Research On Large Span Floor’s Comfortable Under The Walking Loads

Modern engineering structures are developing to the large span, lightweight and flexibility, the vibration caused by human activities of the structure is more and more significant, this vibration is often not enough to bring the structure of security problems, but can bring discomfort to the people who lives in it, reduce the quality of work and residence, affect the normal life of people, so it called comfortable issues.The loads generated by human activities are important factor which may cause structural Comfortable problem. Including jumping loads, walking loads or some other special movement of the instantaneous loads form. In this article, Benxi·drugs Exhibition Centre is the prototype, analysis the floor’s comfortable in its actual usage.According to the actual needs of the project, taking into account the Exhibition Centre based on exhibition,crowd walking loads become the main way that can cause structural vibration. In this article,Specifically for walking load’s calculations and select,make a large number of analyzes.The standard that which Floor Comfort can refer to of each country are different, this article choice one of the most stringent standards to design, that the structure from the natural frequency o≥3Hz and the vibration maximum acceleration limit≤0.005g. Calculated using three methods at the same time on the floor of the Convention Center, were calculated, finite element analysis of SAP2000and finite element analysis of MIDAS/Gen.In the formula, collation and analysis the Structural mechanics, structural dynamics, and other domestic and foreign experimental data obtained,deduced the calculation method for the engineering Comfort analysis.The calculation model select the largest column grid size of exhibition center, the result shows floor’s vertical natural frequency and maximum peak acceleration are satisfy the international standards.Then use the SAP2000create structural model, under the steady-state analysis,the point in the structure resonance frequency of the effect which is maximum displacement can be found. And dynamic loads applied in the same frequency of the walk, you can walk in the resonance frequency acceleration loads away curve, curve maximum peak acceleration is the point (or structure). Similarly, in the fourth chapter of the content for the calculation of the time course load function model described in detail.At last, use MIDAS/Gen establish the structural model, the differences with SAP2000model respect to that model board unit to establish a rigid floor model and process analysis. Finishing more than three analytical way the results are in line with the international standard floor Comfort.After comparison the results of three analytical methods, get the relevant conclusions of Benxi·Drugs Exhibition Centre’s vibration response form under the walk loads. Reference to the requirements of international comfortable standards, verify that the comfortable problem will not occur in this process.