Papers by Author: Shu Ping Cong

Abstract: Finite element model was built in order to study the section temperature field of concrete-filled double steel tubular columns through the software of ANSYS. Moisture of concrete and thermal contact resistance were considered in the model. Based on the Eurocode 2, specific heat of concrete was modified in order to consider the effect of moisture. Contact elements were created in the interface between steel tube and concrete in order to consider the effect of thermal contact resistance. The effects of diameter of steel tube and type of aggregate to section temperature field were studied. Distribution of section temperature field is given on the concrete-filled double steel tubular columns, which provides the basis for the analysis of fire resistance capability.

Abstract: The structural form of a kind of cellular hollow flat slab floor using thin wall plastic boxes was introduced. The equivalent frame method, which was used to analyze the internal force of this kind of cellular hollow flat slab floor, was discussed. Finally, the method to calculate the deflection of cellular hollow flat slab was investigated and some improvements in this method were presented. The effects of the cracks on the stiffness and deflection of hollow flat slabs were taken into account in this method to decrease the error of elasticity calculation results.

Abstract: Load-carrying system of reinforced concrete structure on construction is different from load-carrying system on service life. This temporary load-carrying system is composed of shores and concrete members of early age on construction. Geometrical model and material property of structure are time-varying on construction. Through secondary development of ANSYS, the processes of placing concrete and removing shore are simulated on construction. Critical effect factors are determined through the analysis on mechanical property of temporary load-carrying system, such as shore stiffness, foundation stiffness and diurnal temperature difference. Results of analog calculation to temporary load-carrying system will provide basis for shoring system design and structure reliability analysis on construction.

Abstract: Mechanical properties of high-rise building on construction and on service life are different. Geometrical model of structure and material property are time-varying on construction, so mechanical property analysis of high-rise building on construction is complex. The software of ANSYS is selected as the analysis tool. Construction process of high-rise building is simulated through the element “life and death” function of ANSYS. Results of analog calculation are close to the actual values of structure because of considering the construction process. It is beneficial to the safety of high-rise building on construction.

Abstract: The simplified calculation method of the temperature field of concrete filled steel tubular columns under fire conditions was studied for convenience. Firstly, a numerical program of finite difference method was developed to calculate the temperature field of concrete filled steel tubular columns subjected to fire, and the calculation results of the program have good agreement with the experimental results. Secondly, the effects of the steel tube thickness, the steel tube diameter and the type of concrete aggregate were analyzed on the base of plentiful experimental and numerical results. Finally, the effects of some major factors on the temperature field were simplified, and the simplified calculation method was presented to calculate the temperature field of concrete filled steel tubular columns based on data fitting. The precision of the simplified calculation method can satisfy the accuracy requirement of engineering practices.

Abstract: The loads of reinforced concrete buildings are bore by shores and early age concrete members during construction. In order to analysis the distribution of vertical load between concrete members and shores, the approximate method was developed based on the finite element method and simplified method. According to the process of construction, seven primary structures were brought forward in the approximate method. The coefficients of vertical load distribution between concrete members and shores are confirmed through the finite element method. The loads of concrete members and shores could be obtained conveniently through the distribution coefficients. Three shoring systems (2S, 2S1R and 3S) could be calculated by the approximate method, so the suitable shoring systems for reinforced concrete buildings would be confirmed.

Abstract: Based on experimental researches, a simple numerical analysis method was presented to simulate the full load-deformation process of bar-reinforced concrete filled steel tubular short columns subjected to axial compression. Firstly, the interaction process of steel tube and concrete was analyzed, and then, the simplified constitutive models of steel tube and concrete were established on the base of previous analysis results. Secondly, the relation between lateral and longitudinal strain of steel tube was analyzed based on experimental results, and a simple method was presented to calculate the lateral strain of steel tube. Finally, a program was worked out to simulate the full load-deformation process of bar-reinforced concrete filled steel tubular short columns. The program’s simulation results of both ultimate bearing capacity and load-deformation curves are in good agreement with the experimental results.