884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

（1 同濟(jì)大學(xué)建筑工程系， 上海 200092； 2 上海風(fēng)暢土木工程技術(shù)有限公司， 上海 201799）

［摘要］由于運(yùn)輸條件的限制，某些位于偏遠(yuǎn)山區(qū)的風(fēng)電項(xiàng)目無(wú)法采用商品混凝土，而現(xiàn)場(chǎng)攪拌的混凝土因質(zhì)量難以達(dá)標(biāo),出現(xiàn)了強(qiáng)度過(guò)低導(dǎo)致的基礎(chǔ)環(huán)基礎(chǔ)開(kāi)裂、壓碎和剛度降低等現(xiàn)象。針對(duì)上述問(wèn)題，對(duì)基礎(chǔ)環(huán)基礎(chǔ)提出了一種環(huán)向預(yù)應(yīng)力加固方案，即在柱墩側(cè)壁設(shè)置鋼絞線，通過(guò)施加環(huán)向預(yù)應(yīng)力減小基礎(chǔ)柱墩的受拉區(qū)域，使柱墩處于三向受壓狀態(tài)，充分發(fā)揮混凝土受壓性能良好的特點(diǎn)，限制基礎(chǔ)混凝土裂縫的進(jìn)一步發(fā)展。并以某風(fēng)力發(fā)電塔基礎(chǔ)為例，建立精細(xì)化有限元模型，分析了混凝土未達(dá)到設(shè)計(jì)強(qiáng)度的基礎(chǔ)在加固前后的應(yīng)力狀態(tài)和應(yīng)變分布。分析結(jié)果表明，環(huán)向預(yù)應(yīng)力加固方案能夠有效減小基礎(chǔ)裂縫寬度和因受拉、壓產(chǎn)生的塑性區(qū)域，顯著提高基礎(chǔ)剛度，加固效果顯著，對(duì)同類工程的加固處理有一定參考價(jià)值。

［關(guān)鍵詞］風(fēng)電機(jī)組； 基礎(chǔ)環(huán)基礎(chǔ)； 混凝土低強(qiáng)； 環(huán)向預(yù)應(yīng)力； 有限元方法

中圖分類號(hào)：TU470+.3文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2019)10-0119-06

Research on strengthening measure of low-strength concrete for embedded-ring foundation of wind turbine tower

Chen Junling1， Zhang Youchen1， Feng Youquan2

(1 Department of Structural Engineering， Tongji University， Shanghai 200092， China；2 Shanghai Fengchang Civil Engineering Technology Co.， Ltd.， Shanghai 201799， China)

Abstract:Due to the limitation of transportation conditions, some wind power projects located in remote mountainous areas cannot use commercial concrete, while the concrete mixing on site is difficult to meet the quality standards, resulting in cracking, and crushing and stiffness reduction of embedded-ring foundation caused by low strength. In view of the above problems, a reinforcing scheme was put forward using embedded-ring foundation with circular prestress, that is, setting steel strands on the side wall of the pier, reducing the tension area of the pier by applying circular prestress. This can make the pier in a three-dimensional compression state, giving full play to the good compressive performance of concrete, and restricting the further development of concrete cracks in the foundation. Taking the foundation of a wind power tower as an example, a refined finite element model was established, and the stress state and strain distribution of the foundation before and after strengthening were analyzed. The analysis results show that the circular prestress reinforcement scheme can effectively reduce the crack width of the foundation and the plastic area under tension and compression, significantly improve the foundation stiffness, and the reinforcement effect is remarkable, which has a certain reference value for the reinforcement treatment of similar projects.

Keywords:wind turbine tower; embedded-ring foundation; low-strength concrete; circular prestress; finite element method

作者簡(jiǎn)介：陳俊嶺，博士，教授，博士生導(dǎo)師，一級(jí)注冊(cè)結(jié)構(gòu)工程師，Email：chenjl@#edu.cn。