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（中國(guó)建筑西南設(shè)計(jì)研究院有限公司， 成都 610041）

［摘要］采用CEB-FIP（1990）規(guī)范中的混凝土收縮徐變模型，考慮含鋼率、套箍效應(yīng)對(duì)混凝土收縮徐變的影響，計(jì)算了某超高層巨型混合結(jié)構(gòu)豎向構(gòu)件的豎向變形，分析彈性模量發(fā)展對(duì)豎向構(gòu)件變形的影響，并研究豎向變形差對(duì)關(guān)鍵構(gòu)件的內(nèi)力影響。為實(shí)現(xiàn)在設(shè)定階段豎向構(gòu)件達(dá)到設(shè)計(jì)標(biāo)高，對(duì)樓層標(biāo)高預(yù)留高度和豎向構(gòu)件下料預(yù)留長(zhǎng)度的控制方法進(jìn)行了研究。進(jìn)一步提出減小豎向構(gòu)件豎向變形差的措施，并通過(guò)算例驗(yàn)證了其有效性。研究表明，混凝土彈性模量發(fā)展對(duì)豎向構(gòu)件變形影響不大；而混凝土的收縮徐變對(duì)超高層混合結(jié)構(gòu)的變形及內(nèi)力影響較大，應(yīng)以考慮了混凝土收縮徐變的結(jié)構(gòu)模型作為地震分析的初始態(tài)對(duì)關(guān)鍵構(gòu)件進(jìn)行校核；在帶鋼管混凝土柱的超高層巨型混合結(jié)構(gòu)中，控制鋼管混凝土柱壓應(yīng)力水平適當(dāng)大于鋼筋混凝土核心筒的壓應(yīng)力水平，可有效降低混凝土收縮徐變引起的豎向變形差及附加內(nèi)力。

［關(guān)鍵詞］超高層巨型混合結(jié)構(gòu)； 收縮徐變； 豎向變形差； 樓層預(yù)留高度； 豎向構(gòu)件下料預(yù)留長(zhǎng)度； 壓應(yīng)力水平

中圖分類(lèi)號(hào)：TU398-2文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)01-0044-08

Influence and control of concrete shrinkage and creep on vertical deformation and internal forces of key components of super high-rise mega hybrid structures

Zhao Jian, Zhou Dingsong, Zhou Jia, Xiao Kejian, Feng Zhongwei, Zhang Hengfei

(China Southwest Architectural Design & Research Institute Corp., Ltd.，Chengdu 610041，China)

Abstract:Using the concrete shrinkage and creep model in CEB-FIP (1990) specification, considering the influence of steel content and hoop effect on concrete shrinkage and creep, the vertical deformation of a super high-rise mega hybrid structure vertical components was calculated, and the influence of elastic modulus development on the deformation of vertical components was analyzed, and the influence of vertical deformation difference on the internal forces of key components was studied. In order to achieve the design elevation of the vertical components in the set phase, the control method of the reserved height of the floor elevation and the reserved length of the vertical component blanking was studied. Further measures to reduce the vertical deformation difference of vertical components were proposed, and the effectiveness was verified by an example. The research shows that the development of concrete elastic modulus has little effect on the deformation of vertical components. However, the shrinkage and creep of concrete have great influence on the deformation and internal forces of super high-rise hybrid structures. The structural model considering concrete shrinkage and creep should be used as the initial state of seismic analysis to check the key components. In the super high-rise mega hybrid structure with concrete filled steel tube column, the compressive stress of concrete filled steel tube column is controlled to be larger than that of reinforced concrete corewall, which can effectively reduce the vertical deformation difference and additional internal force caused by concrete shrinkage and creep.

Keywords:super high-rise mega hybrid structure; shrinkage and creep; vertical deformation difference; reserved height of floor; reserved length of vertical component blanking; compressive stress level

通訊作者：周定松，博士，教授級(jí)高級(jí)工程師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email:zhoudingsong@163.com。