叠合板式综合管廊侧墙连接节点面外抗震性能试验研究

EXPERIMENTAL STUDY ON OUT-OF-PLANE SEISMIC PERFORMANCE OF SIDEWALL CONNECTIONS OF UTILITY TUNNELS WITH COMPOSITE PLATES

叠合板式综合管廊属于半装配式结构,其接缝数量少,抗渗性能优越,应用前景广泛。为了研究采用灌浆套筒连接和浆锚搭接连接两种连接方式的叠合板式综合管廊侧墙在面外荷载作用下的抗震性能,该文开展了采用两类连接方式的足尺侧墙模型的面外低周反复试验,并与管廊现浇侧墙构件作对比。通过分析试件破坏模式、裂缝分布以及受力性能指标,初步揭示了不同连接方式对叠合板式侧墙面外抗震性能的影响。研究表明:叠合板式试件与现浇试件抗震性能基本一致,滞回曲线均较饱满,极限承载力与刚度退化规律基本一致,满足装配式结构等同现浇的抗震设计要求;两类叠合板式管廊侧墙试件延性系数分别为7.05和8.50,均具有良好的面外延性,满足我国抗震设计规范中变形能力要求;采用浆锚搭接连接的叠合板式试件与采用灌浆套筒连接的叠合板式试件相比,滞回曲线更加饱满,变形能力好,但峰值抗侧承载力低,相同侧向位移下损伤破坏严重;两种连接方式的均可有效传递钢筋应力直至构件破坏。

The utility tunnel with composite plates is a semi-assembly structure,which has the advantages of fewer joints,superior impermeability and good application prospect.To investigate the seismic performance of the composite plate sidewalls of utility tunnels with grouting-sleeve connection and rebar lapping in grout-filled hole connection under out-of-plane loads,a series of low-cycle repeated tests were performed on the full-scale sidewall specimens with two types of connections in this study.The experimental results are compared with those from the cyclic tests of the cast-in-place sidewall of the utility tunnel.By investigating the failure modes,crack distributions and mechanical performance indices of differ specimens,the influence of different connections on the out-of-plane seismic performance of the composite plate sidewall is preliminarily revealed.The test results show that the seismic performance of the composite plate specimen is basically the same as that of the cast-inplace specimen.The hysteresis curves,the ultimate bearing capacity and stiffness degradation law are all similar,which meets the seismic design requirement of prefabricated structures being equivalent to cast-in-place structures.The ductility coefficients of the two types of composite plate utility tunnel sidewall specimens are 7.05 and 8.50.Both specimens exhibit excellent out-of-plane ductility and meet the deformation capacity requirements in seismic design code.Compared with the composite plate specimen connected by grouting sleeve,the hysteresis curve of the composite plate specimen connected by rebar lapping in grout-filled hole is plumper with better deformation capability,but the ultimate lateral loading bearing capacity is smaller,and the damage is more serious under the same lateral displacement.Besides,both types of connections can effectively transfer the reinforcement stress until the failure of the sidewall specimens.