- 摘 要
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（1 北京工業(yè)大學建筑工程學院， 北京100124； 2 北京萬興建筑集團有限公司， 北京102600）
［摘要］北京市亦莊移動硅谷創(chuàng)新中心項目2號、3號樓，地上25層，結(jié)構高度101.70m，在24層、93.70m高以上為長懸挑現(xiàn)澆混凝土結(jié)構，該懸挑結(jié)構施工需要具有足夠剛度和承載力的支撐平臺。提出了一種以主體結(jié)構型鋼混凝土柱為支點的高空大懸挑主桁架式鋼模架，進行了1：3縮尺模型的受力性能試驗研究，分析了承載力、剛度、屈服機制及損傷演化過程，利用SAP 2000軟件進行了受力全過程數(shù)值模擬，施工過程中進行了現(xiàn)場監(jiān)測。結(jié)果表明：該平臺采用主桁架式結(jié)構體系，受力合理，具有足夠的剛度和承載力；主體結(jié)構型鋼混凝土柱與主桁架連接節(jié)點工作可靠；數(shù)值模擬所得荷載-位移曲線與試驗結(jié)果符合較好；由試驗結(jié)果按模型律所得原型的最大撓度與現(xiàn)場實測最大撓度符合較好。
［關鍵詞］高空大懸挑；主桁架式；鋼模架；受力性能；試驗研究
中圖分類號：TU323-4文獻標識碼：A文章編號：1002-848X(2021)09-0120-08
Experimental study on mechanical behavior of main truss steel formwork of high-altitude large cantilever
CAO Wanlin1, ZHANG Yuan1, BIAN Jinliang1, LIU Ping1, LI Jinshui2, GAO Teng2
（1 College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China；2 Beijing Wanxing Building Group, Beijing 102600, China）
Abstract:Mobile Silicon Valley Innovation Center Project is located in Yizhuang, Beijing. Building 2 and 3 have 25 floors above ground which are 101.70 meters high. Long cantilever cast-in-place concrete structures are constructed on the 24th floor and above the height of 93.70m. The construction of the cantilever structure requires a supporting platform with sufficient stiffness and bearing capacity. A high-altitude large cantilever main truss steel formwork with the main structural steel concrete column as the fulcrum was proposed. A model mechanical performance test study of its 1:3 scale ratio was completed. The bearing capacity, stiffness, yield mechanism and damage evolution process were analyzed. SAP 2000 software was used to simulate the whole process of force. On-site monitoring was carried out during the construction process. The results show that the platform which adopts the main truss structure system has reasonable force, sufficient stiffness and bearing capacity. The main structural steel reinforced concrete column and the main truss connection joint work reliably. The load-displacement curves obtained by numerical simulation are in good agreement with the test results. According to the test results, the maximum deflection of the prototype obtained by the model law is in good agreement with the maximum deflection of the field.
Keywords:high-altitude large cantilever; main truss; steel formwork; mechanical performance; experimental study
*國家自然科學基金資助項目（51578020）。
作者簡介：曹萬林，博士，教授，博士生導師，Email: caowl@bjut.edu.cn。
