随着智能电网的快速发展,高效可靠的通信系统成为其核心支撑。重点研究基于光纤通信的智能电网通信系统设计,从物理层、数据链路层到网络层进行全面架构设计。采用单模光纤、密集波分复用技术、改进以太网协议以及网际互连协议第六版(In...随着智能电网的快速发展,高效可靠的通信系统成为其核心支撑。重点研究基于光纤通信的智能电网通信系统设计,从物理层、数据链路层到网络层进行全面架构设计。采用单模光纤、密集波分复用技术、改进以太网协议以及网际互连协议第六版(Internet Protocol version 6,IPv6)等技术,构建高性能、高可靠性的通信系统。通过实验证实,设计系统具备优异性能,具有高吞吐量、低延迟、极低丢包率。研究结果为智能电网通信系统的发展提供一定的参考,有助于推动电力系统的智能化发展。展开更多
The effectiveness of carbon fiber reinforced polymer（CFRP） grids as the strengthening materials for a pre-damaged scaled tunnel model is experimentally investigated. First, the bond performances between the CFRP gri...The effectiveness of carbon fiber reinforced polymer（CFRP） grids as the strengthening materials for a pre-damaged scaled tunnel model is experimentally investigated. First, the bond performances between the CFRP grid and the concrete under different types of adhesive and surface treatment were tested. The most efficient anchoring system was adopted for the subsequent scaled tunnel strengthening. Test results show that when the epoxy structural adhesive was used as the bonding material, the failure mode was CFRP grids rupturing,and the anchorage performance was optimal. When the polymer mortar was used as the adhesive, the surface treatments with anchored bolts and grooves can improve the bond performance, and the failure mode was sliding failure with the polymer mortar peeled off. After strengthening with CFRP grids, both the stiffness and the load capacity of the pre-damaged scaled tunnel model were improved. Additionally,the results obtained by fiber bragg grating（FBG） sensors indicate that the strains across tunnel segments were reduced,and the overall performance of the tunnel was improved.展开更多
在混凝土植入钢纤维网格,结合结构受力特点对钢纤维网格铺设方向进行调整,通过ANSYS软件,对钢纤维增强高性能混凝土力学性能的数值模拟进行了研究,结果表明,在载荷作用下,钢纤维网格轴向应力分布图中,大部分区域所受轴向应力是压应力,...在混凝土植入钢纤维网格,结合结构受力特点对钢纤维网格铺设方向进行调整,通过ANSYS软件,对钢纤维增强高性能混凝土力学性能的数值模拟进行了研究,结果表明,在载荷作用下,钢纤维网格轴向应力分布图中,大部分区域所受轴向应力是压应力,在构件的底部中间区域集中有拉应力,拉应力从中间部位向两端逐渐降低。在10.5 k N集中载荷作用下,试件钢纤维加入后,试件各节点位置轴向应力得到有效降低。加入钢纤维可使混凝土试件最大节点轴向应力、底部平均节点轴向应力均降低显著。钢纤维对混凝土构件挠度方向抗变形能力具有显著提高,截面尺寸相同的条件下,钢纤维增强混凝土相较于钢筋混凝土具有更有优良的抗变形能力,能够有效改善混凝土构件的局部抗拉性能。在10.5 k N载荷作用下,90°钢纤维网格混凝各节点在Y轴方向具有最大变形;35°钢纤维网格混凝各节点具有最新变形;65°钢纤维混凝土变形比50°钢纤维网格混凝土微高。展开更多
Uplift response of symmetrical anchor plates with and without grid fixed reinforced （GFR） reinforcement was evaluated in model tests and numerical simulations by Plaxis. Many variations of reinforcement layers were ...Uplift response of symmetrical anchor plates with and without grid fixed reinforced （GFR） reinforcement was evaluated in model tests and numerical simulations by Plaxis. Many variations of reinforcement layers were used to reinforce the sandy soil over symmetrical anchor plates. In the current research, different factors such as relative density of sand, embedment ratios, and various GFR parameters including size, number of layers, and the proximity of the layer to the symmetrical anchor plate were investigated in a scale model. The failure mechanism and the associated rupture surface were observed and evaluated. GFR, a tied up system made of fiber reinforcement polymer （FRP） strips and end balls, was connected to the geosynthetic material and anchored into the soil. Test results showed that using GFR reinforcement significantly improved the uplift capacity of anchor plates. It was found that the inclusion of one layer of GFR, which rested directly on the top of the anchor plate, was more effective in enhancing the anchor capacity itself than other methods. It was found that by including GFR the uplift response was improved by 29%. Multi layers of GFR proved more effective in enhancing the uplift capacity than a single GFR reinforcement. This is due to the additional anchorage provided by the GFR at each level of reinforcement. In general, the results show that the uplift capacity of symmetrical anchor plates in loose and dense sand can be significantly increased by the inclusion of GFR. It was also observed that the inclusion of GFR reduced the requirement for a large L/D ratio to achieve the required uplift capacity. The laboratory and numerical analysis results are found to be in agreement in terms of breakout factor and failure mechanism pattern.展开更多
