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

共 6935 条记录，以下是4871-4880 订阅

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Rock engineering Toolbox for the Follobanen Tunnels Under Existing Ekeberg Tunnels in Oslo, Norway 6th

Rock Engineering Toolbox for the Follobanen Tunnels Under Ex...

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

作者： Trinh, Nghia Quoc SINTEF Community SP Andersens Veg 3 Trondheim Norway

ISBN: (纸本)9789811671609;9789811671593

Just south of Oslo Central Station the new high-speed Follo Line railway tunnels pass beneath the existing Ekeberg road tunnels. This paper presents the numerical model, and monitoring program used to evaluate the stability of the E6 road tunnels during the excavation of the Follo Line tunnels at only less than 4 m below. The construction of the Follo Line was approved subject to three conditions: (1) There should be no negative effect on the stability of the Ekeberg tunnels, (2) The traffic flow in the Ekeberg tunnels must be maintained at all times and (3) Any risk of instability in the existing tunnels must be detected beforehand so that necessary precautionary action could be taken in good time. In order to deal with the challenges, SINTEF has developed a comprehensive rock engineering tool box, combining Investigation-Numerical model-Monitoring. The tool has been used successfully in this project to provide adequate information for excavation planning and control the situation to detect any unexpected situation.

关键词： Metro tunnel Numerical model Tunnel monitoring

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Ductility Classes in prEN 1998-1. Comparative Analysis on Eccentrically Braced Frames 10th

Ductility Classes in prEN 1998-1. Comparative Analysis on Ec...

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

作者： Stefanescu, Bogdan Catalin Tech Univ Civil Engn Bucharest Bucharest Romania

ISBN: (纸本)9783031038136;9783031038112;9783031038105

During severe earthquakes, it is desirable for a structure to be able to undergo significant plastic deformations and to develop a plastic mechanism. Codes usually manage this plastic behaviour ability of structures using ductility classes. The future version of the European code EN 1998-1, defines three such classes, DC1, DC2 and DC3, which are different from DCL, DCM and DCH that are used nowadays in the present version. The behaviour factor q is better managed in this future version and the difference in requirements among the three ductility classes is more accurately expressed. Under these circumstances, numerical testing of the new requirements is necessary. The present paper focuses on differences that can be noticed when designing eccentrically braced frames according to the three new approaches. An eccentrically braced frame with short links was considered. Three solutions were obtained for the crosssections of members, using the requirements defined for DC1, DC2 and DC3. As the "mathematical" procedure is put to test, the influence of the designer's skills was minimised as much as possible. All three structures were designed based on resistance requirements. The material consumption and the post-elastic behaviour were observed for each one of the three structural solution and comparisons are presented.

关键词： Ductility Ductility classes Eccentrically braced frames Seismic design Steel structures

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Seismic Design of Steel Frames by Improved Direct Displacement-Based Design Method 10th

Seismic Design of Steel Frames by Improved Direct Displaceme...

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

作者： Kalapodis, Nicos A. Muho, Edmond, V Beskos, Dimitri E. Univ Greenwich Dept Engn Sci Chatham ME4 4TB Kent England Univ Peloponnese Dept Civil Engn Patras 26334 Greece Tongji Univ Coll Civil Engn Dept Disaster Mitigat Struct Shanghai 200092 Peoples R China Univ Patras Dept Civil Engn Patras 26500 Greece

ISBN: (纸本)9783031038136;9783031038112;9783031038105

An improved direct displacement-based design approach for seismic design of plane steel moment-resisting frames is presented. The improvement stems from the use of a multi-degree-of-freedom equivalent system rather than the original direct displacement-based design method's single-degree-off-reedom equivalent system. As a result, higher modes and P-D effects are evaluated more prudently. The suggested approach utilizes deformation-dependent equivalent modal damping ratios and design modal displacements, which correspond to the first few significant modes, as a function of target interstorey drift ratios accounting for different performance levels. After combining a-compatible with various damping ratios-displacement design spectrum with the equivalent modal damping ratios and design modal displacements, one may calculate the necessary modal periods, stiffnesses and shear forces at the base. Through a modal combination rule, the base shear is computed and properly distributed to all storey levels. Via a numerical example of a 15 storey moment resisting frame, the benefits of the proposed method are highlighted.

关键词： Seismic design Direct displacement-based Performance-based design

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Upright Base Connection Impact on Structural Design of Steel Storage Rack Systems in Seismic Zones 10th

Upright Base Connection Impact on Structural Design of Steel...

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

作者： Nagy, Zsolt Sanduly, Annabella Tech Univ Cluj Napoca Cluj Napoca CJ Romania Gordias Cluj Napoca CJ Romania

ISBN: (纸本)9783031038136;9783031038112;9783031038105

The paper presents the investigation of the seismic behaviour of a particular configuration of a cold-formed steel storage racking system. The seismic study is focusing on the comparison of the behaviour of the same rack structural system under same loading conditions, same seismic loading but different upright base connection. The reference structure is considered with perfect pinned column base without uplifting possibility. Then, the influence on the behaviour of the structure is evaluated, introducing in the structural model the base plate uplift stiffness. The rack structural response is evaluated using nonlinear time history analysis. Results are expressed in terms of the magnitude of the base reaction forces, maximum sway deformation and variation of the fundamental eigen period of the rack structure. The performed nonlinear time history analyses confirms that dealing only with base plate uplift has a significant influence on the global response of the steel storage racking system hit by cross-aisle seismic action.

