Advanced Materials Research Vols. 368-373

Abstract: 8 channel steel reinforced concrete beams and 1 reinforced concrete beam are tested to study the capacity of channel steel reinforced concrete beam(CSRCB)under pure torque. The failure mode and process of the specimens are observed, And the working mechanism of channel steel skeleton and the concrete are analyzed. It is shown that the concrete strength, stirrup disposition and channel steel have significant effects on the torsional capacity of the beam. The calculation formula for torsional craze torque and ultimate torsional capacity of the CSRCB member are also proposed .

Abstract: A model is proposed to analyze the tension-stiffening behavior of RC beams. The model takes into account the constitutive laws of constituent materials and the bond-slip relationship at the steel-concrete interface so that reliable responses of the RC beams in the post-cracking range can be obtained. It also allows the local behavior of RC beams to be studied in details due to the bond interaction between steel and concrete. Finally, the model capabilities are employed to analyze own experimental results. The midspan deflection and the mean steel strain of RC beams, computed with the proposed model, seem to be in good agreement with those measured in the tests.

Abstract: Based on the investigation of dilapidated houses in Wenzhou district, this paper descript the house characteristics such as construction sites, shape features, structure style, construction age and present conditions, and analyzed the reasons of houses become dilapidated. Combined with the typhoon and house disaster records, this paper also summarized the features of typhoon disaster and the wind-induced damage mechanism of rural residence.

Abstract: This article describes the basic principles of TM30 Georobot and GeoCOM port, completed the structural design of subway monitoring system database; Based on development environment with Visual Basic 6.0, Monitoring data to achieve automated collection of subway, as well as real-time analysis of monitoring data, Among them, the data were analyzed using different wavelet analysis model. Finally the automatic system is provided with monitoring data acquisition, real-time analysis and pre-alarm function, and provides report output.

Abstract: Height control is one of major concerns in historical and culture environment protection. The paper concerns that how to create good overall height order and proper handle relation between heritage protection and social economic development under precondition of meet demand of basic height control in historical and culture heritage protection area. The paper takes Qu Jiang New District of Xi'an as an example through comprehensive analysis of various factors such as heritage protection, visual line analysis and urban morphology, etc. It is also focuses on quantitative approach of height control in outer space of historical heritage from perspective of visual line analysis and so on. It is concluded that under the conditions of adequate focus on the value of urban space, the sudden increase of the height outside the protection areas should be avoided in order to have a more active overall environmental outlook of the city.

Abstract: Accurately estimating the deformation of high-rise buildings is a very important work for surveyors, however it is very difficult to get an accurate and reliable predictor. In this paper, a combined modeling and forecasting approach based on grey theory and the autoregressive model is proposed to forecast the deformation of the modern buildings. The results of experiments show that this method can forecast the deformation precisely, which provides a basis for performance analysis and forecasting. Meanwhile, it can also be concluded that the combined method has a higher forecasting precision to the complex problems than the single models, and therefore can be applied to deformation data analysis.

Abstract: Conditions were considered of complex geology and the hydrogeology of Minqin, the 3d numerical simulation model of groundwater system was built by FEFLOW software in the study area. Author found that hydrogeologic parameters which have been debugged many times corresponded with the hydrogeology prospecting results well. Verification results show that the model has better simulation effect and higher reliability in checking the model. Facts show that prediction of groundwater flow field has high reliability in the study area.

Abstract: Conventional method is getting static displacement calculated by dynamic displacement and impact coefficient aim at making the detection of the bridge faster and more precise. But in fact, it is too difficult to ensure the dynamic displacement under the influence of roughness of the bridge deck. For the reasons given above, this paper simulates the bumping testing on the cross section of midspan by explicit dynamic FEM. A vehicle passes through the cross tie which is higher than the highest unevenness, and then gives an impact load to the cross section of the midspan for getting the maximum dynamic displacement of the cross section. This method can eliminate the influence of roughness of the bridge deck and it is a new pathway of bridge dynamic testing.

Abstract: Karst caves are found in the bedrock of Aikou pitch core-walled rock-fill dam, of which the volumes of K6 and K5 all exceed 105m3. Due to K6 is within the stress influence range of the right abutment, it has significant effect to the right abutment compression deformation, dam stability and core stress. Three stress deformation study cases(none replacement, partial replacement, complete replacement of K6) are simulated by using 3D finite element method. The result showes that to ensure the compliance of dam deformation and avoid adverse stress occurred due to differential deformation, K6 should be replaced as completely as possible

Abstract: Problems and flaws of existing safety criteria for vibration are reviewed. A simple consideration of particle vibration velocity cannot fully reflect the inherent law of effects of explosion earthquake on structures. Sometimes the occurrence of explosions exceeding the standard velocity for safety will not necessarily cause damage to structures and those below the standard velocity for safety may destroy structures. For this reason, the free vibration frequency of structures and the safety margin of the structure should be considered. Based on safe, practical and convenient conditions, that in respect of safety criteria for dike and slope exposed to vibration, two indicators, i.e., stability factor of dike and slope and vibration velocity of particle, can be used to determine the effect of vibration on them is proposed. That is to say, pseudo-static method is adopted to make vibration inertia force equivalent to a static force on slope bars and then strength reduction method or limit equilibrium method is used to calculate the safety factor, which can directly evaluate the stability of slope. In combination with the particle vibration velocity given in specifications, the safety of dike and slope can be determined. Lastly, specific engineering cases are used to validate the rationality of this criterion. This method can serve as a reference for similar projects