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

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A New Seismic Coating System for Requalification of Existing Constructions 10th

A New Seismic Coating System for Requalification of Existing...

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

作者： Formisano, Antonio Univ Naples Federico II Sch Polytech & Basic Sci Dept Struct Engn & Architecture P Le V Tecchio 80 I-80125 Naples Italy

ISBN: (纸本)9783031038136;9783031038112;9783031038105

The current trend in the retrofit of existing buildings is to think mainly to environmental aspects, giving few attention to seismic issues. Contrary, recent EU's policies in this field are based on integrated approaches able to improve both energy and earthquake performances of the existing built-up. Therefore, the so-called seismic coats have been launched on the building market. In this framework, the design of a new envelope system, named DUO SYSTEM, for seismic-environmental requalification of existing constructions made of masonry or reinforced concrete is presented and illustrated in the present paper. The novel seismic-environmental coating system is composed of a cold-formed aluminium framed structure equipped with a shear wall system, represented by either OSB panels or aluminium alloy trapezoidal sheeting, which are designed according to the Sheeting Braced Design theory. In the current work, firstly, the novel seismic coat has been presented by detailing all its components. Secondly, the antiseismic solutions based on OSB shear walls have been used for upgrading two existing school buildings, one made of masonry and the other made of reinforced concrete. Finally, the comparisons of performances of examined buildings before and after the intervention have been made to evaluate the benefits provided by the proposed coating system under seismic and environmental viewpoints.

关键词： Existing buildings Seismic vulnerability Seismic envelope Aluminium alloy systems OSB panels

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Settlement and Capacity of Piles Under Large Number of Cyclic Loads 4th

Settlement and Capacity of Piles Under Large Number of Cycli...

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4th International Conference on Transportation Geotechnics (ICTG)

作者： Chen, Renpeng Peng, Chunyin Wang, Jianfu Wang, Hanlin Zhejiang Univ Hangzhou 310058 Peoples R China Hunan Univ Changsha 410082 Peoples R China Hong Kong Polytech Univ Hung Hom Kowloon Hong Kong Peoples R China

ISBN: (纸本)9783030772383;9783030772376

This study reports a group of field tests on cyclically loaded piles installed in soft clay in Huzhou, China. Two 29.5 m long pipe piles were instrumented with transducers to measure the accumulated settlement at the pile-head, the pore water pressure and total pressure at the pile-soil interface, and axial load at the pile end, respectively. The major objective of the field testing is to gain a better understanding of the evolution of the pile-head settlement and the effective stress at the pile-soil interface. The results of cyclic loading tests under different combinations of static load and cyclic load are discussed with reference to changes in the pile capacity, the permanent settlement, and the radial stresses. It is found that the permanent settlement of piles can be characterized as quickly stabilized (QS), progressively developing (PD), and dramatically failed (DF) patterns. Under low-level loading (QS pattern), the pile-shaft earth pressure is nearly undisturbed, final gains in effective stress are observed due to slight dissipation of pore pressure. For intermediate-level loading (PD pattern), significant reductions in pore pressure, earth pressure, and effective stress are observed after cyclic loading. Regarding high-level loading (DF pattern), the quick accumulation of pore water pressure leads to a slight increase in earth pressure, resulting in a continuous decrease in effective stress.

关键词： Field testing Cyclic loading Long-term behaviors Soft clay

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Feasibility Study on Subgrade Stabilization of Pavement Using Lime and Fly Ash as Admixtures

Feasibility Study on Subgrade Stabilization of Pavement Usin...

