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(北京中聯(lián)環(huán)建文建筑設(shè)計(jì)有限公司，100038)
［提要］根據(jù)現(xiàn)行規(guī)范對抗震框架梁的諸多規(guī)定，提出承載能力極限狀態(tài)考慮地震作用組合的梁端截面最大彎矩限值計(jì)算公式。引入預(yù)應(yīng)力平衡度和預(yù)應(yīng)力荷載平衡度的概念，建立了溝通規(guī)范的裂縫控制驗(yàn)算應(yīng)力差限值與傳統(tǒng)荷載平衡法的數(shù)學(xué)關(guān)系式。給出預(yù)應(yīng)力框架梁及連續(xù)梁(單向板)在正常使用極限狀態(tài)下估算有效預(yù)拉力Npe的直接設(shè)計(jì)法，可在預(yù)應(yīng)力結(jié)構(gòu)初步設(shè)計(jì)階段使用。算例計(jì)算結(jié)果表明，對于柱網(wǎng)均勻的多跨連續(xù)梁或連續(xù)單向板，該法的計(jì)算精度較高。
［關(guān)鍵詞］預(yù)應(yīng)力混凝土框架；抗震設(shè)計(jì)；荷載平衡法；裂縫控制驗(yàn)算
New Design Method of Posttensioned Prestressed Concrete Frame Beam and Continuous Beam(One way Slab)/Zhou Xuqi(Beijing Zhonglianhuan Architecture Design Ltd.,Co.,Beijing 100038,China)
Abstract:Based on the present regulations in the code for the frame structure,the calculation formula of the maximum moment at the beam end and bearing capacity limit state considering the earthquake load combination is put forward.The concepts of prestress equivalent degree and load equivalent degree are introduced.The relation between the difference values of the controlling prestress in the codes and traditional loadbalancing method is set up.The direct calculation method of effective prestress of prestressed concrete frame beam and continuous beam at the normal use limit state is given.The method can be adopted at the preliminary stage for structure design.The results of an example show that, for the continuous beam and oneway slab of frame structure with uniform span,the method has highly precise.
Keywords:prestressed concrete frame; seismic design; loadbalancing method; crackcontrol check calculation