Abstract
The machine bed and the concrete foundation are connected by anchor bolts. Foundation creep is a comprehensive manifestation of foundation stability. The size and change of foundation creep affect the dynamic characteristics of the bed-foundation interface and the working state of heavy machine tools. In this paper, the contact problem between bed and foundation made of heterogeneous materials is solved, a concrete crushing hypothesis is proposed, and the basis for determining the elastic–elastoplastic–crushing critical deformation parameters of the concrete surface is formulated. Based on the Hertz contact and fractal theories, an equivalent contact model of the joint is developed, revealing the nonlinear mechanical behavior of the bolted contact surface. The cement hydration and foundation creep factors under continuous loading are taken simultaneously into consideration, and the change trend of the compressive strength and elastic modulus of the concrete at the later stage of loading is determined. By comprehensively analyzing the simulation and experimental results, the error of the theoretical model was found to be within 10%, which verifies the correctness of the proposed theoretical model. Finally, by assuming that the external load remains unchanged, a contact stiffness prediction model based on foundation creep is developed, which can provide a new basis for the contact modeling of bed-concrete foundation joint surfaces.
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The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by the National Natural Science Foundation of China (52075012) and the Beijing Science and technology project (Z201100006720008)
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The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: This work was supported by the National Natural Science Foundation of China (52075012) and the Beijing Science and technology project (Z201100006720008).
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Yongsheng, Z., Nana, N., Hongyan, C. et al. Calculation method of the contact stiffness of bed-foundation interfaces considering foundation creep. J Braz. Soc. Mech. Sci. Eng. 43, 427 (2021). https://doi.org/10.1007/s40430-021-03127-w
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DOI: https://doi.org/10.1007/s40430-021-03127-w