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This paper presents an elastic shear stress distribution theoretical model at the carbon fiber-reinforced polymer (CFRP)-adhesive interface of a single-rod and a multi-rod straight-pipe bonding anchor. A comparison between theoretical and finite element analysis results reveals that the accuracy of the theory can be used to guide the preliminary design of CFRP rod bonding anchors. The mechanical performance of the inner cone bonding anchor for multi-rods are evaluated within different coefficients of friction and inner inclined angles. Numerical results indicate that the straight-parabolic inner cone bonding anchor has a significant effect on reducing the shear force at the loading end.
Due to the difference material mechanical properties of FRP with those of concrete and steel, the behaviours of members incorporated FRP are consequential different to the traditional RC members and steel members. The conventional safety theory and design method developed based on the behaviours of the traditional RC members and steel members are not suitable for the members incorporating FRP. The mechanical behaviours of the members incorporating FRP are compared with that of the traditional RC members and steel members, and the safety method is anatomized. It is pointed out that the overall safety margin of a member can be represented by strength margin, deformation margin and deformation energy margin, but the safety factor is usually represented by strength margin for the traditional RC members and steel members, which is not suitable for the members incorporated FRP. A concept of the equivalent strength safety factor Keq composing the overall safety margin is presented, which give unified definition of safety factors for members with different kinds of mechanical behaviours. The suggested unified definition of safety factors is applied to the design method for external bonded FRP strengthening concrete beams, FRP-concrete composite beams, concrete beams reinforced FRP bars and FRP decks, respectively. Safety design suggestions for the members incorporating FRP are pointed out.
No abstract is provided for this article.
Using grid-type stirrups as transverse reinforcements in reinforced concrete (RC) columns can not only provide higher confinement of the concrete core but also lead to an improved concrete cover and better protection to longitudinal reinforcements when compared with conventional stirrups. Fiber-reinforced polymer (FRP) grids, which combine the advantages of grid-type stirrups and FRP composites, are viable for use as transverse reinforcement in square-section RC columns in corrosive environments. However, there were few researches addressing RC columns reinforced with FRP grids. To investigate the axial compressive behavior of RC columns transversely reinforced with FRP grids, experimental investigations were conducted on 17 short square-section columns in small scale (180 × 180 × 600 mm3). Columns were transversely reinforced by CFRP/BFRP grids, weld reinforcement grids (WRG), and steel hoops. The results indicate that although FRP grids could provide less confining pressure than WRG, their performance is better than that of conventional hoops. Finally, an analytical model for predicting the stress–strain behavior of concrete core reinforced with grid-type stirrups is proposed considering the arching action of the confined concrete core. The proposed model shows a good agreement with the present test results as well as those from the existing literature.
In quasi-static tests of large-scale structural columns and/or columns under large axial loads, the lateral friction force between the column and the loading system can become a significant problem: they may cause considerable deviation between the measured lateral force and the actual reaction force of the column, especially under large axial compression load. Many researchers have come up with different methods to reduce or eliminate the influence of such friction force. In this article, previous treatments on the lateral friction force in quasi-static tests are first discussed. A shear force measurement device, for accurate measurement of the friction force, is then presented and calibrated. Based on the friction forces measured by the device in real tests, a simple model is proposed to predict the lateral friction force in quasi-static tests. Using the model, the measured lateral force in such tests can be corrected to obtain the actual reaction force of the column when a friction measurement device is absent. The proposed model and the correction method are then validated using results from several previous tests.
Three high-strength lightweight aggregate concrete beams were tested for long-term deflections.By comparison with the test results of 3 beams in this paper and 31 beams in other references,it is found that the design methods in corresponding standards and other existing models are not consistent with the test results.Based on equivalent bending moment method,section curvature induced by shrinkage and creep is analyzed.A simplified approach to evaluate creep and shrinkage effects in cracked concrete beams is presented,which considers creep and shrinkage deflections separately.With a clear physical concept and a simple formulation,the values obtained by the proposed method are found to be in good agreement with the test results and improvement is observed in comparison with the other existing methods.
This article reviews the clinical studies on the application of acupuncture anesthesia in thyroid surgery over the past 5 years. Starting from the principle of acupuncture anesthesia, the authors explore the application of acupuncture anesthesia in thyroid surgery, its advantages and development. The summarized findings showed that acupuncture anesthesia has a better analgesic effect in thyroid surgery, which can reduce the occurrence of stress reactions, adverse reactions and complications, and is conducive to postoperative recovery. However, there is a lack of standardized operations. In the future, standardized operations can make acupuncture anesthesia more widely used and popularized.
