Abstract The purpose of the design is to do the anti-seismic design in the longitudinal frames of axis 4. When the directions of the frames is determined, firstly the weight of each floor is calculated .Then the vibrate cycle is calculated by utilizing the peak-displacement method, then making the amount of the horizontal seismic force can be got by way of the bottom-shear force method. The seismic force can be assigned according to the shearing stiffness of the frames of the different axis. Then the internal force (bending moment, shearing force and axial force ) in the structure under the horizontal loads can be easily calculated. After the determination of the internal force under the dead and live loads, bination of internal force can be made by using the Excel software, whose purpose is to find one or several sets of the most adverse internal force of the wall limbs and the coterminous girders, which will be the basis of protracting the reinforcing drawings of ponents. The design of the stairs is also be approached by calculating the internal force and reinforcing ponents as landing slab, step board and landing girder whose shop drawings pleted in the end. Keywords : frames, structural design, anti-seismic design
