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

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Seismic and Durability Assessment of Externally Bonded FRP Retrofits in Reinforced Concrete Structures After 2018 Anchorage, AK Earthquake 10th

Seismic and Durability Assessment of Externally Bonded FRP R...

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

作者： Milev, Sandra Ahmed, Shafique Hassan, Mariam Sattar, Siamak Goodwin, David Tatar, Jovan Univ Delaware Newark DE 19716 USA Echem Consultants LLC Poughkeepsie NY USA NIST Gaithersburg MD 20899 USA

ISBN: (纸本)9783030881665;9783030881658

Externally bonded fiber-reinforced polymer (EBFRP) composites are a cost-effective material used for repair and seismic retrofit of existing concrete structures. Even though EBFRP composites have been extensively utilized over the past 20 years as seismic retrofits, there are few data documenting their performance in a real shaking event or after long-term use on concrete structures. In this study, semi-destructive and non-destructive techniques were employed to evaluate the performance and durability of EBFRP-retrofitted buildings that had experienced the 2018 Cook Inlet Earthquake in Anchorage, AK. The performance of EBFRP was evaluated and documented through photographic evidence. Acoustic sounding, infrared thermography, and bond pull-off tests were utilized to evaluate the quality of bonding between the EBFRP and concrete. EBFRP samples were also collected from building interiors and exteriors for chemical and thermal analysis to evaluate the long-term effects of environmental exposure. Although environmental conditions were found to influence the bond quality between the EBFRP composite and concrete substrate, no major signs of earthquake damage to the building components retrofitted with EBFRP were noted. Materials characterization results demonstrated no evidence of polymer matrix degradation in exterior EBFRP samples.

关键词： EBFRP retrofit Seismic Deterioration Reconnaissance Durability Materials characterization

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Testing vs Application Issue for Fiber Reinforced Materials 10th

Testing vs Application Issue for Fiber Reinforced Materials

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

作者： Bilotta, Antonio Lignola, Gian Piero Univ Napoli Federico II DiSt Dept Struct Engn & Architecture Naples Italy

ISBN: (纸本)9783030881665;9783030881658

The strengthening of masonry structures is nowadays performed by means of High-strength fibers embedded in inorganic matrix (Fiber Reinforced Cementitious Mortar materials, FRCM). In such materials lime or cement-based matrix is used instead of epoxy adhesive to reduce debonding issues between substrate and matrix, however some sliding phenomena and cohesive failures between fibers and the matrix mortar can occur. The main aim of this research is to examine the impact on the FRCM efficiency of the mechanical properties of fiber and matrix and potential geometrical defects, which are possible in real field applications. Discussion is based on the predictions obtained through an analytical model recently developed by the authors to investigate the local effects of adherence that affect the mechanical behaviour of FRCMs. The topic is particularly important and greatly discussed in the scientific community and among manufactures and practitioners, because the bond test has a significant role, as it is used for the qualification of the material, providing sometimes very scattered results. The model represents an attempt to reproduce the variability typically found in the experimental bond tests performed on FRCM systems for qualification purposes and to find solution to reduce this scatter and, overall, correlate this scatter to the performance in real application. The model was then applied to the typical cases of PBO-FRCM and Glass-FRCM to analyse slip and stresses in the bundle and in the matrix for different defects due to application issues.

关键词： FRCM Cementitious matrix Fiber Strengthening system Bond behaviour

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Mechanical Characterization of GFRP Through Experimental Dynamic Testing 10th

Mechanical Characterization of GFRP Through Experimental Dyn...

