The design concept structure has the following considerations in the selection of the section of the component. The winding is mainly pressed, and the box section can improve the stability factor of the member. The maximum cross-sectional dimension is t500@600@40@40. The lower string is made of H-shaped steel, the maximum section size is H500@800@30@50, and the flange is arranged in the vertical direction according to the architect's requirements.
The upper chord plane structure layout diagram below the chord plane structure arrangement 12 structural calculation project using the SAP2000 program for the overall modeling and calculation of the roof steel truss and the lower reinforced concrete main structure. Both the truss rod and the main structural beam and column are beam elements, and the shear wall structure is made of shell elements. The roof steel truss steel strength grade is Q345C.
The purpose of the spring limit bearing is to limit the thrust of the roof frame to the load-bearing column by the action of the spring, and control the internal force of the main structure under vertical load and earthquake to achieve the effect of protecting the main structure. The effect of the spring limit bearing can be seen by the calculation and comparison of the spring limit bearing and the fixed hinge bearing.
With the spring limit bearing under the vertical load and multiple earthquakes, the horizontal displacement of the bearing spring is as shown. The table shows the relative displacement of the truss support point and the top of the column, ie the amount of compression of the spring. The bearing spring number is indicated in the middle. When the spring limit bearing is used, the internal force of the load-bearing column is as shown. Since the structural plane is square and symmetrical, only the displacement of the 22 and 24 bearing springs is listed.
For the occasional earthquake, the spring sliding bearing has the greatest effect, which plays a good role in damping, so that the maximum thrust transmitted by the truss to the column and the maximum bending moment of the column are greatly reduced. The horizontal displacement of the truss when using the spring limit bearing is greater than the displacement when the fixed hinge bearing is used, but still meets the requirements.
Due to the slidable support, it can be seen from the displacement of the top of the column that the deformation of the truss plane is increased. Therefore, the stiffness in the plane of the truss should be appropriately increased to prevent excessive stress on the partial members due to excessive displacement difference between adjacent supports.
Conclusions and Recommendations (1) Generally, in large-span steel structure roofs, the house has a large thrust against the load-bearing members, and the spring limit bearing can control the thrust through the selection of spring stiffness during the design process. (2) The use of the spring limit bearing to reduce the force of the main structure supporting the roof is particularly obvious under the action of earthquake, thereby ensuring the safety of the main structure and reducing the amount of corresponding materials.
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