方鋼管再生混凝土長柱偏心受壓力學(xué)性能研究*
徐羊，姚勇，張兆強(qiáng)，陳代果
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（西南科技大學(xué)土木工程與建筑學(xué)院， 綿陽 621010）
［摘要］以長細(xì)比及偏心距為主要變化因素，對8個方鋼管再生混凝土長柱試件進(jìn)行偏心受壓單調(diào)加載試驗。通過觀察試件破壞形態(tài)，利用獲取的荷載-位移曲線、荷載-應(yīng)變曲線及試件承載力等重要數(shù)據(jù)，分析方鋼管再生混凝土長柱偏心受壓工作機(jī)理，并討論上述因素對試件極限承載力及破壞形態(tài)的影響，最后利用國內(nèi)常用的鋼管混凝土規(guī)范所推薦的壓彎構(gòu)件承載力計算方法進(jìn)行承載力理論計算，并與試驗結(jié)果進(jìn)行對比。研究表明：方鋼管再生混凝土長柱偏心受壓試件的受力過程、破壞形態(tài)、變形特性等與普通鋼管混凝土相似，試件承載力隨長細(xì)比和偏心距的增大而減小，最終破壞形態(tài)主要為整體失穩(wěn)破壞，部分試件為材料強(qiáng)度破壞；根據(jù)規(guī)程GJB 4142—2000所計算承載力與試驗結(jié)果吻合較好。［關(guān)鍵詞］鋼管再生混凝土; 長柱; 偏心受壓; 力學(xué)性能中圖分類號：TU375 文獻(xiàn)標(biāo)識碼：A 文章編號：1002-848X(2016)09-0069-06
Experimental research on mechanical behavior of recycled aggregate concrete filled square steel tubular long columns under eccentric compression loadingXu Yang, Yao Yong, Zhang Zhaoqiang, Chen Daiguo(School of Civil Engineering and Architecture, Southwest University of Science and Technology, Mianyang 621010, China)Abstract: To take slenderness ratio and eccentricity as main variable factors, eccentric compression monotonic loading test was carried out on 8 recycled aggregate concrete filled square steel tubular long columns. By observing the specimens failure modes, using load-displacement curves, load-strain curves and the bearing capacity of specimens analyzed mechanics behavior of recycled aggregate concrete filled square steel tubular long columns under eccentric compression. The influence of the test parameters on the ultimate bearing capacity and failure modes of specimens were discussed. At last, the standards for concrete filled steel tube which are wildlly used in China were used to calculate compression-bending members' theoretical bearing capacity. The calculation results were analyzed and compared with measured results. It is shown that the recycled aggregate concrete filled square steel tubular long columns under eccentric compression have similar characteristics to normal concrete filled steel tube columns in loading process, failure modes and deformation features. The bearing capacity of specimens decreases as slenderness ratio and eccentricity increase. The final failure mode mainly is overall instability damage, part of the specimens are materials strength failure. The bearing capacity of the specimens calculated according to the standard GJB 4142-2000 is in good agreement that with the experimental results.Keywords: recycled aggregate concrete filled steel tube; long column; eccentric compression; mechanical property
*國家自然基金資助項目(51308479)，四川省教育廳資助項目(13ZB0179)，西南科技大學(xué)研究生創(chuàng)新基金資助項目(15ycx097)。作者簡介：徐羊，碩士研究生，Email:xuyang2536@126.com。
