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检索条件"丛书名=Lecture Notes in Civil Engineering"

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Compressive Strength Performance of Additives for Cement-Based Grouting Material with Low Water-Binder Ratio by Response Surface Methodology 8th

Compressive Strength Performance of Additives for Cement-Bas...

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8th International Conference on civil engineering (ICCE)

作者： Guo, Jiaxu Hu, Shaowei Zhao, Xuan Tao, Xiu Nie, Ying Chongqing Univ Sch Civil Engn Chongqing 400030 Peoples R China CISDI Engn Co Ltd Chongqing 401122 Peoples R China

ISBN: (纸本)9789811912603;9789811912597

In order to research the influence and the function mechanism of calcium formate and defoaming agent on the compressive strength of cement-based grouting material with low water-binder ratio at different ages, quadratic polynomial regression models were established by RSM, and the mix proportion was optimized. The function mechanism of additives was analysed by macroscopic mechanical properties and microstructure. The results indicated that the response surface method is scientific in optimizing the mix proportion of cement-based grouting material. The optimal mix proportion was obtained as fallow: the calcium formate was 0.64%, the water-binder ratio was 0.21 and the defoaming agent was 0.26%, with taking 1d, 3d, 28d compressive strength as the optimization objective. Calcium formate is highly significant for the early compressive strength of cement-based grouting materials with low water-binder ratio, while the water-binder ratio and defoaming agent are highly significant for that of the middle and late period. Calcium formate promotes the formation of CSH gel and Ca(OH)(2) crystallization in the early period, and the defoaming agent can effectively reduce macropores. The results can provide an optimization method for the mix proportion design of cement-based grouting material and a theoretical reference for its mechanical properties.

关键词： Cement-based grouting material Response surface method Compressive strength Calcium formate Defoaming agent Mix proportion

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Seismic Response Analysis Model for Full-Scale 10-Story RC Building of Shaking Table Tests (FY2015) 10th

Seismic Response Analysis Model for Full-Scale 10-Story RC B...

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Kang, Jae-Do Kajiwara, Koichi Natl Res Inst Earth Sci & Diasater Resilience Earthquake Disaster Mitigat Res Div E Def Miki Kagawa Japan Seoul Inst Technol Earthquake Disaster Mitigat Ctr Seoul South Korea

ISBN: (纸本)9783030881665;9783030881658

The world's 3D full-scale earthquake shaking table test facility, also known as E-Defense, was built by the National Research Institute for Earth Science and Disaster Resilience. The facility confirms the failure mechanisms of full-scale structures during earthquakes and verifies the effects of seismic retrofitting. In December 2015, shaking table tests of ten-story reinforced concrete buildings, of which structural system was the moment-resisting frame on a longer direction and frame with a shear wall on a shorter direction using the E-Defense, were conducted to gain building engineering knowledge about the continued use of buildings after a major earthquake and confirm the seismic performance of buildings designed on the basis All recommendations as well as examine its performance given by the newest Japanese design. In this study, we propose and investigated a numerical analysis model-a lumped mass multiple-degree-of-freedom system-to estimate the seismic resistance structural system used in the 2015 shaking table tests. The hysteretic models for story behavior are determined using the results of nonlinear static pushover analysis.

关键词： E-Defense MDOF model Moment-resisting frame Frame with shear wall

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Development of Artificial Neural Network Model for Prediction of Marshall Parameters of Stone Mastic Asphalt 6th

Development of Artificial Neural Network Model for Predictio...

