三排孔砌块在绍兴市的发展与普及

绍兴是我国混凝土小型空心砌块(以下简称砌块)的发源地之一,砌块的应用始于80年代初,盛于90年代初.20年间,共建成砌块建筑小区30余个,砌块建筑面积逾240万平方米,绍兴的砌块建筑也因此而受到了全国砌块建筑界的关注.     

砌块产品和砌块建筑必须中国化

砌块产品与砌块建筑是工业化时代的产物,现已成为当今的主要墙体材料产品。我国砌块的主要墙体材料产品。我国砌块的生产与应用起步于70年代,经过30多年的探索和实践,积累了许多经验,为砌块产品成为我国墙体材料的主导产品奠定了基础。但是,我们应该明确,砌块产品和砌块建筑必须充分树立“中国化”的理念,因为只有这样,砌块产品和砌块建筑才能在我国真正扎下根来,才能为建筑市场所接受。砌块产品和砌块建筑的“中国化”必须从以下几个方面着手。     

多排孔封底砌块用于混合结构建筑的研究与实践

本文介绍连云港地区小型混凝土砌块应用工程实例，通过改进砌块构造，采用多排孔封底砌块，配合必要的结构措施，有效地克服了混凝土砌块“热、裂、漏”的问题，对小型混凝土砌块的推广应用起到了较好的促进作用。     

三排盲孔混凝土空心砌块的生产和应用

根据广西梧州市混凝土空心砌块的生产应用情况,研制了三排盲孔混凝土小型空心砌块,该产品可通过插入聚苯板满足夏热冬暖地区居住建筑的节能标准要求;分析了该砌块性能优、造价省、施工方便等特点,并提出配套的设计、施工措施.     

Double-angle shear connections with small hollow structural section columns

This paper describes an experimental study on double-angle shear connections when used with small-size hollow structural section columns. Twelve connection specimens were tested to confirm the practice of either fitting the connection angles to the narrow column face by shortening the outstanding legs or by employing flare bevel groove welds. Test results demonstrated that both rotational and shear resistances of the connections were satisfactory when either of the two details was used. In the meantime, the flare bevel groove welds, made by a gas metal arc welding process, were also tested for the purpose of determining their effective throat.     

新型空心砌块的节能性和经济性探讨

采用实验兼理论的方法．对一新型空心砌块热工性能进行检测．根据检测结果对单块空心砌块和用该砌块砌成的一面墙进行分析比较,分析新型墙体材料的节能性指标及节能途径。     

构造措施对混凝土小型空心砌块墙体开裂的影响

通过对采用2种构造措施和未来构造措施的混凝土小型空心砌块单片墙体进行的对比试验,了解到具有不同构造措施的墙体初始裂缝的开展部位,裂缝形态,发展规律和墙体破坏形态,确定了不同构造措施墙体的抗裂荷载和极限荷载,明确了芯柱和构造柱在提高混凝土小型空心砌块墙体的抗裂荷载和极限荷载方面的作用,为确保混凝土小型空心砌块墙体的抗裂效果提供了理论依据。     

对不同强度等级混凝土梁柱节点区的探讨

对不同强度等级混凝土梁柱节点区施工常见的问题进行了分析,并结合工程实例,介绍了不同强度等级混凝土梁柱节点的特殊施工工艺,并对比了其经济效益,得出了一些有价值的结论。     

Strength and ductility of stiffened thin-walled hollow steel structural stub columns filled with concrete

It is generally expected that inner-welded longitudinal stiffeners can be used to improve the structural performance of thin-walled hollow steel structural stub columns filled with concrete. Thirty-six specimens, including 30 stiffened stub columns and six unstiffened ones, were tested to investigate the improvement of ductile behaviour of such stiffened composite stub columns with various methods. The involved methods include increasing stiffener height, increasing stiffener number on each tube face, using saw-shaped stiffeners, welding binding or anchor bars on stiffeners, and adding steel fibres to concrete. It has been found that adding steel fibres to concrete is the most effective method in enhancing the ductility capacity, while the construction cost and difficulty will not be increased significantly.     

混凝土小型空心砌块苯板保温复合墙体施工

本文通过大庆市东湖小区 20多万平方米住宅施工实践,详细介绍了混凝土小型空心砌块苯板保温复合墙体的施工工艺。     

中小跨空心板梁桥结构状态评估

针对单跨16m新沿江管桥空心板梁出现的较多裂缝病害，建立了ANSYS模型，对该桥首先进行了理论分析，然后进行了全面的普查并做了静力试验，根据新沿江管桥的理论计算、普查情况和静载试验结果表明该桥具有足够的强度和刚度，以保证行车安全。     

Tests and calculations for hollow structural steel (HSS) stub columns filled with self-consolidating concrete (SCC)

The behaviour of self-consolidating concrete (SCC) filled hollow structural steel (HSS) stub columns subjected to an axial load was investigated experimentally. A total of 50 specimens were tested. The main parameters varied in the tests are: (1) sectional types: circular and square; (2) steel yielding strength: from 282 to 404 MPa; and (3) tube diameter or width to wall thickness ratio (D/t or B/t): from 30 to 134.A mechanics model is developed in this paper for concrete-filled HSS stub columns. A unified theory is described whereby a confinement factor (ξ) is introduced to describe the composite action of the steel tube and the filled concrete. The predicted load versus deformation relationship was in good agreement with test results. The theoretical model was used to investigate the influence of important parameters that determine the ultimate strength of the composite columns. The parametric and experimental studies provide information for the development of formulae for the calculation of the ultimate strength and the axial load versus axial strain curves of the composite columns. Comparisons are made with predicted stub column strengths using the existing codes, such as ACI-1999, AISC-LRFD-1999, AIJ-1997, BS5400-1979 and EC4-1994.     

构造柱约束的混凝土小砌块墙体抗震性能的试验研究

通过对4片不同构造形式的混凝土小砌块足尺墙片在低周反复荷载作用下的恢复力试验,观测墙体在荷载作用下开裂和破坏的发展过程,研究了不同构造措施和不同结构类型的墙体的破坏形态、钢筋应变及墙体变形能力,得到墙体的开裂荷载和极限荷载。试验表明:墙体的开裂位移非常小,即使墙体能承受较大的水平荷载也很容易开裂;构造柱约束小砌块墙体能有效地提高墙体的承载力和抗震性能,增强变形能力,防止开洞墙体的脆性破坏;加水平钢丝网片和配筋带可以进一步提高墙体的延性。试验还表明墙体在开洞后极限承载力下降较多,需要有相应的加强措施,以提高其延性和抗震能力。