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首页> 外文期刊>Journal of structural engineering >Analytical Pushover Method and Hysteretic Modeling of Precast Segmental Bridge Piers with High-Strength Bars Based on Cyclic Loading Test
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Analytical Pushover Method and Hysteretic Modeling of Precast Segmental Bridge Piers with High-Strength Bars Based on Cyclic Loading Test

机译：基于循环荷载试验的高强钢筋预制分段式桥墩推力分析方法及滞回模型

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Compared to cast-in-place bridge piers, precast piers can accelerate bridge construction, but their use in seismic systems is challenging. High-strength bars (= 500 MPa) incorporated with precast piers can further expedite joint connection through reducing the quantity of conventional bars. Four large-scale pier column specimens with either high-strength (HRB600) or conventional (HRB400) bars were experimentally studied under cyclic loading. Test results showed that the precast pier with high-strength rebar shows greater lateral strength, self-centering capacity, and total energy dissipation (ED) than the one with conventional rebar. An analytical method was proposed to accurately predict the monotonic pushover behavior. The derivation of the moment-opening angle (M-theta) relationship was presented, considering the slippage between the ED bar and cementitious grout. Furthermore, a fiber-element model was established within the framework of OpenSees. Through modifying the constitutive law of unbonded ED bars near the joint interface, the bond-slip behavior can be realistically simulated. Hysteretic behaviors of precast segmental piers can be accurately captured in terms of maximum lateral force, residual drift, and energy dissipation, among others. The research can promote the application of high-strength reinforcements in the precast segmental pier. (c) 2019 American Society of Civil Engineers.
机译：与现浇桥墩相比，预制桥墩可以加快桥梁施工，但在地震系统中的使用却具有挑战性。结合预制墩的高强度钢筋（> = 500 MPa）可以通过减少常规钢筋的数量进一步加快接头连接。在循环载荷下，对四个具有高强度（HRB600）或常规（HRB400）钢筋的大型墩柱标本进行了实验研究。测试结果表明，与传统钢筋相比，具有高强度钢筋的预制墩具有更大的侧向强度，自对中能力和总能量耗散（ED）。提出了一种分析方法，可以准确地预测单调的俯冲行为。考虑到ED杆和水泥浆之间的滑动，提出了力矩张角（M-θ）关系的推导。此外，在OpenSees框架内建立了纤维元素模型。通过修改关节界面附近未结合的ED棒的本构定律，可以真实地模拟结合-滑动行为。可以根据最大横向力，残余漂移和能量耗散等准确地捕获预制分段墩的滞后行为。该研究可以促进高强度钢筋在分段分段墩中的应用。 （c）2019美国土木工程师学会。

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