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

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Characterization of Debonding Strain in Lightweight Concrete T-Beams Strengthened in Flexure Using Different Levels of CFRP 10th

Characterization of Debonding Strain in Lightweight Concrete...

引用

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

作者： Zaki, Mohammed A. Rasheed, Hayder A. Alkhrdaji, Tarek Amer Univ Dubai Dept Civil Engn Dubai U Arab Emirates Kansas State Univ Dept Civil Engn Manhattan KS 66506 USA Struct Technol Inc Engn Columbia MD 21046 USA

ISBN: (纸本)9783030881665;9783030881658

The premature debonding of Fiber Reinforced Polymer (FRP) sheets has been well studied and documented for normal weight concrete. This type of failure mode can be averted by keeping the maximum FRP strain below the debonding strain in the FRP as specified by ACI 440.2R-17. However, the debonding strain in light-weight concrete has not been addressed or evaluated yet. Accordingly, this present paper investigates the characteristics of the debonding strain in light-weight concrete using full-scale reinforced concrete T beams strengthened with different levels of carbon fiber reinforced polymer (CFRP). These beams were prepared and strengthened in two series. The first series included three T beams (T1LW, T2LW and T3LW) that were cast with lightweight (LW) concrete. Beam T1LW was tested as a control, beam T2LW was strengthened with 2 layers of CFRP, and beam T3LW was retrofitted with four layers of CFRP. Series two consisted of three other T beams (T1NW, T2NW and T3NW) that were strengthened the same way as series one, but with normal weight (NW) concrete. Both series had identical cross section geometry, reinforcements, span length, concrete strength, and FRP properties. The debonding strains of the lightweight and normal weight concrete are compared, and the validity ACI 440.2R-17 equation for lightweight concrete is evaluated.

关键词： Lightweight concrete Debonding strain Strengthened T beams CFRP sheets

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Seismic Performance of CFRP Jacketed Sub-standard RC Columns Under High Axial Stress and Shear Demand 10th

Seismic Performance of CFRP Jacketed Sub-standard RC Columns...

引用

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

作者： Demir, Merve Nur Demir, Ugur Demir, Cem Ilki, Alper Istanbul Tech Univ Istanbul Turkey Izmir Inst Technol Izmir Turkey

ISBN: (纸本)9783030881665;9783030881658

In the last decades, lessons learnt from the major earthquakes, that occurred in many countries, brought revisions in prevailing seismic design codes. As a consequence of this phenomenon, the current building stock in Turkey is mainly comprised of reinforced concrete (RC) buildings which were designed according to different seismic design codes. The presented paper is a component of a comprehensive investigation which containing three variables i) high axial load ratio defined as axial load divided by the axial capacity, ii) high shear demand defined as the ratio of shear demand at flexural yielding to shear resistance and iii) low transverse reinforcement ratio owing to large spacing among steel reinforcements. Thus, a total of four full-scale square RC columns comprised of i) one column designed to comply with the former Turkish Seismic Design Code (TSDC, 1975) and ii) three columns which are not compliant to any design codes (referred as sub-standard), were tested under high axial load ratio, 0.4 for code-conforming and 0.75 for sub-standard columns, combined with reversed cyclic lateral loading. The columns were also designed to have high shear demand in the order of 0.62 and 0.80 for bare sub-standard according to ACI 318 (2019) and TBEC (2018) design codes as sometimes observed in existing sub-standard structures. In addition to that, the ratio of shear demand for the code-conforming column is calculated 0.43 and 0.50 as per design codes, respectively. Besides, the ratio of transverse reinforcement area to the minimum required transverse reinforcement area was 0.19 and 0.77 for sub-standard columns according to ACI 318 (2019) and TBEC (2018), respectively. For the code-conforming column, the aforementioned ratio was 0.57 and 1.32 for both design codes, in the same manner. One of the sub-standard columns was kept as a reference column while the other two of them have been externally jacketed with one layer or two layers of carbon fiber-reinforced polymer (CFRP)

关键词： CFRP Column Retrofitting Seismic Sub-standard

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Accuracy of Existing Theoretical Models on the Assessment of the Design Shear Capacity of Slender RC Beams with Steel and GFRP Rods Without Transverse Reinforcement 10th

Accuracy of Existing Theoretical Models on the Assessment of...

引用

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

作者： Kaszubska, Monika Kotynia, Renata Lodz Univ Technol Fac Civil Engn Architecture & Environm Engn Lodz Poland

ISBN: (纸本)9783030881665;9783030881658

The paper is devoted to the shear of slender concrete beams without transversal reinforcement flexurally reinforced with two types of reinforcement: steel and GFRP (glass fiber reinforced polymer). The research program included 29 single-span, simply supported T-section beams (b = 400 mm, b(w) = 150 mm, h(f) = 60 mm, h(tot) = 400 mm) with the axis span of 1800 mm The three point loaded beams (with the load located at a distance of 1100 mm from the support) had the shear span to depth ratio a/d in the range of 2.9-3.0 referring to the slender beams. The four times lower elasticity modulus of the GFRP reinforcement caused a gradual, progressive shear tension failure mode, opposite to the abrupt failure mode peculiar to the RC beams. The difference in the elasticity modulus of both types of reinforcement resulted in the increase in the shear capacity of the RC beams in the range between 30% and 66% comparing to the shear capacity of the GFRP reinforced beams with the same reinforcement ratio. The paper presents a comprehensive analysis of the test results in relation to the design shear capacity according to the selected theoretical models. The generalized assessment of computational analysis indicated that the predicted shear capacity values calculated according to selected models gave good agreement with the experimental results.

