基于黄金分割率模型的钢筋混凝土梁桥裂缝模式研究

Study on the Crack Pattern of RC Beam Bridge Based on Gold-division Ratio Model

从新的视角出发,引入黄金分割率来评价钢筋混凝土梁桥的裂缝分布模式。基于混凝土"单筋张拉模型"并编写程序来预测混凝土开裂后裂缝宽度和间距,结合模型实验和数值模拟验证了参数的准确性。研究结果表明:采用黄金分割率来剖析钢筋混凝土梁的裂缝分布具有深刻的物理意义,研究结果也揭示了混凝土梁裂缝间距具有尺寸效应,该方法的重要意义在于可以通过缩尺模型来预测大型桥梁的裂缝分布模式,对于评价混凝土梁桥的安全性有指导作用。

A gold-division ratio was first introduced as a new approach to evaluate the crack distribution pattern for RC beam bridge. The crack opening and space of cracked concrete was predicted by establishing a concrete ＂single rebar tension model＂ and by compiling procedures and finally the accuracy of the obtained parameters were verified by conducting model experiment and numerical simulating. The results of above study show that application of gold-division ratio in analyzing crack opening and space of cracked concrete is of profound physical significance and the research results also reveal that crack spacing of concrete beam is of size effect. The significance of this given method lies that scale model can be used to predict the crack distribution pattern of large bridges and thus provides guidance to safety assessment of concrete bridge.