大跨高比大跨度鋼筋混凝土樓面梁設(shè)計與試驗
趙毅強1) ，柯長華1)， 程懋堃１) ，錢稼茹2)，趙作周2)，戴夫聰2)，黃小坤3)等
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［提要］北京金地中心工程塔樓A，B為滿足建筑凈高要求，采用了跨度為12.245m和10.225m，兩端為簡支的鋼筋混凝土樓面次梁，跨高比分別達到20.4和22.7。介紹了該大跨高比且大跨度樓面次梁的設(shè)計。為研究該樓面梁的剛度及開裂性能，進行了足尺構(gòu)件試驗，按有關(guān)規(guī)范進行了計算。結(jié)果表明，該樓面梁的裂縫寬度及撓度均小于規(guī)范限值。根據(jù)試驗結(jié)果，對設(shè)計和施工提出了有針對性的建議。該工程主體結(jié)構(gòu)已完成施工，未發(fā)現(xiàn)其樓面次梁有顯著可見的裂縫。［關(guān)鍵詞］鋼筋混凝土樓面次梁；大跨高比；足尺構(gòu)件試驗；裂縫寬度；撓度Design and Test of Large Span-to-height Ratio and Large Span RC Floor Beams/Zhao Yiqiang1，Ke Changhua1，Cheng Maokun1，Qian Jiaru2，Zhao Zuozhou2，Dai Fucong2，Huang Xiaokun3，Liu Weimin4，Tong Xiao ou5，Liu Zheng5/(1 Beijing Institute of Architectural Design, Beijing 100045,China；2 Department of Civil Engineering, Tsinghua University, Beijing 100084,China； 3 China Academy of Building Research, Beijing 100027,China； 4 China Construction First Group Fifth Construction Company, Beijing 100024,China； 5 Beijing Goldfield Development Co., Ltd., Beijing 100026，China)Abstract: To satisfy the clear height requirement, the span to height ratios of 20.4 and 22.7 were adopted for the simply supported reinforced concrete secondary floor beams with span of 12.245m and 10.225m respectively for tower A and B of Beijing Goldfield Center. The design of these large span to height ratio and large span secondary floor beams is presented. To study the behavior of the secondary beams under the serviceability limit state, field test of a full scale specimen was carried out and calculation was performed according to design codes. The results show that both crack width and vertical deflection can meet the code requirements. Based on the test results, recommendations are presented for design and construction. The structures of tower A and B have been completed and no obvious cracks on the secondary floor beams have been found.Keywords: RC secondary beam； large span to height ratio； full scale specimen test； crack width; deflection1)北京市建筑設(shè)計研究院，100045；2)清華大學(xué)土木工程系，北京，100084；3)中國建筑科學(xué)研究院，北京，100027；4)中國建筑第一工程局第五建筑公司，北京，100024；5)北京金地鴻業(yè)房地產(chǎn)開發(fā)有限公司，100026。
