Primary And Secondary Framework Mega Beam Connections And Setting On Mega Frame Structure Dynamic Response Influence

Mega frame structure is a new type of structure system, which not only can make the space division freedom and flexible, power transmission clear freedom, and have good overall performance, also can give full play to the performance of materials and structure to reduce the materials consumption and cut down engineering cost, etc. Therefore, do some research about the mega frame structure system has important practical significance and theoretical value.Through large general finite element analysis software SAP2000, the finite element modeling for giant frame structures is made to analyse the action of earthquake.In view of the different primary and secondary beam-column connection mode, giant beam-column stiffness ratio and the parameters for the mega beam about quantity and position, the different calculation schems are set up to conduct the modal analysis and the dynamic time history analysis under the action of two natural vibration, a artificially wave power and conclude the structural dynamic characteristics, deformation and characteristics and laws for internal force distribution in different circumstances, to provide the beneficial reference in the aseismic design for mega frame.The change of the connection mode for primary and secondary frame have little effect on the structure of cycle and deformation capacity, when connections for the structure change from rigid connections to semi-rigid connections, hinged connections, cycle increase slightly, vertex displacement increase appropriately, interlayer displacement angle slightly change, but the internal force distribution have certain effect, floor shear have downside and get to minimum when hinged. When giant beam-column stiffness ratio increase, structure of the cycle, vertex maximum displacement and the maximum for interlayer displacement angle decrease gradually, but the maximum for shear increase gradually.The increase in the number of mega beam make structure cycle and vertex displacement gradually decrease, but floor shear gradually increase. From the structure of side moving curve, it is still bending shear type which can't change along with the increase in the number of mega beam. When the number of mega beam are greater and mega beam is closer to the bottom, the bottom floor shear is bigger.Mega beam position is moved up to make structure vibration cycles increase gradually, the increase is little in the bottom and middle of structure, while structure vertex displacement increase significantly and floor shear gradually becomes smaller, but floor shear is very small different between floor mega beam setted on top and setted on middle. The maximum for interlayer displacement angle of structure is mainly located in the mid-lower of structure,but the maximum for interlayer displacement angle of structure is located in the upside of structure when it is set a mega beam which locacted near the bottom.