引用

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

作者： Krishna, Sistla Vinay Parashar, Aayushi Sudarsan, J. S. Natl Inst Construct Management & Res NICMAR Pune 411045 Maharashtra India

ISBN: (纸本)9789811658396;9789811658389

The nature of the underlying layers of the pavement determines its life. Among these layers, the subgrade plays a very crucial role in aiding the load transfer mechanism as well as facilitates the drainage mechanism. India, being a developing nation, has focused a lot on infrastructure development of which highways are a huge part. Being an agriculturally driven nation, the available land for development of these pavements is agricultural in nature with soils of poor mechanical properties. Thus, in order to keep up with this pace, there's a need for an innovative solution and such solution is the soil stabilization technique. The work is focused on identifying the impact of lime and fly ash-induced admixture's impact on the various parameters of soil including the CBR, Maximum Dry Density (MDD), Liquid Limit (L.L), Plastic Limit (P.L), etc ..,. black cotton soil was blended by varying lime at 2% for three trials by keeping the fly ash constant at 7% of the total weight of the soil sample. The percentage increase in moisture content is 9.09% from soil to blended soil. MDD decreased with a percentage of 8.43% from soil to that of blended mixture. CBR increased by a steeping 92.83% from soil to blended soil i.e., from 1.59 to 22.19. The trend stayed the same for both lime and fly ash in the determination of the above properties. The results show that both lime and fly ash are suitable for enhancing the properties of soils that are clayey in nature.

关键词： Flexible pavement Black cotton soil Lime Fly ash CBR

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Study on Quantitative Evaluation Method for Local Buckling of Flange of H-Section Steel Beam by Micro Strain Amplitude Measurement 10th

Study on Quantitative Evaluation Method for Local Buckling o...

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

作者： Sun, Kaile Iyama, Jun Fukushima, Yoshihiro Univ Tokyo Dept Architecture Tokyo Japan

ISBN: (纸本)9783031038136;9783031038112;9783031038105

The final purpose of this research is to establish a method for evaluating damage and residual performance of steel structural member after local buckling occurred. This paper quantitatively clarifies the change of strain amplitude caused by local buckling through analysis and discusses the possibility of its application in local buckling damage assessment. When a small shape change occurs in the steel frame member due to local buckling, the distribution of strain amplitude caused by microtremor or small earthquake would change, and it is expected that damage assessment can be made by capturing this change. When a static cyclic loading analysis using a finite element model was performed to simulate the local buckling of the H-shaped steel beam, and at the step where the load returned to zero for each loading cycle, the ratio between the strain and displacement, which we call "local stiffness," is calculated and it was used to discuss the damage. As a result of the analysis, it was shown that the local stiffness changes as the local buckling progresses. If such changes in local stiffness can be captured by actual measurement, it is expected to lead to the establishment of damage evaluation technology.

关键词： H-shaped steel Local buckling FEM-analysis Cyclic load Damage evaluation

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Hydromechanical Behavior of a Tuff/Bentonite Mixture Treated with Cement 6th

Hydromechanical Behavior of a Tuff/Bentonite Mixture Treated...

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

作者： Demdoum, Abdellah Daheur, Elhadj Guesmia Loualbia, Hamza Bounouara, Zahra Ghembaza, Moulay Smaine Akgun, Haluk Univ Ghardaia Lab Math & Appl Sci BP 455 Ghardaia 47000 Algeria Ziane Achour Univ Djelfa Fac Sci & Technol Res Lab Civil Engn Djelfa Algeria Univ Sci & Technol Mohamed Boudiaf Oran Lab Mat Sol & Therm LMST Oran Algeria Djillali LIABES Univ Sidi Bel Abbes Lab Civil Engn & Environm Sidi Bel Abbes Algeria Middle East Tech Univ Dept Geol Engn Geotechnol Unit Ankara Turkey

ISBN: (纸本)9789811671609;9789811671593

Sandy soil-clay mixtures are commonly used as a liner/barrier material in various engineering applications, such as construction of hydraulic and waste containment. In this study, the hydromechanical characteristics of tuff-bentonite and tuff-bentonite/cement mixtures are investigated to propose a local barrier material. A series of free swelling, one-dimensional consolidation and falling head permeability tests for hydraulic characteristics as well as the direct shear test for mechanical characteristics were performed on four different tuff-bentonite mixtures and two different tuff-bentonite/cement mixtures. Test results show that the compressibility/swelling behavior of the mixtures increases with increasing bentonite content. The optimum amount of bentonite to achieve a permeability of less than 10(-9) m/s, which is a liner/barrier design requirement, was found at 8% and 10%. The results of the strength tests indicate that the apparent cohesion increases with the bentonite content, while the apparent angle of friction decreases. Concerning the optimal mix treated with 3% and 5% cement, the test results show that the permeability and compressibility/swelling behavior decrease with the added cement content, while the angle of friction and cohesion increase. Finally, it was concluded that the 8%

