高性能灌浆料置换RC框架边节点高温后抗震性能

Seismic behavior of RC side joints replaced by high performance grouting material after high temperature

对C30混凝土整浇梁柱边节点和UGM高性能灌浆料置换加固梁柱边节点进行了高温试验和低周往复加载试验,对比了节点的破坏形态,分析了节点的滞回特性、承载性能、耗能能力和延性,研究了高温对两种节点抗震性能的影响规律。结果表明:在500℃范围内,随着温度的升高,C30节点和灌浆料加固节点的变形能力不断提升,承载力、耗能能力基本上呈现不断降低的趋势,延性则先提高而后降低,但仍大于常温状态下的延性系数,同时,灌浆料加固节点的抗震性能总体上优于C30节点。

High-temperature test and low-cycle reciprocating loading test were carried out on C30 concrete beam-column side joints and UGM high-performance grouting material replacement strengthened beam-column side joints.The failure modes of the joints were compared.The hysteretic characteristics,bearing capacity,energy dissipation capacity and ductility of the joints were analyzed.The influence of high temperature on the seismic behavior of the two joints was studied.The results show that,within 500℃,with the increase of temperature,the deformation capacity of C30 joints and grout-strengthened joints is constantly improved,and the bearing capacity and energy dissipation capacity are basically decreasing,while the ductility first increases and then decreases,but it is still higher than the ductility coefficient at room temperature.Meanwhile,the seismic behavior of grout-strengthened joints is better than that of C30 joints.