弹簧阻尼支座对体育场钢结构抗连续倒塌的减振分析

阐述了弹簧阻尼支座减振原理,给出了其构造形式,介绍了拆除构件法中采用非线性动力分析方法的计算原理,以第三届亚洲青年运动会体育场钢结构屋盖作为研究对象,对拉杆系统连续失效情况下结构的响应进行分析,研究弹簧阻尼支座对结构抗连续倒塌性能的影响。结果表明:体育场钢结构屋盖的抗连续倒塌能力良好,拉杆系统连续失效结构悬挑端最大竖向位移为387 mm,挠度为1/90,不会导致结构整体倒塌; 构件拆除后,结构立即进入运动状态,结构动能、应变能、悬挑端竖向位移、支座腹杆应力均在拆除瞬间陡增,达到峰值后逐步减小,并随时间增加反复振荡,最后趋于稳定,结构重新达到稳定平衡; 采用非线性动力方法计算的悬挑端竖向位移、关键杆件应力略大于静力分析方法,偏于安全; 弹簧阻尼支座能有效减小结构动力响应,提高结构防连续倒塌能力,其减振效果受弹簧和阻尼共同影响; 当结构采用了弹簧阻尼支座等消能部件时,对结构进行抗连续倒塌分析时应采用非线性动力分析方法考虑消能部件的有利影响。

Vibration Reduction Analysis of Spring Damping Support on Progressive Collapse Resistance ofStadium Steel Structure

The vibration reduction principle of spring damping support was expounded, and its structure form was given. The calculation principle of nonlinear dynamic analysis method used in the demolition component method was introduced. Taking the steel roof of the stadium of the third Asian Youth Games as the research subject, the response of the structure under the progressive failure of the rod system was analyzed. The influence of spring damping support on the progressive collapse resistance of the structure was studied. The results show that the progressive collapse resistance of the steel roof of the stadium is good. The maximum displacement of the cantilever end of the progressive failure structure of the rod system is 387 mm and the deflection is 1/90, which will not lead to the overall collapse of the structure; after the component is removed, the structure enters the motion state immediately. The kinetic energy, strain energy, cantilever end displacement and support abdominal rod stress of the structure increase sharply at the moment of demolition, and gradually decrease after reaching the peak value, and oscillate repeatedly with time, and finally tend to be stable, and the structure reaches a stable equilibrium again. The displacement of cantilever end and the stress of key members calculated by nonlinear dynamic method are slightly larger than those by static analysis method, and the method is safer. The spring damping support can effectively reduce the dynamic response of the structure and improve the anti-progressive collapse ability of the structure, and the damping effect is affected by spring and damping. When the structure adopts energy dissipation components such as spring damping bearings, the dynamic nonlinear analysis method should be used to consider the favorable influence of energy dissipation components.