鋼骨彎矩強度對SRC柱接鋼梁之梁柱接頭耐震性能影響之研究

Abstract

摘 要 本研究進行三組新型式實尺寸鋼骨鋼筋混凝土（Steel Reinforced Concrete, SRC）柱接鋼梁之梁柱接頭試體受反復載重作用之試驗，其目的在探討這種新型梁柱接頭之耐震性能與力學行為。此種梁柱接頭的主要特點在於能夠有效的利用SRC柱在勁度與抗壓能力的優點，又可以避開SRC梁施工較複雜的缺點。 依據指導教授翁正強博士所提出之研究構想與規劃，本研究主要設計參數之一為SRC柱中之鋼柱與鋼梁之彎矩強度比（Moment Strength Ratio），即 Σ(Mns)c/(Mns)b。在滿足強柱弱梁的狀況下，實驗結果顯示，在梁柱接頭區由於鋼梁受到SRC柱混凝土的圍束，可以有效的促使鋼梁於柱混凝土表面之外，發展出韌性變形所需之塑性轉角，且梁柱接頭區之混凝土並無明顯的開裂情形。本研究之初步結果證實，在適當設計下，此種SRC柱接鋼梁之構造可發揮良好的強度與韌性變形能力。 此外，本研究並嘗試在梁柱接頭區採用4支90+135度彎鉤之周邊繫筋，以形成圍束箍筋的方式，來簡化SRC梁柱接頭處箍筋的施工複雜性。實驗顯示，此種方式可以提供梁柱接頭區良好的圍束，並簡化了傳統SRC梁柱接頭處箍筋施工的複雜性。

Abstract The objective of this research is to study the seismic behavior of steel beam to SRC（Steel Reinforced Concrete）column connections through a series of cyclic loading test of full-scale specimens. The purpose of using the SRC column is to take the advantages of its larger stiffness and stronger compressive strength. The major parameter investigated in this study is the influence of the flexural strength ratio between the steel shape within in SRC column and the steel beam on the seismic behavior of the beam-column connection. A new type of hoop reinforcement in the beam-column joint is also studied. A total of three full-scaled specimens were tested in this study. All specimens were designed to meet the strong-column weak-beam requirement. The experimental results showed that the steel beams of all three specimens developed satisfactory plastic rotation capacity. The test results also suggested that the new type of hoop reinforcement in the beam-column joint can provide sufficient confinement of the concrete at the beam-column joint.