套筒连接预制拼装桥墩直剪性能试验研究

Experimental Study of Direct Shear Performance of Precast Segmental Bridge Piers with Splice Sleeve

摘要:

为探究套筒连接预制拼装桥墩的直剪性能和影响因素，对拼接面增设剪力键、不同套筒位置的预制拼装桥墩试件进行直剪试验。分析不同拼接缝构造桥墩的损伤发展、破坏模式，探讨预制拼装桥墩的抗剪机理并将实测值与既有抗剪公式计算结果进行比较。结果表明：矮桥墩直剪试验有2种破坏模式，即以斜裂缝开展为主的破坏和以拼接缝滑移为主的破坏；套筒设置在桥墩底部会改变桥墩的破坏模式，使得试件破坏以拼接缝滑移为主；GB50010―2010中的抗剪公式可以较合理地预测套筒连接预制拼装桥墩的抗剪强度。

关键词:预制拼装桥墩;直剪性能;灌浆套筒;直剪试验

Abstract:

In order to study the influencing factors and direct shear performance of precast segmental bridge piers with splice sleeve， direct shear tests were conducted on precast segmental bridge piers with additional shear keys and different splice sleeve position. Then， the damage development and failure mode of models were analyzed. Finally， the shear mechanism of precast segmental bridge piers was discussed and the test results was compared with the calculated results of the existing shear formula. The results show that there are two failure modes in the direct shear test of low piers， namely， the failure mainly due to the development of diagonal cracks and the failure mainly due to the slippage of the splicing joint； the setting of the sleeve at the bottom of the pier will change the failure mode of the pier. As a result， the failure of the specimen is dominated by the slip of the splicing joint； the shear formula in GB50010―2010 can reasonably predict the shear strength of the precast segmental bridge piers with splice sleeve.

Key words:precast segmental bridge piers;direct shear performance;grouted splice sleeve;direct shear test