Applied Mechanics and Materials Vols. 166-169

Abstract: According to the characteristics of lahar deposit, 9 important influence factors of lahar deposition are selected, which are stratigraphic age, lithology, weathering degree, accumulation thickness, elevation, relative height, longitudinal gradient, vegetation type and vegetation coverage. The subjective and objective weights are obtained respectively by Valued Iteration Multi-Expert Determination and Rough Set. Synthesis weights are acquired by combining subjective and objective weights. Influence factors are divided into four levels. The four levels are given 1-4 points respectively, according to a certain division standard. Classification zoning maps of 9 influence factors were obtained respectively by field investigation, data collection, remote sensing, numerical calculation and DEM model calculation. The risk level division map of Changbai Mountain region is eventually obtained through stack analyzing by GIS, according to the synthesis risk degree. Synthesis risk degree is acquired by combining the influence value of each factor and their synthesis weights.

Abstract: Three cross-shaped columns were tested under low cyclic loading in order to research the effect of stirrup ratio on seismic behavior of cross-shaped columns with HRB500 reinforcement. The damage characteristic, hysteretic curve, load, displacement, ductility and accumulated damage were analyzed. The result show the damage characteristic is improved, the hysteretic performance has great improvement and the ductility of cross-shaped columns is enhanced with the increase of volume stirrup ratio. Besides, the degree of accumulated damage of specially shaped columns with HRB500 reinforcement can also be lighten.

Abstract: This paper proposes a hybrid evaluation approach combining fuzzy comprehensive assessment method and AHP that measures the safety performance of construction site. The weight of each index was calculated through AHP model which use in fuzzy comprehensive assessment, and then the safety level of construction sites was determined by multi-layer fuzzy comprehensive assessment technique. In order to find out the main causes of safety level of construction site’ changes, the grey correlation analysis was used to quantify the influence degree of each factor of safety level of construction site. The effectiveness of our methodology was verified with an empirical study by using the data of 3 construction sites we investigated. The results show that this approach can be an effective tool to predict the safety performance of construction projects sites, which is useful to provide a scientific basis for the management and decisions of accident prevention.

Abstract: Treatment and disposal of sludge has been identified as a large problem in environmental science. Using explosion shockwave can destroy sludge (moisure content greater than 95%) colliod structure and improve sludge dewaterability and anaerobic digestion, it plays important role in dealing with this problem. Overpressure in sludge and wall strain of spherical explosive vessel were investigated, usefull overpressure and strain law were obtained. The research results provide effective information for sludge treatment and safty assessment of explosion vessel, and to design large-scale experiments by similarity theory.

Abstract: With the spread of terrorism all over the world, many buildings become targets of attacks. Glass will break easily under explosion load, therefore improve the anti-explosion performance of architectural glass can effectively reduce the damage caused by bomb attacks. Nowadays domestic study mainly focus on material performance, seismic resistance, construction design of architectural glass, but the study of glass’s anti-explosion performance is still in the preliminary stage, and there is also no anti-explosion design standard for architectural glass. Research of blast experiment for framed glass was made combining with shock wave, explosion load destruction effect, dynamic property of glass. float glass was used for the experiment, and finally the method to ensure safe extent of framed glass under a small priming charge explosion was put forward.

Abstract: As a main parameter reflecting the security status of slope, internal displacement monitoring has been an important issue to geotechnical engineering. An optical inclinometer is demonstrated, which utilizes FBG sensors attached to the casing of a conventional inclinometer. Three arrays of sensors at an interval of 90 degrees are glued to the outside of inclinometer. The authors carried out model experiment, in which characterization of the sensor revealed good agreement with theory and conventional displacement measurements. Meanwhile, angle monitoring result was rewarding, monitoring value of 44.3 and 29.5 degrees corresponding to the actual value of 45 and 30 degrees respectively.

Abstract: In China, flooding is one of the most common and frequent natural disasters, which can cause life and property losses partly due to heavily damage and collapse of rural buildings. Hence, it is very important to conduct comprehensive study on flood damage to rural buildings. In this paper, the flood damage to rural builds is described and analyzed with emphasis on the foundation scour, which may result in whole building collapse, and scour protection strategy. Damages or collapse caused by foundation scour of rural building can be categorized into two main groups according to the location of rural a building. After summarizing existing scour protection strategies, a new technology is suggested. The contents presented in this paper may be useful references for further study on flood damage to rural building and scour protection engineering practices.

Abstract: 3-dimensional (3D) city model is increasingly popular in urban planning and disaster management. City Geographic Markup Language (CityGML) is an open data model and XML-based format for the representation and exchange of virtual 3D city model. This paper analyzed the modeling mechanism of 3D CityGML building model in LOD4 (Level of Detail) and proposed a method representing a fire event in CityGML. Our method included three operations：1) editing of building’s hierarchy and attributes information; 2) representing of semantic information of buildings surfaces, roof height and interior furniture; 3) representing of fire event by a vivid icon. With our method, 3D building model and indoor fire event can be both represented in CityGML, which is important to analyses urban emergency events.

Abstract: In a city like Shanghai, where large sum of existing buildings with lots of existed hidden safety trouble exists, the need to identify and solve the safety problem of the existing Buildings to ensure the safety of the citizens’ lives and properties has become a vital task. This research concluded the several types of the hidden safety trouble for the existing Buildings including the main structure trouble, the fire trouble and some other trouble. Also the corresponding measures have been presented including the short term measure and long term measure. The results revealed that short and long term measures should be both used at the same time and the short term measures should transform to the long term measure gradually.

Abstract: The detention pond and the retention pond are effective means for flood control. In this paper, two different storm runoff processes, used the detention pond and the retention pond, were simulated by SWMM. Through analyzing the results, the detention pond and the retention pond can control the flood obviously. Furthermore, the action effects of detention pond and the retention pond were discussed. In the end, the paper put forwards that the suitable flood control measures should be chosen by regional hydrology characteristics, maximum permitted discharge of downstream, engineering economics and so on.