大型地下枢纽结构温度与收缩作用分析和控制措施  

Analysis and Control Measures of the Temperature and Contraction Effect of the Large Underground Hub Structure

作　　者：焦忺玥 Jiao Xianyue(China Railway Design Corporation,Tianjin 300142,China)

机构地区：[1]中国铁路设计集团有限公司,天津300142

出　　处：《市政技术》2024年第7期61-68,共8页Journal of Municipal Technology

基　　金：中国铁路设计集团有限公司科技研发课题(2020YY33031)《深圳市大运综合交通枢纽设计关键技术研究》。

摘　　要：针对具有体量大、结构复杂、大面积不规则开洞等特点的地下综合交通枢纽结构,探究了混凝土收缩徐变作用与环境降温作用对其影响的特点,并基于深圳市大运综合交通枢纽地下结构施工全过程和运营使用阶段数值模拟,对温度与收缩作用的计算和施加方式进行了探讨研究,得到了温度与收缩作用单工况下和荷载组合工况下结构构件变形与受力特点,并与不考虑其作用影响的结果进行了比较分析。分析结果表明:温度与收缩作用对结构构件带来的收缩变形是差异化的,尤其在大开洞等结构不规则处;温度与收缩作用对结构构件弯矩、剪力的影响较小,对轴力的影响较为显著,且主要与构件长度、受约束情况等有关,其可使长梁、长板、墙(水平向)等构件明显受拉,且大开洞旁构件受拉更加明显,但对柱、墙(竖向)等竖向承重构件的轴力影响较小。同时,提出有针对性的设计与施工控制措施,对大型枢纽结构计算与设计具有参考和导向意义。Aiming at underground comprehensive trans portation hub structures with large volume,complicated structure,and irregular large-scale holes,the shrinking effect of concrete and the temperature decrease effect of environment on the structure are explored.Based on the entire construction process and the numerical simulation during the operation of Shenzhen Dayun Comprehensive Transportation Hub,the calculation and application methods of temperature and shrinking effect are studied to obtain the deformation and stress characteristics of structure components under the single condition of the temperature or shrinking effect and the combination of all loads.The characteristics are compared with the results without considering temperature and shrinking effect.The results show that components contraction deformation caused by temperature and shrinking effect is differentiated,especially in irregular large-scale holes;Temperature and shrinking effect has less impact on the bending moment and shear force of structural components,but has more obvious impact on the axial force.And it’s mainly related to the length of the component,the constraints etc.;It cause long beams,long plates and walls(horizontal direction)obviously tensioned,and the tension is significantly increased besides large-scale holes;But the effects of the tension on columns,walls and other vertical load-bearing components is less.At the same time,the targeted design and construction control measures are proposed which can provide reference and guidance for calculation and design of comprehensive hub structures.

关 键 词：大型地下枢纽 不规则大开洞 温度应力 混凝土收缩徐变 数值模拟 

分 类 号：TU755.7[建筑科学—建筑技术科学] TU932