Applied Mechanics and Materials Vols. 638-640

Abstract: As the crucial junction in transportation lines, more attention should pay to the safety of bridges. However, the collapse of bridges under earthquake threats the safe of lifeline engineering seriously. Unseating prevention devices are the effective structural measure to prevent collapse under unexpected earthquake. The design of unseating prevention devices need not only to meet the deformation demand of bridge during normal operations, but also to limit the oversize displacement under unexpected earthquake. Combined with relational design standards at home and abroad, unseating prevention devices have been designed for bridge to prevent collapse. The research results show that the unseating prevention devices with reasonable parameter will decrease the relative displacement between superstructure and substructure, improve the seismic performance and integrality of bridge, and make the seismic load to be well-distributed among the piers.

Abstract: This article, based on detection and identification of a Industrial plant after fire, is to introduce the scene investigation contents and methods in detail through the analysis of test results to evaluate the damage on the structure, then to put forward comprehensive appropriate disposal suggestions, to provide reference for the detection and identification of construction after fire in future.

Abstract: Failure temperatures of composite cellular beams subject to a standard fire condition were investigated thoroughly by the Finite Element Method. A finite element model was developed for the fire performance analysis of composite cellular beams. Practical design guidance on the fire design of composite cellular beams is presented concerning the failure temperature.

Abstract: To study the difference between the reflected pressures of air shock wave on the rigid and flexible walls, the FE models of RC anti-blast wall and high-strength polyethylene fiber textile anti-blast wall were set up and the FSI solver of LS-DYNA was used to perform the numerical simulation. The TNT charge weight used in simulation is 5kg, 10kg, 15kg and 20kg, respectively. The peak reflected overpressures of air shock wave on the two kinds of walls were obtained. The variation of reflection coefficient of air shock wave on the anti-blast wall with scaled explosion distance and the wall stiffness was analyzed.

Abstract: The research targets at the transition zone from the southeastern margin of the Tibetan Plateau to the Sichuan Basin; it is shown according to field survey: from 2008 to 2010, debris flow occurred twice, resulting in missing of two people, destruction on a lot of farmland and other serious disasters. Such the debris flows were because that the original vegetation was severely damaged after “5.12” earthquake, a lot of loose blocks were scattered in slopes and valleys, and also stimulated by abundant rainfall during rainy season, local steep terrain, as well as narrow valleys. The paper makes qualitative and quantitative evaluation on risk of debris flow within the region by single-valley debris flow risk evaluation method as proposed by Liu Xilin and Tang Chuan et al. it is shown from the results that the risk level H is 0.55, within scope of moderate risk. In case of any adverse conditions, debris flows may occur again.

Abstract: Through the risk analysis on transport of bulk liquid dangerous goods in coastal waters, to explore measures of how to strengthen risk management of chemical accidents.

Abstract: The environmental deterioration of the subway station and the safety of the personnel evacuation under platform train fire are researched. The critical fire danger condition is proposed and the time calculation method of evacuation is determined. A platform train fire in a subway station is simulated by the Fire Dynamics Simulator software. Then the available egress time can be got by analyzing the fire temperature and smoke concentration change with time. At the same time, the required egress time is studied through theoretical analysis and computer simulation by software Building Exodus. The results showed that smoke exhaust rate is very important to the smoke control under platform train fire. And the stair evacuation ability is the key to the whole evacuation.

Abstract: This paper concerns the smoke control modes and the critical ventilation velocity when the subway tunnel on fires. The standard for the smoke control mode is making sure the smoke exhausting in the shortest way. The critical ventilation velocity means it is just sufficient to prevent the smoke spreading upstream. The critical velocity in different heat release rates obtained though theoretical analysis and computer simulation. In the end, a simple formula to calculate the critical velocity can be fitting out.

Abstract: This paper USES the probability analysis method, Markov model to predict fire personnel safety evacuation design rationality in public places. In a large public fire safety evacuation for example is analyzed, the results showed that: Markov model can be scientific, accurate and effective to predict the export flow density of the extreme cases within the limited time and emergency exit door set minimum traffic. In order to ensure the fire after the personnel to evacuate to the safe zone within the time allowed.

Abstract: Used the MarkovTRAIN model, a mining enterprises pneumoconiosis incidence trends is prediced. The result shows that the unit pneumoconiosis development quickly, must strengthen the dust prevention and control. Using LEC method to mine in the workplaces where harm worker healthy environments were evaluated and harm through improved LEC method for scientific management, and put forward effective countermeasures to control, for the prevention of occupational health hazards in mines and puts forward scientific basis for control.