关键词： Steel storage racks Upright base uplift Cross-aisle seismic response

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Feasibility of Strongback System in Storey Mechanism Mitigation of Steel Braced Frames 10th

Feasibility of Strongback System in Storey Mechanism Mitigat...

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

作者： Chen, Lizhu Wang, Shuaikang Athanasiou, Anastasia Tirca, Lucia Concordia Univ Montreal PQ Canada

ISBN: (纸本)9783031038136;9783031038112;9783031038105

Under earthquake loading, conventional braced frames are prone to storey mechanism. To mitigate this drawback, researchers have proposed to add an alternative vertical force path to redistribute member forces among floors. Likewise the dual system, the strongback acts as a vertical elastic spine and compensates for the loss of storey shear after braces of ductile system exhibited buckling. Nevertheless, the inelastic first mode and the elastic higher vibration modes excite the strongback, which could be installed interior or exterior to the braced frame. A design method for strongback braced frame is proposed and a case study consisting of a 4-storey office building in Victoria, BC, Canada, is presented. Numerical model was developed in the OpenSees environment and results from nonlinear response history analyses, expressed in terms of interstorey drift, residual drift, and floor acceleration, are presented. The hybrid system is able to mitigate the storey mechanism and enhances the building's safety.

关键词： Strongback system Seismic response Storey mechanism Drift

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Hydrodynamic Modelling for the Chilia-Bystroe Danube Sector: Model Calibration and Validation 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： Tudor, Georgeta Deak, Gyorgy Arsene, Miruna Danalache, Tiberius Marcel Petculescu, Bianca Tuca, Danut Marian Bratfanof, Edward Zainol, Mohd Remy Rozainy Mohd Arif Natl Inst Res & Dev Environm Protect Bucharest IN 294 Splaiul Independentei6th Dist Bucharest 060031 Romania Univ Agron Sci & Vet Med Bucharest Bucharest Romania Dunarea de Jos Univ Galati Galati Romania Univ Sains Malaysia Sch Civil Engn Engn Campus Nibong Tebal 14300 Pulau Pinang Malaysia

ISBN: (数字)9789811679209

ISBN: (纸本)9789811679209;9789811679193

Morpho-hydrodynamic changes are one of the major problems affecting the abiotic sphere and the ecological status of water bodies. In order to assess the impact of the works carried out in the Bystroe Channel on the hydrodynamic and hydromorphological conditions of the Chilia and Old Stambul Danube branches, solid scientific based tools are required. Using MIKE 3 Flow Model and input data provided by in situ campaigns carried out by the National Institute for Research and Development in Environmental Protection Bucharest, an 8.5 km river length hydrodynamic model was developed, calibrated and validated in two independent river flow conditions. The model shown to provide high-confidence results (>90%) by comparative analysis of modelled versus measured values for water discharge and similarity in water velocity distribution for transversal control sections.

关键词： Hydrodynamic modelling Boundary conditions Model calibration Model validation Danube river Bystroe Channel

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Global Sensitivity Analysis for Bridge Crane System by Surrogate Modeling 6th

Global Sensitivity Analysis for Bridge Crane System by Surro...

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

作者： Van-Hai Trinh Viet-Tan Nguyen Khac-Quang Pham Le Quy Don Tech Univ LQDTU Hanoi 100000 Vietnam

ISBN: (纸本)9789811671609;9789811671593

As key equipment for lifting and transporting duties, cranes are used in various industrial fields in modern productions. Thus, the dynamic problem of such crane system is commonly encountered in the design process. This paper presents a Monte Carlo-based global sensitivity analysis of the dynamic model of a bridge crane system using the surrogate model technique. To this regard, physical modeling and differential equation motion of a coupled crane system is first derived using the Lagrange equation. Then, the numerical solution is offered by using the Newmark-beta integral method for characterizing dynamic responses of the crane system involving bridge beam, trolley, and payload. In order to compute Sobol sensitivity indices, the input-output correlation is formulated by a neural network-surrogate model formed from the numerical solutions. Finally, for the considered configuration, the importance levels of input variables with the corresponding estimated values of the first and total order sensitivity functions are demonstrated.

关键词： Overhead crane Dynamic response Global sensitivity Uncertainty Monte Carlo simulation Neural network-based surrogate

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Numerical Modelling of a Three-Story Building Using a Hybrid of Mass Timber Walls with Buckling-Restrained Braces 10th

Numerical Modelling of a Three-Story Building Using a Hybrid...

