【摘要】：進(jìn)行了鋼管混凝土多排多列內(nèi)栓釘(群釘)試件的推出試驗(yàn),其中6個(gè)帶栓釘,1個(gè)不帶栓釘,試件參數(shù)為栓釘環(huán)向布置間距、縱向布置間距和排數(shù)。采用ABAQUS軟件建立了三維有限元模型,對(duì)試驗(yàn)結(jié)果進(jìn)行了計(jì)算分析,計(jì)算結(jié)果與試驗(yàn)結(jié)果吻合較好。試驗(yàn)與分析結(jié)果表明:鋼管混凝土群釘推出試件受力全過程由彈性段、彈塑性段、下降段和荷載殘余段組成;沿加載方向,緊鄰栓釘背部的混凝土應(yīng)力為50.1 MPa~68.8 MPa,超過混凝土圓柱體抗壓強(qiáng)度(cf′=50.1 MPa),混凝土發(fā)生較大塑性變形;栓釘根部Mises應(yīng)力最大,最先達(dá)到材料的極限強(qiáng)度,并發(fā)生剪斷破壞;單根栓釘平均抗剪承載力隨著群釘環(huán)向和縱向間距的減小以及排數(shù)的增加而降低,提出了這三個(gè)因素對(duì)單根栓釘平均抗剪承載力的折減系數(shù)計(jì)算公式。為充分利用栓釘抗剪性能,避免混凝土先于栓釘破壞,建議設(shè)計(jì)中栓釘環(huán)向和縱向間距應(yīng)分別不小于3.4倍和4.4倍栓釘直徑。分析表明,環(huán)向間距、縱向間距和排數(shù)三個(gè)因素對(duì)栓釘抗剪承載力的影響彼此獨(dú)立,它們對(duì)群釘抗剪承載力的影響可采用三個(gè)折減系數(shù)相乘的計(jì)算方法。
[Abstract]:The rolling test of multi-row and multi-row internal bolt (group nail) specimens of concrete-filled steel tube (CFST) was carried out. Among them, six were with pin and one was without pin. The parameters of the specimen were ring arrangement spacing, longitudinal arrangement spacing and number of pins. A three-dimensional finite element model is established by using ABAQUS software. The experimental results are calculated and analyzed. The calculated results are in good agreement with the experimental results. The results of test and analysis show that the whole force process of concrete filled steel tubular nails is composed of elastic section, elastic-plastic section, descending section and load residual section. In the direction of loading, the stress of the concrete near the back of the bolt is 50.1 MPa~68.8 MPa, which exceeds the compressive strength of the concrete cylinder (cf'=50.1 MPa), concrete has a large plastic deformation). The Mises stress at the root of the pin is the largest, and the ultimate strength of the material is first reached, and the shear failure occurs. The average shear bearing capacity of single stud decreases with the decrease of ring direction, longitudinal spacing and the number of pins. A formula for calculating the average shear bearing capacity of single bolt is presented. In order to make full use of the shear resistance of the bolt and avoid the failure of concrete before the bolt, it is suggested that the annular direction and the longitudinal spacing of the bolt should be not less than 3.4 times and 4.4 times the diameter of the bolt respectively in the design. The analysis shows that the influence of three factors, namely the circumferential spacing, the longitudinal spacing and the row number, on the shear bearing capacity of the studs is independent of each other, and the influence of these factors on the shear bearing capacity of the group nails can be calculated by using the method of multiplying the three reduction coefficients.
【作者單位】： 福州大學(xué)土木工程學(xué)院;
【基金】：國家自然科學(xué)基金項(xiàng)目(51178118)
【分類號(hào)】：TU398.9

【相似文獻(xiàn)】

相關(guān)期刊論文 前10條

1 余志武;石衛(wèi)華;匡亞川;;銹蝕栓釘力學(xué)性能試驗(yàn)研究[J];中南大學(xué)學(xué)報(bào)(自然科學(xué)版);2014年01期

2 趙靜;石啟印;;新型外包鋼—混凝土組合梁中栓釘應(yīng)力分析[J];淮陰工學(xué)院學(xué)報(bào);2009年01期

3 黃鑫;沈玫;郭阿明;;冷擴(kuò)孔并置入栓釘技術(shù)止裂效果研究[J];工程建設(shè)與設(shè)計(jì);2012年06期

4 匡亞川;余志武;龔匡暉;石衛(wèi)華;;栓釘銹蝕與抗剪承載力試驗(yàn)研究[J];武漢理工大學(xué)學(xué)報(bào)(交通科學(xué)與工程版);2013年02期

5 孫國良;栓釘與焊接設(shè)備及實(shí)用計(jì)算[J];工業(yè)建筑;1986年12期

6 習(xí)耘;焊接栓釘、螺柱及裝置的研究應(yīng)用通過鑒定[J];工業(yè)建筑;1986年12期

7 高容;栓釘拉弧焊機(jī)及其應(yīng)用的研究已通過鑒定[J];工業(yè)建筑;1986年08期

8 常昆;栓釘穿透焊技術(shù)的試驗(yàn)[J];工業(yè)建筑;1988年10期

9 陳炎，

本文編號(hào)：2322412