遮帘式板桩码头土压力离心模型试验研究

结合设计需要,开展多组土工离心模型试验,研究了均匀砂土地基中遮帘桩与前墙距离对前墙土压力分布的影响.试验结果发现,由于遮帘桩的存在,前墙侧向土压力分布完全不同于无遮帘桩情形下的线性分布,总体平均侧压力系数小于无遮帘桩情形下的值.根据随遮帘桩与前墙距离的变化趋势,初步探讨了最佳墙桩距离这一设计参数.     

浅析前处理材料的一些影响因素——由兴达公司前处理材料的选用2谈起

从为兴达公司选用前处理材料谈起，介绍了选用材料的实验方法，通过对实验结果的对比分析，阐述了影响磷化成膜的一些相关因素。     

巧换红旗前减振器

通常情况下,维修人员在更换红旗乘用车前减振器时,都是先把整个转向节拆下来,然后用卡簧钳钳紧减振弹簧,再拆装减振器。这样更换减振器操作起来非常麻烦,需要拆装许多的零部件。笔者在实际的维修过程中,通过不断摸索,找到了一个简单、方便的更换方法,现介绍给大家,供参考。 具体的操作是:在更换前减振器时,先     

Fatigue analysis of the bow structure of FPSO

The bow structure of FPSO moored by the single mooting system is rather complicated. There are many potential hot spots in connection parts of structures between the mooting support frame and the forecastle. Mooting forces, which are induced by wave excitation and transferred by the YOKE and the mooting support frame, may cause fatigue damage to the bow structure. Different from direct wave-induced-forces, the mooting force consists of wave frequency force (WF) and 2nd draft low frequency force (LF) , which are represented by two sets of short-term distribution respectively. Based on two sets of short-term distribution of mooting forces obtained by the model test, the fatigue damage of the bow structure of FPSO is analyzed, with emphasis on two points. One is the procedure and position selection for fatigue check, and the other is the application of new formulae for the calculation of accumulative fatigue damage caused by two sets of short-term distribution of hot spot stress range. From the results distinguished features of fatigue damage to the FPSOs bow structure can be observed.     

铁路轨道空间有限元前处理系统的研究

对于象铁路轨道这样的复杂三维结构，在进行力学分析时，数据文件的准备工作既复杂又容易出错，本文依据铁路轨道的特点，将钢轨离散为梁单元，轨枕离散为梁单元，而垫板模拟为弹簧单元，对道床和路基则采用空间超单元变换法，离散为块体单元，同时形成约束信息，荷载及材料参数均采用交互输入，依据上述算法开发了程序TPRE，得出可以直接用以空间有限元分析程序需要的数据文件。