Applied Mechanics and Materials Vols. 353-356

Abstract: Combined with the typical prestressed concrete continuous-beam bridge with 17m+28m+17m span over the main channel of the Central Line of South-to-north Water Transfer Project, two finite element models of this bridge, one considering and another without considering the pile-soil action, were built by the specialist bridge analysis software MIDAS/Civil 2011. The main vibration mode and its frequency were calculated by the self-vibration analysis, and the seismic response of the bridge was given out by the SRSS method of response spectrum method. Based on the calculations, the effect of pile-soil action on the dynamic characteristics and seismic behaviors of the bridge was studied. The results show that the pile-soil action brought the bridge structure into flexible, which led to the smaller vibration frequency but had no influence on the top two vibration modes. It also led to the larger displacement at top of piers and midspan of continuous-beam and the smaller internal forces of brake pear under the seismic action.

Abstract: In recent years, frequent waste dump landslides brought the huge losses. Now, there is no mature theory system about the research on waste dump stability, this paper puts forward a disaster evaluation method for waste dump landslide which bases on fuzzy mathematics principle, the evaluation method is convenient and practical. Firstly, we established evaluation indicator system on the basis of analyzing landslide influence factors; first grade evaluation indicators included engineering geology, hydrogeology, dumping process and other factors; second grade evaluation indicators included geotechnical properties, foundation soft rock, foundation slope, atmospheric precipitation, underground drainage, drainage facilities, dumping way, dumping order, propulsion speed, mining disorderly, blasting vibration and force majeure. Secondly, we used analytic hierarchy process (AHP) to determine the indicator weight. At last, combining with the actual situation of some waste dump and using fuzzy mathematical theory, we had the safety evaluation to waste dump landslides, the result is in good agreement with the actual situation and shows that the method is a scientific guidance to the safety management of the waste dump.

Abstract: Damage of disaster to residents can be mitigated by urgent refuge. But the old way to plan urgent refuge is not reasonable. So techniques and methods are needed. Geographic Information System (short for GIS) as a new technique and method is of some import to planning urgent refuge. Calculating the impact of factors in each raster, distribution maps of Euclidean distance is got. Then, the maps of factor which get different weight index are calculated by overlay way. The last map is as planning urgent refuge. After that, the way is used in a country as a test application. The result shows that the way based on GIS makes planning urgent refuge more scientific and more reasonable. Planning the country urgent refuge proposed is worthy to use for reference.

Abstract: From the perspective of architecture, this paper discusses the disaster-prevention strategies for existing urban high-rise housing. Through an analysis of architectural space, architectural structure, and building materials of existing high-rise housing, the paper puts forward disaster-prevention strategies with the purpose of reducing and alleviating casualty loss, and ensuring effective evacuation of residents.

Abstract: During lifetime of a bridge, it may be subjected to many hazards, in which one of the most severe hazards is fire. In recent years, due to rapid development of transportation systems, as well as increasing transport of hazardous materials, bridge fires have become a concern. Bridge fires caused by crashing of vehicles and burning of gasoline are much more severe than building fires and are characterized by a fast heating rate and a higher peak temperature which could lead to bridge collapse. Bridge failures during a fire can result in the disruption of commerce and services, and most importantly the loss of human life. This paper presents an overview of bridge fire incidents, provides a state-ofthe-art review of studies on bridges in fire, and identifies the research needs in the future for protecting critical bridge structures.

Abstract: Storm cause deformation and collapse of structure, endanger people's life and property security. In order to avoid or reduce the impact of wind load effectively, the paper mainly introduce wind tunnel test, numerical wind tunnel method, time domain analysis, frequency domain analysis and the research and application of domestic scholars.

Abstract: Scientific accident emergency precaution can reduce the frequency and the level of mining accidents. In this paper, mine hazard sources reassessment, coal mine system reliability analysis, damage and lost estimate were proposed as basement of accident early warning, and the calculation methods were discussed furthermore. Then a three-tire architecture designed management system of accident was constructed ,which can provide reference information for supervisory control and contingency plan.

Abstract: According to the international standard, main problems lying in the process of hazardous zone classification were emphatically analyzed. The source of release was determined in light of its release frequency and duration, namely the continuous source, primary source and secondary source. Considering the effect of release rate, LEL, density, ventilation, obstacles, and meteorological conditions on the classification of the hazardous area, it could be found that the hazardous zone would expand as the release rate increased with lower explosion limit. The gas that was heavier than air covered larger hazardous areas than the lighter gas. Besides, ventilation might speed up the diffusion so as to reduce the scope the hazardous zone; obstacles prevented the diffusion so that concentration of partial gas increased and then the danger level increased; wind at high speed quickened the diffusion to decrease the range of dangerous area. Finally, explosion-proof electrical equipment was selected rationally according to the type of explosive gas and temperature group.

Abstract: The large-scale atmospheric circulations and anomalies have been shown to have asignificant impact on seasonal weather over many parts of the world including Malaysia. Malaysia is located in the South East Asia with Southwest and Northeast Monsoons, experiences numerous flooding from year 1926 to 2012.Flood has become a regular disaster in Malaysia which happens every year in different states especially during the northeast monsoon. In December 2006 and January 2007, the Northeast Monsoon brought heavy rain through series of continuous extreme storms that caused devastating floods in the southern region of Peninsular Malaysia particularly to Kota Tinggi, Johor. The storms had occurred in two separate phases in late December 2006 and early January 2007 with atotal precipitation in four days exceeding twice of the monthly rainfall in which some places recorded a higher number. Johor River originates from Mt. Gemuruh and flows through the southeastern part of Johor and finally into the Straits of Johor. The 2006 average rainfall return period is 50-years while the 2007 gives more than 100-years return period. The objective of this study is to perform a flood simulation of the river basin using InfoWorks RS. The rainfall and stream flow data have been used as the hydrological input for the model. There are over 140 nodes representing the cross section throughout the length of the river. From the study, the main finding from the flood mapping process is that the simulated flood depth and flood risk map. Comparison between the simulated flood depth and observed flood depth has been done and shown a reasonable agreement.

Abstract: With global warming and sea level rising, the frequency and intensity of typhoon-rainstorm induced disasters have been increasing. The infrastructures in typhoon-rainstorm prone area are menaced by natural hazards. This paper aimed to compare the risk level for infrastructures designed by China design code and by our proposed Multivariate Compound Extreme Value Distribution (MCEVD) model. Risk assessment of some important infrastructures in typhoon-rainstorm prone areas are performed using MCEVD as follows: disaster prevention design water level for estuarine city Shanghai and design flood volume for Three Gorges Dam (TGD).The calculation results show that risk assessment based on MCEVD is a reasonable method for engineering planning, design, construction and management.