高强钢筋高强混凝土柱抗震性能尺寸效应研究

With the rapid development of construction industry, the size of columns is more and more big although the high strength reinforced and high strength concrete is widely used in structure. The formulas in code on seismic performance of high strength reinforced and high strength concrete columns are based on the test data of small size specimens, so the method of extrapolation is used for the design of large size specimens, which has not been verified whether the results can be used in modern high-rise structures. This project with high strength reinforced and high strength concrete columns as the research object, on seismic behavior of size effect as the main line, different sectional dimensions, especially large size high strength reinforced and high strength concrete columns are tested, which get the change rule of seismic behavior on high strength reinforced and high strength concrete columns with the section size. restoring force model and Park-Ang damage model considering the size effect are established based on Bazant size effect theory. The numerical model is established combined with finite element analysis, the damage rule of larger cross section size component is explored, the size effect on seismic behavior index of high strength reinforced and high strength concrete columns is given, the results can provide the support of theory and test data for modified code.

随着建筑业的飞速发展，虽然高强钢筋和高强混凝土广泛应用于结构中，但柱子的尺寸仍越来越大。现行规范中高强钢筋高强混凝土柱抗震性能的计算公式都是基于小尺寸试件试验结果的总结，对于大尺寸试件的设计只能采用外推的方式进行预测，而这些结果对现代高层结构中的大尺寸构件是否适用还没有得到验证。本项目以高强钢筋高强混凝土柱为研究对象，以抗震性能尺寸效应为主线，进行不同截面尺寸特别是大尺寸高强钢筋高强混凝土柱的抗震性能试验，得到高强钢筋高强混凝土柱抗震性能随截面尺寸的变化规律。基于Bazant尺寸效应理论，建立考虑尺寸效应的恢复力模型和Park-Ang损伤模型，结合有限元分析建立数值模型，探索更大截面尺寸构件的破坏规律，给出考虑尺寸效应的高强钢筋高强混凝土柱抗震性能指标。所得到的高强钢筋高强混凝土柱抗震性能随截面尺寸的变化规律将为规范的修订提供参考依据。

在工程结构中，柱分为长柱及短柱，长柱多数以弯曲破坏为主，短柱以弯剪及剪切破坏为主。本课题针对高强钢筋高强混凝土柱进行了抗震性能的试验研究和理论分析，主要研究内容和结果如下：1.完成了单调水平荷载作用下的高强钢筋混凝土柱受弯性能的尺寸效应试验研究；2.完成了往复水平荷载作用下的高强钢筋混凝土柱受弯性能的尺寸效应试验研究；3.完成了往复水平荷载作用下的高强钢筋混凝土柱弯剪性能的尺寸效应试验研究；4.完成了往复水平荷载作用下的高强钢筋混凝土柱受剪性能的尺寸效应试验研究。研究结果表明：高强钢筋混凝土柱的抗弯承载力、抗剪承载力、延性及抗震性能都随截面尺寸的增加而减小，存在明显的尺寸效应。所得到的高强钢筋高强混凝土柱抗震性能随截面尺寸的变化规律将为规范的修订提供参考依据。