Advanced Materials Research Vols. 446-449

Abstract: Air cooled thermal power structure is composed of spatial steel truss and steel-concrete tubular columns. Permeable “A” shape structure and wind-break wall are installed on its top. The wind load in the wind-break wall has great effect on its lower part. The structural wind parameters is not clearly stipulated in current load code. To solve the problems of wind parameter value in design and effectively evaluate the influence on wind-break wall form to the structural wind-resistant properties, three different wind-break wall forms are presented. Wind properties on an actual air cooled thermal power structure under three different wind–break wall forms are simulated with FLUENT software. Wind pressure law on “A” type structure and wind-break wall under different wind-break wall forms and at different wind direction angles is studied. Every division section shape coefficient of wind-break wall and “A” type structure under different conditions is obtained. The wind presure distribution law and the most reasonable wind-break wall form is obtained.

Abstract: With the increase in depth of coal mining, coal mines constructed are constructing some industrial building of new type in order to improving word condition and increasing utilization of energy. E.g. deep vertical Shaft Carries water chilled to decreasing hyperthermia harm of coal face, the methane is used by steel pipe drainage from deep coal area. Steel pipe’s instability under radial pressure lead to failure during deep shaft construction, calculative method applied isn’t perfect. Critical force of stability is analyzed by theoretical analysis、experimental research and numerical simulation, conclusions can be used for designing as a reference.

Abstract: Based on the SCR process, semisolid shearing-rolling process was proposed. Effect of strip size on neutral angle during the process was analyzed. Neutral angle decreases gradually with the increment of the strip width. When the strip width is less than 40 mm, the neutral angle decreases more obviously with the increment of the strip width. When the strip width is greater than 40 mm, the neutral angle decreases slowly with the increment of the strip width. The neutral angle decreases gradually with the decrease of the strip thickness. Neutral angle is mainly affected by the strip thickness.

Abstract: Humans realised the importance of housing since the dawn of history. The first man used the caves as shelter. When agricultural activities dominated the life style of humans, villages started to be constructed. Later these were developed into cities. The dawn of civilization started in Iraq. The inhabitants in that time used the available natural materials in their construction. Reviewing the progress of engineering practices of ancient Iraq, reveals the facts that the inhabitants were aware of the principles of construction and engineering. The materials used and the design of the buildings were very suitable from both environmental and engineering perspectives. This work is a critical review of the progress and development of engineering practices and construction materials used in ancient Mesopotamia

Abstract: Compared with middle-span bridges, seismic response of long-span bridges is more complicated, and so is seismic design. For example, influence of high order modes is obvious, as well as multi-support excitation, all kinds of nonlinear factors and soil and structure interaction (SSI). It is necessary to study on seismic behavior of a long-span continuous girder bridge. With the help of shake table array and substructure test technology, study on seismic performance of a long-span continuous girder bridge has been done and some useful conclusions have been got.

Abstract: A composite FRP volleyball upright structure is analyzed by finite element (FE) method. A static analysis is performed using commercial finite element software ANSYS. Deformation and stress distributions under regular and upper bound force (i.e., to include dynamic/impact effect) are provided. An elastic eigenvalue analysis is carried out as well to predict the buckling load and modes.

Abstract: Structure monitoring has been increasingly valuable in recent years and has taken a leading role in the field of structural engineering. Date collected by early age monitoring represent a unique source of information for understanding the real behavior. In this paper, the temperatures evolution and concrete deformation evolution are obtained by real-time continuous monitoring of Reinforcement concrete(RC) wall. The result shows that the early age thermal cracking is one of the most important origin of several phenomena that imperil durability and shorten the lifespan of the structure. Though the wall is not considered as mass concrete, and has a big radiating surface, the maximum temperature can even reach up to 52°C due to heat generation of cement and the insulation of formwork, which can lead to shrinkage deformation when the temperature decreases. The measured experimental date can provide useful reference for early crack control and durability of RC concrete structure, and they can also be use to verify and improve the accuracy of the numerical results for RC wall, which is available in the future for basis to similar projects and research.

Abstract: The effects of creep and shrinkage of concrete is non-ignorable to strength of steel and concrete composite beams under sustained load, and the relative slippage should be considered for internal force. Time-dependent modulus method is presented, formulas of the stress and strain at any time are deduced considering creep, shrinkage and the relative slippage. The variational stress is analysed of the steel and concrete composite beams under sustained load.

Abstract: The technology of Reinforced soil has been widely used in civil engineering, its theory has some development . However, there is nearly any study about the theory of Geogrid-reinforced fly ash .In this paper, study the interface characteristics between fly ash and geogrid through the pull-out test,reach the following conclusions:the size of normal stress and water impact the interface parameters between the geogrid and fly ash;the interface friction coefficient between Geogrid and fly ash is small,adding gravel to fly ash can improve the interface friction coefficient between geogrid and fly ash.

Abstract: Based on the low cyclic reversed lateral loading tests of shear wall thermal insulation brick wall on build by laying bricks, shale brick masonry wall thermal insulation of the failure pattern, deformation and stability and seismic performance ability and shear wall deformation, the seismic performance were analyzed. The results of the study show that the shale hollow brick wall insulation bricks with a good seismic performance stability. If vertical slits were set properly, the transformative property of the shear wall was improved greatly and the seismic behavior was excellent under the condition that the bearing capacity decreased slightly.