Advanced Materials Research Vols. 250-253

Abstract: In this paper, full-scale experiments had been designed and implemented in wind tunnel to simulate the corridor fire. A combination model with smoke buffer and other smoke-control modes was established on the base of experiment, and Fire Dynamic Simulation (FDS) was applied to simulate fire in the same conditions. The results reflected that the model is reasonable and viable by compared the simulation results and the experiment dates and the error of the average temperature is about 4.08%. Experimental studies also show that in those modes one smoke outlet is needed every 30m and it is better to set near the ignition source. Its exhaust efficiency is 72.1%, better than others; additionally it needs to put up smoke screen to strengthen the smoke exhaust effect. Thus the best combination with smoke-control is perfect in corridor.

Abstract: Based on the research on the frost resistance durability of Elastocoast® PUR-stone, this thesis provides a comparison and analysis of the flexural strength, compression strength and quality loss of Elastocoast® PUR-stone after 300 times freeze-thaw cycling, concluding that reduction in both flexural strength and compression strength occurs after 300 times freeze-thaw cycling of Elastocoast® PUR-stone while no distinctive change in quality loss is observed, which testifies to a certain degree of freeze-thaw resistance of the material.

Abstract: Tests on rolling technology of four-graded RCC were carried out on dam site and then recommended construction parameters of four-graded RCC was proposed, which aimed to provide technique support for application of four-graded RCC in hydropower projects. Results show that when water consumption is 71kg/m³ and VC value is 3s~5s of four-graded RCC, large aggregates are coated with mortar sufficiently and the mixture has good performance of being-rolled and anti-separation. Recommended parameters of four-graded RCC are as follows: 2 times without vibration＋6 times with vibration＋2 times without vibration for 0.4m-thick layer, 2 times without vibration＋8 times with vibration＋2 times without vibration for 0.5m-thick layer, with rolling exciting force 395kN and walking speed 1.0~1.5km/h. Then the relative compaction of four-graded RCC can reach or exceed 98.0%.

Abstract: In order to understand the contact condition of longitudinal joint of gravity dam and its influence on dam body stress, taking a concrete gravity dam section as the research object, the numerical simulations with 3D nonlinear FEM is carried out through the simulating of the construction period, the grouting process and the operation period. It shows that the opening of the longitudinal joint varies with many kinds of factors, such as the year temperature, water cooling, water load on the upstream surface, the construction process and so on. Under the present condition, secondary grouting to the longitudinal joint may not be carried temporarily. The computation results are basically in agreement with the prototype monitoring data.

Abstract: Vegetation evaporation is believed to be an important control measure in heat-island mitigation. The impact of vegetation on mitigating heat island intensity in four major cities in China is investigated using a numerical method. The simulation results show that increasing vegetation cover can significantly reduce outdoor air temperature in summer in the four cities investigated. However, the evaporation rates of plant and magnitude of temperature decreases are different in the four cities because different climate characters.

Abstract: The conflict between urban plan and land use plan is an intricate problem. This paper will take Yicheng City as an example to analyze the cause of conflict between urban plan and land use plan. Then quantitatively study on the coordination between urban plan and land use plan based on GIS technology and provide a practical working route and technology method for the coordination of these two plans. Because of the promotion of working route and technology method, it achieves good effect on these two plan’s coordination process.

Abstract: Geographic Information System (GIS) has been widely applied to the field of pest management, which provides the new ways and methods for integrated pest research, prevention and control. The main purpose of this study is to forecast and manage forest pests and diseases. For this purpose, I developed the forest pests diseases forecast system, by using ArcObjects (AO) and Visual Basic as the secondary development platform. The system is able to synthetically analyze and judge relevant data, such as weather forecast and tree species, according to the occurrence laws of the forest pests and diseases and the characteristics of biology. The system uses Markov chain and other methods to forecast the occurrence period, amount, scope and the degree of harm of pests and diseases. To validate the reliability of Markov chain model, the pests and diseases data of Liu'an City of Anhui Province, in China from 1975 to 2001, to be applied. The results show that the method used is reliable. The occurrence area and location of forest pests and diseases can be labelled and displayed on the electronic map with three-dimension.

Abstract: The Klang River originates from the northern part of Selangor, drains the Klang Valley, and finally discharges itself into the Straits of Malacca, approximately 120 km away from the upstream point. As the state of Selangor and the city of Kuala Lumpur are going through tremendous development, the river is subjected to pollution from point and non-point sources. The pollution sources may come from urban activities, agricultural activities, industrial and commercial activities, and residential areas. In addition to this, the pollution loading from non-point sources is usually difficult to estimate because it is a function of rainfall/storm water runoff. The purpose of this research is to set-up a digitized model of the Klang Valley river basin to study the effect of development on the river basin by using computer modeling. In this paper, the used of GIS technique in determining the spatial variability in river basin has been explored. Based on the GIS technique, the DEM of the study basin was used to delineate the stream network and extract information of catchments characteristics. The locations of the point and non-point sources were surveyed and digitized spatially along the river basin. These are important as it will serve as a database before the water quality simulation can be performed. The developed model can also be extended to a larger basin. Field survey and further investigations would be helpful in calibrating the critical parameters and thus improving performance of the developed model.

Abstract: Based on the characteristic of cooler frame, the finite element model of air cooler frame is established using ANSYS software. Equivalent static load method and response spectrum method were used for the seismic performance analysis of cooler frame. The equivalent static load is applied at the center of gravity of various masses using MPC184 rigid beam for transferring the load. The deformation and stress of cooler using equivalent static load method are larger than that of cooler using spectrum response method. For this reason, it can be said that the equivalent static load method is more conservative. At last the deformations and stresses of cooler frame using two methods are checked by ASME AG-1 specification. The results showed that the deformation and stress of cooler frame meet the requirements.

Abstract: Dynamic consolidation has been widely used in many engineering fields. But in the use of discarded iron slag filled embankment, because the discarded iron slag is naturally piled up, multi-size particle mixture and backfilling height is relatively high, the effect of simple dynamic compaction is not obvious. This paper, combined with engineering examples, through the dynamic consolidation test, describes the experimental program, arrangement and spacing of tamping point, and matters need to be taken care in construction. It also explains the horizontal effects in consolidation by detection data analysis of waste iron slag roadbed. In this paper, we have established finite element numerical simulation analysis of dynamic consolidation by using FLAC3D. It is available in roadbed practical application and can be reference in similar projects of dynamic consolidation.