Advanced Materials Research Vols. 919-921

Abstract: Concrete carbonation resistance is an important embodiment of concrete durability. This article takes National Road 209 line the Shibi Mountain Bridge as the research object. A series of carbonation experiments were did to test the concrete durability. The results show that: under a certain mixing radio, the concrete of T beams, bridge deck, pad stone and thin-walled pier taken from the Shibi Mountain Bridge, which was added admixtures, has a less carbonation depth. According to the theoretical calculations, protective layer resists the carbonation erosion effectively which gives a good protection on steel reinforcement.

Abstract: In recent years, the demand of the crude oil is increasing in the world, and the oil storage tanks are also developing larger and larger. Higher requirements of safety for storage tank, especially safety evaluation of the oil tanks in fire environment, was proposed because the oil tank volume is large, as well the oil is volatile, flowing, inflammable and explosive easily. In the paper, the fire process was simulated by the heat treatment for the key position, and the relationship between mechanical property and heating temperature of large tank after fire was obtained. The strength evaluation for large-scale crude oil storage tank after fire was implemented and the result showed that the strength for large crude oil tank was satisfied with requirement.

Abstract: In order to grasp how the sectional sizing optimum design imposes effect on the global stability of latticed shell, with an example of K6 single-layer reticulated shell whose span is 60 meters and vector height is 6 meters, the impact of different ways in rods grouping and valuing sectional size on bars buckling discipline and mechanical performance was analyzed. Factors like the strength and slenderness ratio of members, local and overall stability of structure are entirely taken into account to guarantee the accuracy of the analysis results. The results show that optimum design of sectional sizing on single-layer latticed shell can reduce the steel consumption, change the buckling discipline and improve the ultimate stable bearing capacity of structure, but simultaneously it would bring about a smaller deformation, and no significant early warning of damage comes up when structural instability failure occurs.

Abstract: A proposed residential district intend to be built in some coal mine subsidence area . Surface deformation influence main components forces of the building is a complex change process. Using the finite element software ANSYS to analyse the main components of the proposed buildings. Analysing main components' internal force relatively change of the first floor under the surface deformation than without surfaced formation. The result reveal that under large surface deformation, the internal force of beam and column changed largely .Beam force increase significantly in excess of 100%, column force increased significantly in excess of 500%. Then analyse-1-3 layer component force changes largely. Residual deformation greatest impact is the underground floor and 1st floor, and then is 2 and 3layer. This study could provide certain design reference for using the subsidence area of Shanxi.

Abstract: Explosion experiment was implemented on the small tailings dam model, aims to study the explosion effect of tailings sand under the action of the explosion. Explosion experiment includes three phases; experimental points were set respectively in the starter dam, embankment and deposited beach. In this experiment, blasting vibration velocity and vertical displacement of sand body are measured and collected, so did the tailings sand’s moisture content, cracks’ size, blasting crater, water and sand spurt phenomenon. Experimental results show that the buried conditions and tailings dam’s moisture content have a significant impact on explosion effect. By processing the velocity and displacement data, the attenuation law of blast vibration velocity in the tailings dam is reached, the blasting vibration velocity corresponding to crack damage of sand body is predicted, and the relationship between failure phenomenon of the tailings dam and the displacement produced by explosion is obtained.

Abstract: fire resistance model of reinforced concrete column was built by ABAQUS, and the model was validated with experiment. Temperature field and fire resistance of reinforced concrete column exposed to fire with heating and cooling phase was analyzed. The results show that Temperature field of reinforced concrete column would elevate when the environment temperature descended, and deformation and internal forces became more severity.

Abstract: The paper addresses the issues of fire behavior of masonry walls made of traditional/historical component materials (bricks and mortar).There are reasons for coupling investigations on the residual mechanical properties to fire resistance data, aiming at a more complete knowledge of the behavior of a masonry member during and after fire exposure. The paper proposes a numerical approach via FEM to the problem of residual mechanical performance of load-bearing fire-separating masonry walls after insulation failure. The goal is to establish relationships between fire resistance ratings under exposure and decay in mechanical properties after exposure; the parameter of wall thickness is especially investigated. This is performed by means of FEM analysis, simulating a standard ISO 834 fire resistance test followed by a mechanical compressive failure test on each investigated type of wall. First, a preliminary transient heat flow analysis gives a numerical prediction of fire resistance after violation of I (Insulation) criterion; then, a staggered heat flow - stress analysis repeats the heating of the wall up to insulation failure and calculates the thermal strain accounting for cracking; finally, a 'cold' structural analysis in compression is performed on the thermally-deformed model after cooling. The comparison of numerical outcomes to available experimental information allows to judge the reliability of the numerical approach in reproducing the residual behavior of a masonry wall after fire exposure.

Abstract: As the leading of oil and gas exploration and development, oil-gas drilling operations with high investment, high technology, and other industries interchange and perennial wild characteristics, there are various HSE risks during operation. Constructing HSE risk assessment system of oil-gas drilling operations, using AHP to construct indicators were analyzed and compared, and calculate the index weight. Then build fuzzy evaluation matrix based on expert evaluation method, get fuzzy evaluation result is "high risk". Finally, from four aspects (people, object, environment, and management) proposed HSE control measures.

Abstract: Ignition temperatures of common radiation cargo in irradiation room were measured through the experiment, minimum ignition temperature is 210 °C. In order to discuss the temperature variation under stuck radioactive sources, two fire scenarios were presented and simulated by FDS. The results show that temperatures rise rapidly when stuck radioactive sources broke out within an hour. As the growth of the time, temperatures in irradiation room are rising, but the rising rate is slowing. In fire scenario A and B, the incidents of stuck radioactive sources occur in 9 days, 4 days later, local temperatures can reach 210 °C, and radiation cargo may be ignited. The results of the research can provide reference for fire risk judgment and assessment in irradiation room.

Abstract: The typical ⁶⁰Co round irradiation room of stacking has been taken as a research subject. Ignition temperatures of common radiation cargo were measured through the experiments, minimum ignition temperature is 210 °C. In order to discuss the temperature variation and temperature field under stuck radioactive sources, the fire scenario was presented and simulated by FDS. The results show that temperatures rise rapidly when stuck radioactive source broke out within an hour. As the growth of the time, temperatures in irradiation room are rising, but the rising rate is slowing. The temperature field in the irradiation room tends to be the same after two hours. The stuck radioactive source occurred after 7.2 days later, local temperatures can reach 210 °C, and radiation cargo may be ignited.