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6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Thanh-Hai Le Hoang-Long Nguyen Cao-Thang Pham Huong-Giang Thi Hoang Thuy-Anh Nguyen Univ Transport Technol Hanoi 100000 Vietnam Le Quy Don Tech Univ Hanoi 100000 Vietnam

ISBN: (纸本)9789811671609;9789811671593

Stone Mastic Asphalt (SMA), firstly introduced in the 1960s, is a durable and rut-resistant asphaltmixture that uses stone-on-stone contact to improve strength, and a richmortar binder to provide durability. Marshall parameters, such as Marshall Stability (MS) and Marshall Flow (MF) are critical mechanical properties of SMA, representing the performance of asphalt concrete. The two Marshall parameters are widely used for the evaluation of resistance to displacement, distortion, rutting, and shearing stresses of SMA. As the pavement is frequently subjected to traffic loads, it is highly required to find out an optimum manner to determine these Marshall parameters. However, such a procedure is complicated, costly, and time-consuming. The primary aim of the present work is to develop an alternative numerical tool using artificial neural network (ANN) to predict the MS and MF of SMA mixtures. The results show that the ANN algorithm is an excellent predictor based on the excellent values of statistical criteria such as root mean square error, and the Pearson correlation coefficient. This study's results pave the way towards selecting a suitable machine learning approach to accurately determine theMarshall parameters of SMA mixtures.

关键词： Stone Mastic Asphalt (SMA) Marshall parameters Artificial neural network (ANN)

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Black Ink-Facilitated Dispersion of Multi-walled Carbon Nanotubes and Fabrication of MWCNT/Glass Fibre/Epoxy Hybrid Composites 10th

Black Ink-Facilitated Dispersion of Multi-walled Carbon Nano...

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Dalina, W. A. D. Wan Hidayah, I. Nurul Mariatti, M. Univ Sains Malaysia Sch Mat & Mineral Resources Engn Engn Campus Nibong Tebal 14300 Pulau Pinang Malaysia

ISBN: (纸本)9783030881665;9783030881658

Maintaining, and preferably improving, the structural integrity of glass fibre-reinforced composites based on thermosetting epoxy matrices are of significant interest in a wide range of applications including civil infrastructure. The application of nanoscale reinforcements to the surface of the fibres to improve mechanical interaction with the matrix has gained considerable attention in recent years. In the present study, commercial black ink was used as dispersing agent to disperse pristine multi-walled carbon nanotubes (MWCNTs) in deionised water. The MWCNT solution was deposited onto to glass fibre (GF)/epoxy via two different methods: spreading and spraying. The MWCNT loadings, together with the dispersion methods implemented, affected the properties of the composites fabricated. The spreading method was found to be more effective than the spraying method. The flexural strength of the hybrid composite with 0.6 vol % MWCNT loading (CNT0.6) was boosted to 268 and 219% of the 3GF and 4GF values, respectively. The storage modulus of CNT0.6 was increased by 24% compared to 4GF.

关键词： Fibres Mechanical properties Morphology Thermal properties Composites

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Identification of Cost Over Run Issue in Preventive Management in Construction Workplace-Chennai

Identification of Cost Over Run Issue in Preventive Manageme...

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International Conference on Advances in Construction Materials and Management (ACMM)

作者： Balasubramanian, M. Abinaya, T. L. Kumar, V. R. Prasath Gopinath, S. SRM IST Dept Civil Engn Chengalpattu 603203 Tamil Nadu India SRM IST Sch Architecture & Interior Design Chengalpattu 603203 Tamil Nadu India

ISBN: (纸本)9789811658396;9789811658389

Nowadays, construction industry is one of the cannonading industries that has a great impact on the economy of any nation. This report identifies the cost overrun issues in construction companies using preventive management activities in Chennai. A preventive management survey has been conducted in construction companies based on a literature and questionnaire survey. There are many serious hazards in the construction industry, including falling or being struck by heavy construction equipment, combined with the associated financial loss resulting from budget overrun, worker's compensation, indirect cost hikes, and impact of the profitability of any constriction operation. This paper aims to find the influencing factors causing accidents and thereby giving importance to those factors and preventing it from an occurrence. The most influencing factor has been identified through a questionnaire survey. The information has been assessed using statistical analysis to understand the circumstances well which will help scrutinize the factors. The tests such as reliability, ranking by RII (Relative Importance Index), and correlation for all the attributes were found to be good and so the data collected was highly consistent. The correlation test has been done and few factors are highly correlated. The RII has been calculated for every attribute and it has been found that effective preventive management can reduce the indirect cost and also avoid cost overrun and budget overrun. This study also proposes that the government should pay attention to enhancing legal enforcement and organizing safety training programs.

