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| 1 | Unified calculation method and its application in determining the uniaxial mechanical properties of concrete显示文摘This paper presents a unified calculation method and its application in determining the uniaxial mechanical properties of concrete with concrete strengths ranging from 10 to 140MPa.By analyzing a large collection of test results of the uniaxial mechanicalproperties of normal-strength,high-strength and super high-strength concrete in China and performing a regression analysis,unified calculation formulas for the mechanical indexes of concrete are proposed that can be applied to various grades of concrete for determining the size coefficient,uniaxial compressive strength,uniaxial tensile strength,elastic modulus,and strain at peak uniaxial compression and tension.Optimized mathematical equations for the nonlinear stress-strain relationship of concrete,including the ascending and descending branches.under uniaxial stress,are also established.The elastic modulus is almost constant throughout the elastic stage for the ascending branches of the stress-strain relationship for concrete.The proposed stress-strain relationship of concrete was applied to the nonlinear finite element analysis of both a steel-concrete composite beam and a concrete-filled steel tubular stub column.The analytical results are in good agreement with the experiment results,indicating that the proposed stress-strain relationship of concrete is applicable.The achievements presented in this paper can be used as references for the design and nonlinear finite element analysis of concrete structures. | Faxing DING Xiaoyong YING Linchao ZHOU Zhiwu YU | 2011 | Frontiers of Structural and Civil Engineering2011，5，3： | 38 |
| 2 | Prediction of shield tunneling-induced ground settlement using machine learning techniques显示文摘Predicting the tunneling-induced maximum ground surface settlement is a complex problem since the settlement depends on plenty of intrinsic and extrinsic factors.This study investigates the efficiency and feasibility of six machine learning(ML)algorithms,namely,back-propagation neural network,wavelet neural network,general regression neural network(GRNN),extreme learning machine,support vector machine and random forest(RF),to predict tunneling?induced settlement.Field data sets including geological conditions,shield operational parameters,and tunnel geometry collected from four sections of tunnel with a total of 3.93 km are used to build models.Three indicators,mean absolute error,root mean absolute error,and coefficient of determination the(7?2)are used to demonstrate the performance of each computational model.The results indicated that ML algorithms have great potential to predict tunneling-induced settlement,compared with the traditional multivariate linear regression method.GRNN and RF algorithms show the best performance among six ML algorithms,which accurately recognize the evolution of tunneling-induced settlement.The correlation between the input variables and settlement is also investigated by Pearson correlation coefficient. | Renpeng CHEN Pin ZHANG Huaina WU Zhiteng WANG Zhiquan ZHONG | 2019 | Frontiers of Structural and Civil Engineering2019，13，6： | 20 |
| 3 | The behavior of a rectangular closed diaphragm wall when used as a bridge foundation显示文摘The rectangular closed diaphragm(RCD)wall is a new type of bridge foundation.Compared to barrette foundation,measuring the performance of RCD walls is relatively complicated because of their incorporation of a soil core.Using the FLAC3D software,this paper investigates the deformation properties,soil resistance and skin friction of a laterally loaded RCD wall as well as the settlement,axial force and load-sharing ratio of a vertically loaded RCD wall.Special attention is given to the analysis of factors that influence the performance of the soil core.It was found that under lateral loading,the RCD wall behaves as an end-bearing friction wall during the entire loading process.The relative displacement between the wall body and the soil core primarily occurs below the rotation point,and the horizontal displacement of the soil core is greater than that of the wall body.Under vertical loading,the degree of inner skin friction around the bottom of the soil core and the proportion of the loading supported by the soil core increase with increased cross-section size.The wall depth is directly proportional to the loading supported by the outer skin friction and the tip resistance of the wall body and is inversely proportional to the loading borne by the soil core. | Qiangong CHENG Jiujiang WU Zhang SONG Hua WEN | 2012 | Frontiers of Structural and Civil Engineering2012，6，4： | 13 |
