高強鋼絞線網加固混凝土粘結性能試驗研究

毛榮一+羅征+王銀輝+胡曉佳

摘要：通過高強鋼絞線網聚合物砂漿加固層與混凝土結構的剝離破壞試驗，對加固層與混凝土界面的剝離破壞特征進行了研究。探討了單側加固、植筋加固及U型加固等不同的加固方式對加固層抗剪承載力及抗剪強度的影響。試驗結果表明，采用U型加固等增加粘結面積的方式能有效提高加固層粘結面抗剪承載力，但同時會削弱加固層的抗剪強度，而在界面上植入抗剪鋼筋后，能同時提高聚合物砂漿加固層的抗剪承載力及抗剪強度。根據試驗結果，提出了最小植筋率的建議值。

關鍵詞：高強鋼絞線網；聚合物砂漿；鋼筋混凝土結構；加固

中圖分類號：TU375.1文獻標志碼：A文章編號：16744764（2017）02001307

Abstract：Experimental research on debonding failure of concert structure with high strength steel wire mesh was conducted to investigate the failure characteristics of interface debonding between concrete and reinforcing layer. The effects of different polymer mortar reinforcing methods were discussed on Shear bearing capacity and shear strength of reinforcing layer， such as single side strengthening、plant bar strengthening and Ushaped strengthening. The results show that shearbearing capacity can be effectively improved by means of increasing bonding area of reinforcing layer， such as Ushaped strengthening or extension length of reinforcement layer. Shear strength of reinforcing layer would be weaken at the same time. Shear strength and shearbearing capacity of polymer mortar reinforcing layer would be substantially improved by means of planting shear reinforcement. According to the test results， the suggestion value of minimum ratio of planting bar was prevised for the reference of the application in actual application.

Keywords：high steel wire mesh； polymer mortar； reinforced concrete structure； strengthening

高強鋼絞線網聚合物砂漿加固技術具有自重增加小、施工技術簡單、砂漿與混凝土之間具有良好的相容性等優點，相對其他加固方式[12]，備受加固界青睞，廣泛應用于鋼筋混凝土結構加固工程。吳剛等[3]、聶建國等[4]、郭彤等[5]對鋼絞線（預應力鋼絞線）加固梁的抗彎性能進行了實驗研究，預應力鋼絞線對加固梁的開裂荷載、剛度、屈服荷載及最大承載力等均提高明顯。Saatcioglu等[6]對預應力鋼絞線加固鋼筋混凝土柱的受剪性能進行了試驗研究，結果表明，預應力的存在能夠明顯抑制斜向裂縫的開展，有效提高試件的抗剪能力；郭俊平等[7]研發了新型預應力鋼絞線加固混凝土柱張拉錨固系統，解決了鋼絞線無法成批張拉的工程問題；黃華等[8]、廖維張等[9]對鋼絞線加固后的梁的抗震性能及墩柱的沖擊性能進行了研究。……