Advanced Materials Research Vols. 250-253

Abstract: In this paper, a biconical tapered fiber sensor is applied to monitor the temperature of cement paste during curing process. A simple sensing principle of the proposed sensor is presented by analyzing the V-number of leaky rays. An experimental is carried out by tapering the plastic multi-mode step-index fiber to measure the temperature of the cement paste. The numerical result shows that the V-number of leaky ray is increasing with the raised in temperature. The experimental results are in agreement with the results from the theoretical analysis.

Abstract: There are more than 100 lakes in the central districts of Wuhan, which can be listed as the top one in China. Although Wuhan is gifted with such natural resources, it is still ruined by some personal factors such as soil and water losses and urban expansion in lakeshore areas. In recent years, lake areas decreases, wild species are driven away because of the damage and solidification of lands, and lakes in Wuhan are facing unexpected great challenges. The thesis will employ ecological grid analysis and mathematics statistics analysis to make a research on the pattern of lakeshore land use in different years, and summarize principles for its evolution.

Abstract: Shield tunneling may have negative influence on the nearby facilities. Especially, it will cause the additional stresses and moments along the pile shaft. If the stresses and deformation of a pile exceed the allowable values, that will affect its normal use and even result in its damage. Therefore, base on a practical engineering in Shanghai, some factors such as the distances between a pile and a tunnel, the concrete strength of a pile are investigated using finite diffrence method. The results show: the degree of disturbing soil in two sides of the tunnel is greater than that of soil in front of the tunnel; shield tunneling has a strong effect on a pile within a distance of 3m between the pile and the shield machine; however, if the distance is in excess of 3m, the effect is not too strong. Furthermore, the grade concrete strength of a pile has little effect on the pile behavior. This conclusion has some reference value to the actual project.

Abstract: As a new construction material, fiber reinforced polymeric plastic structural shapes are readily available. Therefore, new construction and existing structure rehabilitation using FRP materials are ever increasing trend because of FRP material’s chemical and mechanical properties compared with those of conventional construction materials such as steel and concrete. Among the structural composites, pultruded fiber reinforced polymeric plastic structural members are the most popular for the civil engineering applications because of the cost effectiveness. However, they are made of fiber reinforced polymer resin system, they have relatively low modulus of elasticity and also cross-sections of structural shapes are composed of thin plate components such as flange and web. Therefore, structural stability is an important issue in the design of pultruded structural members. For the design of pultruded structural member under compression, buckling and post-buckling strengths of plate components may be taken into account. In the structural steel design following AISC/LRFD, in addition to the buckling strength, the nonuniform stress distribution in the section is incorporated with a form factor. In this paper, the form factor for the design of pultruded structural member under compression is investigated by experiment. Based on the experimental results, the form factor for the design of pultruded structural shapes have been suggested.

Abstract: This paper presents a preliminary finite element study on the effects of strain rate on the FRP-to-concrete bond behaviour using the K&C concrete damage model in LS-DYNA Explicit. The developed FE model uses the first-order eight-node hexahedron 3D solid element with one integration point and a sub-millimetre mesh. Results show that the model can simulate the static FRP-to-concrete bond behaviour with good accuracy and mesh objectivity. It also shows that the loading rate has significant effects on the bond behaviour.

Abstract: The paper presents construction performance comparison of curtain wall operations. It is well known that curtain wall operations are major parts of high-rise construction projects. Literature reviews of high-rise buildings and curtain wall operations lead the study to focus on a unit system which has been widely applied in the domestic high-rise curtain wall construction. Data was collected by recording in actual curtain wall construction sites and simulation model was implemented for the quantitative comparison between the simulation value and the value of actual curtain wall construction sites. It is expected that this proposed study contributes to the further studies of developing an optimized assembling process model for engineers and site personnel in construction.

Abstract: Lots of “problematical piles” have been discovered during inspection of core-pulling to cement mixing piles, and the layout of the problematical piles are not uniform. Emergence of the problematical piles have conduced invalidation of the cement mixing piles. Combining practical works of the engineering unit, a series of tests and studies have been done, for example, inspection of core-pulling and excavation, static loading test, testing the indexes of physical and mechanical properties with the decrease of the distance between cement mixing piles and septic tank, compressive strength test,etc.The research indicates that all test result have contented design demand and attained prospective effect. These studing have an important significance on the reinforcement design and engineering practice of red clay being polluted by organie matter.

Abstract: Interior design in modern room pursues culture taste. The illumination design is an indispensable part in shaping the culture of room. Because of the importance of artifical light in modern life, excellent illumination design plays a very significant role on shaping the lighting culture in room and improving people's quality of life.

Abstract: We have already considered the problem of joint work of structure, foundation slab and basis in [1, 2] (two-layer beam or slab on elastic basis). The distinctive paper is devoted to analysis of two-layer beam-strip on elastic basis, which corresponds to the problem of the plane deformed state. Nonlinear dependence of internal forces on structure height is presented.

Abstract: The human resources structure situation and its the subject problems of the Chinese construction enterprises were analyzed, The reasons were studied from the aspect of the planned economy system, human affairs system, internal management system and enterprise human capital investment. The target-oriented measures were proposed to optimize the human resources structure of the chinese construction enterprise and enhance the enterprise competitiveness.