- 摘 要
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（中國建筑科學(xué)研究院建筑結(jié)構(gòu)研究所, 北京 100013）
［摘要］超長混凝土地下結(jié)構(gòu)普遍不設(shè)結(jié)構(gòu)縫，通常采用下列抗裂措施：驗(yàn)算控制截面最大裂縫寬度（僅考慮重力荷載效應(yīng)），預(yù)留溫度后澆帶降低成型收縮拉應(yīng)力，用構(gòu)造配筋與加強(qiáng)混凝土養(yǎng)護(hù)控制溫度裂縫。研究表明，這些常規(guī)抗裂措施的綜合效果難以定量判斷，存在較大不確定性，不能保證此類結(jié)構(gòu)的抗裂性能可滿足抗?jié)B漏、耐久性與正常使用要求。針對此問題，結(jié)合某新建工程，模擬其超長混凝土地下結(jié)構(gòu)澆筑成型步驟、先后澆筑混凝土之間變形差約束作用、各部位構(gòu)件實(shí)際內(nèi)力增加過程，考慮混凝土彈性模量與收縮變形規(guī)律、環(huán)境最大可能降溫、后澆帶構(gòu)造的影響，不考慮混凝土初始缺陷與后期裂縫的影響，用MIDAS軟件進(jìn)行了組合應(yīng)力彈塑性時程分析，以預(yù)測結(jié)構(gòu)實(shí)際抗裂性能，所述計(jì)算方法與結(jié)果可供同類結(jié)構(gòu)設(shè)計(jì)與施工參考。
［關(guān)鍵詞］超長混凝土地下結(jié)構(gòu); 后澆帶; 溫度裂縫; 抗裂設(shè)計(jì); 控制部位; 組合應(yīng)力; 彈塑性時程分析
中圖分類號：TU398.7 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2014)16-0021-05
Elastic-plastic time-history analysis of the combined stress in a super-long concrete underground structure
Pan Li, Zhang Jianlin
(Institute of Building Structures, China Academy of Building Research, Beijing 100013, China)
Abstract: Generally structural gap is not set in super-long concrete underground structures. Common anti-crack measures include using temperature post-casting band to control concrete tension stress in shrinkage, setting detail rebar with careful concrete curing to control temperature cracks and considering only gravity load when checking maximum crack width on control sections. Researches show that comprehensive effects of the common measures are difficult to quantitatively be estimated and lack of validity, and this kind of structure is not ensured to fulfill requirements of anti-leakage, durability and serviceability. In view of the situation, combined with a newly-built project, simulations were made on super-long concrete underground structure casting process, deformation difference constraints effects of successively casted concrete and actual stress increase process of each component. The influence of concrete elasticity modulus, the shrinkage and deformation law, the maximum drop in environment temperature and the post-casting band construction was considered, and the influence of initial defects and later cracks was not considered. The elastic-plastic time-history analysis on the combined stress in concrete was processed by MIDAS calculation program to predict actual anti-crack performance. The calculation method and the results can be referenced by design and construction of similar structures.
Keywords: super-long concrete underground structure; post-casting band; temperature crack; anti-crack design; control region; combined stress; elastic-plastic time-history analysis
作者簡介：潘立，碩士，教授級高級工程師，一級注冊結(jié)構(gòu)工程師，Email: Panlicabr@163.com。
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