Stress-Strain Relationship of Circular Concrete Columns Confined with Lateral Pre-tensioned FRP

The active confinement for the core concrete can be provided by lateral pre-tensioned FRP, the stress hysteresis of FRP can be avoided, and good confinement effect for concrete columns can be got. It must cause large error if adopt the calculated model and constitute model of concrete columns confined with non-pretentioned FRP. The initial confined stress and effective confined stress associated with the lateral pre-stress were introduced. According to the test results and finite element simulation, the calculated model on peak stress, peak strain, ultimate stress and ultimate strain of circular concrete columns confined with lateral pre-tensioned FRP were proposed, and the initial elastic modulus of circular concrete columns confined with lateral pre-tensioned FRP was analyzed. Based the exiting stress-strain models of circular concrete columns confined with FRP, the three linear stress-strain model of circular concrete columns confined with lateral pre-tensioned FRP was recommended, and good agreement between theoretical and test results is achieved.     

胶东调水工程玻璃钢管材应用

结合胶东调水工程辛庄泵站，对出水管道管材做了比选；简要介绍了玻璃钢夹砂管道的特点及其优越性，并介绍了玻璃钢夹砂管道的结构计算情况；探讨了玻璃钢夹砂管道的波动压力、许用挠曲度、挠曲预测值、组合载荷以及屈曲的校验计算方法和计算过程。计算结果表明，辛庄泵站采用的直径1．8m的玻璃钢夹砂管道，其各项指标完全符合工程实际需要。     

玻璃钢渔船复合材料性能的试验研究

通过对FRP/1年生植物纤维复合板及FRP/混凝土复合梁弯曲强度、拉伸强度、弹性模量、剪切强度等性能的测试以及对由聚乙烯、尼龙和钢纤维混杂增强环氧树脂复合板的耐磨、耐腐蚀性能的比较试验,认为FRP/1年生植物纤维复合板可应用于玻璃钢渔船的上层建筑及船甲板;FRP/混凝土复合梁可以应用于玻璃钢渔船龙骨和肋骨;超混杂复合材料可应用于玻璃钢船体水下部分及船舷和缆桩等摩擦损失较严重的部位。     

Design and development of a portable and streamlined nutrient film technique (NFT) aquaponic system

One pilot-scale portable Nutrient Film Technique (NFT) aquaponic system has been designed, developed, and tested at ICAR-CIFA, Bhubaneswar for a period of 90 days (October to December 2018) to study the efficiency of the new design. The experimental setup has three separate units, each consisting of four major components, such as Fibreglass Reinforced Plastic (FRP) round fish culture tank (ø2.15 × 0.9 m) with operational capacity 2800 L, biofilter unit made up of Polypropylene (PP) of 100 L capacity, FRP rectangular hydroponics tank (4 × 0.9 × 0.35 m) having 2.64 m² plantation area and High-density Polyethylene (HDPE) sump (ø0.6 × 0.7 m) of 200 L capacity. Implementation of custom designed and calibrated automatic water recirculation system gives an average flow rate of 94.7 L/h for continuous flow of nutrients from fish culture tank to hydroponics tank. The designed system harnesses gravity flow in 75 % of the cycle. For performance assessment, the system was initially stocked with 54 numbers of fish fry/m³ (153.7 g/m³) of pangas (Pangasius hypophthalmus) in culture tank and 27 marigold (Tagetes erecta) plants/m² in hydroponics tank. Length and weight gain of fish were by 77.04 % and 397.2 % from initial, respectively, and marigold plant harvested 107 number of flowers/m². The Total Ammoniacal Nitrogen (TAN) reduction in biofilter was found to be 61.97 %.     

