排序方式: 共有24条查询结果,搜索用时 218 毫秒
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The paper presents mathematical models and solution algorithms for RC pile design, through scanning soil stratums from top to downwards with an interactive scanner band. The equilibrium of transferred loads from the superstructure, friction forces and tip bearing forces are considered for the design, which leads to optimum pile length. The most important contribution of this research for designers is supplying an efficient tool to obtain optimum pile length and reinforced concrete design of pile foundation systems. A program package has been developed in MATLAB depending on the proposed algorithm. Soil behaviors depending on external effects, active and passive zone distributions are considered. All possible effects in all freedom degrees are taken into account in design process. Stress and strain distributions due to axial loads, bending moments, shear forces and torsional moments may be monitored. The optimum pile length, cross section dimension and reinforcement details may be found by using developed algorithm. 相似文献
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In this paper, we use a simple discrete dynamical model to study integer partitions and their lattice. The set of reachable configurations of the model, with the order induced by the transition rule defined on it, is the lattice of all partitions of a positive integer, equipped with a dominance ordering. We first explain how this lattice can be constructed by an algorithm in linear time with respect to its size by showing that it has a self-similar structure. Then, we define a natural extension of the model to infinity, which we compare with the Young lattice. Using a self-similar tree, we obtain an encoding of the obtained lattice which makes it possible to enumerate easily and efficiently all the partitions of a given integer. This approach also gives a recursive formula for the number of partitions of an integer, and some informations on special sets of partitions, such as length bounded partitions. 相似文献
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地震诱发的地基液化对桩基础的破坏极大,液化地基中桩的破坏机理是岩土地震工程中的一个重要研究课题。目前地基液化时桩—土—结构系统的地震性态尚没有认识充分,已有的研究内容较多局限于桩身材料的强度破坏方面,难以考虑液化土体侧向流动、基桩屈曲失稳、以及土与结构动力相互作用等复杂因素的影响。本文重点加强以下3个方面的深入探讨和研究:(1)液化地基中桩的屈曲失稳;(2)液化地基中桩基破坏的数值模拟新方法;(3)液化地基中桩-土-结构的动力相互作用分析。 相似文献
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When designing an open storage system for bulk material like coal or iron ore, operational and investment parameters are to be considered. Those inputs are always managed by engineers and prolific literature can be found. But entering into environmental parameters like wind erosion, few methodologies are available, US EPA being one of the most extensive. This source is focused on certain conditions of wind direction, pile shape, etc. what sometimes are not matching the most interesting way of storing the material: area restrictions, stacking means, etc. Based on state of the art computational fluid dynamics (CFD) software, in this case we have used ANSYS CFX 5.7., modelling system was developed and compared to EPA results for conical and oval with flattop piles. After adjusting the calculation process and selecting the most effective variables, the semicircular shape was studied finding that for the same amount of material stored, lower emissions and wind erosions are to be expected; however depending on wind direction higher values of friction per surface unit are found but due to its higher volume of storage per square metre, the balance is positive to the semicircular pile. 相似文献
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S. Küçükarslan 《Archive of Applied Mechanics (Ingenieur Archiv)》2008,78(1):21-31
In this paper, the transient analysis of a single pile and a 3 × 3 pile group is presented for Gibson type non-homogeneous
soil by using a hybrid type of boundary and finite element formulation for the soil domain and pile domain, respectively.
The formula is presented for a transient point force acting in the interior of a non-homogeneous, isotropic half space. A
time stepping boundary element algorithm for soil domain is used together with an implicit time integration scheme for finite
pile domain. To investigate the validity of this formulation, a single pile and a pile group are analyzed under Heaviside
loading and triangular transient loading. In the analyses, it can be concluded that the results agree well for all cases of
the inhomogeneity index by comparing the Laplace domain solutions. 相似文献
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