884aa四虎影成人精品,99久久国产综合精品女图图等你,97在线观看永久免费视频,久久精品国产精品亚洲38,ⅵdeodesetv性欧美

（1 山東建筑大學(xué)工程鑒定加固研究院， 濟(jì)南 250013；  2 建筑結(jié)構(gòu)加固改造與地下空間工程教育部重點(diǎn)實(shí)驗(yàn)室， 濟(jì)南 250101）

［摘要］為了對(duì)剛接約束下現(xiàn)澆組合梁的抗火性能進(jìn)行研究，現(xiàn)對(duì)剛接約束下的現(xiàn)澆組合梁進(jìn)行了恒載升溫試驗(yàn)研究和數(shù)值模擬。在試驗(yàn)過(guò)程中，對(duì)試驗(yàn)現(xiàn)象進(jìn)行了詳細(xì)的觀察記錄，對(duì)現(xiàn)澆組合梁的溫度分布和位移變化進(jìn)行了測(cè)量。通過(guò)分析試驗(yàn)數(shù)據(jù)發(fā)現(xiàn)，現(xiàn)澆板的溫度分布沿板厚方向逐漸降低，板底溫度最高，40mm以下區(qū)域受火影響最為明顯?，F(xiàn)澆板會(huì)延緩鋼梁上翼緣溫度的升高，由于溫度梯度的影響，現(xiàn)澆板會(huì)約束鋼梁的變形； 現(xiàn)澆板由于溫度應(yīng)力和荷載彎矩的影響，在板頂沿中軸線方向出現(xiàn)貫穿板面的裂縫，冷卻后現(xiàn)澆組合梁有較強(qiáng)的變形恢復(fù)能力。剛接約束下現(xiàn)澆組合梁的模擬結(jié)果與試驗(yàn)結(jié)果符合較好，驗(yàn)證了數(shù)值模擬的正確性與可行性。

［關(guān)鍵詞］現(xiàn)澆組合梁； 剛接約束； 抗火性能； 端板連接； 數(shù)值模擬

中圖分類號(hào)：TU398-9文獻(xiàn)標(biāo)識(shí)碼：A文章編號(hào)：1002-848X(2020)06-0015-06

Experimental study and numerical simulation on fire-resistance performance of cast-in-place composite beams

Li Ying1,2, Lü Junli1,2, Cai Yongyuan1, Lü Jingjing1, Zhong Chongqiang1

（1 Engineering Research Institute of Appraisal and Strengthening, Shandong Jianzhu University, Jinan 250013, China;2 Key Lab of Building Structural Retrofitting and Underground Space Engineering(Shandong Jianzhu University), Ministry of Education, Jinan 250101, China)

Abstract:In order to study the fire\|resistance performance of cast-in-place composite beams with rigid joint constraints, the temperature rise experiment and numerical simulation of the cast-in-place composite beams with rigid joint constraints were carried out. In the process of the experiment, the experiment phenomenon was observed and recorded in detail, and the temperature distribution and displacement change of the cast-in-place composite beam were measured. Through the analysis of the experimental data, it is found that the temperature distribution of the cast-in-place slab decreases gradually along the direction of the slab thickness, the temperature at the slab bottom is the highest, and the area below 40mm is most affected by the fire. The cast-in-place slab will delay the temperature rise of the upper flange of the steel beam. Due to the influence of the temperature gradient, the cast-in-place slab will restrain the deformation of the steel beam. Due to the influence of the temperature stress and the load bending moment, the cracks across the slab surface appear at the top along the central axis direction, and the cast-in-place composite beam has strong deformation recovery ability after cooling. The simulation results of cast-in-place composite beams with rigid joint constraints are in good agreement with the experiment results, which verifies the correctness and feasibility of the numerical simulation.

Keywords:cast-in-place composite beam; rigid joint constraint; fire\|resistance performance; end plate connection; numerical simulation

*國(guó)家自然科學(xué)基金項(xiàng)目(51878398)。

作者簡(jiǎn)介：李瑩，碩士，高級(jí)工程師,Email:liying@sdjzu.edu.cn。