DX-180型玻璃钢扇贝拖网渔船优化改造与试验

针对日本引进的DX-180型玻璃钢扇贝拖网渔船在獐子岛海域捕捞过程中出现的高能耗、低产量等问题,通过对该渔船与獐子岛扇贝捕捞主力船型(辽长渔养15021钢质扇贝拖网渔船)的技术指标差异性分析得出,该渔船配备的捕捞网具与作业模式无法满足中国海域扇贝捕捞需求。因此,该文提出优化捕捞网具与作业模式,并通过在獐子岛虾夷扇贝(Patinopecten yessoensis)底播海域的海上对比试验论证其改造的合理性。试验分2阶段进行,第1阶段通过增大网具扫海面积并对作业参数进行优化与论证,确定在沙砾底、泥沙底和泥底的最佳拖网航速与曳纲长度;第2阶段进行海上生产对比试验,并以单位捕捞油耗、单位捕捞效率和单位捕捞成本为经济评价指标。试验结果表明,优化后的DX-180型扇贝拖网渔船的捕捞量与耗油量均得到有效改善。与预替代的辽长渔养15021钢质扇贝拖网渔船相比,虽单位捕捞油耗与钢质拖网渔船基本持平,但在单位捕捞效率和单位捕捞成本方面均优于钢质拖网渔船,其中单位捕捞效率提高了37.5%,单位捕捞成本降低了26.0%,符合扇贝低碳化产业发展需求,对中国推广玻璃钢扇贝拖网渔船从技术与经济性方面提供参考。     

SD831型90kW玻璃钢拖网渔船船体设计分析

设计并介绍了ＳＤ８３１型２４ｍ９０ｋＷ玻璃钢拖网渔船的主要技术参数、性能、装载量、主机及配套、推进装置、船舶稳性，及船体结构型式。船模试验表明，球鼻首减阻效果明显，通过实船使用，证明玻璃钢渔船具有拖力大，拖速快，节约燃油，抗碰撞能力强，渔获物产量高等优点，有重大推广价值。专家鉴定认为，属国内首创，达国内领先水平，每千瓦系桩拖力达到９０年代国际水平     

Comparision of Theoritical Solutions and Ultimate Span-Length between FRP Cables and Steel Cables

As the self weight of cable affects mechanical behavior obviously with the inerease of span length.FRP (fiber reinforced polymer) cable that has the lighter weight than the conventional cables has advantage for long span structures.The analysis of single cable is the fundamental theory for the design of cable structures.Based on different considerations of gravity loads.the solutions of the single cable on gravity loads have three sets of solutions: parabola solution.catenary solution and elastic catenary solution.And the equations for the three sets of solutions are derived by taking the end tension force of cable as the control parameter.The comparison between FRP cables and steel cables is conducted by elastic catenary solution.and the results show that the lager span structure can be realized by FRP cables.The precision for the parabola solution and catenary solution is compared for stay cables and horizontal cables.and the proper ranges of both approximate methods are proposed.Based on the above methods.the ultimate span length of FRP cable and steel cable are analyzed.It is concluded that the ultimate span of FRP cable is 4.4 times larger than that of steel cable.     

纤维复合材料加固桥梁技术研究

对纤维复合材料（FRP）加固技术的技术原理、研究现状、施工工艺及要求、技术特点及适用范围进行总结。FRP加固技术具有施工便捷、不受构件形状限制、不改变截面尺寸、对原结构不产生损伤、优异的耐久性能、不增加自重、不减小净空及具有良好的适应性等优势。给出一些纤维复合材料加固技术在桥梁加固工程中的应用实例及加固思路,FRP加固可适用于桥梁工程中的抗弯加固、抗剪加固、约束加固及耐久性加固等不同加固情况。     

基于快速性观点的玻璃钢渔船船型的优化途径

将玻璃钢渔船基于快速性分为3种类型,给出了以总阻力系数和排水体积傅汝德数为参数的快速性评判标准和船型优化途径,然后对两艘实际船型的快速性在排水体积傅汝德数为0~2.0范围内进行了对比,最后对排水型和半排水型玻璃钢渔船的研究现状和预期任务进行了简要的讨论和展望。     

商品化户用玻璃钢沼气池性能与质量控制

玻璃钢沼气池以不饱和聚酯树脂和玻璃纤维布为主复合而成,具有密闭性能好、强度高、重量轻、运输方便、安装快捷、经久耐用等特点.本文重点对沼气池的结构设计、几何尺寸、质量、厚度、制作工艺以及检测方法进行了讨论.