The Influences Of Infill Wall On Natural Vibration Period Of Multilayer Reinforced Concrete Frame Structure

In the design of multilayer reinforced concrete infill wall frame structure, usually we only design the main body frame structure, and think infill wall is not a structure element, the weight of filler wall is a dead load on the beam, reduction period time to consider the stiffness of filler wall. But the period time deduction factor of frame structure choose between 0.5 and 0.9, the range is bigger, and there is no specific method to choose it, furthermore not considering the influence of filler material.Therefore, Respectively from layer, horizontal and vertical arrangement, filling rate, open hole rate, area rate of the hole, thickness and elastic modulus, volumetric weight several aspects, this article comprehensively analyzed the influences of infill wall on natural vibration period of multilayer RC frame structure, the main work is as follows:First of all, introduces the theory calculation method of the natural vibration period of frame structure, summarizes and comparison the empirical formula calculation method of the natural vibration period of frame structure in the standard specification of China, the United States and other countries, In order to provide certain theoretical basis for practical engineering design.Secondly, used the SAP2000 V15 software to simulate the modal experiment of a infilled frames with two spans and two bays and four-story, and respectively used SAP2000 and ANSYS and MIDAS GEN software to set up the standard model in this paper, to verify the rationality of SAP2000 model from two aspects of testing and software.Thirdly, fired common brick as filler material, used SAP2000 V15 software to set up the typical RC frame model, and respectively discuss the influences of layer, horizontal and vertical arrangement, filling rate, open hole rate, area rate of the hole, thickness on natural vibration period of multilayer RC frame structure, to obtain k1、k2、k3、k4 that is the influence coefficient of filling rate, open hole rate, area rate of the hole, thickness.Finally, changed the filler wall material, and research the influences of the different masonry material on natural vibration period of multilayer RC frame structure.and respectively considered the influences of elastic modulus and volumetric weight on natural vibration period of multilayer RC frame structure, to obtain k’、k" that is the influence coefficient of elastic modulus and volumetric weight, the material influence coefficient is ko and k0=(?),eventually put forward the calculation method of natural vibration period, the basic period of structure is T1= kT0 and the period time deduction factor is k=k0k1k2k3k4.