Generally, fatigue has not been considered as a key problem in the design of reinforced concrete bridges. Until the 1960s, reinforcement was mild steel and the stresses permitted in the steel bar and the concrete were such that fatigue and fracture failure was believed to be impossible. With the developments of reinforced concrete structures, higher working stresses were permitted and, in particular, high yield reinforcing bars were introduced. Design rules were issued to control cracking and to prohibit welding of reinforcement unless the risk of fatigue was negligible. In recent years, great deals of researches have been carried out, leading to a better understanding of the fatigue behaviors in concrete structures. Some studies showed that fatigue could occur in reinforced concrete structures in combination with other causes of deterioration. In the past eight years, considerable increases in traffic intensity and wheel loads have caused obviously fatigue damage in reinforced concrete structures in China. Some reinforced concrete bridges were damaged seriously, leading to the whole bridge collapse sometimes because of overloading and oversize trucks. So how to evaluate the fatigue safety of existing reinforced concrete bridges is an urgent problem in China. In the current paper, the assessment models of existing reinforced concrete bridges based on S-N curve and fracture mechanics approach were proposed considering the effect of overloading and oversize trucks. Finally the assessment method based on S-N curve and in-situ monitoring data was applied to a case study bridge.

The change law for fatigue properties of polyester fiber asphalt concrete was acquired under different asphalt content by three point bending tests. The results indicate that fatigue life of polyester fiber asphalt concrete increases firstly and then declines with asphalt content increasing, which shows an optimum asphalt content,4.8%. The optimal asphalt content of polyester fiber asphalt concrete is bigger than that of common asphalt concrete. The way to improve fatigue performance of asphalt pavement is found through studying on polyester fiber asphalt concrete. All will provide a theoretical basis for structural design of asphalt pavement.

The idea of low carbon has found its way into tourism industry and caused revolution of tourism development mode. Therefore, the integrated management mode for low carbon scenic zones has become our new pursuit. Taking Taishan, the world material and cultural heritage, for example and based on investigating the status quo of low carbon tourism of Taishan scenic zone, this paper analyzes the problems and their causes with the integrated management mode for scenic zones and then forwards two new ways, that is, forming an industry league to develop exhibition tourism in scenic zones and building integrated management modes for Taishan low carbon scenic zone of low carbon tourism industry chain within scenic zones, thus providing idea and reference for the low carbon tourism development of Taishan scenic zone, and even other areas across China.

Slope stability analysis is of great significance in geotechnical engineering, for which there are various research approaches as limit equilibrium analysis, numerical analysis, neural network based analysis, etc. Being one of the modern approaches, slope stability analysis based on GIS rises and develops swiftly. Authors give a brief introduction of the theory, research procedures, new developments and try to make it clear the new trend in slope stability analysis. Finally, the slope stability system which was developed based on GIS is introduced. The system which can analyze slope stability based on data mining including fuzzy clustering analysis, regression analysis, extension evaluation etc has provided with more powerful slope stability functions and is easy to be integrated