Advanced Materials Research Vols. 168-170

Abstract: In order to study the impact of cushion thickness on the long-short piles composite foundation,the relation between bearing capacity and settlement,distribution of the axial force and skin friction along pile,pile-soil stress ratio, load sharing ratio and the bearing mechanics of long-short-pile composite foundation with long and short piles were studied based on laboratory tests in three different conditions:zero-centimeter-thick cushion, two-centimeter-thick cushion and five-centimeter-thick cushion in this paper. Conclusions were as follows: The settlement of long-short piles composite foundation increased with the increasing of cushion thickness,Without cushion,the maximum axial force occurred in the pile top.After having paved cushion,it occurred in the neutral dot.The axial force of long and short piles decreased with the increasing of cushion thickness; Without cushion, only positive skin friction occurred. After having paved cushion,negative skin friction came into being existence.The value of long piles skin friction increased with the increasing of the cushion thickness,the value of short piles skin friction decreased with the increasing of the cushion thickness;The pile-soil stress ratio of long pile decreased with the increasing of the cushion thickness while the pile-soil stress ratio of short pile change little,The load sharing ratio of long piles were larger than that of short piles and soil.With the increasing of cushion thickness,the load sharing ratio of long and short piles became smaller while that of soil became larger.

Abstract: This study takes the ventilation into consideration, making the active building envelope (ABE) system more close to the realistic application conditions. The ABE system is comprised of a photovoltaic unit (PV unit) and a thermoelectric heat pump unit (TE unit). The PV unit consists of photovoltaic cells, which convert solar radiation energy into electrical energy. The TE unit consists of thermoelectric heaters/coolers (referred to here onwards as TE coolers), which convert electrical energy into thermal energy, or the reverse. The PV and the TE units are integrated within the overall ABE enclosure. The new mechanism of a hybrid system was proposed. A ducted wind turine will be integrated with the ABE system becoming dual core. Then the analytic model of original ABE system has to be revised and analytic solution will be resulted and verified by the numerical solution of CFD. The ducted wind mill will provide air conditioning and power the ABE system, to higher the thermal efficiency of the heat sinks of TE system. Numerical and experimental works will be investigated. a building installed the ABE system wind, solar driven, bypass the windmill flow as a air flow, ambient temperature, To is equal to 35 oC and indoor temperature, Ti is 28 oC. Numerical results show the Ti will decrease 2 oC when the ABE operating with heat sinks, without fan. As fan is opened, strong convective heat transfer, Ti will decrease approximately 4 to 5 oC. We hope findings of this study can make the dream of healthy living comfortable room come true.

Abstract: Yangming Shu Wu was originally named “Chung Hsing Hotel”. It was established in 1970 and opened since 1971.It is the only official residence chosen by late President Kai-Shek Chiang to be established in Taiwan. At present, Yangming Shu Wu is a importance in culture and history. This study investigated the visual image of armchairs in Yangming Shu Wu. Using SD questionnaire survey and statistical analysis were employed to conduct this study, and a total of 115 questionnaires were distributed. The result indicated that, the styles of armchairs could be divided into three categories: (1) Chinese style armchairs: most of them are Qing-style armchairs, which are characterized by the presence of leg rests and the sculptures of glossy ganoderma, symbol for good luck, or faces of animals, etc. at the end of chair legs. In terms of materials, teakwood, rosewood, and kingwood are the common materials. The most frequently used material is teakwood, which exhibits the image of rigidity, magnificence, classicality and nobility. (2) Western style armchairs: they are the typical Queen Anne style armchairs. In terms of materials, only teakwood is used, which exhibits the overall image of magnificence, classicality, curving, nobility, modernization, innovation, and uniqueness. (3) Chinese-western integrated style armchairs: they are mainly made of teakwood as well. Most of them are designed with the Qing-style chair legs, and the seat back is decorated with seat back fabrics with lining, which exhibits the overall image of rigidity, magnificence, classicality, straightness, and nobility.

Abstract: High-rise buildings in China has developed rapidly in recent years and problems such as construction and vertical transportation have been paid close attention more and more by society. The safety project management objective system mentioned in this article has comprehensively considered the characteristics of high-rise construction and vertical transportation and provided a comprehensive evaluation system for vertical transportation equipment for high-rise construction, which may be used for guiding equipment selection and optimization of equipment use. Meanwhile, the study results are applied in practical project to verify its effectiveness and practicability, so as to guide the enterprises to reasonably select and use vertical transportation equipment for high-rise construction and to realize the integration benefits of the project.

