Applied Mechanics and Materials Vols. 488-489

Abstract: The precast roof truss of prestressed concrete square pile is a new self-balancing system composed of prestressed concrete square pile, strut and steel tension rod. Based on finite element analysis methods, the bending moment and deformation under most unfavorable design load was checked upon crack resistant bending moment to verify its engineering feasibility, the optimal prestressed value was analyzed to get the camber of the top chord beam, and the optimal tension method for bottom chord tension rod was determined. Compared with finite element analysis results, the full scale model test was carried out to further verify its engineering feasibility and some optimization recommendation was proposed. It suggests that the tension order of middle section before diagonal rod, initial prestressed value of 10t, and prestressed control method of monitoring camber at midspan is the most reasonable and optimal solution.

Abstract: With the rapid development of the Chinese railway in recent years, the construction of so many large railway stations are needed. Because the roof and the canopy should be convenient for the passengers and goods to get through, the column spacing and span is large. In order to achieve the functional and aesthetic requirements of the railway stations, the dendritic column is developed. Dendritic structure is the building structure which is designed by the principle of zoology and undertaking force of tree among nature. It has particular appreciation and practicability. In order to determine the critical load and buckling behavior of the dendritic column from stable balance to unstable balance condition, the finite element model is established by the finite element analysis program ANSYS. And the linear overall stability, geometrical nonlinear overall stability, geometrical and material nonlinear overall stability were studied. Through changing such factors as the stiffness ratio and the height ratio between the trunk and the branch, span to height ratio of branch, etc., the authors further studied the nonlinear stability behavior of this new type structure. It is showed that the ultimate bearing capacity of the Y-shape column is high. And we got the conclusion that how these three parameters influence the ultimate bearing capacity of the dendritic column. And the results can offer reference for the design of the dendritic column. Your manuscript will be reduced by approximately 20% by the publisher. Please keep this in mind when designing your figures and tables etc.

Abstract: Investigation and analysis of the Northern Shaanxi meteorological conditions and solar resources, combined with history and experience of solar energy resource in local solar energy application, the paper analyzes the feasibility of the implementation of solar building integration in northern Shaanxi.

Abstract: Concrete filled double skin steel tubes which is developed on the basis of concrete filled steel tube, it is a new member. Combination of Chinese and foreign literature, this paper comprehensively discusses the research results about concrete filled double skin steel tubes member, then put forward the further research work, for concrete filled double skin steel tubes structure in deeply study to play a guiding role.

Abstract: The pile-soil dynamics is an interdisciplinary studies of structural, geotechnical and vibration engineering in the existing bridge. Traffic load model, the developments and status in the existing bridge were reviewed and introduced. The main content and characteristic of pile were summarized in clay, sand, silt and red clay. Main problems existed in the study of cyclic loaders on the piles were discussed. The prospect of future research trend in this field was also examined.

Abstract: Aqueduct is a conveyance structure which can across the channel, depressions, roads and railways and its conveyance water system is mainly composed of bridges, tunnels or ditch. Aqueduct is widely used in hydraulic engineering, and plays a role in irrigation ,water delivery , drainage and desilting. A large aqueduct can also be used for navigation. In the paper, based on the aqueduct design, aqueduct model making, aqueduct structure calculation and static load experiment, the whole process of design and calculation of continuous beam truss aqueduct model are performed, and the analysis of its mechanical properties are also carried on. These results are useful for the practical application of aqueduct structure.

Abstract: Jilin is a major city in northern China, and the Special geographical environment and rich history and culture made a profound impact on the evolution of urban form. The urban pattern has common features as other waterfront cities in northern China, and also has its own uniqueness. With the start of analysis of evolution of urban form,this paper divides the development of Jilin City into three phases according time node,and analyzes the form evolution and its causes of each phase,as well as the relationship of the three phases. Finally,the paper presents development direction of spatial pattern of Jilin city based on analysis,and provides reference for the development for cold water cities.

Abstract: This paper summarizes the design of reinforced concrete structure and its enclosure for a subaqueous tunnel used to cross a river in urban highway line. The tunnel mainly consists of open-cut section on river bank and cut-cover section under river bed. Their structure and enclosure are both illustrated in the paper according to site geology and general layout of urban highway line. The use of rotary bored pile and soil mixing wall to preserve the stability of open-cut foundation pit are summarized in the paper.

Abstract: The complexity of seismic response for skew bridge rises higher seismic-vulnerability relatively in comparison with right bridge. One of the parameters that directly affects the seismic response on a skew bridge is the excitation angle of the ground motion [. This paper investigates the effects of seismic force direction on the responses of skew bridges without considering impact effect in time history nonlinear dynamic analyses. The combination rules for orthogonal earthquake effects, such as the 100/ 30, 100/40 percentage rules and the SRSS method are also examined. It is concluded that the angle of excitation that produces the critical responses depends both on the ground motion and bridge characteristics, and the three combination rules are all relatively conservative, a new formula which considers the influence of skew angle and excitation angle of the ground motion is suggested.

Abstract: Seismic damage was the key reason which resulted in the serviceability degradation or collapse of the bridge. How to quantify the seismic damage and evaluate the seismic performance of the bridge under earthquakes through the damage analysis was the significant research direction in the performance based seismic design. In this paper the Park-Ang model (a well-known dual parameters model) and its modification version used for the damage evaluation of the concrete structure were compared. Furthermore, through the definition of the damage indices of the models based on the modified Park-Ang model and the descending slope of the IDA(incremental dynamic analysis) curve, the seismic damage levels of the typical bridge in the urban rail transit line under the designated earthquakes were analyzed, respectively. It was shown from the results that the calculated results from the two model was essentially consistent. The damage analysis based evaluation method was feasibly used for the seismic performance evaluation of the bridge.