【作者】 王辉；

【导师】 徐枫；

【作者基本信息】 哈尔滨工业大学 ， 建筑与土木工程（专业学位）， 2021， 硕士

【摘要】 连体双塔超高层建筑因其造型美观,能够高效连接子塔间的人流交通等优点,越来越多地出现在大众的视野。由于连体存在造成连体双塔超高层建筑动力特性和风荷载分布更为复杂,求解响应和等效静力风荷载的难度进一步增加。峰值响应会影响结构安全以及居住舒适度,等效静力风荷载是结构工程师进行结构设计重要的荷载输入。研究连体参数对连体双塔超高层建筑风致响应和等效静力风荷载影响规律很有必要。本文通过数值模拟和风洞试验相结合的方式,研究连体双塔超高层建筑风致响应和等效静力风荷载特性。建立连体双塔超高层建筑的有限元模型,并验证其合理性。将连体双塔动力特性计算程序得到的频率与有限元分析得到的频率进行对比,证明了动力特性计算程序的可靠性。在此基础上研究了连体参数两两变化对连体双塔周期的影响规律。将不同工况的风洞试验数据绘制成平均风压云图和脉动风压云图,研究了连体双塔和单体超高层风压分布的差异,探索了连体高度和子塔间距对平均风压和脉动风压分布的影响。基于连体双塔动力特性计算程序得到的频率和振型,以Newmark-β法和振型叠加法为基本原理编制成连体双塔响应计算程序。将连体双塔响应计算程序得到的计算结果与有限元响应计算结果进行对比,证明了响应计算程序的可靠性。在此基础上,研究了连体质量、连体轴向刚度、连体弯曲刚度和连体所在高度两两组合对连体双塔位移、速度、加速度、扭转角、扭转角速度和扭转角加速度的影响规律。通过对比连体双塔和无连双塔有限元时程响应计算结果,证明了连体的存在对峰值响应的影响不可忽略(尤其是沿连体轴向的X向位移)。以单塔超高层建筑等效静力风荷载计算方法为基本原理,结合连体双塔超高层建筑的特点,考虑子塔间的风荷载相关性以及连体结构对连体双塔频率振型的影响,编制成连体双塔等效静力风荷载计算程序。将等效静力风荷载加载到有限元模型中,通过与有限元模型的时程响应对比,平动和扭转吻合度较好。更多还原

【Abstract】 Because of its beautiful shape and its ability to efficiently connect the flow of people between the sub-towers,the conjoined twin towers super high-rise buildings appear more and more in the public’s vision.Because of the existence of the conjoined twin towers,the dynamic characteristics and wind load distribution of the conjoined twin towers are more complex,so it is more difficult to solve the response and equivalent static wind load.The peak response will affect the safety and comfort of the structure.Equivalent static wind load is an important load input for structural engineers in structural design.It is necessary to study the effects of conjoined parameters on the wind induced response and equivalent static wind load of conjoined twin towers.In this paper,the wind-induced response and equivalent static wind load characteristics of conjoined twin towers are studied by numerical simulation and wind tunnel test.The finite element model of conjoined twin towers supertall building is established and its rationality is verified.The frequency obtained by the program is compared with that obtained by the finite element analysis,and the reliability of the program is proved.On this basis,the influence law of the change of the conjoined parameters on the period of conjoined twin towers is studied.The wind tunnel test data of different working conditions were plotted into mean wind pressure cloud maps and pulsating wind pressure cloud maps.The difference of wind pressure distribution between conjoined twin towers and single super-tall buildings was studied.The influence of height of conjoined twin towers and spacing of sub-towers on the distribution of mean wind pressure and pulsating wind pressure was explored.Based on the frequency and mode of vibration obtained from the dynamic characteristic calculation program of the conjoined twin towers,the response calculation program of the conjoined twin towers is programmed on the basic principle of method and mode superposition method.The reliability of the response program is proved by comparing the results of the response program with those of the finite element program.On this basis,the effects of pairwise combination of mass,axial stiffness,bending stiffness and height on displacement,velocity,acceleration,torsional Angle,torsional angular velocity and torsional angular acceleration of the twin towers are studied.By comparing the calculation results of finite element time-history response of conjoined twin towers and unconnected twin towers,it is proved that the influence of conjoined twin towers on the peak response cannot be ignored(especially the X-direction displacement along the conjoined axis).Based on the calculation method of equivalent static wind load of single tower supertall building,combined with the characteristics of conjoined twin tower supertall building,considering the correlation of wind load between subtowers and the influence of conjoined structure on frequency vibration mode of conjoined twin tower,the calculation program of equivalent static wind load of conjoined twin tower is compiled.The equivalent static wind load was loaded into the finite element model,and compared with the time-history response of the finite element model,the translational and torsion were in good agreement.更多还原