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Armagan Korkmaz, Mustafa Duzgun

Evaluation Of Different Types Of Pushover Analyses For R/C Frame Structures

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Series: w78:2006 (browse)
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Bella Nguyen and Ioannis Brilakis

Minimising Misclassifications of Over-Height Vehicles Due to Wind

Abstract: Over-height vehicle strikes with low bridges and tunnels are an ongoing problem worldwide. While previous methods have used vision-based systems to address the over-height warning problem, such methods are sensitive to wind. In this paper, we propose a constraint-based approach to minimise the number of over-height vehicle misclassifications due to windy conditions. The dataset includes a total of 102 over-height vehicles recorded at frame rates of 25 and 30 fps. At this frame rate, we analysed sampling rates to determine the sufficient number of positive frames required to provide accurate warnings to drivers. Optical flow and KLT feature-tracker algorithm was used to detect and track feature points of motion. Motion captured within the region of interest was treated as a standard two-class binary linear classification problem with 1 indicating over-height vehicle presence and 0 indicating noise. The algorithm performed with 100% recall, 83.3% precision and false positive rate of 8.3%.

Keywords: Bridge Strike, Tunnel Strike, Over-Height Vehicle, Over-Height Vehicle Detection System, Bridge Strike Prevention

DOI: https://doi.org/10.24928/JC3-2017/0249

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Series: jc3:2017 (browse)
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Bjork, Bo-Christer; Huovila, Pekka; Hult, Sven

Integrated Construction Project Document Management (ICPDM)

Abstract: The emphasis in research concerning methods for computer integrated construction has recently been on advanced data base techniques (product models) and AI applications. Another type of computer-aid for integration which could have a significant impact on practice in a shorter time-frame focuses on the management of the different documents which are produced by the different participants in the construction process. A functional description of such an integrated construction project document management (ICPDM) system is presented in the paper.

Keywords: Document management, Integration, conceptual model, EXPRESS

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Series: other (browse)
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Duhovnik J, Dolinsek B

Computer modeling of robotic assembling of reinforcement

Abstract: The paper describes the functional des@ of a robot system for the assembling of the reinforcement cages for beams and columns. The robot system was developed using a graphic simulation program. The robot cell consists of a frame structure, a supporting mechanism, two robots for moving and assembling of rebars and stirrups, a robot for bending of stirups, a robot for connecting of rebars and stirrups, and a storage table for delivery of rebars and laying down of manufactured reinforcement cages.

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Full text: content.pdf (672,492 bytes) (available to registered users only)

Series: w78:1996 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.software-machine (0.133666) class.software development (0.007740) class.software-software (0.006613)
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Permission to reproduce these papers has been graciously provided by the University of Ljubljana. The assistance of the editor, Prof. Ziga Turk, is gratefully appreciated.


Elenas A

Computer supported evaluation of interrelations between seismic acceleration parameters and the behaviour of structures

Abstract: This paper describes first some acceleration parameters of seismic excitations. Next, a nonlinear analysis of a reinforced concrete plane frame is carried out to elaborate the influence of the aforementioned parameters on the behaviour of the structure. Damage indicators in the form of cross sectional ductility demand are then evaluated and correlated with the strong motion characteristics. Furthermore, the ductility demand is compared with the cross sectional ductility supply of the structure. The aim of this computer supported study is t o extract among the several here presented seismic parameters, those which have drastic affection on the damage indicators of the structures.

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Series: ecce:1997 (browse)
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Fang C F, Froese T

Cost estimation of high performance concrete (hpc) high-rise commercial buildings by neural networks

Abstract: Neural network approach is applied to establish relationships between the quantities/cost of the concrete/formwork, which is required for the structural elements of tall buildings using high performance concrete (HPC), and the design variables. Hybrid and hierarchical strategies are proposed for the cost estimation, where the feed-forward networks are adopted. After training, the neural networks are utilized to predict automatically the quantities/cost of HPC wall-frame structures in tall commercial buildings. Verifications are conducted with respect to various sets of the design parameters and a comprehensive discussion is given.

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Full text: content.pdf (441,813 bytes) (available to registered users only)

Series: w78:1999 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.analysis (0.077873) class.economic (0.017519) class.communication (0.013234)
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Permission to reproduce these papers has been graciously provided by the Research Press of the National Research Council of Canada. The support of the editors, particularly Dr. Dana Vanier, is gratefully appreciated.


Futcher K G

User survey on a wan portfolio M.I.S. used for porfolio/project management in Hong Kong.