Abstract: Traditionally the design phase was carried out by one single person – the master builder. Industrialization and technical development led to a split of the role of the design master into two: the architect and the engineer. Today, demands on functionality such as energy and cost efficiency led to an increasing need of functioning collaboration in large teams during the design phase; as well as a need of new work methods within the process. This calls for employees who are experienced in collaborating in interdisciplinary teams. To fulfill this demand a multidisciplinary course in “Advanced building design” has been developed at the Technical University of Denmark. The goal of the course is to provide training in teamwork at the final stage of the engineering education. The course has been carried out twice. It was held by a multidisciplinary team of professors in periods 2008/09 and 2009/10. The team of professors and the student teams had similar working conditions. These teams were subject of a questionnaire investigation on collaboration and team work. The study has the following findings. Collaboration can be learned and improves in time. It is shown that the team leader is not necessarily to be found within on specific profession. The team-structure was generally flat and decisions were mostly made in consensus. It is worthwhile to offer a multidisciplinary course and give engineering students experience in collaboration methods.

Abstract: In order to solve the problem of wear-out–failure of diesel engine cylinder, the laser-quenching and low temperature ion sulfurizing complex surface treatment technology was operated on the surface of 42MnCr52 steel. And the tribological properties of the complex layer were investigated。Experimental results indicated that the complex layer is composed of soft surface sulphide layer and sub-surface laser-quenching harden layer, represents excellent friction-reduction and wear-resistance performance at high temperature. The synergistic effect of the laser quenching-sulphide layer resulted in 20% increase in hardness, 10% reduction in friction coefficient and 50% reduction in wear weight loss, respectively, compared with those of the standard samples. The bench-test further demonstrated that this technology can improve the lubricating condition between cylinder and piston ring, and reduce both abnormity wear when the lubricating oil is deficiency at the time of start-up and sticking wear at high temperature during the operating period, and then prolong the service life of engine.

Abstract: The confirmatory test region plays an important role in the Kunming new airport to confirm the compactness and engineering properties of backfilling materials such as red clay, Douposi heavily weathered material and Douposi weak-middlely weathered material by vibration and dynamic consolidation method(DCM). Test results show that (1)the density of red clay is no less than 93.0% after compaction, which is satisfied with the requirement of design.(2)the density of Douposi heavily weathered material is no less than 93.0% after compaction, which is satisfied with the requirement of design.(3) the heavy dynamic penetration test of Douposi heavily weathered material shows that the blow count of embankment with depth between 3.0m ~7.0m is higher than that one of embankment with depth between 0.0m ~3.0m. According to the compactness test, the density of Douposi heavily weathered material embankment is no less than 93.0% when the blow count of heavy dynamic penetration is above 5.8.(4) on the condition of the DCM construction of main tamp with 1 time and inter-grid of different construction layers along depth, the density of lower layer of embankment is increased obviously, and the density of upper layer of embankment is also increased when the DCM construction is continued. It is suggested that after the DCM construction of main tamp with 1 time is completed, the DCM in the lower energy level and full tamp with 1 time or the bumping vibration compaction is adopted, the density of Douposi heavily weathered material embankment will be increased.(5)there is the same result and the suggestion for Douposi weak-middlely weathered material embankment. The test result can be provided as the reference for the consolidation of karst funnel in Kunming new airport and similar engineering.

Abstract: The article derived the formula of continuous particle size of asphalt aggregate packing density based on the Stovall model; according to the relationship between porosity and rutting, rutting prediction model was established; by experiment to determine the parameters in the formula to be determined , and the applicability of the formula was verified, the results showed that: the formula can calculate air voids and dynamic stability of asphalt mixture by aggregate size distribution and the aggregate ratio .

Abstract: As modern projects are getting increasingly complicated in the changeable environment, the risk in cost faced by construction enterprises increase. Therefore it is necessary to analyze all sorts of cost risks to guide decision-making. A entropy-weighted matter-element model for assessment of cost risk is established in the article, and an example is used to explain that the model makes a good application.

Abstract: Soil around the cylindrical pore is divided into elastic and plastic regions. In the elastic region, the small deformation theory is applied while in the plastic region, the large deformation theory and unified strength criterion are applied. According to the stress equilibrium equation and the boundary condition of continuous stress and deformation, the theoretical solution to plastic region radius, limit expansion pore pressure excess pore pressure and excess pore water pressure of the cylindrical cavity expansion can be derived when considering large deformation and non-drainage problems. Compared to the theoretical results of Cao L.F., the theoretical calculation results are closer to the field test results which show that the theory has a certain value in engineering application. Through calculations and analysis, it is also derived that expansion pore pressure increase is non-linear with the increase of b value, while the excess pore water pressure is just the opposite.