多拱联合受力结构体系的研究与应用
摘要：新疆哈密市民服务中心采用一种多拱联合受力结构体系，该结构体系由主拱、次拱、水平卧拱、水平桁架、腰桁架及预应力拉梁等组成，其中主拱部分采用非对称拱结构。通过MIDAS Gen软件分别对单主拱、带腰桁架的单主拱、带次拱的双主拱、带次拱及腰桁架的双主拱进行稳定性分析对比，并对三种侧翼抗侧力方案进行力学性能及经济性分析对比，以及对卧拱刚度与结构侧向刚度的关系进行研究，同时进行了整体分析和吊杆作用分析。结果表明，采用多拱联合受力结构体系有利于提高结构的承载力、稳定性以及受力的合理性，在一定程度上实现了结构自平衡、自稳定；在主拱左右两侧采用不同截面的桁架杆件及在轴力较大的拱脚处设置钢管混凝土弦杆的措施可有效提高主拱的安全性和经济性；水平卧拱可有效抵抗大跨度斜面结构的支座推力、水平风压力和温度应力；吊杆的设置对减小腰桁架的竖向位移和杆件内力有显著作用，并可为腰桁架提供杆件截面优化的空间；在设计中需考虑温度影响。
关键词：拱；多拱联合受力结构体系；水平卧拱；稳定性分析；抗侧力；经济性；
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Study and application of multi-arch combined stress structural system
Abstract: The Citizen Service Center of Hami City located in Xinjiang Province adopts a multi-arch combined stress structural system, which is composed of main arch, secondary arch, horizontal arch, horizontal truss, waist truss, and prestressed tensile beam, among which the main arch adopts asymmetric arch structure. Through using MIDAS Gen software, the stability analysis was compared individually of single main arch, single main arch with waist truss, double main arch with secondary arch, double main arch with secondary arch and with waist truss. They were analyzed and compared the mechanical properties and economical efficiency of three kinds of side force resistance schemes. The relationship between the horizontal arch stiffness and the lateral stiffness of the structure were also studied. Besides, the analysis of the whole structure and the the function of suspenders were carried out at same time. The results show that adopting the multi-arch combined stressed structure system is beneficial to improve the bearing capacity, stability and stress-bearing rationality of the structure; and to certain extent, realizes the self-balance and self-stability of the structure. It is also evidently showed that safety and economical efficiency of the main arch can be effectively improved by using truss members of different sections on the left and right sides of the main arch and setting concrete filled steel tube chord members at the foot of the arch with larger axial force. Horizontal arch can effectively resist horizontal thrust of bearings, horizontal wind pressure and temperature stress of large-span inclined plane structure. The installation of suspender plays a significant role in reducing the vertical displacement and member internal force of the waist truss and provides space for waist truss that optimizing the member sections. The influence of temperature on the structure shall be considered in the design.
Keywords: arch; multi-arch combined stress structural system; horizontal arch; stability analysis; lateral resistance; economical efficiency
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