An arch glass fiber reinforced polymer (GFRP) I-beam with a 600 mm height was developed based on the latest curved-pultrusion technique to overcome the most critical design issues of large-scale GFRP beams, including excessive deflections and premature buckling failures. To achieve this goal, a review was first conducted regarding the complex buckling behaviors of pultruded GFRP beams, building a theoretical basis for the development of the curved beam. Then, a series of three-point bending tests for beams were conducted at full scale, in which the typical failure modes, load-carrying capacities and deflection and strain data were obtained. Compression flange delamination was found to be the dominant failure mode. The load–strain curves for flange and web plates demonstrated that the proposed beams were exempt from local buckling issues. Additionally, an analytical study and finite element modeling were carried out. Excellent agreement between experimental, analytical and numerical studies was observed. The design approach for conventional straight profiles is readily applicable to curved beams as the difference is limited. In the end, a 20-m-long full-scale GFRP pedestrian bridge was designed, constructed and tested. The great potential of the proposed curved-pultruded GFRP arch beam was successfully demonstrated.
<p>Variable stiffness concepts enable structural adaptation to diverse environments, categorized as smart materials or specialized configuration designs. Multi-layered jamming (MLJ) provides a rapid, reversible, and easily controlled actuation method. This study examines MLJ-based variable stiffness components for rapid construction and energy dissipation in civil engineering, focusing on an MLJ- reinforced Tensairity beam and construction procedure. The numerical model shows the structure's enhanced load-bearing capability post-vacuuming. During large deformation, energy dissipation via interlayer friction produces hysteresis loops, which may benefit to mitigate dynamic responses. While these techniques show promise, challenges exist concerning material limits, application boundaries, quantification, and precise shape control. They could also find utility in environments with confinement pressures like soil or water, expanding the potential applications.</p>
Coral aggregates can replace natural aggregates in marine construction, substantially reducing construction costs and shortening construction period. This paper investigates the compression behavior of coral aggregate concrete (CAC) under uniaxial and triaxial loading, wherein lightweight aggregate concrete (LAC) and normal aggregate concrete (NAC) are used for comparison. The investigated variables include concrete type, concrete strength, lateral pressure and principal stress ratios. The results indicated that the compression behaviors of CAC were different from those of NAC but similar to those of LAC because coral aggregates are more porous and have lower strength than normal aggregates. Based on the test results from this paper and literature studies, constitutive models were suggested for CAC under uniaxial and conventional triaxial compression. Moreover, a failure criterion for LAC proposed in the literature was deemed applicable to CAC under active or passive confinement. The suggested models correlated well with the test results.
High strength steel is widely used in buildings, bridges, railways, and other structures. However, limited fatigue experiments have been conducted for cracked high strength steel plates with carbon fiber-reinforced polymer (CFRP) sheets. This paper describes an investigation into the fatigue behavior of unstrengthened and CFRP strengthened cracked Q345, Q460, and Q690 steel plates. First, the mechanical properties of these steels, which are dependent on the chemical composition and metallographic structure, were analyzed. Microalloying was found to refine the grain size and thereby enhance the strength. Second, 10 bare steel plates and nine strengthened steel plates were tested under fatigue loading at different stress ranges and stress levels (defined as the ratio of the maximum stress to the yield stress). For the unstrengthened specimens, the results show that the fatigue behavior at a 175.5 MPa stress range is best for Q690, followed by Q460 and then Q345. However, at the same stress level, the fatigue life of Q690 was shortest, followed by Q460 and then Q345. For the strengthened specimens, different failure modes were observed, and serious debonding occurred in Q690 steel under a 402.5 MPa stress range. CFRP strengthening technology can effectively increase the fatigue life (1.3–3.1 times) for all specimens except the Q690 specimen. The microstructure of the fracture surface was then investigated by scanning electron microscopy (SEM). Finally, a fit of material-related constants in fracture mechanics theory was obtained for the three categories of steel, and the fatigue life was predicted accurately using Paris' law.
