Study On The Seismic Performance Of Rectangular Steel Tube Concrete Bundle Shear Walls With Different Shear Connectors Of Wind Turbine Towers

The nation has boosted the production and use of renewable energy in order to meet the"double carbon" objective.Wind energy is a significant component of renewable energy,and The development of the wind power industry in recent years has gradually favored the low wind speed area,which needs larger blade diameter and higher tower to obtain more wind energy due to the scarcity of wind resources in the low wind speed area.Based on the above factors,This paper presents a wind turbine tower assembled from a rectangular steel tube concrete bundle shear wall,the rectangular steel tube concrete bundle shear wall consists of five single pieces of shear wall connected to form an axially symmetric structure.The effect of different shear connectors(studs,I-shaped stiffening,L-shaped stiffening)on the static and seismic performance of rectangular steel pipe concrete bundle shear walls was investigated by using a single-piece wall as the object of study.These are the specifics of the work:(1)Studied the influence of different shear connectors on the bearing capacity of shear walls under compression bending and tension bending loads,and the effects of different parameters such as steel plate thickness,studs spacing,I-shaped stiffener spacing,and L-shaped stiffener spacing on the bearing capacity of shear walls were analyzed.The results show that compared with shear walls without shear connectors,the in-plane and out-of-plane bearing capacity of L-shaped stiffener shear walls under compression bending conditions have increased by 27.3%and 51.3%,respectively.The in-plane and out-of-plane bearing capacity under tension bending conditions have increased by 46.4%and 49.5%,respectively;Changing the thickness of steel plates has a significant impact on the bearing capacity of shear walls;The effect of changing the spacing between studs and I-shaped stiffeners on the bearing capacity of shear walls is relatively small;When the spacing between L-shaped stiffeners was reduced from 250mm to 100mm,the bearing capacity of the shear wall in and out of plane under compression bending conditions increased by 17.6%and 21.8%,respectively.The bearing capacity of the shear wall in and out of plane under tension bending conditions increased by 25.2%and 27.1%,respectively.From the above analysis,it can be concluded that selecting L-shaped stiffener shear walls with appropriate spacing has better bearing capacity.(2)The in-plane stress mechanism of standard specimen STW1 was analyzed,and the effects of shear connector form,bolt spacing,I-shaped stiffener spacing,and L-shaped stiffener spacing on the in-plane seismic performance of shear walls were studied.The results show that the installation of L-shaped stiffeners significantly improves the bearing capacity and energy dissipation capacity of shear walls;Changing the spacing between studs has a significant impact on the energy dissipation capacity of the shear wall,but has a smaller impact on the bearing capacity of the shear wall;Changing the spacing of L-shaped stiffeners has a significant impact on the seismic performance of shear walls.When the spacing of L-shaped stiffeners is changed from 250mm to 100mm,its peak load and energy dissipation capacity increase by 17.9%and 36.8%respectively;Changing the spacing of I-shaped stiffeners has a certain impact on the seismic performance of shear walls,but the impact is not significant.Taking into account economic and seismic performance,it is recommended that the spacing of I-shaped stiffeners should not be less than 150mm.(3)Analyzed the stress process outside the STW1 plane,and studied the effects of shear connector form,bolt spacing,I-shaped stiffener spacing,and L-shaped stiffener spacing on the seismic performance of shear walls outside the plane.The results show that the bearing capacity of the shear wall outside the plane is approximately 1/5 of the in-plane bearing capacity;Compared with shear walls without shear connectors,the peak load of shear walls with L-shaped stiffeners has increased by 17.3%,44.1%,and 56.6%,respectively.Both types of stiffeners have significantly improved the load-bearing capacity of shear walls;Changing the spacing between studs and I-shaped stiffeners has little effect on the bearing capacity of shear walls.The energy consumption difference between shear walls with different shear connectors is relatively small;The spacing between studs has changed from 250mm to 100mm,and the cumulative energy consumption of the shear wall has increased by 53.9%;Therefore,it is recommended to set the spacing between studs to 100mm to increase the energy dissipation capacity of the shear wall.(4)Based on the numerical simulation results,a formula for calculating the bending bearing capacity of shear walls was derived,and the calculation results were compared with the numerical simulation results.The error between the formula for calculating the bearing capacity of shear walls and the numerical simulation results was within 20%.The skeleton curve was dimensionless organized using a three line model,and the restoring force curve of the shear wall was drawn.The formula for this curve was derived and compared with the finite element skeleton curve.The fitting effect was good.