关键词： Shear Slender beams T-cross section beams GFRP Capacity Design models

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Structural Robustness of RC Frames Under Blast Events 1

引用

4th International Conference on Numerical Modelling in engineering (NME)

作者： Mennonna, Marco Francioli, Mattia Petrini, Francesco Bontempi, Franco Sapienza Univ Rome Dept Struct & Geotech Engn Rome Italy

ISBN: (数字)9789811681851

ISBN: (纸本)9789811681851;9789811681844

This paper presents a numerical procedure for the robustness quantification of RC frames under blast-induced damage scenarios. The procedure is supported by a non-linear numerical analysis, by quantifying the structural response at the global level (i.e., response of the structural system/frame to the blast-induced damage) and by obtaining the so-called "robustness curves", representing the residual strength of the structure under increasing damage levels. The procedure is then applied to a 2D RC frame structure. The sensitivity of the robustness curves with respect to a set of analysis parameters is discussed.

关键词： RC structures Structural robustness Blast Non-linear dynamics

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Performance Comparison on Water Demand Methods Applied at Pengkalan Gawi, Kenyir Lake, Malaysia 1

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5th International Conference on Architecture and civil engineering 2021 (ICACE)

作者： Azlan, Nor Najwa Irina Binti Mohd Norhisham, Shuhairy Malek, Marlinda Abdul Shkuri, Nur Syafiqah Mohd Zolkepli, Maslina Ean, L. W. Mohamad, Ani Munirah Univ Tenaga Nas Dept Civil Engn Coll Engn Kajang 43000 Selangor Malaysia Univ Tenaga Nas Inst Energy Infrastructures IEI Kajang 43000 Selangor Malaysia Univ Tenaga Nas Coll Energy Econ Social Sci Kajang 43000 Selangor Malaysia UPM Serdang Univ Putra Malaysia Fac Comp Sci & Informat Technol Seri Kembangan 43400 Selangor Malaysia Univ Tenaga Nas Inst Sustainable Energy Kajang 43000 Selangor Malaysia Univ Utara Malaysia Sch Law & Ctr Testing Measurement & Appraisal CeTMA Bukit Kayu Hitam 06010 Kedah Malaysia

ISBN: (数字)9789811686672

ISBN: (纸本)9789811686672;9789811686665

Every day, demand and supply of water resources rises along with the urbanisation, population, and technological advancement. The situation has brought up the needs to explore water demand of an area for the water authority to supply enough water to the people. The objective of the research is to compare the performance of Micro-Component Analysis (MCA) and National Water Service Commission (SPAN) Guideline with actual water demand implied at Pengkalan Gawi, Kenyir Lake, Terengganu, Malaysia. Actual water consumption and forecasted water consumption (MCA and SPAN Guidelines) are used to evaluate the performance accuracy. The method used to compare the performance of the models is statistical analysis of Mean Absolute Deviation (MAD), Mean Square Error (MSE) and Root Mean Square Error (RMSE). As a result, MCA produced statistical indices of MAD, MSE and RMSE of 28.32, 2165.89 and 46.54, respectively. Meanwhile, SPAN Guidelines resulted with 58.42, 17,128.23 and 130.87 of MAD, MSE and RMSE. The study conclude that MCA has better accuracy with lower value of statistical indices compared to the other model and eventually assist the water authorities in constructing sensible water plans for the area of same geographical state using the respective technique.

关键词： Micro-component analysis National Water Service Commission (SPAN) guideline Performance accuracy Statistical analysis

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Adhesively Bonded FRP Composites for Strengthening of RC Structures: Recent Advances 10th

Adhesively Bonded FRP Composites for Strengthening of RC Str...

引用

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

作者： Haghani, Reza Yang, Jincheng Hawileh, Rami Abdullah, Jamal Al-Lami, Karrar Colombi, Pierluigi D'Antino, Tommaso Chalmers Univ Technol Gothenburg Sweden Amer Univ Sharjah Sharjah U Arab Emirates Polytech Univ Milan Milan Italy

ISBN: (纸本)9783030881665;9783030881658

Bonding fiber reinforced polymer (FRP) composites to reinforced concrete (RC) structures has been accepted as a structurally-effective and cost-efficient strengthening and repair method. Research and development on this technique started in the Kliger et al., .Eur J Wood Prod 74:319-330, 2016s and a great deal of effort has been made to study different behavioral aspects of FRP bonded concrete structures ever since, whose results have been reflected in several design codes and guidelines. Despite the extensive research, there is still knowledge gaps limiting the application of FRP materials in infrastructure. Long-term performance and uncertainty related to environmental durability and poor structural behavior at elevated temperature are among the most critical barriers. There are also issues related to debonding and how to increase the strengthening effect by means of using prestressed FRP laminates. This paper presents a review of the most recent works on FRP bonded RC structures related to abovementioned aspects conducted by different research groups in Sweden, Italy, and UAE.

