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Plane irregular buildings are prone to torsion and cause serious damage to the structure. The analysis and control of structural torsion effect is the key to this kind of structural design. In this regard，the simulation calculation of the planar irregular multi-story frame model in the 8-degree fortification zone was carried out，and the planar L-type four-story frame isolation model of five typical class B buildings was established. The ratios of the length B and width W of the protruding limbs of the structure were set to be 1∶1，1.5∶1，2∶1，2.5∶1 and 3∶1，respectively. The dynamic characteristics and seismic response of different structures were analyzed. The influence of the LRB stiffness ratio and the rigid center position of the isolation layer on the structural torsion was discussed，and the effective control method of structural torsion was proposed. The results show that with the increase of the length-width ratio B/W of the protruding limb，the X-direction torsion of the structure increases gradually，and the Y-direction torsion decreases gradually. Increasing the proportion of LRB stiffness can reduce the torsional effect of the structure. By comprehensively controlling the structural torsion and structural damping coefficient，a reasonable proportion of LRB stiffness can be obtained. The proportion of LRB stiffness of the isolation layer under the condition of 8 degrees earthquake is proposed. At the same time，the rigid center of the isolation layer and the rigid center of the superstructure are arranged on both sides of the mass center of the superstructure to suppress the torsion of the superstructure of the plane irregular structure.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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