关键词： Bentonite Tuff Permeability

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Evaluation of Operational BRTS System in Bangalore

Evaluation of Operational BRTS System in Bangalore

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

作者： Krishna, Smitha Sathvik, S. Suchith, S. SRM Inst Sci & Technol Dept Civil Engn Kattankulathur 603203 Tamil Nadu India

ISBN: (纸本)9789811658396;9789811658389

Bengaluru, Karnataka, India is known as the "City of Two Wheelers" because of its large two-wheeler population;additionally, during rush hour the city's traffic is notoriously congested, resulting in traffic jams and lengthy travel times. To address this issue, the Bengaluru Municipal Corporation devised a plan to implement the BRTS in December 2006, and it was successfully implemented on a 16-km stretch, making Bengaluru the first city in India to do so. This system has dedicated bus lanes and signaling, and is thus independent of on-road traffic, to encourage Bengaluru motorists to take the BRTS instead of driving, with the goal of reducing traffic congestion and pollution. Currently, with a total system length of 66 km, and some more which is proposed, and 92 stations, sanctioned under the Jawaharlal Nehru National Urban Renewal Mission (JNNURM), BRTS is now one of the most significant transportation systems in Bengaluru. BRTS compares the cost, length, stations across each route, etc. between them. Each line of BRTS has different lengths, different corridor widths, and different number of stations. This study is for comparing these key factors through graphs, and then analyzing them.

关键词： BRTS routes Transportation systems Operational system Quantitative scores Qualitative scores

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Case Study of a Tall Building in Greece: Performance-Based Seismic Design and Assessment of Composite Coupling Beams 10th

Case Study of a Tall Building in Greece: Performance-Based S...

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

作者： Katsaveli, Konstantina Efthymiou, Evangelos Gavridou, Sofia Aristotle Univ Thessaloniki Inst Met Struct Dept Civil Engn Thessaloniki 54124 Greece Univ Calif Los Angeles UCLA UCLA Samueli Sch Engn Civil & Environm Engn Dept Los Angeles CA 90095 USA

ISBN: (纸本)9783031038136;9783031038112;9783031038105

In the last decades many modern metropoles have embraced high-rise construction within a sustainable vertical urban development plan to accommodate the increased needs for housing and commercial needs, accounting for the limited available space. This is not valid in Greece, one of the most seismic prone countries in the Mediterranean, where the adopted urban development model was significantly different due to socio-economic and political factors that led to strictly low/mid-rise construction. Nonetheless, with the launch of Ellinikon project in the Attica region, which includes six high-rise buildings, tall buildings represent an emerging topic of interest in Greece. This paper examines the case study of a tall building in Greece, based on current US practice. For the purposes of the study, the latest LATBSDC guidelines are used and performance-based seismic design principles are applied. By means of nonlinear structural analysis software, all pertinent design parameters are investigated, and through comparative study, an assessment of composite coupling beams' deployment is realized, highlighting their effectiveness in high-rise construction.

关键词： Tall buildings Structural systems Nonlinear analysis Performance-based design Seismic safety High-rise buildings Composite coupling beams

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Study on the Potential Reutilization of Dyes from Batik Textile Effluent as Dye Sensitizers in Dye Sensitized Solar Cell (DSSC) 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： Lee, Weng Yi Azhari, Ayu Wazira Halin, Dewi Suriyani Che Thottoli, Abdul Kareem Univ Malaysia Perlis Fac Civil Engn Technol Arau 02600 Perlis Malaysia Univ Malaysia Perlis Ctr Excellence WAREG Water Res & Environm Sustainabil Growth Perlis Malaysia Univ Malaysia Perlis Ctr Excellence Geopolymer & Green Technol CEGeoGT Kangar Perlis Malaysia Pocker Sahib Mem Orphanage Coll Dept Phys Tirurangadi Malappuram 676306 Kerala India