| 4 | Factors affecting the seismic behavior of segmental precast bridge columns显示文摘这张手稿讨论潜在地影响部分预制 tensioned 以后桥墩的侧面的地震反应的设计参数。墩由有通过管的同心的腱的在其它上的叠的在扔期间在片断做了的预制的圆形的生气的节片断组成。墩的最底的片断在钢试管被装入箱内提高韧性并且最小化损坏。一个 FE 模型被用来调查不同设计参数并且他们怎么影响墩的侧面的力量排水量反应。调查的设计参数作为腱收益压力的一个百分比包括了起始的 tensioning 以后压力,水泥上的应用轴的压力作为精力 dissipaters 由于 tensioning 以后,墩方面比率,构造细节,钢试管厚度,和内部低碳钢 rebar 增加了。基于介绍的数据,在它的收益应力的 40%60% 的范围的一个起始的腱压力和约 20% 水泥特征强度的水泥上的起始的轴的应力为很典型的图案是适当的。这些设计价值将阻止腱让步直到侧面的飘移角度到达约 4.5% 。改变两个的钢试管厚度,高度,或联合证明了是可以被用来在一个特定的地震地区到达目标表演水平的一个有效参数。 | Haitham DAWOOD Mohamed ELGAWADY Joshua HEWES | 2014 | Frontiers of Structural and Civil Engineering2014，8，4： | 13 |
| 5 | A critical review of preparation design and workability measurement of concrete material for largescale 3D printing显示文摘 | Guowei MA Li WANG | 2018 | Frontiers of Structural and Civil Engineering2018，12，3： | 13 |
| 6 | Design concepts of an aircraft wing: composite and morphing airfoil with auxetic structures显示文摘 | P R BUDARAPU Sudhir Sastry Y B R NATARAJAN | 2016 | Frontiers of Structural and Civil Engineering2016，10，4： | 10 |
| 7 | A continuous/discontinuous deformation analysis(CDDA)method based on deformable blocks for fracture modeling显示文摘In the framework of finite element meshes,a novel continuous/discontinuous deformation analysis(CDDA)method is proposed in this paper for modeling of crack problems.In the present CDDA,simple polynomial interpolations are defined at the deformable block elements,and a link element is employed to connect the adjacent block elements.The CDDA is particularly suitable for modeling the fracture propagation because the switch from continuous deformation analysis to discontinuous deformation analysis is natural and convenient without additional procedures.The SIFs(stress intensity factors)for various types of cracks,such as kinked cracks or curved cracks,can be easily computed in the CDDA by using the virtual crack extension technique(VCET).Both the formulation and implementation of the VCET in CDDA are simple and straightforward.Numerical examples indicate that the present CDDA can obtain high accuracy in SIF results with simple polynomial interpolations and insensitive to mesh sizes,and can automatically simulate the crack propagation without degrading accuracy. | Yongchang CAI Hehua ZHU Xiaoying ZHUANG | 2013 | Frontiers of Structural and Civil Engineering2013，7，4： | 10 |
| 8 | Vibration analysis of multi-walled carbon nanotubes embedded in elastic medium显示文摘我们建议一个方法估计在有弹性的媒介嵌入的多围的碳 nanotubes (MWCNT ) 的自然频率。每嵌套的试管被当作通过内部试管的凡 der Waals 力量与邻近的 nanotubes 交往的一个单个酒吧。有弹性的媒介的效果通过一个有弹性的模型被介绍。数学模型最后被归结为一个 eigen 价值问题, eigen 价值问题被解决到达 MWCNT 的内部试管的回声。有不同参数的自然频率的变化被学习。从现在的方法的估计的结果与文学相比,结果被观察在靠近的同意。 | Pattabhi R. BUDARAPU Sudhir Sastry YB Brahmanandam JAVVAJI D. Roy MAHAPATRA | 2014 | Frontiers of Structural and Civil Engineering2014，8，2： | 10 |
| 9 | Technological development and engineering applications of novel steel-concrete composite structures显示文摘In view of China's development trend of green building and building industrialization,based on the emerging requirements of the structural engineering community,the development and proposition of novel resourcesaving high-performance steel-concrete composite structural systems with adequate safety and durability has become a kernel development trend in structural engineering.This paper provides a state of the art review of China's cutting-edge research and technologies in steel-concrete composite structures in recent years,including the building engineering,the bridge engineering and the special engineering.This paper summarizes the technical principles and applications of the long-span bi-directional composite structures,the long-span composite transfer structures,the comprehensive crack control technique based on uplift-restricted and slip-permitted (URSP)connectors,the steel plate concrete composite (SPCC)strengthen technique,and the innovative composite joints.By improving and revising traditional structure types, the comprehensive superiority of steel-concrete composite structures is well elicited.The research results also indicate that the high-performance steel-concrete composite structures have a promising popularizing prospect in the future. | Jianguo NIE Jiaji WANG Shuangke GOU Yaoyu ZHU Jiansheng FAN | 2019 | Frontiers of Structural and Civil Engineering2019，13，1： | 9 |
