influencing factors, such as elasticity modulus, thickness, coefficient of thermal expansion, the height of test beam, concrete mark and so on. The research shows that the elasticity modulus and thickness of the carbon fiber are the major influencing factors of temperature stress, the coefficient of thermal expansion and the height of test beam are the second influencing factors, and the influence of concrete mark is very tiny.

Abstract: Raft foundation was researched in this paper,basing on the traditional “Wang Tiemeng Method”,the influence of temperature stress calculation by radiation condition was put forward emphatically. According to analysis the two calculation results, obtains the more precise temperature stress calculational method. Consequently the of concrete crack calculation and analysis result can be more precise and reliable.

Abstract: In this paper, the temperature stress of singer piece was calculated by FEM and the stress reaction of PP fiber and steel fiber was analyzed. It is knew that the fiber with lower elastic modulus and lagerer spacing can provide weaker constraints and the restriction stress of fiber concrete is smaller. The calculation result of fiber reason space between is consistent with the common value in engineering.

Abstract: The main structure of Changge stadium is super-long irregular rectangular plane structure. Under the effect of temperature changing, the internal force and deformation of the structure is complicated. The distribution discipline of temperature effect is concluded through PMSAP software. In the design, some reliable measures with the discipline of ‘resistance’ and ‘release’ are taken to ease the negative impact of the temperature effect.

Abstract: The construction of high-rise building transfer story concrete girder belongs to the mass concrete, due to the concrete hydration heat temperature is often beyond the limited temperature, so need to make temperature calculation and temperature control of transfer story concrete girder in the construction process. This paper taking a steel reinforced concrete girder of a high-rise building transfer story as an example, using finite difference method to calculate the change rule of concrete temperature field along with age, then using nonlinear analysis program ANSYS simulation the mechanical performance of transfer beam under the action of loads and temperature stress during the construction. Analysis and calculation results should provide technical support for the construction of the steel reinforced concrete girder of the transfer story. Analysis shows that, at intervals of 12 days two laminated pouring of concrete in the construction process, will meet the requirements of temperature control.

Abstract: In a high-rise building located in Nanchong of Sichuan Province, after the removal of template of the crossbeam of the concrete transfer storey in the basement, there are many vertical and diagonal cracks which can be detected directly by human eyes. According to the structure design data and structural working drawing of this project, multiple detection methods are adopted for the detection on and analysis to the factors caused the cracks. From that, the thesis proposes some feasible handling suggestion as the reference for the similar engineering in future.