使用简易测试平台检测马哈克扭力仪的性能     

田树川  宋协法  邱天霞 《海洋湖沼通报》2002,(3):71-75

本文描述简易测试平台的原理与制作，对马哈克MAIHAK MDS－820型扭力仪检测模拟负载的准确性进行探讨。  相似文献   

Estimation of Axial Pile Bearing Capacity According to Shear Strength Parameters of Soil     

Yu Xiaodong  Yan Shuwang Sun Wanhe Postgraduate Student  Tianjin University  Tianjin Professor  Tianjin University  Tianjin Senior Engineer  Tianjin Port Engineering Institute  Tianjin 《中国海洋工程》1997,(2)

At pesent,it is very popular to estimate pile bearing capacity by use of empirical formula andphysical indexes of soil provided in the design codes for civil construction in China.This paper attempts toapply mechanical indexes of soil and semi-empirical formulas,which are based on soil mechanical theoriesand were summarized and presented by Meyerhof in 1976,to calculate the axial pile bearing capacity.Lo-ading test results of 24 single piles in Tianjin area have been collected and compared with the proposed cal-ulation approach.  相似文献   

Model Test of Sand Restraining Force on Pipeline     

Zhang Jianguo Yan Chi Yan Shuwang Lecturer  Dept. of Hydraulic Eng.  Tianjin University  Tianjin Associate Professor  Dept. of Hydraulic Eng.  Tianjin University  Tianjin Professor  Dept. of Hydraulic Eng.  Tianjin University  Tianjin 《中国海洋工程》1996,(1)

This paper describes the model tests for determining the axial friction and the lateral resistance of sand to pipeline by using fine sand and prototype pipeline, and the calculation method based on limit analysis theory is verified. The effect of cyclic loading is considered in the test.  相似文献   

关于拟共形映照Mori常数的注记     

姚增善 《中国海洋大学学报(自然科学版)》1996,(4)

讨论拟共形映照的偏差问题，加强关于拟共形映照Ｈｏｌｄｅｒ连续性的Ｍｏｒｉ偏差定理  相似文献   

三传感器波浪水槽二次反射主动吸收方法     

李炎保  张兴无 《海洋科学进展》2001,19(1):82-85

三传感器波浪水槽二次反射主动吸收方法是加拿大科学院水力中心最近开发的一种水槽反射波控制技术。该法在造波板前 1～ 2倍波长处布置 3个传感器 ,通过入反射波分离方法得到准确的入反射波参数 ,以此调整造波信号 ,有效地吸收由建筑物反射回到造波板的二次反射波。文中在分析波浪水槽二次反射吸收方法研究现状的基础上 ,介绍了加拿大水力中心对现有方法的改进及其效果  相似文献   

Fatigue Behavior of Plain Concrete Under Biaxial Compression: Experiments and Theoretical Model     

ZHU  Jin-song 《中国海洋工程》2003,17(4):617-630

The effects of different lateral confinement stress on the fatigue behavior of and cumulative damage to plain concrete are investigated experimentally. Eighty 100 mm x 100 mm x 100 mm specimens of ordinary strength concrete are tested under constant- or variable-amplitude fatigue loading and lateral confinement pressure in two orthogonal directions. A fatigue equation is developed by modifying the classical Aas-Jakobsen S-N equation for taking into account the effect of the confined stress on fatigue strength of plain concrete. The results of variable-amplitude fatigue tests indicate that the linear damage theory proposed by Palmgren and Miner is unreasonable in the biaxial stress state. A nonlinear cumulative damage model that could model the effects of the magnitude and sequence of variable-amplitude fatigue loading and lateral confinement pressure is proposed on the basis of the evolution laws of the residual strains in the longitudinal direction during fatigue tests. The residual fatigue life predic  相似文献   

Variation in Water Masses on Shelf of Northern Bering Sea in September 2016-2018     

Yingjie Wang  Na Liu  Lina Lin  Yan He  Bin Kong  Zhanhai Zhang 《Marine Geodesy》2020,43(3):285-301

Abstract

Based on hydrological data obtained during the 7th to 9th Chinese National Arctic Research Expeditions in the summers of 2016–2018, the main water structure on the shelf of the northern Bering Sea and the volume and heat fluxes of the Bering Strait throughflow were analyzed. Distinct variability was identified in the three Pacific water masses feeding the strait - Anadyr Water (AW), Bering Shelf Water (BSW) and Alaskan coastal water (ACW). Overall, the temperature and salinity of the entire section increased each year, with 2018 showing significant anomalies, i.e., a temperature anomaly of up to 1?°C and a maximum salinity anomaly of 2. From 2016 to 2018, the extent of the ACW gradually narrowed in the eastern part of this section, while the AW expanded eastward each year. The net volume transport through each of the three sections increased poleward from 1.65?Sv to 2.76?Sv, with the AW increasing from 0?Sv to 1.03?Sv, the BSW varying between 0.52–1.65?Sv, and the ACW gradually decreasing from 1.04?Sv to disappearing completely. The net heat fluxes were also poleward, varying between 25.77 TW and 61.50 TW, and showing a significant increase. Significant variations in magnitude and extent were observed in each water mass of the Bering Strait throughflow, which could produce widespread effects in the Arctic Ocean and the global ocean beyond.  相似文献   

Model Test Study of Dynamic Ice Force on Compliant Conical Structures     

黄焱  史庆增宋安 《中国海洋工程》2007,21(1):11-22

To study ice-induced vibration of a compliant conical structure,a series of model tests were performed from 2004 to 2005.In the tests,the ice sheet before the compliant conical structure was found to fail in two-time breaking.From 2005 to 2006,this type of ice failure was studied through more groups of tests.The tests show that two-time breaking is the typical failure of ice before steep conical structures,and is controlled by other factors at the same time,such as ice speed and the angle of the cone.  相似文献   

日照港30万吨油码头船舶泊稳物理模型试验研究   总被引：1，自引：0，他引：1  

王世江 《海岸工程》2006,25(4):25-30

日照港拟在岚北港区建设30万吨级原油码头,通过实验测定了船舶在风、浪、流作用下对码头结构的作用力、船舶运动量最大值、最大缆绳拉力、船舶对护舷撞击能量和撞击力,为工程结构设计和操船规程的制定提供可靠依据。  相似文献   

关于修改港工钢筋混凝土规范小偏心受压构件正截面强度计算的建议     

王清湘 《海洋工程》1995,(2)

本文提出在小偏心受压构件正截面强度计算中，取消弯曲抗压强度ｆｃｍ（Ｒｗ），采用轴心抗压强度ｆｃ，这与构件的实际破坏形态相符。对小偏心受压构件正截面强度计算提出了设计建议。特别是对工程上大量应用的矩形截面对称配筋小偏压构件提示了简捷的设计方法，与以往的近似计算方法相比具有物理概念明确，精度高，方法简捷的特点。  相似文献