| 10 | Performance of a novel bent-up bars system not interacting with concrete显示文摘Increasing the bending and shear capacities of reinforced concrete members is an interesting issue in structural engineering.In recent years,many studies have been carried out to improve capacities of reinforced concrete members such as using post and pre-tensioning,Fiber Reinforced Polymer and other techniques.This paper proposes a novel and significant technique to increase the flexural capacity of simply supported reinforced concrete beams.The proposed method uses a new reinforcement bar system having bent-up bars,covered with rubber tubes.This technique will avoid interaction of bent-up bars with concrete.They are located in the zone where compressive and tensile forces act against one anothe匚The compressive force in the upper point of the bent-up bars is exerted to the end point of these bars located under neutral axis.Moreover,the tensile stress is decreased in reinforcements located under the neutral axis.This will cause the Reinforced Concrete(RC)beam to endure extra loading before reaching yield stress.These factors may well be considered as reasons to increase bending capacity in the new system.The laboratory work together with finite element method analysis were carried out in this investigation.Furthermore,bending capacity,ductility,strength,and cracking zone were assessed for the new proposed system and compared with the conventional model.Both the FEM simulation and the experimental test results revealed that the proposed system has significant impact in increasing the load bearing capacity and the stiffness of the RC beams.In the present study,an equation is formulated to calculate bending capacity of a new reinforcement bar system beam. | Aydin SHISHEGARAN Mohammad Reza GHASEMI Hesam VARAEE | 2019 | Frontiers of Structural and Civil Engineering2019，13，6： | 8 |
| 11 | Seismic performance of precast hollow bridge piers with different construction details显示文摘当前,预制的空具体的桥墩的设计计划将在中国在桥设计被采用,但是包括在高地震的风险区域的预制的部分墩的特定的设计细节没有代码。为有不同设计细节的空桥墩的地震性能的比较学习,空节桥码头的六个标本被设计并且测试。标本由整体的 cast-in-place 水泥桥墩组成,与联合的 cast-in-place 预制部分对的码头并且预制有干燥关节的部分具体的桥码头。结果证明所有标本有好排水量能力。有结合的对的海滨的桥墩展出更好的精力驱散能力和更高的力量。未结合的对的海滨桥墩显示更少的剩余塑料排水量和精力驱散能力。有在节的边的两个都结合的对的海滨的桥墩并且在节的中心未结合不仅展出更多的韧性能力和更少剩余塑料排水量,而且显示出更好的精力驱散能力。与对的桥列的试验性的结果相比,分析结果证明发达数字分析模型将提供合理、精确的结果。 | Zhiqiang WANG Jiping GE Hongyi WEI | 2014 | Frontiers of Structural and Civil Engineering2014，8，4： | 8 |
| 12 | Recent advances in geosynthetic-reinforced retaining Nails for highway applications显示文摘 | Jie HAN Yan JIANG Chao XU | 2018 | Frontiers of Structural and Civil Engineering2018，12，2： | 8 |
| 13 | Multiple linear regression, artificial neural network, and fuzzy logic prediction of 28 days compressive strength of concrete显示文摘评估在里面然而,借助于核心的压缩力量从变硬的水泥割了的 situ 水泥作为最平常的方法被承认自从它被象不同混合图案那样的许多因素影响,预言水泥的压缩力量是很困难的,混合的方法,治好条件,压缩,等等。在这份报纸,就试验性的结果而言,多重线性回归模型( MLR )的三个不同模型,人工的神经网络( ANN ),和适应neuro模糊的推理系统( ANFIS )被建立,训练,并且为与 173 个不同混合图案预言水泥的 28 天压缩的力量在 Matlab 编程环境以内测试了。最后,这三个模型与对方相比并且导致 ANN 和 ANFIS 模型使我们能然而,可靠地与不同混合图案评估水泥的压缩力量的事实因为在具体混合参数之间的非线性的关系,多重线性回归模型不在这个区域是足够可行的。最后,为具体压缩力量预言上的参数的二个不同集合的敏感分析(SA ) 被执行。 | Faezehossadat KHADEMI Mahmoud AKBARI Sayed Mohammadmehdi JAMAL Mehdi NIKOO | 2017 | Frontiers of Structural and Civil Engineering2017，11，1： | 8 |
| 14 | Assessment of bridge expansion joints using long-term displacement measurement under changing environmental conditions显示文摘This paper addresses the problem of condition assessment of bridge expansion joints using long-term measurement data under changing environmental conditions.The effects of temperature,traffic loading and wind on the expansion joint displacements are analyzed and interpreted,which reveal that measured displacements are observed to increase with an increase in temperature and to decrease with increased traffic loading,while the correlation between displacement and wind speed is very weak.Two regression models are developed to simulate the varying displacements under the changes in temperature and traffic loadings.Based on these models,the effects of the environmental conditions are removed to obtain the normalized displacement.Statistical process control using mean value control charts is further used to detect damage to the bridge expansion joints.The results reveal that the proposed method had a good capability for detecting the damage-induced 1.0%variances of the annual changes in the expansion joint displacements. | Youliang DING Aiqun LI | 2011 | Frontiers of Structural and Civil Engineering2011，5，3： | 8 |
| 15 | The smoothed finite element method (S-FEM):A framework for the design of numerical models for desired solutions显示文摘The smoothed finite element method (S-FEM) was originated by G R Liu by combining some meshfree techniques with the well-established standard finite element method (FEM). It has a family of models carefully designed with innovative types of smoothing domains. These models are found having a number of important and theoretically profound properties. This article first provides a concise and easy-to-follow presentation of key formulations used in the S-FEM. A number of important properties and unique features of S-FEM models are discussed in detail, including 1) theoretically proven softening effects;2) upper-bound solutions;3) accurate solutions and higher convergence rates;4) insensitivity