FRP复合材料在高速公路机电工程领域中的应用

介绍了以合成树脂为基体,以玻璃纤维及其制品为增强材料组成的复合材料——纤维增强材料(玻璃钢)在公路机电工程中的应用前景。     

高性能碳泡沫在纤维增强塑料船体中的应用

夹层结构是FRP/CM(纤维增强塑料)舰船的一个重要发展方向。为适应采用夹层结构高速舰船发展的需要,近年来已开发了多种轻质高性能结构芯材。但现有的结构芯材没有电磁屏蔽性,在舰船的某些特殊应用方面受到限制。本文介绍的这种高性能碳泡沫材料除了具有结构芯材已有的优点,还具有电磁屏蔽性和更高的强度。     

绳锯无损切割技术在城市地铁深基坑混凝土支撑拆除中的应用

苏州地铁塔园路站西端头井及扩大段的基坑支撑体系，采用了三道混凝土支撑，针对主体结构浇筑时第二、三道支撑的拆除，通过方案比选，制定绳锯无损切割拆除的施工方案，在实施时根据实际情况采取应对措施，顺利完成了拆除施工，效果较好，具有推广价值。     

钢丝绳在港口起重机上使用的状况评估及其延长寿命措施的探讨

介绍了钢丝绳的类型及性能,并分析了钢丝绳的主要受力情况,指出为延长港口起重机钢丝绳的使用寿命,及报废标准要进行正确评估,并提出了一些相对能延长钢丝绳使用寿命的措施。     

Characteristics of low-frequency motions of ships moored inside ports and harbors on the basis of field observations

In order to understand characteristics of low-frequency motions of ships moored inside ports and harbors, analysis on actual cargo handling logbook of stevedoring services company, including events of interruption of cargo handling, and countermeasure for ship mooring problems are investigated by field observations at two ports and numerical simulation on moored ship motions. First model port concerns with interruption of cargo handling due to the low-frequency motions. Second model port relates to a resonant effect of long-period waves or harbor oscillations, and its countermeasure by mooring system. From the investigation, it is confirmed that the low-frequency motions of ships are induced by a resonance between surge motions and long-period waves or harbor oscillations and an asymmetry in the mooring system, and affect safe ship mooring and operation efficiency of cargo handling in ports and harbors significantly.     

路堑失稳高边坡治理中的锚索动态施工及变形监测

高速公路路堑高边坡在建设期后期发生失稳后,受建设周期和地质勘察条件的限制,基于经验和工程类比的加固方案无法满足实际的要求。本文以岩溶区域某高速公路失稳高边坡为例,介绍了利用变形监测、锚索钻孔等手段获得的信息,对锚索进行动态施工并及时有效地治理了失稳边坡的实例。     

一种FRP轻便桥主梁的动力性能研究

FRP材料因其轻质高强、耐腐蚀性能好、抗疲劳性能优异,在工程中的应用前景十分广阔。研究了一种GFRP轻便桥梁主梁的动力性能,建立了主梁的有限元模型并进行了模态分析和时程分析,分析结果表明桥梁在车辆通行时不会发生共振,车速的增加使梁的跨中节点位移增大,因此应对车速加以控制。实桥动载试验验证了计算分析结果的可靠性。     

Stress concentration factors in tubular T/Y-connections reinforced with FRP under in-plane bending load

Stress concentration factors (SCFs) in steel tubular T/Y-connections strengthened with fiber reinforced polymer (FRP) are investigated. In the first step, a finite element (FE) model was developed and verified using data of several available experimental tests and empirical formulas. After that, 134 FE models of T/Y-joints with and without FRP were created and analyzed under in-plane bending (IPB) load. In the FE models, the contact between the FRP layers and the members (chord, brace, and weld) was defined. Results showed that the increase of the FRP layer number leads to the notable decrease of the SCFs. Also, the SCFs of a T/Y-joint reinforced with FRP can be down to 40% of the SCF of the corresponding unreinforced joint. Finally, FE results were used to propose two parametric formulas for determining the SCFs in the T/Y-joints strengthened with FRP subjected to IPB load. The proposed formulas were checked according to the UK Department of Energy acceptance criteria.     

对船舶推广和使用线接触结构钢丝绳的思考

船舶用钢丝绳是一种非常重要的器材,在我国船舶运输行业,钢丝绳的用途是十分广泛的。目前,船舶上线接触结构钢丝绳的使用率很低,严重影响该类器材性能和经济效益的发挥。文章分析了船舶行业钢丝绳管理、使用中存在的问题．提出了解决有关问题的基本方法和对策。     

FRP约束混凝土侧向膨胀系数模型

根据数值模拟和以往研究,深入分析FRP约束混凝土侧向膨胀系数,并基于量纲分析,提出FRP约束混凝土侧向膨胀系数模型。经验证,相比其他模型,该模型与试验结果吻合良好,具有更高的精度,能更好的用于计算侧向膨胀系数。