| 引用本文: | 王万祯,李华,吴晓聪,倪威康.高强方钢管轻骨料混凝土桁架加劲T型节点试验[J].哈尔滨工业大学学报,2020,52(8):103.DOI:10.11918/201901172 |
| WANG Wanzhen,LI Hua,WU Xiaocong,NI Weikang.Tests on T-joints with stiffening plates of lightweight aggregate concrete-filled high strength steel square tube truss[J].Journal of Harbin Institute of Technology,2020,52(8):103.DOI:10.11918/201901172 |
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| 摘要: |
| 为考察支主管间设置的加劲板构造和支主管截面宽度比对高强方钢管轻骨料混凝土桁架T型节点破坏模式、承载力、连接区应力和应变的分布及演化等受力性能的影响,对加劲节点和常规节点进行了支管轴压静力加载试验.试验结果表明:高强方钢管轻骨料混凝土桁架T型节点的典型破坏模式有连接区主管受压上翼缘凹陷、主管腹板凸曲、主管弯曲、支管侧倾失稳、加劲板屈曲、支主管焊缝开裂和加劲板与支管焊缝开裂等.常规节点的承载力取决于支管根部及其焊缝的承载强度和连接区主管上翼缘的局部承压强度,其荷载-位移曲线形成流塑平台.加劲节点的承载力取决于包括加劲板扩散效应的支管根部及其焊缝的承载强度、连接区主管上翼缘扩散承压强度和加劲板屈曲强度,其荷载-位移曲线呈渐变上升趋势,没有屈服平台.加劲板明显提高了T型节点的承载力,加劲节点的屈服承载力和极限承载力较常规节点分别提高10.0%~40.0％和15.0％~48.3％,加劲节点的承载力随支主管截面宽度比的增加而提高. |
| 关键词: T型节点 高强方钢管 轻骨料混凝土 加劲板 试验 承载力 |
| DOI：10.11918/201901172 |
| 分类号:TU391 |
| 文献标识码:A |
| 基金项目:国家自然科学基金(51878360)；浙江省基础公益技术研究计划(LGF18E080007)；宁波市领军和拔尖人才工程项目 |
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| Tests on T-joints with stiffening plates of lightweight aggregate concrete-filled high strength steel square tube truss |
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WANG Wanzhen,LI Hua,WU Xiaocong,NI Weikang
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(School of Civil and Environmental Engineering, Ningbo University, Ningbo 315211, Zhejiang, China)
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| Abstract: |
| To study the effect of the stiffening plates between brace and chord and the width ratio of brace section to chord section on failure mode, bearing capacity, and distribution and evolution of stress and strain in connection zone of T-joints of lightweight aggregate (LWA) concrete-filled high strength steel square tube truss, static loading tests under axial compression on brace were performed on T-joint with stiffening plates and traditional T-joint. Tests results show that typical failure modes of T-joints of LWA concrete-filled high strength steel square tube truss included concave of top flange of chord in connection zone, convex of chord webs, bending of chord, lateral instability of brace, buckling of stiffening plates, crack of weld between chord and brace, and crack of weld between stiffening plates and brace. The bearing capacity of the traditional T-joint depended on the compressive strength of brace root and its welds and the local compression zone of top flange of chord in connection zone, and there was a flow-plastic platform in the load-displacement curve of the traditional T-joint. The bearing capacity of the stiffened T-joints depended on the compressive strength of brace root and its welds, the diffusion compression zone of top flange of chord in connection zone, and the buckling strength of stiffening plate. The load-displacement curves of the stiffened T-joint showed gradual upward trend without flow-plastic platform. The bearing capacity of the T-joints was obviously improved by the stiffening plates. The yield load and ultimate bearing capacity of the stiffened joints increased by 10.0%-40.0% and 15.0%-48.3% compared with those of the traditional T-joint, respectively. The yield load and ultimate bearing capacity of the stiffened joints increased with the increase of the width ratio of brace section to chord section. |
| Key words: T-joint high strength steel square tube lightweight aggregate concrete stiffening plate test bearing capacity |
