我國(guó)“強(qiáng)柱弱梁”措施表達(dá)式影響因素分析*
楊紅1，徐云中2，孫永煒3，白紹良1
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(1 重慶大學(xué)土木工程學(xué)院，重慶 400045； 2 蘇州市天地民防建筑設(shè)計(jì)研究院有限公司，蘇州 215006； 3 重慶市設(shè)計(jì)院，重慶 400015)
［摘要］對(duì)于按中國(guó)規(guī)范分別設(shè)計(jì)的位于不同設(shè)防烈度分區(qū)、不同抗震等級(jí)的2個(gè)空間框架和5個(gè)平面框架，通過(guò)考察各節(jié)點(diǎn)的四類彎矩比計(jì)算結(jié)果，討論了樓層位置、烈度區(qū)、梁跨度、現(xiàn)澆板鋼筋、梁底縱筋“超配”等因素對(duì)“強(qiáng)柱弱梁”措施的影響規(guī)律。結(jié)果表明，采用《建筑抗震設(shè)計(jì)規(guī)范》（GB 50011—2010）式(6.2.2-1)進(jìn)行“強(qiáng)柱弱梁”調(diào)整時(shí)，低烈度區(qū)框架應(yīng)同時(shí)考慮現(xiàn)澆板鋼筋、梁底縱筋“超配”的影響，高烈度區(qū)框架可主要考慮現(xiàn)澆板鋼筋的影響；確定現(xiàn)澆板鋼筋的增強(qiáng)幅度、梁底縱筋的“超配”幅度時(shí)均需考慮烈度區(qū)、樓層位置、梁跨度的影響。［關(guān)鍵詞］鋼筋混凝土; 框架結(jié)構(gòu); 強(qiáng)柱弱梁; 柱端彎矩增大系數(shù)中圖分類號(hào)：TU375 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2015)12-0028-06
Analysis on factors influencing the mathematical formula of strong columnweak beam measures in ChinaYang Hong1, Xu Yunzhong2, Sun Yongwei3, Bai Shaoliang1(1 College of Civil Engineering, Chongqing University, Chongqing 400045, China; 2 Suzhou Tiandi Civil Defence Architecture Design & Research Institute Co., Ltd., Suzhou 215006, China; 3 Chongqing Architecture Design Institute, Chongqing 400015, China)Abstract:Two RC space frames and five RC plane frames in different earthquake intensity regions and with different seismic precautionary criteria were designed according to Chinese code. The influencing laws of the floor location, earthquake intensity region, span of beam, reinforcement of cast-in-place slab and over-reinforced bottom longitudinal bars of beam on the strong column-weak beam measures were discussed based on the calculating results of four types of bending moment ratios of each node. The results show that when formula (6.2.2-1) in Code for seismic design of buildings (GB 50011-2010) was adopted for the strong column-weak beam measures, the effect of reinforcements of cast-in-place slab and over-reinforced bottom longitudinal bars of beam should be considered for the frames in lower earthquake intensity regions, while the effect of reinforcements of cast-in-place slab should be mainly considered for the frames in higher earthquake intensity regions. The influences of earthquake intensity region, floor location and span of beam should be considered when the increase range of reinforcements of cast-in-place slab and over-reinforced bottom longitudinal bars of beam were determined.Keywords:reinforced concrete; frame structure; strong columnweak beam; moment amplification factor of column end
*國(guó)家自然科學(xué)基金資助項(xiàng)目（51178487）。作者簡(jiǎn)介：楊紅，博士，教授，博士生導(dǎo)師，Email: yangh@cqu.edu.cn。
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