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

An alternative method for waste dyes management by reutilization as dye sensitizer of DSSC is introduced in this study. The waste dye based DSSCs are fabricated by using wastewater that is collected from fixing process, dewaxing process and effluent of batik industry using the standard fabrication method. Absorption spectra, band gap, dyes concentration, pH value as well as functional group are the important characteristics of photosensitizer that is being studied in this research. Among the processes, the DSSC that was fabricated from waste dyes produced from dewaxing process had the highest energy conversion efficiency (5.68 x 10(-8)%) due to its highest dye concentration. However, further study is required to improve the performance of waste dye based DSSC since its energy conversion efficiency is extremely poor compared to the current highest efficiency of 13% and undesirable in being applied in real life.

关键词： DSSC Textile effluent Dye sensitizers Solar cells

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Integrated Technology Geological Surveys 4th

Integrated Technology Geological Surveys

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4th International Conference on Transportation Geotechnics (ICTG)

作者： Boldyrev, Gennadii Penza State Univ Architecture & Construct Penza 440026 Russia

ISBN: (纸本)9783030772383;9783030772376

The paper presents the results of the development of integrated technology engineering and geological surveys and design foundations. It is shown that the currently existing information systems for data transmission and processing, information measuring systems allow not only to manage the process of testing soils and process test data, but also to simultaneously perform calculations of the deformation and strength of the foundation. Modern methods of field research of soils, such as static, dynamic and boring sounding, allow to obtain continuous information about the physical and mechanical properties of soils in depth and rather cheaply with an increase in the number of test sites within the studied survey area. The recording of sensing parameters data can be performed at any depth interval. Using known or local correlation equations and sounding data, soil depth characteristics are found. Further, the calculated values of the characteristics of the soils are determined, and then, the deformations and strengths are calculated directly in the field conditions during the soil sounding process. The proposed complex technology combines engineering and geological surveys and the design of building foundations into a single production process. The result is a reduction of the survey time due to the application of soil sounding methods with automated control of the test process and interpretation of test data. In this case, the results of engineering and geological research provide not only information about the properties of soils, but also an assessment of their influence on the behavior of the designed building or structure.

关键词： In-situ soil test Foundation design Information systems

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Vulnerability Curves of Existing Italian Industrial Steel Buildings Designed Without Seismic Criteria 10th

Vulnerability Curves of Existing Italian Industrial Steel Bu...

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

作者： Formisano, Antonio Meglio, Emilia Di Lorenzo, Gianmaria Landolfo, Raffaele Univ Naples Federico II Sch Polytech & Basic Sci Dept Struct Engn & Architecture P Le V Tecchio 80 I-80125 Naples Italy

ISBN: (纸本)9783031038136;9783031038112;9783031038105

The Italian earthquakes of the last 15 years highlighted the significant seismic vulnerability of industrial buildings, which represent structural typologies at high risk due to their noteworthy exposure. The paper concerns a parametric study on a class of Italian existing industrial steel buildings designed before 1980 without anti-seismic criteria. The choice of the specific class of warehouses is based on field surveys carried out filling the CARTIS-GL form in the municipality of Cercola, within the district of Naples. These buildings, having different geometrical dimensions, represent one of the most common steel industrial structures widespread in the Italian territory in those years. Five families of structural models, placed into different geographical areas, are designed with the calculation methods of the reference time. The seismic behaviour of the investigated industrial buildings is investigated through nonlinear static analyses. The results allow to plot vulnerability curves to be compared to seismic fragility curves derived from literature research. The comparison among curves is useful to estimate the effectiveness of the literature studies, as well as to evaluate the seismic damages suffered by investigated structures under different earthquake levels.

关键词： Industrial buildings Steel structures Seismic vulnerability Vulnerability curves Fragility curves

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