Applied Mechanics and Materials Vols. 405-408

Abstract: All types of school buildings were seriously damaged in Taiwans 921 Chi-Chi earthquake. Seismic evaluation and retrofit of these numerous vulnerable school buildings has become an important issue to be resolved. The National Center for Research on Earthquake Engineering (NCREE), Taiwan assisted the Ministry of Education on the arrangement of programs to accelerate retrofit and rebuilding works of elementary school, junior high school, senior high school and vocational school buildings, as part of the project called, Economic Recovery Act. Based on the database for seismic assessments and retrofits of school buildings, this study recommends a seismic upgrading procedure of near-fault school buildings. The proposed procedure can control effectively the seismic upgrading progress of near-fault school buildings. It also provides suggestions on the seismic retrofitting and reconstruction plans of near-fault school buildings to reduce damages and losses in a possible seismic event.

Abstract: According to analyzing geological condition and failure pattern of constructing a 100m high waste dump on QIANYU abandoned tailing pond , It has predicted what disasters would be to villages and industrial buildings around after the waste dump is constructed. It has also determined corresponding preventive measures.

Abstract: According to the characteristics of geological disasters in highway high slope, rainfall and fissure deformation of rock mass are determined as major monitoring objects. Meanwhile, based on wireless communication technology, a hardware system for monitoring geological disasters in highway high slope, composed of rain gauge, displacement meter, data collection and transmission equipment and wireless early warning device, is established. Finally, based on network-based programming technology and SQL Server2005 database platform, a monitoring and early warning software for geological disasters in highway high slope, integrating all functions of sensing, transmitting, realizing and applying, is developed to achieve remote real-time monitoring, visualization management, data analysis and remote early warning.

Abstract: Fire overflow on exterior wall with thermal insulation system has been studied by numerical simulation. The spread laws of fire overflow are analyzed through the temperature distribution near the window. The computational results are compared with those of test in the Exterior Insulation Fire Barrier Technical Guidelines (EIFBTG). It has been found that the calculated maximum temperature points is closed to the test on the first floor, the first ceiling, and the points near the above two windows. However, there are differences between two kinds of results above two floors and ceilings, and the points near the first window. It has also shown that when the HHR is 7.5KW, the scope of damage of exterior thermal insulation layer is about 15 square meters near the window. The research would provide reference for fire protection design of exterior wall thermal insulation in the high-rise buildings.

Abstract: A new MRACO identification algorithm is proposed for structural multi-damage detection through combining MapReduce procedure and ACO method in this paper. Four classical benchmark functions are first employed to evaluate convergent performance of the MRACO algorithm, which pursues a global solution to combination optimal problem with constrained conditions. Then, a series of numerical simulations on constrained optimal problem about structural multi-damage detection of a two-story rigid frame have been conducted for assessing the applicability of the new MRACO algorithm applied to the structural damage detection field. Finally, some illustrated numerical results show that the MRACO algorithm can not only locate the structural multiple damages but also effectively quantify the severity of damages with higher accuracy and good noise immunity.

Abstract: Deformation analysis and prediction is a multidisciplinary important research topic. Considering that fuzzy theory has been widely used in prediction methods and models fields at present,the paper introduces fuzzy time series to deformation analysis and prediction. In this paper,the modeling steps of fuzzy time series are briefly introduced and experimental results show that fuzzy time series can be effectively applied to deformation analysis and prediction and improve the accuracy of prediction.

Abstract: The dam reinforcement and rehabilitation of dangerous reservoirs is a long-term and an arduous task in China. The reinforced and reinforcing reservoirs have been investigated from the statistics of historical accidents, the sickness and danger severity assessment situation at present. The sickness and danger severity comprehensive assessment technology is to appraise the severity of sickness and danger of a detective reservoir dam, to provide technical support in the decision-making process on whether danger removal and consolidation should be performed and what work sequence and method should be adopted in this work. It is a technology in urgent demand in China for rehabilitation and consolidation of reservoirs with sickness and danger, which will provide the technical support for the dam reinforcement decision-making and safety management.

Abstract: A 2D numerical model based on Boltzmann equation and an unstructured FVM grid with a kinetic flux vector splitting (KFVS) scheme was developed to simulate dam break-wave. As an example, propagation of the dam-break wave of one reservoir dam at Yuhang District of Hangzhou in Hangzhou was simulated by this model. Using regional economy, population, and geography data of 2008, the economic loss caused by dam failure was evaluated. The result shows that total economic loss is about 20% of the GDP in Yuhang, which is close to the conclusion of some existing researches. It is foreseeable that this method would to be used more widely in Zhejiang for dam safety management.

Abstract: A hybrid prediction model based on the simulation of the complete process in high arch dams is proposed because of capacity shortage in the prediction of and early warning for deformation and stress in such dams during the first impounding stage. An early warning system for dam body deformation as well as dam heel and dam toe stress is established in this model. The warning thresholds are also clarified. Applications in the first impounding stage of the Xiaowan Arch Dam show that the model is practical and effective, and can provide highly accurate predictions. Early warning indicator thresholds for deformation and stress are reasonably set to provide warnings for abnormal situations. The model provides accurate predictions and effective warning methods for the safe impounding and operation of high arch dams.

Abstract: t was well known to the world that the dams were critical construction measures to regulate and control water resources, optimize the water distribution, and the important component of flood-prevention system. For the sake of providing beneficial basis for the study on monitoring of dam security, we summarized the research status of dam security monitoring from 3 aspects: the connotation, impact factors and development tendency. Combining with our practical experiences, the recommendations on dam security monitoring were suggested in this paper: (1) Automation, digitization and integration were the final development tendency of dam security monitoring; (2) Basic study should be combined with apply study, and the basic study need to serve apply study; (3) Basic studies need to pay much emphasis on the Reference from multi-fields, applying excellent study achievements from other fields to the monitoring of dam security, such as mathematics and computer fields; (4) New devices such as 3-d laser scanner should be popularized, and the costs of related elements should be decreased. Moreover, related equipments which could improve the monitoring precision need to be input more human and material resources in the R&D process, in order to increase the reliability of monitoring results.