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

作者： Beserra, Jesse Gaspar, Cassio Cardoso, Daniel Pontifical Catholic Univ Rio de Janeiro Dept Civil & Environm Engn Rio De Janeiro Brazil

ISBN: (纸本)9783030881665;9783030881658

The use of pultruded glass-fiber reinforced polymer (GFRP) has increased in recent years, with important applications for footbridges, bridge decks, cooling towers, among other. The mechanical characterization of GFRP in terms of elastic properties is often carried out by means of destructive static tests specified in international standards, but it may be a quite tedious activity given the number of properties to be determined. An alternative approach consists in the use of non-destructive techniques based on dynamic testing, also known as experimental modal analysis (EMA). This work aims to identify the dynamic properties of thin-walled GFRP members regarding their natural frequencies, mode shapes and damping ratios. These experimental dynamic characteristics obtained for a C-channel beam are, then, used to determine specific material elastic properties back-calculated using numerical optimization process. It is shown that the properties determined through dynamic testing are in relatively good agreement with those obtained from classical destructive tests. This non-destructive technique is an alternative approach for the mechanical characterization of GFRP members, especially important for low cost in situ quality control.

关键词： Glass-fiber reinforced polymer Dynamic testing Experimental modal analysis Mechanical characterization

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Modelling Residential House Pricing Using Regression Analysis

Modelling Residential House Pricing Using Regression Analysi...

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

作者： Sridhar, M. B. Sathyanathan, R. SRM Inst Sci & Technol Dept Civil Engn Kattankulathur 603203 Tamil Nadu India

ISBN: (纸本)9789811658396;9789811658389

The paramount ingredient for the socio-economic development of any country is the land and buildings. An accurate appraisal of these land and buildings' value has a colossal effect on the state's economy. Still, the value of these buildings has been outrageous with realtors' emergence. Various computational techniques have been employed to resolve the issue of the appraisal of the value. The factor analysis, correlation analysis and linear regression analysis are employed in this paper in order to model the residential house prices. This study is to be carried out in the Chengalpattu neighbourhood, where the modelling of the residential house prices is considered. All the factors which account for house price were determined. The modelling is performed by taking the market prices and the various factors that account for the valuation using various software.

关键词： House pricing Regression Urban density

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Experimental Study on Flexural Behaviour of ECC-Concrete Composite Beams Strengthened with Carbon Fiber Sheet 10th

Experimental Study on Flexural Behaviour of ECC-Concrete Com...

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

作者： Tang, Rong Wang, Yi Ge, Wenjie Yan, Weihua YangZhou Univ Coll Civil Engn & Sci Yangzhou 225127 Jiangsu Peoples R China

ISBN: (纸本)9783030881665;9783030881658

In order to study the flexural behaviour of steel reinforced engineered cementitious composite (ECC)-concrete composite beams strengthened by carbon fiber sheet (CFS). Totally 12 ECC-concrete composite beam specimens with three types of ECC height replacement ratios strengthened by different layers of sheet and anchorage method (with and without CFS hoops) were made and their static flexural performance tests were conducted. The effect of layers of CFS, ECC height replacement ratio and anchorage method on the bearing capacity, deflection, crack and failure mode of strengthened ECC-concrete composite beams were investigated. The test results show that compared with the unstrengthen beams, the crack width of strengthened ECC-concrete composite beam and the bearing capacity increased by 63% with the increase in the number of reinforced layers. The ultimate bearing capacity of the beams strengthened with CFS hoops increased by 8.6% when compared with that of counterpart without CFS hoops.

关键词： Carbon fiber sheet (CFS) Engineered cementitious composite (ECC) Concrete Composite beam Flexural behaviour

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Cost Analysis of Different Scenarios for Extracting Groundwater Contamination 1

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3rd International Conference on Green Environmental engineering and Technology (IConGEET) / 7th International Conference on Green Design and Manufacture (IConGDM)

作者： Kheimi, Marwan Salamah, Sultan K. Hassan, Mohd Ikhmal Haqeem King Abdulaziz Univ Fac Engn Rabigh Branch Dept Civil Engn Jeddah 21589 Saudi Arabia Taibah Univ Fac Engn Dept Civil Engn Madinah Saudi Arabia Univ Tun Hussein Onn Malaysia Fac Civil Engn & Built Environm Batu Pahat 86400 Johor Malaysia