Abstract: This paper presents the results of recent research into the user expectations for a Management_Information_System (MIS) for the project/portfolio-managed delivery of a large and diverse range of projects. In 1998, the Works Bureau of the Government of Hong Kong undertook objective measurement of the extent that an MIS, called the PW_MS, contributed to the successful project and portfolio management of its large and diverse portfolio of more than two thousand public works projects. This rolling-programme of projects includes up to 72 types of public infrastructure. The delivery process depends on a highly differentiated organisation in which each of the public works departments has different staffing levels, workloads, locations, and each undertake different types of work. The objective of the assessment was to determine: the extent that the PW_MS was successfully used for the management of individual projects; the extent that the PW_MS was successfully used to help manage the portfolios-of-projects overall; the extent that other means of data collection and reporting that are otherwise used for both of these functions; and, to identify the requirements for an improved MIS. This paper presents the results of this postal survey of a population of five hundred and eighty-four authorised users of the PW_MS. It is a complex WAN system, with 168 terminals in the client and public works offices for operational access to the MIS. It has routines for the planning, reporting and monitoring of the cost, time and scope aspects of each project in the PWP. It establishes a fixed plan for each project and provides an audit trail of progress towards completion. The data in the system is combined to provide summary reports of portfolios of projects. A random selection from the User-population was used to form a population-sample for the postal questionnaire survey. The sample frame was constrained to ensure a 95% confidence limit that the response was statistically indicative of the population; and that it included sufficient numbers of the primary classes of users to also ensure a 95% confidence limit that the response was indicative of these strata of the population. This methodology is described in the paper. A sixty-five percent response was achieved. The results show that the User satisfaction with the PW_MS is not high. The results state a range of User dissatisfactions but they do not call for a fundamental change in approach: they validate the exploitation of proven, readily available, information technology for the management of portfolio-of-projects. Portfolio-management and project management is enabled by these techniques although the survey results indicate that more can be done to improve the man-machine interface. The results identify key-areas for such improvement. These findings are presented in the paper.

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Full text: content.pdf (182,628 bytes) (available to registered users only)

Series: w78:2001 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.social (0.023977) class.impact (0.022037) class.strategies (0.021118)
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Permission to reproduce these documents have been graciously provided by CSIR Building and Construction Technology. The assistance of the editors, Mr. Gustav Coetzee and Mr. Frances Boshoff, is gratefully appreciated.


Gowri K

Building codes and performance standards as knowledge-bases for design

Abstract: Code compliance checking is an integral part of the building design process. Many research attempts have been made to automate code compliance checking as a secondary task to developing a design solution.But it is possible to represent the code requirements in a knowledge base to assist in the design process. In the present study, a buildingenvelope design knowledge base has been developed to model the performance based design approach. The National Building Code of Canada's design requirements and an ASHRAE standard specifications for building envelope are incorporated in a knowledge base. A frame-based knowledge representation technique is used to implement the semantic relationships among the design context attributes. Once the performance attributes are established in the design context, then design altematives can be generated. A database of standard construction types for walls, roofs and glazings is developed to contain the material properties data required to generate design alternatives. This paper presents the knowledge acquisition and representation of building code and performance standards information, and also briefly describe the design process implemented in a prototype system.

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Full text: content.pdf (894,414 bytes) (available to registered users only)

Series: w78:1992 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.synthesis (0.054246) class.represent (0.011585) class.bestPractise (0.010128)
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Permission to reproduce these papers has been graciously provided by Research Press of the National Research Council of Canada. The support of the editor, Dr. Dana Vanier, is gratefully appreciated.


Ikeda M, Sekihara Y, Itoh N

Construction planning system for high-rise buildings using an object-based model

Abstract: Fujita Corporation, a leading general contractor in Japan, has sought to apply the products of CIC research to middle and high-rise buildings constructed using the PC (precast concrete) method. CIC activities focused on the development of a framework comprised of a family of products that share information for centering around 15-storied steel-frame reinforced concrete (SRC) buildings constructed using the HPC method . This output from the structural design process is manipulated further by other products that support construction planning and management.In this paper, we will explain in detail two products that were developed to generate a product model for buildings and to utilize this information for preliminary construction planning such as the crane selection ,evaluation of scheduling of this , and preliminary cost estimation . Lastly we state about present problem of this framework and a future direction of these systems.

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Full text: content.pdf (195,141 bytes) (available to registered users only)

Series: w78:1996 (browse)
Cluster: papers of the same cluster (result of machine made clusters)
Class: class.analysis (0.016127) class.roadmaps (0.009587) class.strategies (0.008387)
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Permission to reproduce these papers has been graciously provided by the University of Ljubljana. The assistance of the editor, Prof. Ziga Turk, is gratefully appreciated.


Jack C.P. Cheng and Mohit Mangal

Automated Optimization of Steel Reinforcement in RC Building Frames Using BIM and Hybrid GA

Abstract: Design of steel reinforcement is an important and necessary task for designing reinforced concrete (RC) structures. Currently, steel reinforcement design is performed manually or semi-automatically using computer software such as ETABS, with reference to building codes. These methods are time consuming and sometimes error-prone. With the aid of advanced BIM technology, steel reinforcement design could be automated for fast, economical and error-free procedures.This paper presents a BIM-based framework for automated optimization of steel reinforcement in RC building frame using developed three-stage hybrid genetic algorithm (GA). Optimization includes selection and alignment of steel reinforcement in RC building frame for the minimum steel reinforcement area, including longitudinal and shear/confinement steel reinforcement. The first and second stages optimize the longitudinal reinforcement while the final stage optimizes the shear/confinement steel reinforcement incorporating design code (BS8110) and buildability constraints. A three-storey RC building frame is analysed to check the applicability of the developed optimization framework and its improvement over current design approaches. The results show that the developed optimization framework can minimize the steel reinforcement area quickly. Automated 2D view of RC elements is then created to visualize the optimized steel reinforcement results.

Keywords: Building Information Modelling, Optimization, Interoperability, Steel Reinforcement Design, RC Frame

DOI: https://doi.org/10.24928/JC3-2017/0226

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