Advanced Materials Research Vols. 838-841

Abstract: One approach to promote forest growth is the pruning and thinning of trees. In the field of building structure, it is necessary to use thinned woods as timber positively. However, timber is too weak to apply to the large-scale buildings. Research and development of a building system to use timber are demanded. Authors propose composite steel-timber structure aiming to spread wood to building construction field considering the global environment. First, distribution volumes of planted forest of each age forest class in Japan and its CO₂ fixation are shown, investigating forest resources. Finally, the specific example of a composite steel-timber structure is shown and CO₂ fixation at building structure model using a composite steel-timber structure is estimated.

Abstract: Derrick supported by inner suspension and inner backstay group tower is a construction technique commonly used in the construction of overhead transmission lines, the locale sketch and construction technique are complex, and not conducive to the analysis of the key construction and improve the level of decision-making. Through analysis assembly tower construction technology of derrick supported by inner suspension and inner backstay, using engineering visualization design software 3ds Max, the establishment of a three-dimensional model of the tower, the pole, tackle. According to the construction process for dynamic visual simulation, accurate image show the complexity of the construction process. Visual simulation provides an intuitive basis for the construction organization design and construction scheme optimization; enhance the level of construction management.

Abstract: Through the finite element analysis, studies on mechanical performance of prestressed steel-concrete composite beams when it is undered the low reversed cyclic loading, based on constitutive model of elastic-plastic and consider nonlinear property of materials, it indicated good agreement with the experiment. Change concrete strength of composite beams and study hysteresis curve, energy dissipation and so on.Study found that with the improvement of concrete strength, the hysteresis loop of prestressed steel-concrete composite beams become plump, down by the load carrying capacity, energy dissipation ability were improved significantly.when the load upward, the load bearing capacity,energy dissipation have a small rise, but not obvious. Incresae the concrete strength is good for dynamic performance of prestressed steel-concrete composite on the whole.

Abstract: In this paper, taking one deep excavation engineering as an example, modeling by the FLAC^3D finite difference software, combining with the Lizheng deep excavation supporting design software, taking the equivalent stiffness of combination pile as 2.300-4.789(10^-2m³), and analyzing the pile body bending moment, anchor axial force and pit deformation by considering interaction of pile stiffness. In addition, in this paper the influence factors of pile stiffness has been discussed, and provides a reference for the engineering design.

Abstract: In order to clear the relationship between the steel stairs and calculation results, finite-element software was used to make an analysis about the influence of traditional steel stairs and sliding bearing steel stairs to the overall performance of frame structure, including the analysis of influence of eccentric structure under earthquake, and the interlayer displacement rate.

Abstract: Fourteen concrete columns with various sizes confined by BFRP and hybrid FRP and six plain concrete columns as the control specimens were axially loaded to failure in order to investigate both confining effects and size effects in concrete columns confined by BFRP and hybrid FRP. Experimental results show that BFRP and hybrid FRP can increase considerably both the capacity and ductility of the concrete specimens. Furthermore, the peak stress of the unconfined concrete decreases with the size of the specimens increasing. Similarly, the peak stress of BFRP confined concrete decreases with the size of the specimens increasing when the lateral confining stresses are the same. Hence, both confining effect and size effects should be considered carefully in the stress-strain model of concrete confined by BFRP. In addition, both strength and ductility of concrete confined by hybrid FRP in case of CFRP as inner layers and BFRP as outward layers are better than those in case of BFRP as inner layers and CFRP as outward layers.

Abstract: The buildings wall systems in Di-Hwa Street of Taipei, is quite different with the other historic area houses. In which the wall of building are made by different materials, such as earthen brick wall, stone brick wall, clay kiln brick wall, and their combination with un-regular types. The practicality of the proposed methodology is demonstrated through the Etabs software package analyzing the equivalent diagonal bracing models of each wall systems and evaluating the seismic resistant capacity of the brick wall structure. According to the analysis results, the seismic response control in displacement was observed. The seismic resistant capability of all of the brick wall structure, which were not enough to satisfied the design specification requirement according to the Ministry of Interior. also further increase the implementation of the improve devices on the displacement control of buildings is necessary.

Abstract: Carbon fiber reinforcement polymer could be used to replace steel tendon to bear loads together with concrete to solve the problem of steel tendon corrosion in concrete members. To study mechanical behavior of this kind of member, four concrete beams of partially prestressed with non-bonded carbon fiber reinforcement tendon were fabricated. In these beams, the reinforcement was taken as non prestressed tendon and carbon fiber reinforcement polymer tendon was taken as non-bonded prestressed tendon. Four points bending experiment were completed. Then the mechanical behavior of these beams has been studied through finite element analysis. The results show that a good agreement between experimental and finite element analysis results.

Abstract: By calculating a large span roof structures, get the intrinsic mode and real-time response of the structural under earthquake. The results showed that, the vertical acceleration response of structure is smaller than the horizontal acceleration response under EL-Centro wave and Tangshan wave. The vertical acceleration response is greater than the horizontal acceleration response under Lanzhou wave. The vertical displacement response of structure is greater than the horizontal displacement response under earthquake. Roof Destructed before the steel skeleton damage.

Abstract: Rational finite element models established by ABAQUS to analysis the mechanical properties of square steel tubular beam-column joints under low cyclic loading. The two beam-column joints are connected with bolts, one is with welding extended steel sheets at the beam root and the other has no welding extended steel sheets. The calculation and analysis results show that the new joint style using concrete filled steel tube structure both in beams and columns has advantage on the seismic performance. The load-displacement hysteresis curve of the beam end is plump without significant pinching and the joint specimens showed good ductility. The comparative analysis reveals that the joint with welding extended steel sheets at the beam root is more superior in the seismic performance respected to the joint without welding extended steel sheets.