Bending mechanics model and value of transverse joints in precast prestressed utility tunnel

Abstract

Joints lead to the uneven distribution of structural rigidity of a precast prestressed utility tunnel (PPUT) and changes in internal forces and deformation. From research perspective, bending stiffness is important as an important indicator to evaluate the performance of PPUT joints and an important factor to evaluate the overall mechanical properties of PPUT structures. After considering the actual structural form of a transverse joint section and the characteristics of force deformation, a mechanical model that can characterize the joint section from force to failure and the corresponding analytical expressions were established using the internal force balance and deformation coordination conditions. A sensitivity analysis of the factors affecting the bending stiffness of joints was carried out using numerical simulation methods. The theoretical calculation results were compared with the numerical simulation results. Finally, according to the obtained trend of bending stiffness change, a two-stage bending stiffness method is proposed for the transverse joints of PPUT. The results of the study provide a reference for the design and theoretical analysis of PPUT.

Data Asset Management and Visualization Based on Intelligent Algorithm: Taking Power Equipment Data as An Example

“…The existing problems are summarized, including economic problems, development problems, cost problems, environmental problems, regulatory issues, etc., and the lack of successful power space safety management experience is highlighted [6]. According to Klepikov's research, human health, psychology, safety, and other factors should be considered comprehensively to improve the utilization rate of power space equipment [7]. Yoo et al developed a tunnel risk assessment system based on information technology (IT).…”

Deformation Characteristics and Damage Assessment of Prefabricated Frame Tunnels after Central and External Explosions

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“…The three-dimensional refined dynamic response models of fabricated and cast-in-situ frame tunnels were constructed by using ABAQUS software [19], and the reliability of the modeling methods was verified by full-scale explosion tests. This paper aims to explore the deformation characteristics and damage evolution law of a prefabricated frame tunnel under the load of a central explosion and external explosion (3,6,9, and 12 m away from the tunnel). The deformation and failure mode of prefabricated frame tunnels under central and external explosions were analyzed, and the deformation resistance of the prefabricated frame and cast-in-situ frame tunnels under explosion shock is discussed.…”