关键词： Construction management Cost overrun RII (Relative importance index) Construction safety Effective preventive management

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Strengthening in Shear of RC T-beams with CFRP Fabrics: Multilayer Versus Monolayer 10th

Strengthening in Shear of RC T-beams with CFRP Fabrics: Mult...

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： Samb, Ndongo El-Saikaly, Georges Chaallal, Omar Univ Quebec Dept Construct Engn Ecole Technol Super ETS Montreal PQ Canada

ISBN: (纸本)9783030881665;9783030881658

In recent years, manufacturers have developed new heavyweight CFRP sheets as an alternative to multilayer of lightweight CFRP to strengthen important RC structure components. However, there are still design and practical issues that need to be investigated, such as (i) the maximum number of CFRP plies that can be installed without exhibiting slippage or debonding, particularly when bonded on vertical surfaces;(ii) the effectiveness of shear strengthening with multilayer CFRP fabrics compared to a monolayer of equivalent total weight. The present study aims to evaluate and compare experimentally the behavior of reinforced concrete (RC) T-beams strengthened in shear with multilayer lightweight CFRP fabrics to that of a heavyweight CFRP monolayer of equivalent total weight. To this end, nine laboratory tests were performed on eight specimens strengthened with CFRP sheets in U-wrap schemes around the web and bonded continuously along the shear span, and one control specimen with no strengthening. The results are presented in terms of failure modes, gain in capacity due to CFRP, deflection, and strain responses experienced by the externally bonded CFRPs. Finally, the experimental results obtained are compared to the predictions of the current design codes and guidelines.

关键词： RC T-beams Shear strengthening CFRP fabrics Multilayer Monolayer

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Cyclic Response and Post-cyclic Settlement of Sand Experiencing Repeated Earthquakes 6th

Cyclic Response and Post-cyclic Settlement of Sand Experienc...

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6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Trung-Tri Le Park, Sung-Sik Woo, Seung-Wook Lam Tran Kyungpook Natl Univ Dept Civil Engn Daegu 41566 South Korea

ISBN: (纸本)9789811671609;9789811671593

This study evaluated the cyclic response and re-consolidation volumetric strain (epsilon(V)) of clean sand subjected to repeated earthquakes at non-fully liquefied stage. A series of repeated cyclic direct simple shear tests (CDSS) at various cyclic stress ratios (CSR) and followed re-consolidation phases were performed on loose sand. From the experimental results, CSR, number of applied shear event, shear strain induced by shaking event were factors influencing the cyclic behavior and epsilon(V). For non-liquefied samples subjected to repeated shear events, two concepts of maximum double amplitude shear strain (gamma(DA) max) and evolution of double amplitude shear strain (Delta gamma(E)DA) in relation to epsilon(V) were examined, in which (Delta gamma(E)DA - epsilon(V)) concept exhibited a better correlation and was suggested as an alternative approach for examining the dynamic response during shaking events induced by earthquakes.

关键词： Liquefaction Volumetric strain Cyclic shear strain Repeated earthquake

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Retrofitting Solution for an Existing Steel Frame Structure Sensitive to Global Torsion 10th

Retrofitting Solution for an Existing Steel Frame Structure ...

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10th International Conference on the Behaviour of Steel Structures in Seismic Areas (STESSA)

作者： Kober, Helmuth Stefanescu, Sebastian Cristian, Antonio Andrei Tech Univ Civil Engn Bucharest Bulevardul Lacul Tei 124 Bucharest 020396 Romania

ISBN: (纸本)9783031038136;9783031038112;9783031038105

The present paper shows a retrofitting solution for the steel structure of an existing hotel building, located in Tulcea County, Romania. The building has three storey and a curved layout, which makes the structure sensitive to global torsional effects. The constructed area of the building is about 2000 m(2). The central bay of the structure on transverse direction is 12.7 m, while the average length of the eight bays is about 4.5 m. The bottom storey height is 3.8 m and the current storey height is 5.5 m. The infrastructure consists in a network of foundation beams placed under all columns of the steel structure. The existing steel structure, designed in 2011, has some major deficiencies: sensitivity of the structure to global torsion;insufficient lateral stiffness, when subjected to horizontal seismic loads;unappropriated configuration of the connections among different structural elements;large floor deformations under gravitational loads;quite large floor vibrations could be noticed, when someone was dancing or jumping on the floors. The proposed retrofitting solution, consisted in introducing additional eccentrically connected braces, on both main directions of the existing structure.

