(中国建筑科学研究院建筑结构研究所，  北京 100013)

［摘要］国内大型综合体建筑群常配建超长混凝土地下结构，其超长程度远大于相关规范限值要求，但目前结构设计普遍仅凭概念、假定、经验和常规构造措施控制混凝土成型收缩裂损，且缺少对各项抗裂措施预期综合效果的验算复核，导致此类结构的抗裂损渗漏性能和耐久性能均存在较大不确定性。邯郸环球中心项目的超长混凝土地下结构东西方向总长为580m，南北方向总宽为108m，裙房区域为混凝土筏板基础，施工期间地下结构出现了较严重裂损渗漏，其中筏板的温度后浇带与沉降后浇带部位裂损渗漏尤为明显，针对此问题采取了相应封堵措施。结合邯郸环球中心项目的超长混凝土地下结构施工期间裂损渗漏实例，基于地下结构整体模型，模拟该结构实际成型过程，取其混凝土各时段的强度与弹性模量为龄期的函数，进行结构成型收缩拉应力弹塑性时程分析，依此验算复核了该地下结构施工期间主要抗裂措施的有效性，有限元分析数据与裂缝检测结果基本相符，所述计算方法和技术分析可为同类结构抗裂设计提供参考。

［关键词］邯郸环球中心； 超长混凝土地下结构；筏板与地下结构外墙；混凝土成型收缩；拉应力与名义拉应力；温度后浇带；膨胀加强带

中图分类号：TU375文献标识码：A文章编号：1002-848X(2021)04-0058-07

Finite element elastoplastic time-history analysis for crack causes in super-long concrete underground structure of Handan Global Center during construction period

PAN Li

(Institute of Building Structures, China Academy of Building Research, Beijing 100013, China)

Abstract:The super-long concrete underground structure of large complex buildings in China is much longer than the limit value requirement of relevant regulations. However, at present, structural design generally controls shrinkage crack damage of concrete forming only by concept, experience, assume with using conventional structural measures, also is a lack of checking calculation for the expected comprehensive effect of various anti-crack measures, which leads to more uncertainty of anti-crack leakage and durability of such structures. The total east-west length of the super-long concrete underground structure of Handan Global Center project is 580m, its total north-south width is 108m, and the podium area is set as the reinforced concrete raft foundation. During the construction period, local areas of the underground structure appeared serious crack and leakage, especially in the temperature post-pouring zone of raft and near settlement post-pouring zone, and corresponding crack sealing measures were taken to solve these problems. Based on the example of crack and leakage during construction of super-long concrete underground structure in Handan Global Center project, the actual forming process of the structure was simulated based on the integral model of underground structure, and the strength & elastic modulus of the concrete in each period were taken as function of its age to conduct elastoplastic time-history analysis for shrinkage tensile stress of the structure forming. Based on this calculation, effectiveness of the main anti-crack measures during its construction of the underground structure was checked. The finite element analysis data was basically consistent with the crack detection results. The calculation method and technical analysis in this paper could be as reference for the anti-crack design of similar structures.

Keywords:Handan Global Center; super-long  concrete underground structure;raft and external wall in underground structure;concrete forming shrinkage;tensile stress and nominal tensile stress;temperature post-pouring zone;expansion strengthening zone

作者简介：潘立，硕士，教授级高级工程师，一级注册结构工程师，Email: Panlicabr@163.com。