水泥混凝土制品_2022_《混凝土與水泥制品》雜志社

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水泥混凝土制品

鋼筋混凝土梁抗剪性能數值模型參數取值研究

湯婷婷1，王德才2，黃俊旗3

2022年第3期

摘要

引用本文

摘 ? 要：為提高鋼筋混凝土梁抗剪性能數值模型的精度，在已有12根不同強度、剪跨比和配箍率的鋼筋混凝土梁抗剪性能試驗基礎上，基于混凝土塑性損傷模型建立了數值模型，研究了模型網格尺寸、剪脹角以及不變量應力比對數值分析結果的影響，并對12根鋼筋混凝土梁進行了優化模擬分析。結果表明：網格尺寸的提高將降低數值模型分析所得剛度與承載力；剪脹角的增加將提高數值模型分析所得承載力，而不變量應力比對模型分析結果并無影響；基于優化參數所建立的數值模型可以較好的為鋼筋混凝土抗剪性能評估提供參考。 Abstract： In order to improve the accuracy of numerical model for the shear performance of reinforced concrete(RC) beams, numerical analysis with concrete damage plasticity was conducted based on the existing shear test of twelve RC beams with different concrete strengths, shear span-to depth ratios and stirrup ratios. The influence of mesh size, dilation angle and invariant stress ratio on the obtained analysis result was evaluated, and the optimized parameter values were obtained. Based on the optimal values, numerical analysis was conducted on the twelve RC beams to reproduce the test result. The results indicate that the increase in mesh size can reduce the obtained stiffness and load carrying capacity of the specimen; the increase in dilation angle can enhance the obtained load carrying capacity, while the shape factor has no effect on the analysis result; the numerical model based on the optimal values can be used for assessing the shear performance of the RC beams.

湯婷婷,王德才,黃俊旗.鋼筋混凝土梁抗剪性能數值模型參數取值研究[J].混凝土與水泥制品,2022(3):50-55. TANG T T,WANG D C,HUANG J Q.Value Study of Numerical Model on Shear Performance of Reinforced Concrete Beams[J].China Concrete and Cement Products,2022(3):50-55.

PK-3型板用機制砂混凝土性能試驗研究與應用

逄魯峰1,2，龐偉琪1，付鵬2，王凌3

2022年第3期

摘要

引用本文

摘 ? 要：試驗研究了不同機制砂取代率對PK-3型板用混凝土和易性、抗壓強度、劈裂抗拉強度和彈性模量影響，并對實測彈性模量進行了擬合分析。結果表明：機制砂部分或全取代河砂，改善了混凝土的和易性，提高了混凝土抗壓強度、劈裂抗拉強度和彈性模量；通過回歸分析擬合出的彈性模量函數表達式與實測數據擬合度較好；采用機制砂混凝土生產的PK-3型板施工方便、和易性較好，且強度滿足要求，脫模后無開裂現象。 Abstract: The effect of different replacement rates of mechanism sand on concrete for PK-3 type slabs was studied. And the regression analysis of measured modulus of elasticity was carried out to obtain the fitting function. The results show that the concrete properties are improved after partial or full replacement of river sand by the mechanism sand, and the compressive strength, splitting strength and elastic modulus of mechanism sand concrete are improved. The engineering application shows that the use of this mechanism sand concrete production PK-3 type plate construction is convenient, and the good compatibility and strength meet the requirements, no cracking phenomenon after demoulding.

逄魯峰,龐偉琪,付鵬,等.PK-3型板用機制砂混凝土性能試驗研究與應用[J].混凝土與水泥制品,2022(3):45-49. PANG L F,PANG W Q,FU P,et al.Experimental Study on Performance and Application of Mechanism Sand Concrete for PK-3 Slabs[J].China Concrete and Cement Products,2022(3):45-49.

預應力混凝土實心方樁抗彎性能試驗研究

陳虹霖1，陳剛2,3，徐銓彪2,3，龔順風1，劉承斌1

2022年第3期

摘要

引用本文

摘 ?要：結合足尺抗彎性能試驗，對比研究了高低預應力混凝土實心方樁在抗裂性能、抗彎承載力、變形能力、破壞形式等方面的差異。結果表明：減小張拉控制應力可以降低預應力混凝土實心方樁的抗裂性能，提高變形能力，而樁身極限抗彎承載力基本保持不變；低預應力混凝土實心方樁破壞形式為預應力鋼棒被拉斷，高預應力混凝土實心方樁破壞形式為預應力鋼棒被拉斷或受壓區混凝土被壓碎。 Abstract： Combined with the full-size flexural performance tests on the high prestressed concrete solid square piles and low prestressed concrete solid square piles, the differences in crack-resistance performance, flexural bearing capacity, deformation capacity and failure mode were comparatively studied. The results show that decreasing the tension control stress reduces cracking behavior of high prestressed concrete solid square piles, and improves deformation capacity, while the ultimate flexural bearing capacity of the piles remain basically unchanged. The failure mode of the low prestressed concrete solid square piles is that the prestressed steel bars is pulled off, and the failure mode of the high prestressed concrete solid square piles is that the prestressed steel bars is pulled off or the concrete in the compression zone is crushed.

陳虹霖,陳剛,徐銓彪,等.預應力混凝土實心方樁抗彎性能試驗研究[J].混凝土與水泥制品,2022(3):39-44. CHEN H L,CHEN G,XU Q B,et al.Experimental Study on Flexural Performance of Prestressed Concrete Solid Square Piles[J].China Concrete and Cement Products,2022(3):39-44.

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