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

Groundwater is an essential product for arid and semi-arid with dry climate region. The essence of groundwater is portrayed in areas where is low precipitation amount is occurred. Therefore, protecting the recharged aquifer from contamination plays a huge role to provide clean and easy to use pumped water for agricultural, industrial, commercial, and public use. In this paper, a conceptional of different scenarios is used to minimize the cost of extraction and transported plume pollutants from groundwater. The Interactive Groundwater model (IGW) has been implemented in Volusia County, north of Orlando area by utilizing parameters of hydraulic conductivity, storativity (specific yield) and layers depth from the SSURGO soil database. Also, the results of the model were compared with USGS groundwater levels from nearby well. The flow rates are grounded on the hydraulic conductivities (K), which have an initial average value of 11.3 m(3)/day, and it is randomly varied throughout the domain using spectral distribution function, the thickness (b), and the hydraulic gradient (h) comprises the boundary conditions for the modeled area. Three different scenarios have been adopted based on the EPA technical report to seek cost efficient and realistic scenario of removing pollutants. The model has depicted that the best-case scenario to implement is three injection wells and two pumping wells to get the best results needed.

关键词： Groundwater modeling Groundwater contamination Plume transport

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Research on Improvement Calculation Method of Design Thrust of Anti Slide Pile 1

引用

8th International Conference on civil engineering (ICCE)

作者： Hou, Xiaoqiang Liu, Jierui Wang, Xinfei Zhou, Zhongren Jia, Honglu Lanzhou Jiaotong Univ Sch Civil Engn Lanzhou 730070 Peoples R China China Construct Rd & Bridge Grp Co Ltd Shijiazhuang 050001 Hebei Peoples R China

ISBN: (数字)9789811912603

ISBN: (纸本)9789811912603;9789811912597

At present, based on the transfer coefficient method, most of the anti-slide pile design thrusts are calculated by the overload method and the strength reserve method respectively. Many algorithms only consider the remaining sliding force behind the pile and the safety factor that meets the requirements of the design conditions. Generally, the safety factor is the safety factor of the sliding slope behind the pile after the anti slide pile is reinforced. For the entire landslide, there are two safety factors before and after the pile, which is not the design safety factor target value, and there is a big difference between the safety factor and the treatment goal required by the specification. Through the study of the pile-soil interaction of anti-slide piles, it is believed that in addition to the active residual sliding force transmitted by the blocks behind the pile, the anti-slide piles are simultaneously subjected to the passive residual anti-sliding force transmitted upwards by the blocks in front of the pile. The stress analysis shows that: Firstly, according to the different active and passive properties of anti-sliding force transmission and sliding force transmission, the mechanical model of anti-sliding force transmission is studied, and the calculation formula of anti-sliding force transmission coefficient is derived;Secondly, It is believed that the anti-slide pile provides horizontal thrust to the landslide, and two components of the sliding surface direction and the vertical sliding surface direction are generated. The balance equation is established and the overload method and the strength reserve method of anti-slide pile thrust calculation formula are derived;Thirdly, according to the principle of setting piles in the anti-slip section, the optimal location of anti-slide piles are proposed;Fourthly, after verification of cases, the safety factors before and after the piles calculated by the overload method are basically equal, and consistent with t

关键词： Anti-sliding pile Design thrust Anti-sliding force transmission coefficient Location selection condition Safety factor

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Drought Assessment Using Standardized Precipitation Index (SPI) Case Study: Sulphur Springs Tampa FL 1

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3rd International Conference on Green Environmental engineering and Technology (IConGEET) / 7th International Conference on Green Design and Manufacture (IConGDM)

作者： Almadani, Mohammad A. King Abdulaziz Univ Fac Engn Dept Civil & Environm Engn POB 80200 Rabigh 21589 Saudi Arabia

