江门体育中心体育场桁架拱基础设计

江门体育中心体育场采用不对称看台，西看台屋盖钢结构由桁架拱、桁架梁以及飘蓬组成。桁架拱跨度266.44m，两端拱脚落地。竖向荷载作用下拱脚的水平推力达14570kN。由于支座水平刚度对桁架拱结构的整体稳定性影响很大，需寻求一种能够承担拱脚水平推力并满足水平刚度要求的基础形式。经比较几种可能的基础方案，确定采用钢筋混凝土地下连续墙箱形基础。采用规范计算公式、现场原位试验以及结构仿真分析，对桁架拱基础水平抗侧刚度进行计算分析。工程竣工后基础的位移监测结果表明，基础的水平刚度满足设计要求。

Foundation design of trussed arch of Jiangmen Sports Centre Stadium

The Jiangmen Sports Centre Stadium consists of asymmetrical stands. The steel roof structure of the west stand consists of trussed arch, trussed beams and cantilevered canopies. The trussed arch spans 266.44m with both sides of arch springing supported on the ground. The arch springing subjects to a horizontal thrust as large as 14570kN. Since the stiffness of the springing support has a significant effect on the integral stability of the trussed arch system, it is necessary to seek a foundation system which is able to withstand the horizontal thrust and, at the same time, satisfies the need of horizontal stiffness. Box diaphragm wall foundation is adopted for the trussed arch system after comparing several potential solutions of foundation. The lateral stiffness of the trussed arch foundation is calculated and analyzed by calculation formula specified in the standard, in-situ test and numerical simulation. The monitored results of displacement show that the horizontal stiffness of the foundation meets the design requirements.