| 张玉，吴涛，王立勋.轻骨料混凝土深受弯构件压杆隔离体开裂软化性能试验研究[J].,2021,61(4): |
| 轻骨料混凝土深受弯构件压杆隔离体开裂软化性能试验研究 |
| Experimental study of cracking softening performance of strut isolation specimen in lightweight aggregate concrete deep flexural member |
|
| DOI：10.7511/dllgxb202104007 |
| 中文关键词:轻骨料混凝土深受弯构件拉-压杆模型压杆隔离体软化系数 |
| 英文关键词:lightweight aggregate concretedeep flexural memberstrut and tie modelstrut isolation specimensoftening coefficient |
| 基金项目:国家自然科学基金资助项目(52078042,51878054). |
|
| 摘要点击次数:176 |
| 全文下载次数:148 |
| 中文摘要: |
| 完成了11个不同参数的轻骨料混凝土深受弯构件斜压杆隔离体试件轴压性能试验，系统研究了其破坏过程、荷载-位移曲线、破坏形态以及钢筋混凝土应变等；深入分析了压杆腹筋配筋率、高厚比对该类构件有效抗压强度系数及破坏形态的影响；评估了EC2规范、ACI 318-19规范、Model Code 2010规范等的拉-压杆模型及****提出的斜压杆承载力计算模型对该类构件的适用性与准确性．计算结果表明：轻骨料混凝土深受弯构件斜压杆主要发生压杆区破坏和节点区破坏两种破坏形态，随着压杆腹筋配筋率增大，破坏形态逐渐由压杆区破坏向节点区破坏转化，且斜压杆压应力扩散范围逐渐减小；斜压杆试件高厚比减小，试件混凝土有效抗压强度系数增大，尺寸效应明显；基于拉-压杆模型的规范和****提出的斜压杆承载力计算模型结果与试验结果相比较为保守． |
| 英文摘要: |
| Eleven inclined strut isolation specimens in the deep flexural members were tested for their axial compression behavior. The members were made of lightweight aggregate concrete with different parameters. The failure process, load displacement curves, failure mode and the strain of reinforced concrete were studied systematically. The influence of reinforcement ratio of web reinforcement, height thickness ratio of strut on the efficient compression strength coefficient and failure mode was deeply analyzed. The feasibility and accuracy of strut and tie model from EC2 code, ACI 318 19 code and Model Code 2010, and inclined strut bearing calculation model proposed by researchers were tested. The calculation results show that there are two typical failure patterns for inclined strut isolation specimen in lightweight aggregate concrete deep flexural member, that is, the tensile failure and concrete crushing at node failure. It is shown that with the increase of reinforcement ratio of strut web reinforcement, the failure modes change gradually from the tensile failure to concrete crushing at node failure, and the spread scope of the inclined strut compressive stresses decreases gradually. With the decrease of strut height thickness ratio, the efficient compression strength coefficient of specimens concrete increases significantly and the size effect of inclined strut is significant. The calculation results using the strut and tie model from codes and the inclined strut bearing calculation model proposed by researchers are more conservative while compared to the results of test. |
| 查看全文查看/发表评论下载PDF阅读器 |
| --> | 关闭 |
优惠券领取后72小时内有效，10万种最新考研考试考证类电子打印资料任你选。涵盖全国500余所院校考研专业课、200多种职业资格考试、1100多种经典教材，产品类型包含电子书、题库、全套资料以及视频，无论您是考研复习、考证刷题，还是考前冲刺等，不同类型的产品可满足您学习上的不同需求。 ...考试优惠券 本站小编 Free壹佰分学习网 2022-09-19