The Experts below are selected from a list of 51 Experts worldwide ranked by ideXlab platform
Su Xiao-ying - One of the best experts on this subject based on the ideXlab platform.
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The winter construction and management of deep foundation and Anchor rod
2003Co-Authors: Su Xiao-yingAbstract:In this paper the"drilling mud-jack method","steel Pipe Anchor rod","expensive heat storage method"and other technical measures in winter construction of deep foundation and Anchor rod in Haerbin central trade city are discussed, those measures overcome some difficulties of winter construction of deep foundation and Anchor rod, which short the limit time as one winter and acquire good social and economical benefits.
William Ranson - One of the best experts on this subject based on the ideXlab platform.
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Pipe Anchor discontinuity analysis utilizing power series solutions bessel functions and fourier series
Nuclear Engineering and Design, 2003Co-Authors: Dennis K Williams, William RansonAbstract:Abstract One of the paradigmatic classes of problems that frequently arise in piping stress analysis discipline is the effect of local stresses created by supports and restraints attachments. Over the past 20 years, concerns have been identified by both regulatory agencies in the nuclear power industry and others in the process and chemicals industries concerning the effect of various stiff clamping arrangements on the expected life of the Pipe and its various piping components. In many of the commonly utilized geometries and arrangements of Pipe clamps, the elasticity problem becomes the axisymmetric stress and deformation determination in a hollow cylinder (Pipe) subjected to the appropriate boundary conditions and respective loads per se. One of the geometries that serve as a Pipe Anchor is comprised of two Pipe clamps that are bolted tightly to the Pipe and affixed to a modified shoe-type arrangement. The shoe is employed for the purpose of providing an immovable base that can be easily attached either by bolting or welding to a structural steel Pipe rack. Over the past 50 years, the computational tools available to the piping analyst have changed dramatically and thereby have caused the implementation of solutions to the basic problems of elasticity to change likewise. The need to obtain closed form elasticity solutions, however, has always been a driving force in engineering. The employment of symbolic calculus that is currently available through numerous software packages makes closed form solutions very economical. This paper briefly traces the solutions over the past 50 years to a variety of axisymmetric stress problems involving hollow circular cylinders employing a Fourier series representation. In the present example, a properly chosen Fourier series represent the mathematical simulation of the imposed axial displacements on the outside diametrical surface. A general solution technique is introduced for the axisymmetric discontinuity stresses resulting from an Anchor restraint on a selected of Pipe geometry. These solutions can be economically implemented on today's symbolic calculus software packages with no loss in solution accuracy when compared to often more expensive techniques such as the finite element method. Verification of the axisymmetric solution technique is illustrated by the comparison of results for the closed form solutions versus those approximated by the finite element technique. Extensions of the general axisymmetric solution technique to other geometries and applied loads are also discussed while the numerical and graphical results are tendered.
Milad Bazli - One of the best experts on this subject based on the ideXlab platform.
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Development of fragility functions for natural gas transmission Pipelines at Anchor block interface
Engineering Structures, 2019Co-Authors: Hamed Ashrafi, Akbar Vasseghi, Mahmood Hosseini, Milad BazliAbstract:Abstract In this paper, fragility functions are developed for natural gas transmission Pipelines at Anchor block interface under the effect of seismic wave propagation. The fragility functions are developed for three typical Pipelines in two types of soils. Seismic response of the Pipeline at Anchor block interface is evaluated by conducting non-linear dynamic response analysis of the Pipeline system. The Pipeline system consisting of the Pipe, the Anchor block, and the surrounding soil is subjected to ground shakings associated with a set of 36 earthquake records to develop the fragility function. The results of analyses indicate that the critical Pipeline section is at Pipe-Anchor block interface where the Pipe is susceptible to local buckling failure. The fragility functions are developed using strain limit state associated with local buckling of the Pipe. The results of this study indicate that the vulnerability of Pipelines to the local buckling failure at Pipe-Anchor block interface increases with increasing Pipe diameter. Also because of the relatively large Anchor blocks in soft soils, Pipelines are more vulnerable to the local buckling failure in soft soils than in hard soils.
He Yulong - One of the best experts on this subject based on the ideXlab platform.
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INFLUENCE OF PRE-REINFORCEMENT MEASURES ON EXCAVATION STABILITY OF TUNNELLING
Chinese journal of rock mechanics and engineering, 2009Co-Authors: He YulongAbstract:Taking the surrounding rock of land section of Xiamen Subsea Tunnel as engineering background,the influence of pre-reinforcement on stability of tunnel from three aspects including failure load of surrounding rocks,displacements of surrounding rocks and safety of primary support is analyzed through model test,in which the effects of grouting,small Pipe,Anchor and their combination on failure mode of un-supported section and tunnel face are studied. It is shown that single measure is less efficient than the combinatorial one,and the adaptability of single measure should be considered;for single measure to control destructiveness,grouting is more efficient than small Pipe and Anchor;Anchor has less effect on ground displacement,but it is more efficient to control displacement of tunnel face than small Pipe. The variation of axial force and safety factor in the primary support stage is related to the effect of pre-reinforcement;and the location of the biggest bending moment is related to the failure mode of tunnel.
Jong-ho Shin - One of the best experts on this subject based on the ideXlab platform.
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Performance evaluation of pin-holed Pipe Anchor for fractured zone in subsea tunnel
Marine Georesources & Geotechnology, 2016Co-Authors: Jong-ho ShinAbstract:ABSTRACTThe presence of a fractured zone at a tunnel face can threaten the stability of the tunnel by causing water leakage and degradation of the soil strength. In this case, to stabilize the tunnel face, the pore water pressure is generally reduced and the loss of soil particles is prevented by installing drainPipes. The installation of drainPipes, however, can cause the concentration of flow channels and other ground instability problems. In this paper, a novel pin-holed Pipe Anchor is proposed to overcome the problems occurring in subsea tunnels. The pin-holed Pipe Anchor is a Pipe-type support member designed to reinforce the ground while simultaneously enabling flow into the tunnel. Here, the design requirements of the pin-holed Pipe Anchor were examined through material tests, and the structural–hydraulic characteristics of the pin-holed Pipe Anchor were investigated through a model test. Furthermore, the applicability of the pin-holed Pipe Anchor to an actual tunnel was evaluated by numerical anal...