文摘随着智能电网的快速发展,高效可靠的通信系统成为其核心支撑。重点研究基于光纤通信的智能电网通信系统设计,从物理层、数据链路层到网络层进行全面架构设计。采用单模光纤、密集波分复用技术、改进以太网协议以及网际互连协议第六版(Internet Protocol version 6,IPv6)等技术,构建高性能、高可靠性的通信系统。通过实验证实,设计系统具备优异性能,具有高吞吐量、低延迟、极低丢包率。研究结果为智能电网通信系统的发展提供一定的参考,有助于推动电力系统的智能化发展。
基金The Science and Technology Project of China Southern Pow er Grid Co.,Ltd.(No.GDKJ00000030)the National Key Technology R&D Program of China(No.2016YFC0701400)the National Natural Science Foundation of China(No.51525801)
文摘The effectiveness of carbon fiber reinforced polymer（CFRP） grids as the strengthening materials for a pre-damaged scaled tunnel model is experimentally investigated. First, the bond performances between the CFRP grid and the concrete under different types of adhesive and surface treatment were tested. The most efficient anchoring system was adopted for the subsequent scaled tunnel strengthening. Test results show that when the epoxy structural adhesive was used as the bonding material, the failure mode was CFRP grids rupturing,and the anchorage performance was optimal. When the polymer mortar was used as the adhesive, the surface treatments with anchored bolts and grooves can improve the bond performance, and the failure mode was sliding failure with the polymer mortar peeled off. After strengthening with CFRP grids, both the stiffness and the load capacity of the pre-damaged scaled tunnel model were improved. Additionally,the results obtained by fiber bragg grating（FBG） sensors indicate that the strains across tunnel segments were reduced,and the overall performance of the tunnel was improved.
文摘在混凝土植入钢纤维网格,结合结构受力特点对钢纤维网格铺设方向进行调整,通过ANSYS软件,对钢纤维增强高性能混凝土力学性能的数值模拟进行了研究,结果表明,在载荷作用下,钢纤维网格轴向应力分布图中,大部分区域所受轴向应力是压应力,在构件的底部中间区域集中有拉应力,拉应力从中间部位向两端逐渐降低。在10.5 k N集中载荷作用下,试件钢纤维加入后,试件各节点位置轴向应力得到有效降低。加入钢纤维可使混凝土试件最大节点轴向应力、底部平均节点轴向应力均降低显著。钢纤维对混凝土构件挠度方向抗变形能力具有显著提高,截面尺寸相同的条件下,钢纤维增强混凝土相较于钢筋混凝土具有更有优良的抗变形能力,能够有效改善混凝土构件的局部抗拉性能。在10.5 k N载荷作用下,90°钢纤维网格混凝各节点在Y轴方向具有最大变形;35°钢纤维网格混凝各节点具有最新变形;65°钢纤维混凝土变形比50°钢纤维网格混凝土微高。
基金supported by the research Grant at UTM,Malaysia(GUP Grant)the project name is"uplift response of symmetrical anchor plates in grid fixed reinforced in cohesionless soil"
文摘Uplift response of symmetrical anchor plates with and without grid fixed reinforced （GFR） reinforcement was evaluated in model tests and numerical simulations by Plaxis. Many variations of reinforcement layers were used to reinforce the sandy soil over symmetrical anchor plates. In the current research, different factors such as relative density of sand, embedment ratios, and various GFR parameters including size, number of layers, and the proximity of the layer to the symmetrical anchor plate were investigated in a scale model. The failure mechanism and the associated rupture surface were observed and evaluated. GFR, a tied up system made of fiber reinforcement polymer （FRP） strips and end balls, was connected to the geosynthetic material and anchored into the soil. Test results showed that using GFR reinforcement significantly improved the uplift capacity of anchor plates. It was found that the inclusion of one layer of GFR, which rested directly on the top of the anchor plate, was more effective in enhancing the anchor capacity itself than other methods. It was found that by including GFR the uplift response was improved by 29%. Multi layers of GFR proved more effective in enhancing the uplift capacity than a single GFR reinforcement. This is due to the additional anchorage provided by the GFR at each level of reinforcement. In general, the results show that the uplift capacity of symmetrical anchor plates in loose and dense sand can be significantly increased by the inclusion of GFR. It was also observed that the inclusion of GFR reduced the requirement for a large L/D ratio to achieve the required uplift capacity. The laboratory and numerical analysis results are found to be in agreement in terms of breakout factor and failure mechanism pattern.
