长沙象山国际幼儿园装配式钢木混合结构关键问题研究

Research on key issues of prefabricated steel-wood combined structure of Changsha Xiangshan International Kindergarten

长沙象山国际幼儿园为湖南首座绿色装配式钢木混合结构示范项目,采用胶合木框架支撑-钢框架混合结构,位于结构中部的钢框架和两侧的胶合木框架支撑结构水平连接,协同受力。对其钢木混合结构、木楼板振动舒适度、中庭网壳和旋转坡道结构、木结构单元房、防火设计进行了研究。结果表明:钢木混合结构整体模型考虑木搁栅楼板实际平面内刚度后,抗侧刚度有明显降低,但考虑木结构节点刚度和木搁栅楼板平面内刚度更多是影响构件内力和节点内力;提出了木楼板人致振动舒适度控制指标,经计算,班级活动室大跨木楼盖舒适度满足要求;对中庭伞状网壳中心圆筒与坡道的连接、结构稳定性、旋转坡道悬挑端舒适度进行专项分析,保证了其安全适用;对木结构单元房和主体构成的叠箱-框架(支撑)结构进行大震非线性时程分析,连接满足大震弹性要求;采取建筑消防设计、结构防火设计、防火构造措施等方法保证了项目防火性能优于规范要求。

Changsha Xiangshan International Kindergarten is the first green prefabricated steel-wood combined structure demonstration project in Hunan.It adopts a hybrid structure of glulam frame support-steel frame.The steel frame located in the middle of the structure and the glulam frame support structures on both sides are horizontally connected and take loads together.Research has been conducted on its steel-wood combined structure,vibration comfort of wooden roof,atrium lattice shell and rotating ramp structure,wooden structure unit room and fire protection design.The results show that overall model of steel-wood combined structure significantly reduces the lateral stiffness after considering the actual in-plane stiffness of the wooden joist floor slab.However,considering the node stiffness of the wooden structure and the in-plane stiffness of the wooden joist floor slab mainly affects the internal forces of the components and nodes.The control index of human-induced vibration of the wooden roof was put forward.After calculation,the comfort level of wooden joist floor slab of class activity room meets the requirements.The connection between the central cylinder of the atrium lattice shell and the rotating ramp,the structural stability and the comfort of the cantilever end of the rotating ramp were specially analyzed to ensure its safety and applicability.The nonlinear time-history analysis of the box-frame(support)structure composed of wooden structure unit and main body was carried out,and the connections meet the elastic requirements of large earthquake.Methods such as architectural fire protection design,structural fire protection design and fire protection construction measures were adopted to ensure that the fire protection performance of the project is better than the code requirements.