关键词： Eccentrically braced frames Ductile connections Dissipative members Floor vibrations

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Prediction of Optimal Cross-Sectional Areas of Truss Structures Using Artificial Neural Networks 6th

Prediction of Optimal Cross-Sectional Areas of Truss Structu...

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6th International Conference on Geotechnics, civil engineering and Structures (CIGOS)

作者： Tran-Hieu Nguyen Anh-Tuan Vu Natl Univ Civil Engn Hanoi Vietnam

ISBN: (纸本)9789811671609;9789811671593

According to the traditional design process, designers usually design over and over again the same or very similar truss structures. This method is timeconsuming and it cannot take advantage of existing designs. In this paper, a machine learning-based method is proposed to determine the optimal design of truss structures. For this purpose, some trusses with various loading and design constraints are optimized using the Differential Evolution algorithm. The values of the applied load, the allowable stress, and the allowable displacement are stored as inputs while the optimized cross-sectional areas of members are collected as outputs of the training data. Then, a neural network model is trained to predict the optimal solution of trusses for new design inputs. The well-known 10-bar truss is used to illustrate the proposed method. The coefficient of determination R-squared is chosen to evaluate the effectiveness of the predictive model. The obtained R-squared value of approximately 1.0 indicates the predicted areas of truss members are very close to the true values.

关键词： Structural optimization Differential evolution Machine learning Neural networks Truss structure

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Thermo-mechanical Bonding Behaviour of CFRP NSM System Using Cement-Based Adhesive 10th

Thermo-mechanical Bonding Behaviour of CFRP NSM System Using...

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10th International Conference on Fibre-Reinforced Polymer (FRP) Composites in civil engineering (CICE)

作者： MohammadiFirouz, Reza Pereira, Eduardo Barros, Joaquim Univ Minho Dept Civil Engn ISISE Guimaraes Portugal

ISBN: (纸本)9783030881665;9783030881658

Near surface mounted(NSM) strengthening technique, using fiber reinforced polymer (FRP) composite materials, is one of the most promising solutions for dealing with the deterioration problems of current reinforced concrete (RC) structures. However, intense research is still ongoing to keep improving this technique in the cases where its application shows limitations, e.g. in cases of fire hazard. The bonding in NSM systems is usually guaranteed by polymeric matrices like epoxy adhesives. However certain drawbacks result from the use of these adhesives, such as low resistance to elevated temperatures. This characteristic leads to premature failure under these circumstances, preventing the mobilization of the exceptional load carrying capacity of carbon fibers. Thus, the development of solutions involving alternative adhesives seems technically and economically relevant. Cement-based materials, which are incombustible and show low thermal diffusivity, show great potential as a valid alternative. Recent investigations suggest the possibility of transferring stresses between the NSM system and concrete substrate using cementitious matrices. However, the performance of these materials in different loading conditions, including high temperature exposure, need to be better explored. This paper presents a study on the characterization of the bonding performance of CFRP NSM strengthening technique with cement-based adhesives using innovative surface treated carbon laminates installed into deep grooves. The CFRP laminates used in this study were manufactured specifically with sand-treated surfaces to improve the bonding performance between CFRP and cement-based adhesive by taking advantage of the better grip of the increased roughness surfaces. The results of the pull-out tests in ambient conditions, as well as after the exposure to elevated temperatures, are discussed. Monotonic bond tests results confirmed the effectiveness of the proposed approach for enhancing the bond st

关键词： CFRP High temperature NSM Cement-based adhesive Surface treatment

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