Applied Mechanics and Materials Vols. 71-78

Abstract: A hot-humid climatic wind tunnel using wind tunnel technology was developed to simulate the true outdoor dynamic climatic parameters, including solar radiation, air temperature, relative humidity and wind speed, which realized a small-step periodic changing climatic environment of a particular area. To obtain atmospheric evaporation force of porous material, water evaporation experiment representing the impact of climatic elements with atmospheric evaporation force was carried out, then a Penman formula based water evaporation experimental model was built. Considered to different texture of materials, different beginning times and different climatic parameters, porous material evaporation experiments were carried out and an experimental model was established.

Abstract: The paper analyses the renewal and adaptation modes of modern architectural heritages. The detailed rehabilitation techniques have been introduced from six perspectives such as the structure reinforcement. Every method has its merits and problems. The choice is made in accordance with the protection requirement, the condition of the building, and the target use of the restoration, etc.

Abstract: ABAQUS is used to study the load-settlement characteristic and soil displacement field of the pile raft foundation. Numerical results are compared to the outputs from model test. The study results show that good consistency is obtained from the comparison of results between numerical simulation and model tests. Small pile space will weaken the single pile bearing capacity. The compress region is mainly centralized in the soil beneath the pile tip to the 3b space pile raft foundation, which presents a massive deep foundation failure pattern. As the increase of pile space, the compress region under cap shifts upward. The displacement influence depth of 6b space pile foundation is smaller than 3b space pile raft foundation, and it is destroyed by the lateral squeeze of the soil around piles.

Abstract: The chaotic dynamics system is so complex that the traditional methods of nonlinear numerical approximation can’t intuitively reflect the characteristics of chaotic behaviors. We propose a simple method for visualizing the phase space of chaotic dynamics system. With the help of the visualization technology based on VTK(Visualization Toolkit), we can quickly render the phase space of the system with different phase values and this can help us explore the inner rule of chaotic dynamics system.

Abstract: The new calculation method of fundamental natural period of vibration for multistory and high-rise steel structure, in which semirigidity of joints between beam and column, shear deformation for the cross section and so on is considered at the same time, is presented in the paper. The lateral drift stiffness of column in steel structure and inter-story stiffness of steel structure, which joints semirigidity, shear deformation and effects for steel structure is simultaneously considered, is derived in the paper. General expression for stability function considered shear deformation of the cross section for beam-column members is put forward.The approach is relatively simple and more practical. It can be referred to steel structural design.

Abstract: Recycled concrete aggregates have large porosity, large water absorption and high crush index. Mechanical properties of recycled concrete aggregates could be improved by adding activated water instead of ordinary water. On the basis of the experimental studies, this paper analyzes the influences on recycled concrete compression strength when using activated water. There are many different factors such as the kinds and amounts of alkali and the water slag ratio affecting the compressive strength of recycle geopolymer. The results show that activated water has a high enhancement on compressive strength of recycled aggregate concrete, and the highest compressive strength of recycled geopolymer is 57.3MPa.

Abstract: Circular ring is the most popular specimen in industry. The location of a crack in a circular ring can strongly affect the sequence of plastic hinge development which in turn affects stability of a circular ring which has been obtained theoretically in Young [1] but not any numerically. Boundary element method is employed to investigate these effects. In fact, the ring will collapse if the number of plastic hinges is up to four. The results show the potential application of the boundary element method in this project.

Abstract: Based on the background of Xi-Jiang cross-river shield tunneling construction of gas pipeline network project in Guangdong province, this paper expounded engineering measures and innovative technology of the shaft maintenance structures under the composite stratum conditions, which included trench construction for diaphragm wall, reinforcement cage craning and installation, concrete spouting and static blast excavation, to provide some reference for similar projects.

Abstract: The global warming effect causes climate change. Especially, it directly affects the weather pattern of Taiwan. The temperature continually rising leads to higher energy consumption for building air-conditioning. The phenolic resin board is a very good heat insulation and eco-friendly construction material. Otherwise, a green roof covered with living plants for the purpose to reduce heat effect in building are widely used in the world. Therefore, in this research, the phenolic resin board is used as an experimental roof insulation material in a green roof that is covered with living plants for the objective of reducing summer building air conditioning energy consumption and cost. During summer, the difference between inside and outside temperatures across the phenolic resin board exposed to direct sun shine is as high as 8°C±2°C. The combined insulation technology using phenolic resin board and planted green vegetation coverage on the roof will also contribute to a green and aesthetic environment.

Abstract: Although some achievements have made in the rural reconstruction, some actual problems and misunderstandings are still existed. The villages are following the same patterns and they are monotonous without characteristics. They have no inheritance or history. Based on the analysis the concepts of regional culture and regional and their relationship, some methods can be used in regional protection during the rural reconstruction in order to solve these problems. And then it analyses the planning and construction of the Gulong village of Yangcheng city in Shanxi province which attempts to give some suggestions to the flowing rural reconstruction.