房建材料及制品_2021_《混凝土與水泥制品》雜志社

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房建材料及制品

新型EPS模塊澆筑墻體受壓性能試驗研究

宋珊珊，李倩茹，徐曉，郝文秀，于萬里

2021年第8期

摘要

引用本文

摘 ? 要：通過對4片新型EPS模塊澆筑墻體進行軸心和偏心受壓試驗，研究了試件的破壞形態、極限承載力和變形規律。在試驗基礎上，利用ABAQUS軟件建立了新型EPS模塊澆筑墻體有限元模型，并對試件的極限承載力進行了對比分析。結果表明：新型EPS模塊內存在連接橋，墻體的破壞首先出現在連接橋處，最終破壞形式為受壓區混凝土破壞；隨著偏心距逐漸增大，墻體的極限承載力明顯降低，應變與普通混凝土墻體的變化相似；有限元分析結果與試驗結果吻合良好，可為工程設計提供分析方法和理論依據。 Abstract: Four new EPS module cast-in-place walls were tested under axial compression and eccentric compression, ?and the failure mode, ultimate bearing capacity and deformation law of the specimens were studied. On the basis of the test, the finite element model of new EPS cast-in-place wall was established by using ABAQUS software, and the ultimate bearing capacity of the specimen was compared and analyzed. The results show that there is a connecting bridge in the new EPS module, and the wall failure first appears at the connecting bridge, and the final failure mode is concrete failure in the compression zone. With the increase of the eccentricity, the ultimate bearing capacity of the wall decreases obviously, and the change of the concrete strain is similar to that of the ordinary concrete wall. The results of finite element analysis are in good agreement with the test results, which can provide analysis method and theoretical basis for engineering design.

宋珊珊,李倩茹,徐曉,等.新型EPS模塊澆筑墻體受壓性能試驗研究[J].混凝土與水泥制品,2021(8):64-68. SONG S?S,LI Q?R,XU X,et al.Experimental Study on Compression Performance of New EPS Module Walls[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):64-68.

全FRP筋增強混凝土梁抗剪性能綜述

呂家美1，邸博2，何立杰2，黃柳超2

2021年第8期

摘要

引用本文

摘 ? 要：鋼筋銹蝕導致混凝土結構性能下降，使用壽命縮短。纖維增強復合（FRP）筋具有高抗拉強度和優異的耐腐蝕性能，在部分結構中可代替鋼筋，以提升混凝土結構的耐久性。將FRP筋應用于混凝土結構中是未來發展的重要方向，但目前關于其抗剪性能及抗剪機理尚未闡述清楚。本文對國內外關于FRP筋混凝土梁的抗剪性能研究進行了總結與分析。 Abstract: The corrosion of steel bar leads to the deterioration of the performance and the shortening of the service life of concrete structures. Fiber reinforced polymer(FRP) bars have high tensile strength and excellent corrosion resistance, and can replace steel bars in some structures to improve the durability of concrete structures. The application of FRP bars in concrete structures is an important development direction in the future. However, the shear behavior and shear mechanism of FRP reinforced concrete beams have not been explained clearly. Therefore, the research on shear behavior of FRP reinforced concrete beams at home and abroad is summarized and analyzed.

呂家美,邸博,何立杰,等.全FRP筋增強混凝土梁抗剪性能綜述[J].混凝土與水泥制品,2021(8):69-73. LYU J M,DI B,HE L J,et al.Review on Shear Behavior of Concrete Beams Strengthened with FRP Bars and Stirrups[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):69-73.

基于LS-DYNA的鋼筋混凝土梁落錘沖擊響應分析

廖俊智，何勇

2021年第8期

摘要

引用本文

摘 ? 要：基于LS-DYNA顯示動力分析程序，對3種不同配筋梁的沖擊試驗進行了數值模擬，通過參數分析探究了不同落錘高度下系統總能和各部件能量在整個沖擊過程中的變化規律以及不同時間下剪應力沿梁長的分布情況。結果表明：隨著落錘高度增加，落錘動能與梁體內能交換會出現滯后現象，落錘高度對梁體內各部件的耗能比例沒有顯著影響，沖擊過程中慣性效應不明顯；通過分析梁體內的剪應力分布情況，揭示了梁體在沖擊過程中剪應力的傳播規律和落錘高度對梁體抗剪性能的影響。 Abstract: The impact tests of three different reinforced beams were simulated based on the LS-DYNA explicit dynamic analysis program, and the change law of the total energy of the system and the energy of each component during the entire impact process under different drop weight heights and the distribution of shear stress along the beam length at different times were studied through parameter analysis. The results show that with the increase of the drop weight height, the kinetic energy of the falling weight and the energy in the beam body show a hysteresis phenomenon, and the drop weight height has no significant effect on the energy consumption ratio of various components in the beam body, and the inertial effect is not obvious during the impact process. The effects of the shear stress propagation law and the drop weight height on the shear resistance of the beam during the impact process are revealed by analyzing the distribution of shear stress.

廖俊智,何勇.基于LS-DYNA的鋼筋混凝土梁落錘沖擊響應分析全FRP筋增強混凝土梁抗剪性能綜述[J].混凝土與水泥制品,2021(8):74-78. LIAO J Z,HE Y.Analysis of Impact Response of Reinforced Concrete Beams Based on LS-DYNA[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):74-78.

耳板式空腹桁架免支撐疊合板抗彎性能試驗研究

張旭1，陳強1，龐祖杰2，孔瀟1，梁藝2，王少杰1，胡兆文2

2021年第8期

摘要

引用本文

摘 ? 要：通過標準砝碼重物加載方法，研究了耳板式空腹桁架免支撐疊合板未澆筑后澆混凝土層、澆筑后澆混凝土層之后且上部鋼管未拆除和拆除上部鋼管三個施工受力階段的抗彎性能，明晰了疊合板在各施工受力階段的工作機制與設計計算方法。結果表明：耳板式空腹桁架免支撐疊合板在施工受力各階段均具有良好的抵抗開裂與變形的能力，上部鋼管、后澆混凝土層均可顯著提高混凝土疊合底板的抗彎剛度。研究成果可為減少或免除普通混凝土疊合底板豎向支撐的使用，提高其抗裂性能提供有效路徑。 Abstract: Through the loading method of standard weights, the flexural performance of the ear plate vierendeel truss composite slab without support in three construction stress stages of the post-cast concrete layer without pouring, the post-cast concrete layer after pouring and the upper steel tube without removing and the upper steel tube is removed were studied, and the working mechanism and design calculation method of the composite slab in each construction stress stage were clarified. The results show that the ear plate vierendeel truss composite slabs without support have good resistance to cracking and deformation at all construction stages, both the upper steel tube and post-cast concrete layer can significantly improve the flexural stiffness of concrete composite slabs. The research results can provide one of the effective ways for reducing or eliminating the use of vertical bracing of common concrete composite slab and improve its crack resistance.

張旭,陳強,龐祖杰,等.耳板式空腹桁架免支撐疊合板抗彎性能試驗研究[J].混凝土與水泥制品,2021(8):79-82,95. ZHANG X,CHEN Q,PANG Z J,et al.Experimental Study on Flexural Performance of Ear Plate Vierendeel Truss Composite Slab Without Support[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(8):79-82,95.

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