房建材料及制品_2021_《混凝土与水泥制品》杂志社

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发布时间：2020-01-06 00:00:00

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房建材料及制品

新型预制低层装配式剪力墙抗震性能试验研究

赵阳1，王二成1,2，孔德昭3，孔德鹏3，李彦苍1,2

2021年第2期

摘要

引用本文

摘要：提出了一种适用于低层建筑的装配式剪力墙结构，并对3个足尺预制剪力墙试件进行了低周往复加载试验。结果表明：在合理范围内增加轴压比, 墙体的承载力有明显提高，两个试件都是延性破坏，延性和耗能能力均有所增强；减小剪跨比会使墙体开裂荷载和原始刚度变大，但延性变差, 水泥砂浆层出现脆性破坏。 Abstract: A prefabricated shear wall structure for low rise buildings was put forward, low cyclic loading experiments were conducted on three full-scale precast shear wall specimens. The results show that with the increase of axial pressure ratio, the bearing capacity of the low-rise precast concrete shear wall specimen can be enhanced obviously. Two walls are ductile failure and the ductility and energy consumption capacity are slightly enhanced. Reduction of shear span ratio of wall can improve the cracking performance and initial stiffness, which can obviously reduce the ductility of the wall, and the shear slip failure of the cement mortar is produced.

赵阳,王二成,孔德昭,等.新型预制低层装配式剪力墙抗震性能试验研究[J].混凝土与水泥制品,2021(2):69-73. ZHAO Y,WANG E C,KONG D Z,et al.Experimental Research on Seismic Performance of New Low-rise Precast Concrete Shear Walls[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):69-73.

双重耗能摇摆桁架-钢框架结构体系的抗震性能分析

仝强1，叶晓康1,2，常军1

2021年第2期

摘要

引用本文

摘要：为了提高结构的抗震性能，提出了一种双重耗能摇摆桁架-钢框架结构体系，即在摇摆桁架和钢框架连接处安装黏滞阻尼器，并在桁架底部设置自复位支撑（SCED）。建立了该系统的数值模型，并与摇摆桁架-钢框架对比分析，以研究其在地震下的抗震性能。结果表明：黏滞阻尼器在地震作用下充分发挥耗能能力，自复位支撑在地震作用下的残余应变基本为零，并能为结构提供足够的自复位能力，结构的抗震性能得到了很大提高。 Abstract: To improve the seismic performance of the structure, a double energy consumption rocking truss-steel frame structure system is put forward, that is, dampers are installed at the connection between the rocking truss and the steel frame, and self-centering energy dissipates (SCED) are equipped at the bottom of the truss. The numerical model of the system is established and compared with the rocking truss-steel frame to study its seismic performance. The results show that the viscous dampers fully exert its energy dissipation capacity, and the residual strain of SCED is close to zero, which can provide sufficient self-centering capability for the structure and improve structural seismic performance.

仝强,叶晓康,常军.双重耗能摇摆桁架-钢框架结构体系的抗震性能分析[J].混凝土与水泥制品,2021(2):74-78. TONG Q,YE X K,CHANG J.Seismic Performance Analysis of Double Energy Dissipation Rocking Truss-steel Frame Structure System[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):74-78.

早龄期普通混凝土直剪性能及损伤耗能分析

刘杰，吴辉琴，陈宇良，晏方

2021年第2期

摘要

引用本文

摘要：为了研究早龄期普通混凝土直剪作用下的力学性能，完成了12个普通混凝土试件的直剪试验，获取了试件的破坏形态及直剪荷载-位移全过程曲线，分析了直剪作用下龄期对普通混凝土直剪强度、峰值变形、变形模量、损伤演变、能量耗散等力学特征参数的影响规律。结果表明：龄期越长，受剪荷载-变形曲线上升段越陡峭；当龄期≤3 d时，混凝土断面剪切破坏形态为骨料与水泥基体之间界面的黏结破坏，当龄期≥7 d时，剪切破坏形态为骨料与水泥基体之间界面的黏结破坏与粗骨料本身的剪断破坏；随着龄期的延长，普通混凝土试件的峰值剪切变形减小，直剪强度、变形模量和能量耗散系数增大，混凝土损伤的出现变晚。 Abstract: In order to study the mechanical properties of ordinary concrete at early age under direct shear, a total of 12 test blocks were designed and completed for the direct shear. The failure patterns and direct shear load-displacement process curves of the specimens were obtained, and the influence rules of mechanical properties such as shear strength, peak deformation, deformation modulus, damage evolution and energy dissipation of ordinary concrete were analyzed at different ages under direct shear. The results show that the longer the age, the steeper the rising section of the shear load-deformation curve. When the age is less than or equal to 3 d, the shear failure of the concrete section is the bond failure between the aggregate and the cement matrix. When the age is greater than 7 d, the shear failure form is the bond failure of the interface between the aggregate and the cement matrix and the shear failure of the coarse aggregate. As the age increases, the peak shear deformation of the ordinary concrete specimen decreases, the shear strength, deformation modulus and energy dissipation coefficient increase, and the appearance of concrete damage becomes later.

