关于明挖隧道闭合框架结构挠度验算的设计思考

Design Thinking about Deflection Checking Calculation of Closed Frame Structure of Open-trench Tunnel

摘要:

随着北京城市副中心的推进建设，地下道路的修建快速发展。以北京城市副中心东六环隧道为工程背景，在弹性地基梁理论基础上，采用MIDAS Gen/Civil计算软件建立二维及三维荷载-结构法模型，对明挖闭合框架结构采用不同规范依据时挠度验算结果进行了对比分析研究，分析结果表明：采用不同规范进行挠度验算时，明挖隧道结构尺寸设计将不尽相同，文章认为采用《混凝土结构设计规范》进行结构设计更为合理，并提出挠度控制的建议，可为相似明挖隧道工程提供有效借鉴。

Abstract:

With the construction of the municipal administrative center in Beijing, the construction of underground road develops rapidly. Taking East Sixth Ring Tunnel in Beijing Municipal Administrative Center as the engineering background, Based on the theory of elastic foundation beam, MIDAS Civil/Gen calculation software is adopted to establish the two-dimensional and three-dimensional load-structure models. The deflection checking results of open-trench closed frame structure are compared and analyzed when the different codes are adopted. The analysis results show that when the different codes are adopted for deflection checking, the structural size design of open-trench tunnel will be different, and it is reasonable to use Code for Design of Concrete Structures for the structural design, and the suggestions of deflection control are put forward, which can provide the effective reference for the similar open-trench tunnel projects.