Development of durable, cost-effective bridges is a pressing research topic. Previous research and field applications have shown that fiber reinforced polymer (FRP)-concrete hybrid sections, including beams and decks, are attractive options for bridge superstructures. To date, there have been many experimental results, analytical approaches, and field applications scattered in the literature. This paper aims to review and evaluate FRP-concrete hybrid sections in the context of bridge engineering. Two databases of flexural tests and push-out tests of shear connections are developed, respectively. The paper is organized as follows: First, the characteristics of materials and structural configurations are introduced according to the database of flexural tests. Then, six typical types of shear connections from the database of push-out tests of FRP-concrete shear connections are compared. Next, three typical failure modes and deformation of FRP-concrete hybrid sections are separately analyzed with necessary design equations. Finally, case studies and perspective future development are discussed.
为了明确不同栽培因子对‘绥杂7号’产量影响的综合效应,采用三因素二次通用旋转组合设计方法,建立了栽培密度、施肥量、播种日期与粒用高粱‘绥杂7号’产量之间的效应模型,经DPS统计软件检验,二次回归模型拟合度较好。建立的回归模型为:Y=8218.18312-446.78324X12-287.68422X22-567.34494X32。试验结果表明:密度、施肥量、播期3因子对产量的增产作用依次为播期〉密度〉施肥量,对密度与肥料、密度与播期、肥料与播期之间的交互效应分析得出:以上两两因子之间存在一定程度的正交互效应。模型经计算机模拟寻优,得到’绥杂7号’获得7330 kg/hm2以上产量的栽培因子组合方案为栽培密度17.154~18.846万株/hm2,施肥量为211.8~150.7 kg/hm2,播种日期为5月7号—5月12号。
In order to comprehensively assess the emission status of air pollutes from domestic waste treatment plants in mainland China, the basic statistical information of 31 provinces and cities in China was systematically collected and collated. The emission factor method was adopted to establish the 2016 list of air pollutants for the harmless treatment of domestic garbage in mainland China. The results showed that in 2016, the total amount of CH<sub>4</sub>, VOCs, NH<sub>3</sub>, TSP, PM<sub>10</sub>, and PM<sub>2.5</sub> gaseous pollutants discharged from domestic waste landfills was 3472084.50, 185117.10, 66.45, 54.94, 25.99, and 3.92 t, respectively. The total amount of CH<sub>4</sub>, SO<sub>2</sub>, NO<sub><i>x</i></sub>, NH<sub>3</sub>, VOCs, CO, TSP, PM<sub>10</sub>,PM<sub>2.5</sub>, and BC of gaseous pollutants discharged from incineration facilities was 25389.10, 6419.30, 70923.84, 221.36, 435.33, 3025.19, 221.36, 221.36, 2.21, and 2.86 t, respectively. Through the analysis of solid waste treatment sources, partial, and temporal distribution characteristics of air pollutants, and the proportion of incineration plants in the provinces and municipalities to the number of household harmless waste treatment plants, it was determined that the total amount of gaseous pollutants discharged from domestic waste incineration sources and landfill sources had an upward trend during the period 2010-2016. In 2016, domestic landfill treatment was the most important waste treatment method in China, and mainly concentrated in areas with moderate population density and large land resources, such as central and western regions. Domestic waste incineration treatment facilities are mainly concentrated in developed cities in the Yangtze River Delta, Pearl River Delta, and the Beijing-Tianjin-Hebei Region.
工作圈考察要“实”。对考察对象的考察,既注意听取上级主管领导的意见,又广泛征求下属单位的意见;既听取原单位领导班子成员、离退休老同志的意见,又到与考察对象业务往来较多的单位了解情况,注意与单位中具体从事人、财、物管理的人员谈话。
目的对阿莫西林克拉维酸钾干混悬剂(14:1)的含量均匀度和有关物质进行了研究,用来评价和确定制剂使用中的安全性及药物本身的内在质量。方法通过对制备得到的阿莫西林克拉维酸钾干混悬剂含量均匀度的测定和有关物质考察。从而确定阿莫西林克拉维酸钾干混悬剂质量的可控性。结果通过本文中所用方法对阿莫西林克拉维酸钾干混悬剂(14:1)中阿莫西林、克拉维酸钾的含量均匀度和有关物质测定结果说明制剂质量合格.所以在制剂使用中阿莫西林克拉维酸钾干混悬剂能确保其安全性。结论阿莫西林克拉维酸钾干混悬剂(14:1)中阿莫西林、克拉维酸钾的含量均匀度和有关物质的测定均能符合制剂要求。