刘杰,吴辉琴,陈宇良,等.早龄期普通混凝土直剪性能及损伤耗能分析[J].混凝土与水泥制品,2021(2):79-83. LIU J,WU H Q,CHEN Y L,et al.Analysis of Direct Shear Performance and Damage Energy Consumption of Ordinary Concrete at Early Age[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):79-83.

PVA-ECC薄板四点弯曲有限元分析

周超1，张黎飞2，刘波1，郭亚芳1

2021年第2期

摘要

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摘要：利用有限元软件建立了聚乙烯醇纤维增强超高韧性水泥基复合材料（PVA-ECC）薄板四点弯曲的有限元模型，并与已有PVA-ECC薄板四点弯曲试验进行比较，验证了有限元模型的有效性。从单元选取、材料属性定义、网格划分、接触定义、施加边界条件、荷载等方面阐述了有限元建模过程，为后续PVA-ECC有限模型的建立提供一定的参考。 Abstract: The finite element model of four point bending of polyvinyl alcohol fiber reinforced ultra-high toughness cementitious composites（PVA-ECC）thin plate is established by general finite element software. The simulation results are found to be in good agreement with test results, which indicaes that the finite element model is reasonably accurate in simulating the flexural behaviors of PVA-ECC thin plates. The finite element modeling process is described in detail from the aspects of element selection, material definition, meshing, contact definition, boundary conditions and loading, which provides a reference for the subsequent establishment of PVA-ECC finite element model.

周超,张黎飞,刘波,等.PVA-ECC薄板四点弯曲有限元分析[J].混凝土与水泥制品,2021(2):84-86. ZHOU C,ZHANG L F,LIU B,et al.Finite Element Analysis of Four Point Bending of PVA-ECC Thin Plates[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):84-86.

超低能耗预制混凝土夹心保温墙板拉结件热工性能分析

赵志刚1，吕安安2，杨思忠3，任成传1，常世涛1，董铁良1，孙波1

2021年第2期

摘要

引用本文

摘要：试验研究了保温层厚度为250 mm夹心保温墙板的热工性能。结果表明：常规保温材料厚度为250 mm时，采用不锈钢桁架或夹形和限位拉结件组合等方式，夹心保温墙板的传热系数可以达到寒冷地区超低能耗外围护墙体的要求；相比FRP拉结件，金属拉结件会产生更大的热桥效应，对预制夹心保温墙板的传热系数有较大影响；随着拉结件传热通道的增加，相近穿透率的金属拉结件对传热系数的影响增大。 Abstract: The thermal properties of 250 mm insulation layer thickness sandwich panels were studied． The results show that when the thickness of common insulation layer is 250 mm, the heat transfer coefficient of sandwich panels can meet the ultra-low energy consumption requirements of peripheral wall in cold area by using stainless steel truss or combination of clip and restraint connectors. Compared with FRP, metal connectors can produce a greater thermal bridge effect, which has a greater impact on the heat transfer coefficient of sandwich panels. With the increase of the heat transfer channel of the metal connectors, the influence of metal connectors with similar penetration rate on the heat transfer coefficient increases．

赵志刚,吕安安,杨思忠,等.超低能耗预制混凝土夹心保温墙板拉结件热工性能分析[J].混凝土与水泥制品,2021(2):87-90. ZHAO Z H,LYU A A,YANG S Z,et al.Analysis on Thermal Performance of Insulation Connectors of Ultra-low Energy Consumption Precast Concrete Sandwich Panels[J].CHINA CONCRETE AND CEMENT PRODUCTS,2021(2):87-90.

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