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玻璃表现出极高的抗压强度和优良的耐久性,但是它固有的脆性却严重制约了其在结构中的应用。为了增大玻璃的表观延性,一种新的玻璃砌体被构思出来。在该砌体中,“砌块”由叠层或整块的浮法玻璃板制成,并通过由环氧树脂构成的“砂浆”连接起来。分别在该玻璃砌体试件及干连接玻璃试件上进行了单轴抗压试验,结果表明玻璃砌体试件的抗压强度约为干连接玻璃试件相应值的一半,但是其延性却提高了一个数量级,表现出明显的应变软化现象。在玻璃砌体试件单轴抗压试验的后临界响应中,填充在砌块间隙缝中的环氧树脂接缝所提供的侧向应力发挥了关键作用。在跨越意大利威尼斯著名大运河的一座50m跨径无铰人行拱桥的方案设计中,上述玻璃砌体材料所表现出的可观抗压强度及延性得到了应用。研究表明,至少从理论上来看,建造中小跨径的玻璃砌体人行拱桥是可行的。
Glass exhibits high compressive strength and excellent durability, but its inherent brittleness severely restricts its application to the structure. In order to increase the apparent ductility of glass, a new glass masonry was conceived. In this masonry, the “block” is made of laminated or monolithic float glass plates and joined by a “mortar” made of epoxy resin. The uniaxial compression tests were carried out on the glass masonry specimens and the dry-bonded glass specimens, respectively. The results show that the compressive strength of the glass masonry specimens is about half that of the dry-bonded glass specimens, but the ductility Increased by an order of magnitude, showing obvious strain softening phenomenon. In the post-critical response of the uniaxial compression test of glass masonry specimens, the lateral stress provided by the epoxy seams filled in the gaps between the masonry blocks plays a key role. The considerable compressive strength and ductility exhibited by the above-mentioned glass masonry materials have been applied in the design of a 50m-span non-hinge pedestrian arch bridge that spans the famous Grand Canal in Venice, Italy. Research shows that, at least in theory, the construction of small-span glass brick pavement bridge is feasible.