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

作者： Araujo, Gustavo A. R. Simpson, Barbara Ho, Tu X. Orozco, Gustavo F. O. Barbosa, Andre R. Sinha, Arijit Oregon State Univ Corvallis OR 97331 USA

ISBN: (纸本)9783031038136;9783031038112;9783031038105

Mass timber buildings are gaining popularity in North America as a sustainable and aesthetic alternative to traditional construction systems. However, several knowledge gaps still exist in terms of their expected seismic performance and plausible hybridizations with other materials, e.g. steel energy dissipators. This research explores the potential use of mass plywood wall panels (MPP) in spine systems using steel buckling-restrained braces (BRBs) as energy dissipators. The proposed BRB-MPP spine assembly makes up the lateral load-resisting system of a three-story mass-timber building segment that will be tested under cyclic quasi-static loading at Oregon State University. The specimen geometry and material properties result in BRBs that are shorter and of smaller core area than in most common steel structural applications. Small BRBs are prone to exhibit a hardened compressive response and fracture due to ultra-low-cycle fatigue when subjected to repeated cycles of large strain amplitude. These issues, along with the limited availability of test data, make small BRBs difficult to model. To support the experimental testing program, a material model with combined kinematic and isotropic hardening is calibrated against the available experimental data for three BRB specimens to estimate the behavior of BRBs of short length ( <= 3,500 mm [138 in]) and small core area (<= 2,600 mm(2) [4 in(2)]), similar to the ones designed for the test specimen. The calibrated model is used to predict the behavior of the BRB-MPP spine experiment.

关键词： Buckling-restrained brace Mass timber Spine system Numerical model

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A Cost-Benefit Analysis on Construction and Demolition Waste Recycling Project in Hanoi of Vietnam: Economic, Social, and Environmental Assessment 6th

A Cost-Benefit Analysis on Construction and Demolition Waste...

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

作者： Tong, Kien T. Nguyen, Hung, V Hoang, Han N. Tran, Tan, V Ishigaki, Tomonori Kawamoto, Ken Hanoi Univ Civil Engn Hanoi Vietnam An Viet Auditing Ltd Co Hanoi Vietnam Natl Inst Environm Studies Ibaraki 3058506 Japan Saitama Univ Grad Sch Sci & Engn Saitama 3388570 Japan

ISBN: (纸本)9789811671609;9789811671593

With the rapid development of the construction industry, construction and demolition waste (CDW) is causing many negative impacts to the economy, society, and environment in Vietnam. This is due to common treatment methods such as landfilling and/or improper dumping into the environment. Therefore, the promotion of CDW recycling and investment in CDW recycling plants are regarded as urgent issues. This paper examines the efficiency of a proposed CDWrecycling project built in Hanoi-Vietnam by performing a cost-benefit analysis including financial analysis and economic analysis. The economic, social, and environmental benefits resulting from the project will be discussed based on the monetary value. The results show that the project is completely financially viable, although the criteria for evaluating the financial performance obtained are quite low. Meanwhile, the project's economic efficiency is quite high with a present value of net benefits of about 260 billion VND and an internal rate of return is 31.6%. To improve efficiency and promote further investment in CDW recycling projects in Vietnam, government support is needed with a focus on the decisive factors for the effectiveness of CDWrecycling projects.

关键词： Construction and demolition waste (CDW) Cost-benefit analysis (CBA) Environmental assessment

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Monotonic and Cyclic Behaviour of Base-Plate Joints of Steel Storage Racks: An Experimental Study 10th

Monotonic and Cyclic Behaviour of Base-Plate Joints of Steel...

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

作者： Baldassino, Nadia Bernardi, Martina Zandonini, Riccardo Univ Trento Dept Civil Environm & Mech Engn Trento Italy

ISBN: (纸本)9783031038136;9783031038112;9783031038105

Industrial steel storage pallet racks are commonly used in the logistic field for storing goods and products. Several typical features characterize these structures, i.e. the use of cold-formed mono-symmetric perforated columns (uprights), the presence of beam-to-column and base-plate non-linear semi-rigid joints. In addition, bracing systems are provided only in the transversal direction (cross-aisle) while in the longitudinal direction (down-aisle) the structural global response is driven only by the joints performance. Therefore, being the baseplate and beam-to-column joints the sources of racks ductility, their key role becomes even more important in case of seismic actions. The design of racks is usually based on the 'design by testing' approach, which requires the complete characterization of racks main components and subassemblies. In case of seismic design, tests must be performed in the cyclic regime. In this context, experimental studies were performed in the past for the cyclic characterization of beam-to-column joints. On the contrary, although the key role of base-plate joints is well recognized, the available experimental studies regarding this component are still quite limited. As a contribution to this topic, an experimental study focused on the characterization of a commercial pallet rack base-plate joint was performed at the Universita di Trento. The study comprised both monotonic and cyclic tests. The present paper describes and discusses the main features and the main results of the experimental programme.

关键词： Steel storage racks Cold-formed steel Uprights Base-plate joints Cyclic and monotonic tests

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