This paper is concerned with the response of a rigid body subjected to base excitation. Using analytical and numerical methods of investigation, the results are presented in a series of graphs giving (1) the criteria for initiation of various modes (rest, slide, rock and slide-rock) of response and, using an ensemble of 75 real earthquake acceleration records, (2) the mean plus standard deviation of the distance of sliding relative to the base and (3) the probability of overturning during rocking. Based on the results in (3), two tables are prepared which give, corresponding to probability of overturning equal to 0.16 and 0.5, allowable peak base acceleration.
Study on temperature distribution simulation during cementing of hot dry rock (HDR) geothermal well is rare. It has important guiding significance to simulate the construction process of temperature distribution of hot dry rock on site construction. Based on numerical simulation of HDR considering heat-fluid-solid coupling, the influence of temperature distribution on well cementing is analyzed when the drilling fluid cycles and reaches stable state, respectively, and when the cement slurry is injected during the cementing process. It is found that the seepage at the well bottom accelerates the flow velocity of wellbore; the stable temperature change is less than the cyclic temperature change; and the upper and lower temperature variation of the stratum is greater when the cement slurry is injected. Therefore, as to cement retarder involved, the influence of temperature variation on concretion should be considered during cementing of the hot dry rock geothermal well.
Error sensibility analysis of finite element model is widely used to obtain high-accuracy model, which is very important for structure simulation, damage identification and health diagnosis. ANSYS finite element software is used to build the initial model of three-span concrete-filled steel tubular arch bridge, and calculate the dynamic and static response value which is the basic compare parameters. Impact of different modeling factors to local dynamic and static response value of model is researched and the sensitivity of each response error to different modeling factors is summarized. In all the factors of modeling, the most important factor influencing the dynamic and static response of this bridge is the synergy between steel tubular and concrete. The result can be the reference when the concrete filled steel tubular arch bridge model is built.
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