（聊城市规划建筑设计院有限公司， 聊城 252000）

［摘要］对聊城盛世天湖环保科技园温泉馆室外附属馆结构方案设计阶段的关键问题进行了论述。当下部结构平面不规则且超长时，不应按分缝设计，若分缝会造成上部钢结构屋盖的支座支承在动力特性不同的多个下部结构上。按照抗震规范要求，并结合MIDAS/Gen特有的应变能阻尼比计算方法，实现了组合结构阻尼比的正确计算，进而保证了地震作用计算的合理可靠性。针对支托屋盖管桁架的钢柱，利用结构稳定理论给出了稳定方程和简化计算公式。

［关键词］钢结构； 立体桁架； 应变能阻尼比； 稳定方程； 计算长度系数

中图分类号：TU375，TU391文献标识码：A文章编号：1002-848X(2016)13-0025-05

Design and analysis on  structural scheme of the outdoor affiliated pavilion of a SPA center

Zhang Yuming

(Liaocheng Planning Architecture Design Institute, Liaocheng 252000， China)

Abstract:The key issues in the scheme design phase of the outdoor affiliated pavilion of Liaocheng Shengshi Tianhu Environmental Science and Technology Park Spa were discussed. When the lower structure has irregular and super-long plane, the structure should not be designed with joints. The setting of joints will cause the bearings of upper steel roof to be supported on different substructures with different dynamic characteristics. According to seismic code requirements, combined with specific strain energy damping ratio calculation method of MIDAS/Gen, the correct calculation of combined computing structural damping ratio was achieved, thus ensuring the reasonability and reliability of the seismic action calculation. The stability equation and simplified formulas were provided based on structural stability theory for steel columns to support roof pipe truss.

Keywords:steel structure； spatial truss；  strain energy damping ratio； stability equation； effective length factor

作者简介：张玉明，硕士，高级工程师，一级注册结构工程师，Email：zhangym@lcadi.com。