鋼管再生混凝土柱塑性鉸長(zhǎng)度試驗(yàn)研究*
張向?qū)?,2，陳宗平2，薛建陽(yáng)2
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（1 河南理工大學(xué)土木工程學(xué)院， 焦作 454000； 2 廣西大學(xué)土木建筑工程學(xué)院， 南寧 530004）
［摘要］為研究鋼管再生混凝土柱的塑性鉸長(zhǎng)度，以再生粗骨料取代率、長(zhǎng)細(xì)比、軸壓比和含鋼率為變化參數(shù)，對(duì)10個(gè)圓鋼管再生混凝土柱和6個(gè)方鋼管再生混凝土柱試件進(jìn)行擬靜力試驗(yàn)。根據(jù)試件的破壞形態(tài)、滯回曲線(xiàn)，并基于等效塑性鉸理論，提出壓彎狀態(tài)下圓鋼管再生混凝土柱和方鋼管再生混凝土柱的等效塑性鉸長(zhǎng)度計(jì)算公式。研究結(jié)果表明：鋼管再生混凝土柱破壞形態(tài)與普通鋼管混凝土柱相似，鋼管底部鼓曲破壞，底部的核心再生混凝土被壓碎；鋼管再生混凝土柱滯回曲線(xiàn)比較飽滿(mǎn)，其形狀從梭形發(fā)展到弓形，當(dāng)再生粗骨料的取代率分別為0%，30%，70%，100%時(shí)，試件的滯回曲線(xiàn)受其影響不大；圓鋼管再生混凝土柱等效塑性鉸長(zhǎng)度是其截面高度的0.45～0.95倍，方鋼管再生混凝土柱等效塑性鉸長(zhǎng)度是其截面高度的0.65～0.75倍。［關(guān)鍵詞］圓鋼管再生混凝土柱; 方鋼管再生混凝土柱; 擬靜力試驗(yàn); 等效塑性鉸長(zhǎng)度中圖分類(lèi)號(hào)：TU398 文獻(xiàn)標(biāo)識(shí)碼：A 文章編號(hào)：1002-848X(2015)20-0052-05
Test study on plastic hinge length of recycled aggregate concrete filled steel tube columnZhang Xianggang1,2, Chen Zongping2, Xue Jianyang2(1 School of Civil Engineering, Henan Polytechnic University, Jiaozuo 454000, China; 2 College of Civil Engineering and Architecture, Guangxi University, Nanning 530004, China)Abstract: To study plastic hinge length of recycled aggregate concrete filled steel tube column, quasi-static tests were carried out on specimens including ten recycled aggregate concrete filled circular steel tube columns and six recycled aggregate concrete filled square steel tube columns with different replacement ratios of recycled coarse aggregate, slenderness ratios, axial compression ratios and steel ratios. According to failure mode and the hysteretic curves, computational formulas of equivalent plastic hinge length were proposed for recycled aggregate concrete filled circular steel tube columns and recycled aggregate concrete filled square steel tube columns under compression and bending based on the theory of equivalent plastic hinge. It is shown that the failure modes of specimens are similar to ones of common concrete filled steel tube columns with the buckled steel tube at the bottom and the crushed core recycled aggregate concrete at the bottom. The hysteretic curves are plump and their shapes change from fusiform to arch. When replacement ratio of recycled coarse aggregate is respectively 0%, 30%, 70% and 100%, influence on the hysteretic curves is little. Equivalent plastic hinge lengths of circular specimens are as 0.45～0.95 times high as cross section heights, while ones of square specimens are as 0.65～0.75 times high as cross section heights.Keywords: recycled aggregate concrete filled circular steel tube column; recycled aggregate concrete filled square steel tube column; quasi-static test; equivalent plastic hinge length
*河南省高等學(xué)校重點(diǎn)科研項(xiàng)目（15A560008），河南理工大學(xué)博士基金項(xiàng)目（B2015-72）。作者簡(jiǎn)介：張向?qū)?，博士，講師，Email: xgzhang@hpu.edu.cn。
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