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(土木工程安全與耐久教育部重點(diǎn)實(shí)驗(yàn)室，清華大學(xué)土木工程系，北京 100084)

［摘要］點(diǎn)支式玻璃幕墻單層索網(wǎng)的地震反應(yīng)由于受幾何非線性和主體結(jié)構(gòu)的影響，其抗震計(jì)算更加復(fù)雜。目前抗震規(guī)范采用簡(jiǎn)單的等效靜力法計(jì)算，地震影響系數(shù)亦取線性體系地震影響系數(shù)的最大值，未能考慮幾何非線性體系結(jié)構(gòu)動(dòng)力反應(yīng)的特點(diǎn)，同時(shí)也未考慮主體結(jié)構(gòu)的影響，與實(shí)際情況嚴(yán)重不符。對(duì)點(diǎn)支式玻璃幕墻單層索網(wǎng)地震反應(yīng)的模態(tài)參與特性研究表明，其地震反應(yīng)以第1階模態(tài)為主，且考慮其質(zhì)量剛度的均勻分布特性，參考抗震規(guī)范中的底部剪力法提出了改進(jìn)等效靜力法，并通過(guò)對(duì)一組典型索網(wǎng)模型的計(jì)算分析驗(yàn)證了此方法的合理性。提出相應(yīng)的地震影響系數(shù)可由線性周期和幾何非線性因子控制的單自由度體系求得。大量的分析計(jì)算結(jié)果表明，主體結(jié)構(gòu)動(dòng)力影響系數(shù)反映主體結(jié)構(gòu)二次輸入的影響，其值可通過(guò)二者的基本頻率比值求得。

［關(guān)鍵詞］點(diǎn)支式玻璃幕墻；單層索網(wǎng)；抗震計(jì)算；幾何非線性；主體結(jié)構(gòu)；實(shí)用方法

Seismic analysis method for point-supported glass curtain wall with single-layer cable net

Shi Yongjiu， Li Yong， Wang Yuanqing

(Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,

Department of Civil Engineering, Tsinghua University, Beijing 100084, China)

Abstract:Due to the influence of geometric nonlinearity of cable net and the second input from the primary structures, seismic analysis for point-supported glass curtain wall with single-layer cable net is more complex. While the current design codes rarely take these effects into account with simple equivalent static method, in which the seismic coefficient is taken as the peak value of linear structures. And it is also unrealistic by ignoring the influence of primary structure. Based on the mode participation properties of cable net under earthquake,it suggests that the first mode is predominant. Combined with the characteristic of even distribution of mass and stiffness of cable net, modified equivalent static method was proposed with validity after comparison with other methods. As for the nonlinear seismic influence coefficient, it can be obtained from the equivalent single-degree-of-freedom with the same linear period and geometric nonlinearity factor. The influence of primary structure can be taken into account with its dynamic influence factor, which varies from the ratio of basic frequency between primary structure and cable net.

Keywords:point-supporting glass curtain wall; single-layer cable net; seismic analysis; geometric nonlinearity；primary structure