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

Climate change and extreme events with Uncontrolled Urbanization cause environmental degradation and long-term impacts on human life. The water as the most precious commodity on the global has been affected as a result from this environmental degradation. The availability of fresh water in term of quality and quantity is an essential matter to be monitored and controlled to avoid subsequences that could be threaten for human life. Drought is emerging as a sign of water resource deterioration which required to be monitored and diagnosed. Drought events can be diagnosed from changing in precipitation, temperature, groundwater, and water resources. The drought indices are very important as an effective early warning system to help the decision makers for an appropriate measure to reduce the impacts of drought. In this study we are trying to assess the regional drought and its effect on the Sulphur Springs Nitrate concentration and the causes of Sulphur Springs streamflow depletion. Standardized Precipitation Index SPI Standardized Discharge Index (SDI) are used to estimate the dry and wet conditions. These conditions can by estimated on time scales verity based on precipitation records and data. The calculation of SPI index is based on rainfall distribution and long-term period for a specific location. The precipitation records should be normally distributed for fitting in the Standardized Precipitation Index SPI. A location has been selected to apply the method, then to be validated for other arid and semi-arid locations. The availability of data and weather conditions play a significant role for this selection. Monthly precipitation records during the period Jan-1988 to 2014 over Sulphur Springs County in Tampa, Florid, has been obtained to apply the Standardized Precipitation Index (SPI). These data will be used to compute and verify the SPI and SDI results. SPI is calculated at one location in Tampa, Florida to monitor the drought phenomena in regional scale. The b

关键词： SPI Standardized precipitation index Drought Precipitation Dry

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ANN Model for Joint Shear Strength of RC Interior Beam-Column Joint 6th

ANN Model for Joint Shear Strength of RC Interior Beam-Colum...

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

作者： Alagundi, Shreyas Palanisamy, T. Natl Inst Technol Karnataka Mangalore 575025 India

ISBN: (纸本)9789811671609;9789811671593

In the present study ANN model is developed to anticipate the Joint shear strength of interior Beam-Column joints. As there are many factors and parameters that influence the joint strength, it is challenging to determine the joint shear strength of joint. The current research aims to predict the Joint shear strength of the BeamColumn joint with the help of Artificial Intelligence. ANN models have recently gained popularity in civil and Structural engineering and have solved many non liner engineering problems. In the present research, ANN Model is constructed and the model is trained, tested and validated. Performance of the ANN model is measured by statistical relations. Error analysis is carried out to find out the deviation from experimental values. As the mean square error is less and correlation is nearly 95-100%, it has been concluded that the Present ANN model can accurately predict the Joint shear strength. The proposed ANN model is compared with design equations proposed by design code and found out that the ANN model shows more stability and accuracy.

关键词： ANN Joint shear strength Beam-column joint

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Factors of Obsolescence Affecting Adaptively Reused Shophouses in the Core Zone of Melaka, Malaysia 1

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

作者： Ab Rashid, Nor Syahila Heath, Tim Univ Sains Islam Malaysia USIM Fac Engn & Built Environm Dept Architecture Bandar Baru Nilai Nilai 71800 Negeri Sembilan Malaysia Univ Nottingham Fac Engn Dept Architecture & Built Environm Univ Pk Nottingham NG7 2RD England

ISBN: (数字)9789811686672

ISBN: (纸本)9789811686672;9789811686665

Fast economic growth and restructuring has resulted in a large number of obsolete buildings in large cities. Many of these buildings represent different eras and building typologies. Some, such as the distinctive shophouses of Southeast Asia, are important heritage legacies. The desire to undertake research related to the obsolescence of shophouses arises from the abandonment and demolition of many of these unique urban assets. Consequently, the aim of this paper is to examine the dimensions of obsolescence in adaptively reused shophouses in the Core Zone of Melaka. This research uses qualitative method through semi-structured interviews to gather information from three case study buildings. These three case study buildings were made up of shophouses which were converted into boutique hotels. NVivo software was employed to assist analysis for the collected data. The research findings indicate that functional and social obsolescence are the most dominant factors influencing all of the case study buildings. Further research is required to find the best formulas for revitalising and converting obsolete shophouses in this area for suitable uses, as this can inform policy and the success of the adaptive reuse of shophouses in the future.

关键词： Building obsolescence Adaptive reuse Traditional shophouses Melaka world heritage site Core zone of Melaka

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