Prediction of scouring around an arch-shaped bed sill using Neuro-Fuzzy model

In this study, Adaptive Neuro-Fuzzy Inference System (ANFIS) has been used to model local scouring depth and pattern scouring around concave and convex arch shaped circular bed sills. The experimental part of this research study includes seven sets of laboratory test cases which were performed in an experimental flume under different flow conditions. A data set consists of 2754 data points of scouring depth were collected to use in the ANFIS model. The ratio of arch diameter, D, to flume width, W, is used as a non dimensional variables in all test cases. The results from ANFIS model were compared with the results of ANN model obtained by Homayoon et al. [24] and previously presented models. The results indicated that for D/W equal to 1 and 1.2, the ANFIS models produced a good performance for convex and concave bed sills. As a result, the ANFIS models can be used as an alternative to ANN for estimation of scour depth and scour pattern around a concave bed sill installed with a bridge pier.     

基于“投资-效益”准则的RC桥墩全寿命总费用

基于性能的抗震设计于20世纪90年代兴起以来,目前在土木建筑方面的文献较多,但是关于桥梁的研究成果较少。采用五级钢筋混凝土桥墩结构性能水平,以钢筋混凝土桥墩墩顶位移角为量化指标,建立了钢筋混凝土桥墩性能水平与钢筋混凝土桥墩位移角限值之间一一对应的关系。将地震危险性分析与最优设防烈度结合起来,建立基于投资-效益准则的RC桥墩全寿命总造价计算的通用框架。     

新疆某水利枢纽泄洪闸闸墩温控 防裂反馈分析

Based on the basic theory of temperature field and stress field for mass concrete, a feedback calculation for the temperature control simulation is made in accordance with the specific characteristics of the pier of the flood discharge sluice for a water control project in Xinjiang. It is known through the calculation that the adoptions of both the measure to alleviate the temperature difference between the inner and the outer concrete of the pier during the early period and the measure of the following-up temperature insulation for the concrete are the favorable methods to prevent the cracking of the pier concrete, and then this study result can provide references for the related project concerned.     

隔河岩枢纽泄洪消能试验研究

本文着重介绍隔河岩枢纽泄洪消能试验研究成果。通过试验,将表孔、深孔、底孔采取平面错开,空间分层,出口采用收缩射流转向的新技术,既满足了泄洪要求,又有较好的消能防冲效果。上述研究成果为设计,施工提供了大量的数据,解决了工程中许多重大的技术难题。     

复合锚杆桩在基础加固中的应用

根据某桥墩基础承载力下降的具体情况,采用单孔复合锚杆桩技术,对桥墩基础进行了加固,并对单孔复合锚杆桩的加固机理进行了初步研究.利用数值模拟方法,对加固后桥墩基础的承载能力以及加固结构的承载性能进行了比较系统地分析.结果表明:利用单孔复合锚杆桩技术加固后的桥墩基础,其承载力有较大幅度地提高,在600kN/m的桥墩载荷作用下,加固结构和周围的岩体在垂直方向上的位移变形值不足2mm,而且基本上保持着同步变形同步稳定的理想状态,达到了设计目的.     

碗米坡预应力闸墩三维有限元分析

应用三维有限元数值分析方法对坝基、坝体、闸墩、混凝土锚块及预应力锚索在内的整体模型进行应力和变形计算。研究结果表明，预应力闸墩具有整体稳定性，在各种荷载的组合效应下整个墩体的变形和应力分布满足设计要求。     

岸坡上桩基码头设计方案的分析比较

本文结合实际工程对码头桩基和岸坡相互作用的计算表明，桩基的受力和位移与其离岸的远近、倾斜方向有密切的关系；为抵御岸坡的水平位移，在后平台增设斜顶桩对改善桩基的受力条件和减少码头位移有较为显著的作用。     

大桥高墩柱受侧向压力偏移后纠偏施工技术实例

以某大桥墩柱纠偏为例,通过现场调查确定了具体的纠偏方案,并从施工前期核实桥梁损坏情况、项升纠偏施工、纠偏过程监测等方面对施工方法进行了阐述,为类似工程施工积累了经验.     

重庆市红旗河沟立交桥墩整体式模板施工技术

本文介绍了桥墩整体式模板施工技术的模板计算方法和施工工艺。通过理论计算分析和施工控制,成功地将该项技术应用于重庆市红旗河沟立交工程,为该技术的应用提供借鉴参考。     

南水北调中线工程漕河渡槽部分墩台基础型式设计优化

漕河渡槽下部结构在招标图阶段和施工图阶段先后两次将15个槽墩由原初设的桩基承台型式改为扩大基础型式.根据最新的地质资料进行分析和论证,并通过工程量投资的比较,证明这些修改是合理的,是对原初设的优化和改进.