关键词： Fiber reinforced polymer (FRP) Strengthening Steel Debonding Long-term performance

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Study on Seismic Performance of Integrated Support of Steel Arch and Anchor in Loose Surrounding Rock of Highway Tunnel 8th

Study on Seismic Performance of Integrated Support of Steel ...

引用

8th International Conference on civil engineering (ICCE)

作者： Zhang, Zhigang Liu, Xiyuan Zhang, Chong Zhang, Jing Xu, Dongqiang Hebei Prov Expressway Yan Chong Construct Off Zhangjiakou Peoples R China Hebei Univ Technol Sch Civil Engn & Transport Tianjin Peoples R China

ISBN: (纸本)9789811912603;9789811912597

In order to study the seismic performance of the new support structure with the integration of steel arch and anchor rod under the bulk surrounding rock of highway tunnel, this paper takes Xinglinpu tunnel of Yanchong expressway as the engineering background and conducts the dynamic time-history analysis of the deformation, stress and plastic zone distribution of the tunnel second lining structure under the original support and the new support according to the specification and with the help of FLAC3D finite difference software. It is concluded that the seismic performance of the original support and the new support structure is basically the same. The new support structure reduces the number of anchors, the disturbance to the surrounding rock and the cost, so the new support structure is worth promoting.

关键词： Highway tunnel Scattered surrounding rock Seismic performance Dynamic response Numerical simulation

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Experimental Study of Reinforced Concrete Beams Strengthened with CFRP 1

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8th International Conference on civil engineering (ICCE)

作者： Hong, Yihong Shanghai Urban Construct Vocat Coll Shanghai 200438 Peoples R China

ISBN: (数字)9789811912603

ISBN: (纸本)9789811912603;9789811912597

To test the strengthening effect of CFRP sheets on reinforced concrete (RC) beams, an experimental study was performed on five RC beams to analyze the influence of the amount of CFRP sheets and the sustained load of RC beams on the strengthening effect. The results showed that CFRP sheets could significantly improve the bending bearing capacity of the beams. However, there was no linear relationship between the amount of CFRP sheets and the strengthening effect, and the load on the beams had a great impact on the rigidity of the beams in the yield stage.

关键词： Carbon Fiber Reinforced Polymer (Cfrp) Strengthening Reinforced-concrete beam Bending test

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E-planning and Its Potential Development in Vietnam's Urban Planning 6th

E-planning and Its Potential Development in Vietnam's Urban ...

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

作者： Le Dinh Phuoc Nguyen Giang Son Hanoi Architectural Univ Hanoi 100000 Vietnam

ISBN: (纸本)9789811671609;9789811671593

Today, terms including e-service, e-business, e-government and egovernance have become ubiquitous. Following this trend, electronic planning or e-planning has gradually gained its traction and well-developed in many developed countries. In Vietnam, e-planning has not been conceptually brought into existence yet. However, with the increasing commitment of the Vietnamese government to e-government transformation and incremental implementation of Information and Communication Technologies (ICTs) in the urban planning industry, switching the traditional mode in urban planning to an electronic mode is inevitable. Therefore, this paper aims to offer an indicative account of e-planning potential development in Vietnam's urban planning industry through critical analysis of the conducive environment that e-government and ICTs implementation have currently provided to a foreseen e-planning transition. Collectively, the paper elicits preliminary recommendations after providing a discussion on the potential benefits and pitfalls that e-planning mode can bring to urban planning in Vietnam.

关键词： E-planning E-government Smart development Urban planning Public participation Open data

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Preliminary Regression Study on Air Quality Inside a Road Tunnel: A Case Study in Vietnam 1

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8th International Conference on civil engineering (ICCE)

作者： Thu-Hang Tran Univ Transport & Commun Fac Civil Engn Hanoi Vietnam

ISBN: (数字)9789811912603

ISBN: (纸本)9789811912603;9789811912597

Normal air quality that ensures the visibility and brings no harmful impact to the health of the vehicle drivers is essential for all road tunnels. It is affected by various issues. In this paper, the air quality - meteorology - traffic volume correlations were quested in the case study of an opened road tunnel on Vietnam National Highway 1A. The linear regression modelling technics using the least squares method with 95% of confidence was executed. Four representative models of the total suspended particles and airborne lead concentration against the meteorological parameters (temperature, relative humidity, wind velocity) and the vehicle flow density inside tunnel were proposed. The correlations with the volatile organic compounds were also studied but no representative model was proposed. Further studies on a richer source of data were suggested. The study confirmed the role of the in-tunnel vehicle volume and the meteorology on the tunnel's air quality.

关键词： Air quality Meteorology Road tunnel

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