to mesh distortion;5) Jacobian?free;6) volumetric-locking-free;and most importantly 7) working well with triangular and tetrahedral meshes that can be automatically generated. The S-FEM is thus ideal for automation in computations and adaptive analyses, and hence has profound impact on Al-assisted modeling and simulation. Most importantly, one can now purposely design an S-FEM model to obtain solutions with special properties as wish, meaning that S-FEM offers a framework for design numerical models with desired properties. This novel concept of numerical model demand may drastically change the landscape of modeling and simulation. Future directions of research are also provided. | Gui-Rong Liu | 2019 | Frontiers of Structural and Civil Engineering2019，13，2： | 7 |
| 16 | Unified description of sand behavior显示文摘In this paper,the mechanical behavior of sand,was systematically described and modeled with a elastoplastic model proposed by Zhang et al.[1].Without losing the generality of the sand,a specific sand called as Toyoura sand,a typical clean sand found in Japan,has been discussed in detail.In the model,the results of conventional triaxial tests of the sand under different loading and drainage conditions were simulated with a fixed set of material parameters.The model only employs eight parameters among which five parameters are the same as those used in Cam-clay model.Once the parameters are determined with the conventional drained triaxial compression tests and undrained triaxial cyclic loading tests,then they are fixed to uniquely describe the overall mechanical behaviors of the Toyoura sand,without changing the values of the eight parameters irrespective of what kind of the loadings or the drainage conditions may be.The capability of the model is discussed in a theoretical way. | Feng ZHANG Bin YE Guanlin YE | 2011 | Frontiers of Structural and Civil Engineering2011，5，2： | 7 |
| 17 | Research review of the cement sand and gravel(CSG)dam显示文摘The cement sand and gravel(CSG)dam is a new style of dam that owes the advantages both of the concrete faced rock-fill dam(CRFD)and roller compacted concrete(RCC)gravity dam,because of which it has attracted much attention of experts home and abroad.At present,some researches on physic-mechanical property of CSG material and work behavior of CSG dam have been done.This papcr introduces the development and characteristics of CSG dam systematically,and summarizes the progress of the study on basic tests,constitutive relation of CSG material and numerical analysis of CSG dam,in addition,indicates research and application aspect of the dam. | Xin CAI Yingli WU Xingwen GUO Yu MING | 2012 | Frontiers of Structural and Civil Engineering2012，6，1： | 7 |
| 18 | Experimental study and field application of calcium sulfoaluminate cement for rapid repair of concrete pavements显示文摘 | Yanhua GUAN Ying GAO Renjuan SUN Moon C. WON Zhi GE | 2017 | Frontiers of Structural and Civil Engineering2017，11，3： | 7 |
| 19 | Damage on lining concrete in highway tunnels under combined sulfate and chloride attack显示文摘 | Rongrong YIN Chenchen ZHANG Qing WU Baocheng LI He XIE | 2018 | Frontiers of Structural and Civil Engineering2018，12，3： | 7 |
| 20 | Analysis of cement-treated clay behavior by micromechanical approach显示文摘Experimental results show the significant influence of cement content on the mechanical properties of cement-treated clays.Cementation is produced by mixing a certain amount of cement with the saturated clay.The purpose of this paper is to model the cementation effect on the mechanical behavior of cement-treated clay.A micromechanical stress-strain model is developed considering explicitly the cementation at inter-cluster contacts.The inter-cluster bonding and debonding during mechanical loading are introduced in two ways:an additional cohesion in the shear sliding and a higher yield stress in normal compression.The model is used to simulate isotropic compression and undrained triaxial tests under various confining stresses on cement-treated Ariake clay and Singapore clay with various cement contents.The applicability of the present model is evaluated through comparisons between numerical and experimental results.The evolution of local stresses and local strains in inter-cluster planes are discussed in order to explain the induced anisotropy due to debonding at contact level under the applied loads.The numerical simulations demonstrate that the proposed micromechanical approach is well adapted for taking into account the main physical properties of cement-treated clay,including damage and induced anisotropy under mechanical loading. | Dong-Mei ZHANG Zhen-Yu YIN Pierre-Yves HICHER Hong-Wei HUANG | 2013 | Frontiers of Structural and Civil Engineering2013，7，2： | 6 |
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