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(1 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；2 中國建筑科學(xué)研究院，北京 100013； 3 珠海市晶藝玻璃工程有限公司，珠海 519015)

［摘要］結(jié)合新加坡植物園展覽溫室結(jié)構(gòu)中鑄鋼節(jié)點(diǎn)的初始設(shè)計(jì)方案，對(duì)該鑄鋼節(jié)點(diǎn)進(jìn)行了足尺靜力加載試驗(yàn)和有限元分析，研究了其承載力、剛度、應(yīng)力分布和破壞機(jī)理。材性試驗(yàn)結(jié)果表明，此類鑄鋼材料宜采用線性強(qiáng)化塑性本構(gòu)模型。通過比較試驗(yàn)和有限元分析得到的節(jié)點(diǎn)荷載-撓度曲線以及應(yīng)力分布可以得出，有限元計(jì)算與試驗(yàn)結(jié)果吻合良好，文中建立的有限元模型能夠很好地分析鑄鋼節(jié)點(diǎn)的受力性能。基于研究結(jié)果對(duì)該類鑄鋼節(jié)點(diǎn)的設(shè)計(jì)提出了建議，為實(shí)際工程應(yīng)用提供了參考。

［關(guān)鍵詞］鑄鋼節(jié)點(diǎn)；足尺試驗(yàn)；非線性分析；本構(gòu)關(guān)系

Experiments on the behavior of cross-shaped cast steel joints in reticulated shell structures

Shi Gang1, Luo Cui2, Wang Yuanqing1, Shi Yongjiu1, Li Guoxing3

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

Engineering, Tsinghua University, Beijing 100084, China; 2 China Academy of Building Research, Beijing 100013,

China; 3 Zhuhai King Glass Engineering Co., Ltd., Zhuhai 519015, China)

Abstract:Based on the design of cast steel joints used in exhibition greenhouse at Gardens by the Bay in Singapore, full-scale static loading test and finite element analysis(FEA) were carried out to study the mechanical behavior. The material test results show that the elastic-linear hardening plastic constitutive model is more suitable for this cast steel material. By comparing the load-deflection curves and the stress distribution of the test and FEA, the two results were in good agreement with each other and the FEA model could well simulate the behavior of the cast steel joints. Some suggestions for the design of this cast steel joints were put forward which can provide reference for practical engineering application.

Keywords:cast steel joint; full-scale experiment; nonlinear analysis; constitutive relation

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